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Redis

注意

本文涉及的内容过多，根据自己的需求选择阅读
由于本文不是一次性完成的，所以日志的时间可能并非按照文章的上下顺序展示，但并不影响阅读

源码安装

下载、解压

使用 curl 下载和解压使用 wget 下载和解压

shell

REDIS_VERSION=7.2.5
curl -L -o redis-$REDIS_VERSION.tar.gz https://github.com/redis/redis/archive/refs/tags/$REDIS_VERSION.tar.gz
ls -lh redis-$REDIS_VERSION.tar.gz
tar -zxvf redis-$REDIS_VERSION.tar.gz
ls -lh

shell

REDIS_VERSION=7.2.5
wget --no-check-certificate --content-disposition https://github.com/redis/redis/archive/refs/tags/$REDIS_VERSION.tar.gz
ls -lh redis-$REDIS_VERSION.tar.gz
tar -zxvf redis-$REDIS_VERSION.tar.gz
ls -lh

编译、安装

CentOS

shell

REDIS_VERSION=7.2.5
cd redis-$REDIS_VERSION
yum -y install gcc make
# 或 make
make MALLOC=libc
make install

安装结果

文件目录	说明
`/usr/local/bin/redis-server`	Redis 服务端
`/usr/local/bin/redis-cli`	Redis 客户端
`/usr/local/bin/redis-sentinel`	Redis 哨兵

测试版本

shell

redis-server --version

测试启动

注意

源码解压目录中可找到 redis.conf 文件
默认情况下，只能本地连接，无法进行远程连接

直接启动使用配置文件启动

shell

[root@k8s-1 ~]# redis-server 
1623:C 19 Sep 2024 11:26:21.854 # WARNING Memory overcommit must be enabled! Without it, a background save or replication may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
1623:C 19 Sep 2024 11:26:21.855 * oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
1623:C 19 Sep 2024 11:26:21.855 * Redis version=7.2.5, bits=64, commit=00000000, modified=0, pid=1623, just started
1623:C 19 Sep 2024 11:26:21.855 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
1623:M 19 Sep 2024 11:26:21.856 * Increased maximum number of open files to 10032 (it was originally set to 1024).
1623:M 19 Sep 2024 11:26:21.856 * monotonic clock: POSIX clock_gettime
                _._                                                  
           _.-\`\`__ ''-._                                             
      _.-\`\`    \`.  \`_.  ''-._           Redis 7.2.5 (00000000/0) 64 bit
  .-\`\` .-\`\`\`.  \`\`\`\\/    _.,_ ''-._                                  
 (    '      ,       .-\`  | \`,    )     Running in standalone mode
 |\`-._\`-...-\` __...-.\`\`-._|'\` _.-'|     Port: 6379
 |    \`-._   \`._    /     _.-'    |     PID: 1623
  \`-._    \`-._  \`-./  _.-'    _.-'                                   
 |\`-._\`-._    \`-.__.-'    _.-'_.-'|                                  
 |    \`-._\`-._        _.-'_.-'    |           https://redis.io       
  \`-._    \`-._\`-.__.-'_.-'    _.-'                                   
 |\`-._\`-._    \`-.__.-'    _.-'_.-'|                                  
 |    \`-._\`-._        _.-'_.-'    |                                  
  \`-._    \`-._\`-.__.-'_.-'    _.-'                                   
      \`-._    \`-.__.-'    _.-'                                       
          \`-._        _.-'                                           
              \`-.__.-'                                               

1623:M 19 Sep 2024 11:26:21.859 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
1623:M 19 Sep 2024 11:26:21.862 * Server initialized
1623:M 19 Sep 2024 11:26:21.862 * Ready to accept connections tcp

shell

[root@k8s-1 redis-7.2.5]# redis-server redis.conf 
1674:C 19 Sep 2024 11:33:52.116 # WARNING Memory overcommit must be enabled! Without it, a background save or replication may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
1674:C 19 Sep 2024 11:33:52.116 * oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
1674:C 19 Sep 2024 11:33:52.116 * Redis version=7.2.5, bits=64, commit=00000000, modified=0, pid=1674, just started
1674:C 19 Sep 2024 11:33:52.116 * Configuration loaded
1674:M 19 Sep 2024 11:33:52.117 * Increased maximum number of open files to 10032 (it was originally set to 1024).
1674:M 19 Sep 2024 11:33:52.117 * monotonic clock: POSIX clock_gettime
                _._                                                  
           _.-\`\`__ ''-._                                             
      _.-\`\`    \`.  \`_.  ''-._           Redis 7.2.5 (00000000/0) 64 bit
  .-\`\` .-\`\`\`.  \`\`\`\\/    _.,_ ''-._                                  
 (    '      ,       .-\`  | \`,    )     Running in standalone mode
 |\`-._\`-...-\` __...-.\`\`-._|'\` _.-'|     Port: 6379
 |    \`-._   \`._    /     _.-'    |     PID: 1674
  \`-._    \`-._  \`-./  _.-'    _.-'                                   
 |\`-._\`-._    \`-.__.-'    _.-'_.-'|                                  
 |    \`-._\`-._        _.-'_.-'    |           https://redis.io       
  \`-._    \`-._\`-.__.-'_.-'    _.-'                                   
 |\`-._\`-._    \`-.__.-'    _.-'_.-'|                                  
 |    \`-._\`-._        _.-'_.-'    |                                  
  \`-._    \`-._\`-.__.-'_.-'    _.-'                                   
      \`-._    \`-.__.-'    _.-'                                       
          \`-._        _.-'                                           
              \`-.__.-'                                               

1674:M 19 Sep 2024 11:33:52.118 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
1674:M 19 Sep 2024 11:33:52.118 * Server initialized
1674:M 19 Sep 2024 11:33:52.118 * Loading RDB produced by version 7.2.5
1674:M 19 Sep 2024 11:33:52.118 * RDB age 2 seconds
1674:M 19 Sep 2024 11:33:52.118 * RDB memory usage when created 0.91 Mb
1674:M 19 Sep 2024 11:33:52.118 * Done loading RDB, keys loaded: 1, keys expired: 0.
1674:M 19 Sep 2024 11:33:52.119 * DB loaded from disk: 0.000 seconds
1674:M 19 Sep 2024 11:33:52.119 * Ready to accept connections tcp

本地连接

shell

[root@k8s-1 redis-7.2.5]# redis-cli 
127.0.0.1:6379> set name xuxiaowei
OK
127.0.0.1:6379> get name
"xuxiaowei"
127.0.0.1:6379>

开通 Redis 端口

CentOS

shell

firewall-cmd --zone=public --add-port=6379/tcp --permanent
firewall-cmd --reload
firewall-cmd --list-all

配置 Linux 服务，管理 Redis 服务

注意

源码解压目录中可找到 redis.conf 文件
默认情况下，只能本地连接，无法进行远程连接

redis.conf 配置文件

复制源码解压目录中的 redis.conf 到指定目录，作为 Linux Service 启动 Redis 配置

shell

mkdir -p /etc/redis/
cp redis.conf /etc/redis/
ls -lh /etc/redis/

开启远程连接

shell

# 注释默认绑定本地连接
# 默认配置：bind 127.0.0.1 -::1
# 默认仅支持本地连接
sed -i 's/^bind.*/#&/' /etc/redis/redis.conf
cat /etc/redis/redis.conf | grep bind

关闭保护模式

shell

sed -i 's#protected-mode yes#protected-mode no#' /etc/redis/redis.conf
cat /etc/redis/redis.conf | grep protected-mode

设置密码

设置密码查看已设置的密码在本地 Redis 控制台内使用密码连接，推荐在本地命令行中直接使用密码连接，不推荐

shell

# 产生一个随机的16位密码
# 注意：尽量不要在 Linux 命令行中直接输入密码
REDIS_PASSWORD=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)
# 查看密码
echo $REDIS_PASSWORD
# 在文件第一行添加密码，注意：请勿多次运行，否则会出现多行密码配置
sed -i "1s/^/requirepass $REDIS_PASSWORD\\n/" /etc/redis/redis.conf

shell

cat /etc/redis/redis.conf | grep requirepass

shell

# 其中 SmTbQcOV0mXm2XLW 为 Redis 密码
[root@k8s-1 redis-7.2.5]# redis-cli
127.0.0.1:6379> AUTH SmTbQcOV0mXm2XLW
OK
127.0.0.1:6379>

shell

# 尽量不要在 Linux 命令行中直接输入密码
[root@k8s-1 redis-7.2.5]# redis-cli -a $REDIS_PASSWORD
Warning: Using a password with '-a' or '-u' option on the command line interface may not be safe.
127.0.0.1:6379>

创建 Linux Service 服务

创建 Linux Service 服务：不允许后台运行，Redis 默认配置，推荐创建 Linux Service 服务：允许后台运行

shell

sed -i 's#daemonize yes#daemonize no#' /etc/redis/redis.conf

cat /etc/redis/redis.conf | grep daemonize

cat <<EOF | tee /lib/systemd/system/redis.service
# 查看 redis 服务日志：journalctl -xefu redis
[Unit]
Description=redis
After=network.target

[Service]
ExecStart=/usr/local/bin/redis-server /etc/redis/redis.conf
ExecReload=/bin/kill -s HUP $MAINPID

[Install]
WantedBy=multi-user.target

EOF

shell

sed -i 's#daemonize no#daemonize yes#' /etc/redis/redis.conf

cat /etc/redis/redis.conf | grep daemonize

cat <<EOF | tee /lib/systemd/system/redis.service
# 查看 redis 服务日志：journalctl -xefu redis
[Unit]
Description=redis
After=network.target

[Service]
ExecStart=/usr/local/bin/redis-server /etc/redis/redis.conf
ExecReload=/bin/kill -s HUP $MAINPID
# 代表进程退出时，Linux Service 也认为服务出于正常运行
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

EOF

启动

shell

systemctl start redis.service
systemctl status redis.service --no-pager -l
systemctl enable redis.service

Redis 服务命令

注意

如果修改 /lib/systemd/system/redis.service 文件后，需要运行 systemctl daemon-reload 命令，然后再操作 Redis 服务
查看 Linux 服务状态时，可增加参数 --no-pager 关闭分页，否则需要手动退出
查看 Linux 服务状态时，可增加参数 -l 查看全部内容

命令	说明
`systemctl status redis.service`	查看 Redis 状态
`systemctl start redis.service`	启动 Redis
`systemctl stop redis.service`	停止
`systemctl restart redis.service`	重启
`systemctl enable redis.service`	打开 Redis 开启自启
`systemctl disable redis.service`	关闭 Redis 开启自启
`systemctl is-enabled redis.service`	查看 Redis 是否开启自启
`journalctl -xefu redis`	查看 Redis 服务日志

主从复制

注意

主从复制至少需要两个服务器
- 主节点 IP：192.168.80.81
- 从节点 IP：192.168.80.82
- 节点间使用内网通信
- 如果在同一台机器内操作，需要使用不同的 redis.conf，并修改下列配置，防止冲突
  - port：Redis 端口
  - pidfile：Redis pid 位置
主从复制要保持 Redis 版本一致
主从复制每个节点 Redis 安装步骤相同
- 先在任意节点完成 Redis 安装、测试
- 确认任意节点的 Redis 均能正常工作后，再进行主从复制的配置
配置主从复制时，无需调整主节点，只需要修改从节点的配置
- 对主节点无影响
- 从节点配置后，会丢失从节点的所有数据
- 从节点配置后，无法在从节点中增加、修改、删除数据，只能在主节点增加、修改、删除数据，从节点只能读取数据
主节点与从节点密码相互独立
1. 主节点的密码是否修改只影响程序连接主节点、从节点同步主节点的数据，不影响程序连接从节点
2. 从节点的密码是否修改只影响程序连接从节点，不影响从节点同步主节点的数据，不影响程序连接主节点

从节点增加主节点的地址与端口

shell

# 192.168.80.81 是主节点的地址
sed -i '1s/^/slaveof 192.168.80.81 6379\\n/' /etc/redis/redis.conf

cat /etc/redis/redis.conf | grep slaveof

从节点增加主节点的密码

注意

主节点没有密码可忽略此步骤

shell

# 尽量不要在 Linux 命令行中直接输入密码
# 实际配置请使用 vi、vim 等工具
# 其中 SmTbQcOV0mXm2XLW 为 Redis 密码
sed -i '2s/^/masterauth SmTbQcOV0mXm2XLW\\n/' /etc/redis/redis.conf

cat /etc/redis/redis.conf | grep masterauth

配置从节点的密码

注意

根据自己的需求配置，也可以与主节点密码相同

shell

# 产生一个随机的16位密码
# 注意：尽量不要在 Linux 命令行中直接输入密码
REDIS_PASSWORD=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)
# 查看密码
echo $REDIS_PASSWORD
# 在文件第一行添加密码，注意：请勿多次运行，否则会出现多行密码配置
sed -i "1s/^/requirepass $REDIS_PASSWORD\\n/" /etc/redis/redis.conf

cat /etc/redis/redis.conf | grep requirepass

重启从节点

shell

systemctl restart redis.service
systemctl status redis.service --no-pager -l

查看节点信息

查看主节点信息查看从节点信息

shell

# 其中 master_replid:8ec839af716f0256eb084f57708a60fb41cd62bb 代表主节点的ID
[root@k8s-1 ~]# redis-cli 
127.0.0.1:6379> INFO replication
# Replication
role:master
connected_slaves:1
slave0:ip=192.168.80.82,port=6379,state=online,offset=3542,lag=0
master_failover_state:no-failover
master_replid:8ec839af716f0256eb084f57708a60fb41cd62bb
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:3542
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:3542
127.0.0.1:6379>

shell

# 其中 master_replid:8ec839af716f0256eb084f57708a60fb41cd62bb 代表主节点的ID
[root@k8s-2 ~]# redis-cli
127.0.0.1:6379> INFO replication
# Replication
role:slave
master_host:192.168.80.81
master_port:6379
master_link_status:up
master_last_io_seconds_ago:9
master_sync_in_progress:0
slave_read_repl_offset:3598
slave_repl_offset:3598
slave_priority:100
slave_read_only:1
replica_announced:1
connected_slaves:0
master_failover_state:no-failover
master_replid:8ec839af716f0256eb084f57708a60fb41cd62bb
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:3598
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:15
repl_backlog_histlen:3584
127.0.0.1:6379>

查看日志

TIP

在从节点增加主节点的配置后，分别在两个节点中执行 journalctl -xefu redis 查看两个节点中 Redis 的日志，然后重启从节点，可以观察到双方的日志如下

主节点日志从节点日志

shell

# 其中 master_replid:8ec839af716f0256eb084f57708a60fb41cd62bb 代表主节点的ID
Sep 19 11:52:11 k8s-1 redis-server[1063]: 1063:M 19 Sep 2024 11:52:11.097 * Replica 192.168.80.82:6379 asks for synchronization
Sep 19 11:52:11 k8s-1 redis-server[1063]: 1063:M 19 Sep 2024 11:52:11.098 * Full resync requested by replica 192.168.80.82:6379
Sep 19 11:52:11 k8s-1 redis-server[1063]: 1063:M 19 Sep 2024 11:52:11.098 * Replication backlog created, my new replication IDs are '8ec839af716f0256eb084f57708a60fb41cd62bb' and '0000000000000000000000000000000000000000'
Sep 19 11:52:11 k8s-1 redis-server[1063]: 1063:M 19 Sep 2024 11:52:11.098 * Delay next BGSAVE for diskless SYNC
Sep 19 11:52:16 k8s-1 redis-server[1063]: 1063:M 19 Sep 2024 11:52:16.550 * Starting BGSAVE for SYNC with target: replicas sockets
Sep 19 11:52:16 k8s-1 redis-server[1063]: 1063:M 19 Sep 2024 11:52:16.553 * Background RDB transfer started by pid 1680
Sep 19 11:52:16 k8s-1 redis-server[1063]: 1680:C 19 Sep 2024 11:52:16.556 * Fork CoW for RDB: current 0 MB, peak 0 MB, average 0 MB
Sep 19 11:52:16 k8s-1 redis-server[1063]: 1063:M 19 Sep 2024 11:52:16.557 * Diskless rdb transfer, done reading from pipe, 1 replicas still up.
Sep 19 11:52:16 k8s-1 redis-server[1063]: 1063:M 19 Sep 2024 11:52:16.563 * Background RDB transfer terminated with success
Sep 19 11:52:16 k8s-1 redis-server[1063]: 1063:M 19 Sep 2024 11:52:16.563 * Streamed RDB transfer with replica 192.168.80.82:6379 succeeded (socket). Waiting for REPLCONF ACK from replica to enable streaming
Sep 19 11:52:16 k8s-1 redis-server[1063]: 1063:M 19 Sep 2024 11:52:16.563 * Synchronization with replica 192.168.80.82:6379 succeeded

shell

# 其中 master_replid:8ec839af716f0256eb084f57708a60fb41cd62bb 代表主节点的ID
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:C 19 Sep 2024 11:52:11.078 # WARNING Memory overcommit must be enabled! Without it, a background save or replication may fail under low memory condition. Being disabled, it can also cause failures without low memory condition, see https://github.com/jemalloc/jemalloc/issues/1328. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:C 19 Sep 2024 11:52:11.078 * oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:C 19 Sep 2024 11:52:11.078 * Redis version=7.2.5, bits=64, commit=00000000, modified=0, pid=1651, just started
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:C 19 Sep 2024 11:52:11.078 * Configuration loaded
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.079 * Increased maximum number of open files to 10032 (it was originally set to 1024).
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.079 * monotonic clock: POSIX clock_gettime
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.080 * Running mode=standalone, port=6379.
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.080 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.081 * Server initialized
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.081 * Loading RDB produced by version 7.2.5
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.081 * RDB age 0 seconds
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.081 * RDB memory usage when created 0.83 Mb
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.081 * Done loading RDB, keys loaded: 0, keys expired: 0.
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.081 * DB loaded from disk: 0.000 seconds
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.081 * Ready to accept connections tcp
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.081 * Connecting to MASTER 192.168.80.81:6379
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.081 * MASTER <-> REPLICA sync started
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.094 * Non blocking connect for SYNC fired the event.
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.096 * Master replied to PING, replication can continue...
Sep 19 11:52:11 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:11.097 * Partial resynchronization not possible (no cached master)
Sep 19 11:52:16 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:16.552 * Full resync from master: 8ec839af716f0256eb084f57708a60fb41cd62bb:14
Sep 19 11:52:16 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:16.558 * MASTER <-> REPLICA sync: receiving streamed RDB from master with EOF to disk
Sep 19 11:52:16 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:16.559 * MASTER <-> REPLICA sync: Flushing old data
Sep 19 11:52:16 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:16.559 * MASTER <-> REPLICA sync: Loading DB in memory
Sep 19 11:52:16 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:16.562 * Loading RDB produced by version 7.2.5
Sep 19 11:52:16 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:16.562 * RDB age 0 seconds
Sep 19 11:52:16 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:16.562 * RDB memory usage when created 1.00 Mb
Sep 19 11:52:16 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:16.562 * Done loading RDB, keys loaded: 0, keys expired: 0.
Sep 19 11:52:16 k8s-2 redis-server[1651]: 1651:S 19 Sep 2024 11:52:16.562 * MASTER <-> REPLICA sync: Finished with success

哨兵模式

注意

哨兵模式至少需要三个服务器
- 主节点：192.168.80.81
- 从节点：192.168.80.82
- 从节点：192.168.80.83
哨兵模式基于主从复制
主从复制使用的配置文件是 redis.conf，哨兵使用的配置文件是 sentinel.conf，所以哨兵模式需要两个配置文件
源码解压目录中可找到 sentinel.conf 文件
哨兵模式要保持 Redis 版本一致
哨兵模式每个节点 Redis 安装步骤相同
- 先在任意节点完成 Redis 安装、测试
- 哨兵模式部分功能基于主从复制，请先学会主从复制后再学习哨兵模式
- 确认任意节点的 Redis 均能正常工作后，再进行哨兵模式的配置
从节点配置后，无法在从节点中增加、修改、删除数据，只能在主节点增加、修改、删除数据，从节点只能读取数据
哨兵模式主节点可以进行故障转译

配置 Linux 服务，管理 Redis 服务

先让各个节点的 Redis 正常启动，并能正常远程连接，参考上方的源码安装中的 redis.service 配置

配置 Linux 服务，管理 Redis Sentinel 哨兵服务

注意

源码解压目录中可找到 sentinel.conf 文件

开通 Redis Sentinel 哨兵端口

CentOS

shell

firewall-cmd --zone=public --add-port=26379/tcp --permanent
firewall-cmd --reload
firewall-cmd --list-all

从节点增加主节点的地址与端口

shell

# 192.168.80.81 是主节点的地址，仅在从节点上添加
sed -i '1s/^/slaveof 192.168.80.81 6379\\n/' /etc/redis/redis.conf

cat /etc/redis/redis.conf | grep slaveof

主节点、从节点增加节点的密码

注意

每个节点密码保持一致
节点没有密码可忽略此步骤

shell

# 尽量不要在 Linux 命令行中直接输入密码
# 实际配置请使用 vi、vim 等工具
# 其中 SmTbQcOV0mXm2XLW 为 Redis 密码
sed -i '2s/^/masterauth SmTbQcOV0mXm2XLW\\n/' /etc/redis/redis.conf

cat /etc/redis/redis.conf | grep masterauth

重启从节点

shell

systemctl restart redis.service

sentinel.conf 配置文件

复制源码解压目录中的 sentinel.conf 到指定目录，作为 Linux Service 启动 Redis Sentinel 配置

注意

所有节点均执行

shell

mkdir -p /etc/redis/
cp sentinel.conf /etc/redis/
ls -lh /etc/redis/

从节点监控主节点

注意

仅在 从节点 上配置，主节点 不配置

shell

# 注释掉默认配置
sed -i 's/sentinel monitor mymaster 127.0.0.1 6379 2/#&/' /etc/redis/sentinel.conf

# 192.168.80.81 代表主节点地址
sed -i "1s/^/sentinel monitor mymaster 192.168.80.81 6379 2\\n/" /etc/redis/sentinel.conf

# Redis 存在密码，则需要在 哨兵中配置 Redis 的密码
# 尽量不要在 Linux 命令行中直接输入密码
# 实际配置请使用 vi、vim 等工具
# 其中 SmTbQcOV0mXm2XLW 为 Redis 密码
# sed -i '2s/^/sentinel auth-pass mymaster SmTbQcOV0mXm2XLW\\n/' /etc/redis/sentinel.conf
# cat /etc/redis/sentinel.conf | grep 'sentinel auth-pass'

cat /etc/redis/sentinel.conf | grep 'sentinel monitor'

创建 Linux Service 服务

注意

所有节点均执行

shell

cat <<EOF | tee /lib/systemd/system/redis-sentinel.service
# 查看 redis sentinel 哨兵服务日志：journalctl -xefu redis-sentinel
[Unit]
Description=redis sentinel
# 在 Redis 服务启动后再启动 Redis 哨兵服务
After=redis.service

[Service]
# 注意此处有两种用法，原理相同：https://redis.io/docs/latest/operate/oss_and_stack/management/sentinel/
# 用法一：/usr/local/bin/redis-sentinel /etc/redis/sentinel.conf
# 用法二：/usr/local/bin/redis-server /etc/redis/sentinel.conf --sentinel
ExecStart=/usr/local/bin/redis-sentinel /etc/redis/sentinel.conf
ExecReload=/bin/kill -s HUP $MAINPID

[Install]
WantedBy=multi-user.target

EOF

启动哨兵

注意

所有节点均执行
先启动主节点，再启动从节点

shell

systemctl start redis-sentinel.service
systemctl status redis-sentinel.service --no-pager -l
systemctl enable redis-sentinel.service

查看日志

TIP

启动 Redis 哨兵前，在各个节点查看哨兵的日志：journalctl -xefu redis-sentinel

主节点哨兵日志

shell

Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.435 # WARNING Memory overcommit must be enabled! Without it, a background save or replication may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.435 * oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.435 * Redis version=7.2.5, bits=64, commit=00000000, modified=0, pid=1734, just started
Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.435 * Configuration loaded
Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.437 * Increased maximum number of open files to 10032 (it was originally set to 1024).
Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.437 * monotonic clock: POSIX clock_gettime
Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.438 * Running mode=sentinel, port=26379.
Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.438 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.459 * Sentinel new configuration saved on disk
Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.459 * Sentinel ID is e0ed55a14f9f1b958b080ca5671f4af3f80bf44a
Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.459 # +monitor master mymaster 127.0.0.1 6379 quorum 2
Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.465 * +slave slave 192.168.80.83:6379 192.168.80.83 6379 @ mymaster 127.0.0.1 6379
Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.469 * Sentinel new configuration saved on disk
Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.469 * +slave slave 192.168.80.82:6379 192.168.80.82 6379 @ mymaster 127.0.0.1 6379
Sep 19 13:06:58 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:06:58.472 * Sentinel new configuration saved on disk

第一个从节点启动时第一个从节点哨兵日志

shell

Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.388 # WARNING Memory overcommit must be enabled! Without it, a background save or replication may fail under low memory condition. Being disabled, it can also cause failures without low memory condition, see https://github.com/jemalloc/jemalloc/issues/1328. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.389 * oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.389 * Redis version=7.2.5, bits=64, commit=00000000, modified=0, pid=1742, just started
Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.389 * Configuration loaded
Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.389 * Increased maximum number of open files to 10032 (it was originally set to 1024).
Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.389 * monotonic clock: POSIX clock_gettime
Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.391 * Running mode=sentinel, port=26379.
Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.391 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.395 * Sentinel new configuration saved on disk
Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.395 * Sentinel ID is c2ab7f6241f2328021858214b05f10cd5a4ad859
Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.395 # +monitor master mymaster 192.168.80.81 6379 quorum 2
Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.398 * +slave slave 192.168.80.83:6379 192.168.80.83 6379 @ mymaster 192.168.80.81 6379
Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.400 * Sentinel new configuration saved on disk
Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.400 * +slave slave 192.168.80.82:6379 192.168.80.82 6379 @ mymaster 192.168.80.81 6379
Sep 19 13:07:27 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:27.402 * Sentinel new configuration saved on disk
Sep 19 13:07:29 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:29.092 * +sentinel sentinel e0ed55a14f9f1b958b080ca5671f4af3f80bf44a 127.0.0.1 26379 @ mymaster 192.168.80.81 6379
Sep 19 13:07:29 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:29.095 * Sentinel new configuration saved on disk
Sep 19 13:07:29 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:29.095 * +sentinel-address-switch master mymaster 192.168.80.81 6379 ip 192.168.80.81 port 26379 for e0ed55a14f9f1b958b080ca5671f4af3f80bf44a
Sep 19 13:07:29 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:29.097 * Sentinel new configuration saved on disk
Sep 19 13:07:29 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:29.097 * +sentinel-address-switch master mymaster 192.168.80.81 6379 ip 127.0.0.1 port 26379 for e0ed55a14f9f1b958b080ca5671f4af3f80bf44a
Sep 19 13:07:29 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:29.099 * Sentinel new configuration saved on disk
Sep 19 13:07:31 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:31.135 * +sentinel-address-switch master mymaster 192.168.80.81 6379 ip 192.168.80.81 port 26379 for e0ed55a14f9f1b958b080ca5671f4af3f80bf44a
Sep 19 13:07:31 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:31.137 * Sentinel new configuration saved on disk
Sep 19 13:07:31 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:31.138 * +sentinel-address-switch master mymaster 192.168.80.81 6379 ip 127.0.0.1 port 26379 for e0ed55a14f9f1b958b080ca5671f4af3f80bf44a
Sep 19 13:07:31 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:07:31.140 * Sentinel new configuration saved on disk

... 重复上面四行日志

第一个从节点启动时主节点哨兵日志

shell

Sep 19 13:07:29 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:07:29.390 * +sentinel sentinel c2ab7f6241f2328021858214b05f10cd5a4ad859 192.168.80.82 26379 @ mymaster 127.0.0.1 6379
Sep 19 13:07:29 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:07:29.394 * Sentinel new configuration saved on disk

第二个从节点启动时第二个从节点哨兵日志

shell

Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.064 # WARNING Memory overcommit must be enabled! Without it, a background save or replication may fail under low memory condition. Being disabled, it can also cause failures without low memory condition, see https://github.com/jemalloc/jemalloc/issues/1328. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.064 * oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.064 * Redis version=7.2.5, bits=64, commit=00000000, modified=0, pid=1742, just started
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.064 * Configuration loaded
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.065 * Increased maximum number of open files to 10032 (it was originally set to 1024).
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.065 * monotonic clock: POSIX clock_gettime
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.066 * Running mode=sentinel, port=26379.
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.066 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.069 * Sentinel new configuration saved on disk
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.069 * Sentinel ID is 032386697444c3c8f2b300ce71bd7f376b75aa04
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.069 # +monitor master mymaster 192.168.80.81 6379 quorum 2
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.072 * +slave slave 192.168.80.83:6379 192.168.80.83 6379 @ mymaster 192.168.80.81 6379
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.075 * Sentinel new configuration saved on disk
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.075 * +slave slave 192.168.80.82:6379 192.168.80.82 6379 @ mymaster 192.168.80.81 6379
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.077 * Sentinel new configuration saved on disk
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.384 * +sentinel sentinel c2ab7f6241f2328021858214b05f10cd5a4ad859 192.168.80.82 26379 @ mymaster 192.168.80.81 6379
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.386 * Sentinel new configuration saved on disk
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.440 * +sentinel sentinel e0ed55a14f9f1b958b080ca5671f4af3f80bf44a 127.0.0.1 26379 @ mymaster 192.168.80.81 6379
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.446 * Sentinel new configuration saved on disk
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.446 * +sentinel-address-switch master mymaster 192.168.80.81 6379 ip 192.168.80.81 port 26379 for e0ed55a14f9f1b958b080ca5671f4af3f80bf44a
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.454 * Sentinel new configuration saved on disk
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.454 * +sentinel-address-switch master mymaster 192.168.80.81 6379 ip 127.0.0.1 port 26379 for e0ed55a14f9f1b958b080ca5671f4af3f80bf44a
Sep 19 13:09:24 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:24.457 * Sentinel new configuration saved on disk
Sep 19 13:09:26 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:26.494 * +sentinel-address-switch master mymaster 192.168.80.81 6379 ip 192.168.80.81 port 26379 for e0ed55a14f9f1b958b080ca5671f4af3f80bf44a
Sep 19 13:09:26 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:26.497 * Sentinel new configuration saved on disk
Sep 19 13:09:26 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:26.497 * +sentinel-address-switch master mymaster 192.168.80.81 6379 ip 127.0.0.1 port 26379 for e0ed55a14f9f1b958b080ca5671f4af3f80bf44a
Sep 19 13:09:26 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:26.500 * Sentinel new configuration saved on disk

... 重复上面四行日志

第二个从节点启动时第一个从节点哨兵日志

shell

Sep 19 13:09:26 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:26.102 * +sentinel sentinel 032386697444c3c8f2b300ce71bd7f376b75aa04 192.168.80.83 26379 @ mymaster 192.168.80.81 6379
Sep 19 13:09:26 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:09:26.106 * Sentinel new configuration saved on disk

第二个从节点启动时主节点哨兵日志

shell

Sep 19 13:09:26 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:09:26.101 * +sentinel sentinel 032386697444c3c8f2b300ce71bd7f376b75aa04 192.168.80.83 26379 @ mymaster 127.0.0.1 6379
Sep 19 13:09:26 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:09:26.105 * Sentinel new configuration saved on disk

随后主节点哨兵日志每隔一段时间输出一下从节点的信息

shell

Sep 19 13:09:59 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:09:59.300 * +fix-slave-config slave 192.168.80.82:6379 192.168.80.82 6379 @ mymaster 127.0.0.1 6379
Sep 19 13:09:59 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:09:59.426 * +fix-slave-config slave 192.168.80.83:6379 192.168.80.83 6379 @ mymaster 127.0.0.1 6379
Sep 19 13:16:06 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:16:06.441 * +fix-slave-config slave 192.168.80.83:6379 192.168.80.83 6379 @ mymaster 127.0.0.1 6379
Sep 19 13:16:07 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:16:07.000 * +fix-slave-config slave 192.168.80.82:6379 192.168.80.82 6379 @ mymaster 127.0.0.1 6379
Sep 19 13:22:09 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:22:09.623 * +fix-slave-config slave 192.168.80.83:6379 192.168.80.83 6379 @ mymaster 127.0.0.1 6379
Sep 19 13:22:09 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:22:09.623 * +fix-slave-config slave 192.168.80.82:6379 192.168.80.82 6379 @ mymaster 127.0.0.1 6379
Sep 19 13:28:11 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:28:11.819 * +fix-slave-config slave 192.168.80.83:6379 192.168.80.83 6379 @ mymaster 127.0.0.1 6379
Sep 19 13:28:12 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:28:12.875 * +fix-slave-config slave 192.168.80.82:6379 192.168.80.82 6379 @ mymaster 127.0.0.1 6379

... 省略

查看节点信息

查看主节点信息查看从节点信息查看从节点信息

shell

[root@k8s-1 redis-7.2.5]# redis-cli 
127.0.0.1:6379> INFO replication
# Replication
role:master
connected_slaves:2
slave0:ip=192.168.80.83,port=6379,state=online,offset=290842,lag=1
slave1:ip=192.168.80.82,port=6379,state=online,offset=290842,lag=1
master_failover_state:no-failover
master_replid:1daf5bf2ec9b8b01bf375e28d139af75ba064c74
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:290842
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:290842
127.0.0.1:6379>

shell

[root@k8s-2 redis-7.2.5]# redis-cli 
127.0.0.1:6379> INFO replication
# Replication
role:slave
master_host:192.168.80.81
master_port:6379
master_link_status:up
master_last_io_seconds_ago:1
master_sync_in_progress:0
slave_read_repl_offset:294591
slave_repl_offset:294591
slave_priority:100
slave_read_only:1
replica_announced:1
connected_slaves:0
master_failover_state:no-failover
master_replid:1daf5bf2ec9b8b01bf375e28d139af75ba064c74
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:294591
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:15
repl_backlog_histlen:294577
127.0.0.1:6379>

shell

[root@k8s-3 redis-7.2.5]# redis-cli 
127.0.0.1:6379> INFO replication
# Replication
role:slave
master_host:192.168.80.81
master_port:6379
master_link_status:up
master_last_io_seconds_ago:0
master_sync_in_progress:0
slave_read_repl_offset:296968
slave_repl_offset:296968
slave_priority:100
slave_read_only:1
replica_announced:1
connected_slaves:0
master_failover_state:no-failover
master_replid:1daf5bf2ec9b8b01bf375e28d139af75ba064c74
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:296968
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:15
repl_backlog_histlen:296954
127.0.0.1:6379>

Redis Sentinel 哨兵模式故障转移

停止主节点，模拟故障

shell

[root@k8s-1 redis-7.2.5]# systemctl stop redis.service 
[root@k8s-1 redis-7.2.5]# systemctl status redis.service 
● redis.service - redis
Loaded: loaded (/usr/lib/systemd/system/redis.service; enabled; vendor preset: disabled)
Active: inactive (dead) since Thu 2024-09-19 13:58:16 CST; 5min ago
Process: 1062 ExecStart=/usr/local/bin/redis-server /etc/redis/redis.conf (code=exited, status=0/SUCCESS)
Main PID: 1062 (code=exited, status=0/SUCCESS)

Sep 19 13:57:40 k8s-1 redis-server[1062]: 1062:M 19 Sep 2024 13:57:40.433 * Connection with replica 192.168.80.82:6379 lost.
Sep 19 13:58:06 k8s-1 redis-server[1062]: 1062:M 19 Sep 2024 13:58:06.633 * Connection with replica 192.168.80.83:6379 lost.
Sep 19 13:58:16 k8s-1 redis-server[1062]: 1062:signal-handler (1726725496) Received SIGTERM scheduling shutdown...
Sep 19 13:58:16 k8s-1 systemd[1]: Stopping redis...
Sep 19 13:58:16 k8s-1 redis-server[1062]: 1062:M 19 Sep 2024 13:58:16.890 * User requested shutdown...
Sep 19 13:58:16 k8s-1 redis-server[1062]: 1062:M 19 Sep 2024 13:58:16.890 * Saving the final RDB snapshot before exiting.
Sep 19 13:58:16 k8s-1 redis-server[1062]: 1062:M 19 Sep 2024 13:58:16.893 * DB saved on disk
Sep 19 13:58:16 k8s-1 redis-server[1062]: 1062:M 19 Sep 2024 13:58:16.893 * Removing the pid file.
Sep 19 13:58:16 k8s-1 redis-server[1062]: 1062:M 19 Sep 2024 13:58:16.894 # Redis is now ready to exit, bye bye...
Sep 19 13:58:16 k8s-1 systemd[1]: Stopped redis.
[root@k8s-1 redis-7.2.5]#

查看 Redis Sentinel 哨兵日志

由日志内容可知，原始主节点 192.168.80.81 6379 故障，已投票将 192.168.80.83 6379 作为新的主节点

查看 192.168.80.81 节点哨兵日志查看 192.168.80.82 节点哨兵日志查看 192.168.80.83 节点哨兵日志

shell

Sep 19 13:58:46 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:58:46.953 # +sdown master mymaster 127.0.0.1 6379
Sep 19 13:58:47 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:58:47.612 * Sentinel new configuration saved on disk
Sep 19 13:58:47 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:58:47.613 # +new-epoch 1
Sep 19 13:58:48 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:58:48.002 # +config-update-from sentinel c2ab7f6241f2328021858214b05f10cd5a4ad859 192.168.80.82 26379 @ mymaster 127.0.0.1 6379
Sep 19 13:58:48 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:58:48.002 # +switch-master mymaster 127.0.0.1 6379 192.168.80.83 6379
Sep 19 13:58:48 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:58:48.003 * +slave slave 192.168.80.82:6379 192.168.80.82 6379 @ mymaster 192.168.80.83 6379
Sep 19 13:58:48 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:58:48.003 * +slave slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 192.168.80.83 6379
Sep 19 13:58:48 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:58:48.007 * Sentinel new configuration saved on disk
Sep 19 13:59:18 k8s-1 redis-sentinel[1734]: 1734:X 19 Sep 2024 13:59:18.060 # +sdown slave 127.0.0.1:6379 127.0.0.1 6379 @ mymaster 192.168.80.83 6379

shell

Sep 19 13:58:46 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:46.993 # +sdown master mymaster 192.168.80.81 6379
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.084 # +odown master mymaster 192.168.80.81 6379 #quorum 2/2
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.084 # +new-epoch 1
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.084 # +try-failover master mymaster 192.168.80.81 6379
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.087 * Sentinel new configuration saved on disk
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.087 # +vote-for-leader c2ab7f6241f2328021858214b05f10cd5a4ad859 1
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.088 * c2ab7f6241f2328021858214b05f10cd5a4ad859 voted for c2ab7f6241f2328021858214b05f10cd5a4ad859 1
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.094 * 032386697444c3c8f2b300ce71bd7f376b75aa04 voted for c2ab7f6241f2328021858214b05f10cd5a4ad859 1
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.179 # +elected-leader master mymaster 192.168.80.81 6379
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.179 # +failover-state-select-slave master mymaster 192.168.80.81 6379
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.238 # +selected-slave slave 192.168.80.83:6379 192.168.80.83 6379 @ mymaster 192.168.80.81 6379
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.238 * +failover-state-send-slaveof-noone slave 192.168.80.83:6379 192.168.80.83 6379 @ mymaster 192.168.80.81 6379
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.315 * +failover-state-wait-promotion slave 192.168.80.83:6379 192.168.80.83 6379 @ mymaster 192.168.80.81 6379
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.980 * Sentinel new configuration saved on disk
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.980 # +promoted-slave slave 192.168.80.83:6379 192.168.80.83 6379 @ mymaster 192.168.80.81 6379
Sep 19 13:58:47 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.980 # +failover-state-reconf-slaves master mymaster 192.168.80.81 6379
Sep 19 13:58:48 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:48.001 * +slave-reconf-sent slave 192.168.80.82:6379 192.168.80.82 6379 @ mymaster 192.168.80.81 6379
Sep 19 13:58:48 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:48.635 * +slave-reconf-inprog slave 192.168.80.82:6379 192.168.80.82 6379 @ mymaster 192.168.80.81 6379
Sep 19 13:58:48 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:48.635 * +slave-reconf-done slave 192.168.80.82:6379 192.168.80.82 6379 @ mymaster 192.168.80.81 6379
Sep 19 13:58:48 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:48.698 # +failover-end master mymaster 192.168.80.81 6379
Sep 19 13:58:48 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:48.698 # +switch-master mymaster 192.168.80.81 6379 192.168.80.83 6379
Sep 19 13:58:48 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:48.698 * +slave slave 192.168.80.82:6379 192.168.80.82 6379 @ mymaster 192.168.80.83 6379
Sep 19 13:58:48 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:48.698 * +slave slave 192.168.80.81:6379 192.168.80.81 6379 @ mymaster 192.168.80.83 6379
Sep 19 13:58:48 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:48.702 * Sentinel new configuration saved on disk
Sep 19 13:59:18 k8s-2 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:59:18.752 # +sdown slave 192.168.80.81:6379 192.168.80.81 6379 @ mymaster 192.168.80.83 6379

shell

Sep 19 13:58:47 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.049 # +sdown master mymaster 192.168.80.81 6379
Sep 19 13:58:47 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.091 * Sentinel new configuration saved on disk
Sep 19 13:58:47 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.091 # +new-epoch 1
Sep 19 13:58:47 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.093 * Sentinel new configuration saved on disk
Sep 19 13:58:47 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.093 # +vote-for-leader c2ab7f6241f2328021858214b05f10cd5a4ad859 1
Sep 19 13:58:47 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.108 # +odown master mymaster 192.168.80.81 6379 #quorum 3/2
Sep 19 13:58:47 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:47.108 * Next failover delay: I will not start a failover before Thu Sep 19 14:04:47 2024
Sep 19 13:58:48 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:48.002 # +config-update-from sentinel c2ab7f6241f2328021858214b05f10cd5a4ad859 192.168.80.82 26379 @ mymaster 192.168.80.81 6379
Sep 19 13:58:48 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:48.002 # +switch-master mymaster 192.168.80.81 6379 192.168.80.83 6379
Sep 19 13:58:48 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:48.002 * +slave slave 192.168.80.82:6379 192.168.80.82 6379 @ mymaster 192.168.80.83 6379
Sep 19 13:58:48 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:48.002 * +slave slave 192.168.80.81:6379 192.168.80.81 6379 @ mymaster 192.168.80.83 6379
Sep 19 13:58:48 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:58:48.007 * Sentinel new configuration saved on disk
Sep 19 13:59:18 k8s-3 redis-sentinel[1742]: 1742:X 19 Sep 2024 13:59:18.041 # +sdown slave 192.168.80.81:6379 192.168.80.81 6379 @ mymaster 192.168.80.83 6379

查看节点信息

由日志内容可知，原始主节点 192.168.80.81 6379 故障，已投票将 192.168.80.83 6379 作为新的主节点

查看 192.168.80.81 节点信息查看 192.168.80.82 节点信息查看 192.168.80.83 节点信息

shell

[root@k8s-1 redis-7.2.5]# redis-cli 
Could not connect to Redis at 127.0.0.1:6379: Connection refused
not connected> INFO replication
Could not connect to Redis at 127.0.0.1:6379: Connection refused
not connected>

shell

[root@k8s-2 redis-7.2.5]# redis-cli 
127.0.0.1:6379> INFO replication
# Replication
role:slave
master_host:192.168.80.83
master_port:6379
master_link_status:up
master_last_io_seconds_ago:1
master_sync_in_progress:0
slave_read_repl_offset:753140
slave_repl_offset:753140
slave_priority:100
slave_read_only:1
replica_announced:1
connected_slaves:0
master_failover_state:no-failover
master_replid:cdc67aa8a83dc0e05f36d358645b6c8659ae7dff
master_replid2:1daf5bf2ec9b8b01bf375e28d139af75ba064c74
master_repl_offset:753140
second_repl_offset:611993
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:474187
repl_backlog_histlen:278954
127.0.0.1:6379>

shell

[root@k8s-3 redis-7.2.5]# redis-cli 
127.0.0.1:6379> INFO replication
# Replication
role:master
connected_slaves:1
slave0:ip=192.168.80.82,port=6379,state=online,offset=758244,lag=0
master_failover_state:no-failover
master_replid:cdc67aa8a83dc0e05f36d358645b6c8659ae7dff
master_replid2:1daf5bf2ec9b8b01bf375e28d139af75ba064c74
master_repl_offset:758526
second_repl_offset:617571
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:471957
repl_backlog_histlen:286570
127.0.0.1:6379>

节点 192.168.80.81 恢复正常后，自动加入集群，作为从节点使用

Redis Sentinel 哨兵服务命令

注意

如果修改 /lib/systemd/system/redis-sentinel.service 文件后，需要运行 systemctl daemon-reload 命令，然后再操作 Redis Sentinel 服务
查看 Linux 服务状态时，可增加参数 --no-pager 关闭分页，否则需要手动退出
查看 Linux 服务状态时，可增加参数 -l 查看全部内容

命令	说明
`systemctl status redis-sentinel.service`	查看 Redis Sentinel 状态
`systemctl start redis-sentinel.service`	启动 Redis Sentinel
`systemctl stop redis-sentinel.service`	停止
`systemctl restart redis-sentinel.service`	重启
`systemctl enable redis-sentinel.service`	打开 Redis Sentinel 开启自启
`systemctl disable redis-sentinel.service`	关闭 Redis Sentinel 开启自启
`systemctl is-enabled redis-sentinel.service`	查看 Redis Sentinel 是否开启自启
`journalctl -xefu redis-sentinel`	查看 Redis Sentinel 服务日志

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Redis ​

源码安装 ​

下载、解压 ​

编译、安装 ​

安装结果 ​

测试版本 ​

测试启动 ​

本地连接 ​

开通 Redis 端口 ​

配置 Linux 服务，管理 Redis 服务 ​

redis.conf 配置文件 ​

开启远程连接 ​

关闭保护模式 ​

设置密码 ​

创建 Linux Service 服务 ​

启动 ​

Redis 服务命令 ​

主从复制 ​

从节点增加主节点的地址与端口 ​

从节点增加主节点的密码 ​

配置从节点的密码 ​

重启从节点 ​

查看节点信息 ​

查看日志 ​

哨兵模式 ​

配置 Linux 服务，管理 Redis 服务 ​

配置 Linux 服务，管理 Redis Sentinel 哨兵服务 ​

开通 Redis Sentinel 哨兵端口 ​

从节点增加主节点的地址与端口 ​

主节点、从节点增加节点的密码 ​

重启从节点 ​

sentinel.conf 配置文件 ​

从节点监控主节点 ​

创建 Linux Service 服务 ​

启动哨兵 ​

查看日志 ​

查看节点信息 ​

Redis Sentinel 哨兵模式 故障转移 ​

Redis Sentinel 哨兵服务命令 ​

Redis

源码安装

下载、解压

编译、安装

安装结果

测试版本

测试启动

本地连接

开通 Redis 端口

配置 Linux 服务，管理 Redis 服务

redis.conf 配置文件

开启远程连接

关闭保护模式

设置密码

创建 Linux Service 服务

启动

Redis 服务命令

主从复制

从节点增加主节点的地址与端口

从节点增加主节点的密码

配置从节点的密码

重启从节点

查看节点信息

查看日志

哨兵模式

配置 Linux 服务，管理 Redis 服务

配置 Linux 服务，管理 Redis Sentinel 哨兵服务

开通 Redis Sentinel 哨兵端口

从节点增加主节点的地址与端口

主节点、从节点增加节点的密码

重启从节点

sentinel.conf 配置文件

从节点监控主节点

创建 Linux Service 服务

启动哨兵

查看日志

查看节点信息

Redis Sentinel 哨兵模式故障转移

Redis Sentinel 哨兵服务命令