redis sentinel(哨兵)

作者:谢高升 发布:2019-12-03 浏览:164次

redis自带的sentinel ,可以实现多个实例的主从复制,容灾切换

下载安装使用的是redis-5.0.7

三台虚拟机

image.png

ip地址分别是 172.16.221.130 131 132   132为master


三台机器统一安装脚本,网上找的脚本改的

#!/usr/bin/env bash

function install_redis () {
#################################################################################################
        cd /usr/local/src
        if [ ! -f "redis-5.0.7.tar.gz" ]; then
           wget http://download.redis.io/releases/redis-5.0.7.tar.gz
        fi
        cd /usr/local/src
        tar -zxvf /usr/local/src/redis-5.0.7.tar.gz
        cd redis-5.0.7
        make PREFIX=/usr/local/redis install
        mkdir -p /usr/local/redis/{etc,var}
        rsync -avz redis.conf  /usr/local/redis/etc/
        sed -i 's@pidfile.*@pidfile /var/run/redis-server.pid@' /usr/local/redis/etc/redis.conf
        sed -i "s@logfile.*@logfile /usr/local/redis/var/redis.log@" /usr/local/redis/etc/redis.conf
        sed -i "s@^dir.*@dir /usr/local/redis/var@" /usr/local/redis/etc/redis.conf
        sed -i 's/daemonize no/daemonize yes/g' /usr/local/redis/etc/redis.conf
        sed -i 's/^# bind 127.0.0.1/bind 0.0.0.0/g' /usr/local/redis/etc/redis.conf
 #################################################################################################
}

install_redis

然后 chmod 777 install.sh 上传到另外两台服务器

scp install.sh root@172.16.221.131:/usr/local/src/
scp install.sh root@172.16.221.132:/usr/local/src/

分别运行 sh -x install.sh

redis启动脚本 三台机器都要

vim /etc/init.d/redis-server

#!/bin/bash
#
# redis - this script starts and stops the redis-server daemon
#
# chkconfig:   - 85 15
# description:  Redis is a persistent key-value database
# processname: redis-server
# config:      /usr/local/redis/etc/redis.conf
# config:      /etc/sysconfig/redis
# pidfile:     /usr/local/redis/var/redis-server.pid

# Source function library.
. /etc/rc.d/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network

# Check that networking is up.
[ "$NETWORKING" = "no" ] && exit 0

redis="/usr/local/redis/bin/redis-server"
prog=$(basename $redis)

REDIS_CONF_FILE="/usr/local/redis/etc/redis.conf"

[ -f /etc/sysconfig/redis ] && . /etc/sysconfig/redis

lockfile=/var/lock/subsys/redis-server

start() {
    [ -x $redis ] || exit 5
    [ -f $REDIS_CONF_FILE ] || exit 6
    echo -n $"Starting $prog: "
    daemon $redis $REDIS_CONF_FILE
    retval=$?
    echo
    [ $retval -eq 0 ] && touch $lockfile
    return $retval
}

stop() {
    echo -n $"Stopping $prog: "
    killproc $prog
    retval=$?
    echo
    [ $retval -eq 0 ] && rm -f $lockfile
    return $retval
}

restart() {
    stop
    start
}

reload() {
    echo -n $"Reloading $prog: "
    killproc $redis -HUP
    RETVAL=$?
    echo
}

force_reload() {
    restart
}

rh_status() {
    status $prog
}

rh_status_q() {
    rh_status >/dev/null 2>&1
}

case "$1" in
    start)
        rh_status_q && exit 0
        $1
        ;;
    stop)
        rh_status_q || exit 0
        $1
        ;;
    restart)
        $1
        ;;
    reload)
        rh_status_q || exit 7
        $1
        ;;
    force-reload)
        force_reload
        ;;
    status)
        rh_status
        ;;
    condrestart|try-restart)
        rh_status_q || exit 0
            ;;
    *)
        echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"
        exit 2
esac

然后给权限  chmod 777 /etc/init.d/redis-server

redis-sentinel脚本内容 

vim /etc/init.d/redis-sentinel
#!/bin/bash
#
# redis-sentinel - this script starts and stops the redis-server sentinel daemon
#
# chkconfig:   - 85 15
# description:  Redis sentinel
# processname: redis-server
# config:      /usr/local/redis/etc/sentinel.conf
# config:      /etc/sysconfig/redis
# pidfile:     /usr/local/redis/var/redis-sentinel.pid

# Source function library.
. /etc/rc.d/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network

# Check that networking is up.
[ "$NETWORKING" = "no" ] && exit 0

redis="/usr/local/redis/bin/redis-sentinel"
prog=$(basename $redis)

REDIS_CONF_FILE="/usr/local/redis/etc/sentinel.conf"

[ -f /etc/sysconfig/redis ] && . /etc/sysconfig/redis

lockfile=/var/lock/subsys/redis-sentinel

start() {
    [ -x $redis ] || exit 5
    [ -f $REDIS_CONF_FILE ] || exit 6
    echo -n $"Starting $prog: "
    daemon $redis $REDIS_CONF_FILE --sentinel
    retval=$?
    echo
    [ $retval -eq 0 ] && touch $lockfile
    return $retval
}

stop() {
    echo -n $"Stopping $prog: "
    killproc $prog
    retval=$?
    echo
    [ $retval -eq 0 ] && rm -f $lockfile
    return $retval
}

restart() {
    stop
    start
}

reload() {
    echo -n $"Reloading $prog: "
    killproc $redis -HUP
    RETVAL=$?
    echo
}

force_reload() {
    restart
}

rh_status() {
    status $prog
}

rh_status_q() {
    rh_status >/dev/null 2>&1
}

case "$1" in
    start)
        rh_status_q && exit 0
        $1
        ;;
    stop)
        rh_status_q || exit 0
        $1
        ;;
    restart)
        $1
        ;;
    reload)
        rh_status_q || exit 7
        $1
        ;;
    force-reload)
        force_reload
        ;;
    status)
        rh_status
        ;;
    condrestart|try-restart)
        rh_status_q || exit 0
            ;;
    *)
        echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"
        exit 2
esac

  配置redis.config

编辑redis-master主节点的redis.conf文件

mkdir -p /usr/local/redis/data/redis

mv /usr/local/redis/etc/redis.conf /usr/local/redis/etc/redis.conf.bak

vim /usr/local/redis/etc/redis.conf

bind 0.0.0.0
daemonize yes
pidfile "/usr/local/redis/var/redis-server.pid"
port 6379
tcp-backlog 128
timeout 0
tcp-keepalive 0
loglevel notice
logfile "/usr/local/redis/var/redis-server.log"
databases 16
save 900 1  
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir "/usr/local/redis/data/redis"
#masterauth "20180408"                        #master设置密码保护,即slave连接master时的密码
#requirepass "20180408"                       #设置Redis连接密码,如果配置了连接密码,客户端在连接Redis时需要通过AUTH <password>命令提供密码,默认关闭
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
appendonly yes                                
#打开aof持久化
appendfilename "appendonly.aof"
appendfsync everysec                          
# 每秒一次aof写
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-entries 512
list-max-ziplist-value 64
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes
编辑redis-slave01和redis-slave02两个从节点的redis.conf文件

mkdir -p /usr/local/redis/data/redis

mv  /usr/local/redis/etc/redis.conf /usr/local/redis/etc/redis.conf.bak

vim /usr/local/redis/etc/redis.conf

bind 0.0.0.0
daemonize yes
pidfile "/usr/local/redis/var/redis-server.pid"
port 6379
tcp-backlog 128
timeout 0
tcp-keepalive 0
loglevel notice
logfile "/usr/local/redis/var/redis-server.log"
databases 16
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename "dump.rdb"
dir "/usr/local/redis/data/redis"
#masterauth "20180408"
#requirepass "20180408"
replicaof 172.16.221.132 6379
#相对主redis配置,多添加了此行
replica-serve-stale-data yes
replica-read-only yes
#从节点只读,不能写入
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
replica-priority 100
appendonly yes
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-entries 512
list-max-ziplist-value 64
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit replica 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes

配置sentinel.conf(这个默认没有,需要自建)。三个节点的配置一样。

mkdir -p /usr/local/redis/data/sentinel

vim /usr/local/redis/etc/sentinel.conf

port 26379
pidfile "/usr/local/redis/var/redis-sentinel.pid"
dir "/usr/local/redis/data/sentinel"
daemonize yes
protected-mode no
logfile "/usr/local/redis/var/redis-sentinel.log"
sentinel monitor redisMaster 192.168.10.202 6379 2 
sentinel down-after-milliseconds redisMaster 10000 
sentinel parallel-syncs redisMaster 1
sentinel failover-timeout redisMaster 60000


启动redis和sentinel(三个节点都要操作)

vim /etc/profile
.......
export PATH=$PATH:/usr/local/redis/bin

然后执行  source /etc/profile

在三台服务器分别启动 
/etc/init.d/redis-server start
/etc/init.d/redis-sentinel start
redis-cli -h 172.16.221.130 -p 6379 INFO|grep role

1575339740704992.png

查看master节点

redis-cli -h 172.16.221.132 -p 6379 info Replication

image.png


如果看不到从redis的信息看看是否没有关闭防火墙 


PHP连接redis集群 先连接redis-sentinel

<?php
//初始化redis对象
$redis = new Redis();
//连接sentinel服务 host为ip,port为端口
$host = '172.16.221.132';
$port = 26379;
$redis->connect($host, $port);
$master_name ='redisMaster';
//可能用到的部分命令,其他可以去官方文档查看

//获取主库列表及其状态信息
$result = $redis->rawCommand('SENTINEL', 'masters');
//print_r($result);exit;
//根据所配置的主库redis名称获取对应的信息
//master_name应该由运维告知(也可以由上一步的信息中获取)
$result = $redis->rawCommand('SENTINEL', 'master', $master_name);

//根据所配置的主库redis名称获取其对应从库列表及其信息
$result = $redis->rawCommand('SENTINEL', 'slaves', $master_name);
//print_r($result);exit;
//获取特定名称的redis主库地址
$result = $redis->rawCommand('SENTINEL', 'get-master-addr-by-name', $master_name);
//print_r($result);exit;
//这个方法可以将以上sentinel返回的信息解析为数组
function parseArrayResult(array $data)
{
    $result = array();
    $count = count($data);
    for ($i = 0; $i < $count;) {
        $record = $data[$i];
        if (is_array($record)) {
            $result[] = parseArrayResult($record);
            $i++;
        } else {
            $result[$record] = $data[$i + 1];
            $i += 2;
        }
    }
    return $result;
}
//$result打印的是主redis的ip和端口
$redis->connect($result[0],$result[1]);
$datas = $redis->get('name');
print_r($datas);

image.png参考地址https://www.cnblogs.com/kevingrace/p/9004460.html

标签: redis-sentinel