一、实验环境
操作系统： CentOS7.5 Minimal
redis01 192.168.1.103
redis02 192.168.1.105
redis03 192.168.1.106
二、设置selinux和防火墙
在redis01 redis02 reids03 服务器
设置selinux为宽松模式
# setenforce 0
# sed -i 's/^SELINUX=.*/SELINUX=permissive/g' /etc/selinux/config
# sysctl -w net.core.somaxconn=1024
# echo "net.core.somaxconn = 1024" >> /etc/sysctl.conf
# sysctl -p
开放相关端口
# firewall-cmd --zone=public --add-port=6379/tcp --permanent
# firewall-cmd --zone=public --add-port=26379/tcp --permanent
# firewall-cmd --reload
安装redis依赖
# yum info jemalloc
# yum -y install jemalloc
创建redis用户
# useradd -s /sbin/nologin -d /var/lib/redis/ -c "Redis Database Server" redis
# cat /etc/passwd
创建相关服务目录
# mkdir /etc/redis
# mkdir /var/lib/redis
# mkdir /var/lib/sentinel
# mkdir /var/log/redis
三、编译安装redis
在redis01服务器
安装编译工具
# yum -y install gcc make
下载安装包
# wget http://download.redis.io/releases/redis-4.0.10.tar.gz
编译安装redis
# tar -zxf redis-4.0.10.tar.gz
# cd redis-4.0.10
# make
# make PREFIX=/usr/local/redis install
# ll /usr/local
拷贝编译安装包到 redis02 redis03服务器
# scp -r /usr/local/redis root@192.168.1.105:/usr/local
# scp -r /usr/local/redis root@192.168.1.107:/usr/local
四、安装配置redis
在redis01服务器
# cat /etc/redis/redis.conf | grep -Ev "^#|^$"
##########################################
bind 192.168.1.103
protected-mode yes
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize no
supervised no
pidfile /var/run/redis.pid
loglevel notice
logfile /var/log/redis/redis.log
databases 16
save 900 1
save 300 10
save 60 10000
stop-writes-on-bgsave-error yes
rdbcompression yes
rdbchecksum yes
dbfilename dump.rdb
dir /var/lib/redis
slave-serve-stale-data yes
slave-read-only yes
repl-diskless-sync no
repl-diskless-sync-delay 5
repl-disable-tcp-nodelay no
slave-priority 100
appendonly no
appendfilename "appendonly.aof"
appendfsync everysec
no-appendfsync-on-rewrite no
auto-aof-rewrite-percentage 100
auto-aof-rewrite-min-size 64mb
aof-load-truncated yes
lua-time-limit 5000
slowlog-log-slower-than 10000
slowlog-max-len 128
latency-monitor-threshold 0
notify-keyspace-events ""
hash-max-ziplist-entries 512
hash-max-ziplist-value 64
list-max-ziplist-size -2
list-compress-depth 0
set-max-intset-entries 512
zset-max-ziplist-entries 128
zset-max-ziplist-value 64
hll-sparse-max-bytes 3000
activerehashing yes
client-output-buffer-limit normal 0 0 0
client-output-buffer-limit slave 256mb 64mb 60
client-output-buffer-limit pubsub 32mb 8mb 60
hz 10
aof-rewrite-incremental-fsync yes
requirepass "123456"
masterauth "123456"
###################################################
在redis02 redis03服务器
# cat /etc/redis/redis.conf | grep -Ev "^#|^$"
##########################################
bind 192.168.1.103
protected-mode yes
port 6379
tcp-backlog 511
timeout 0
tcp-keepalive 300
daemonize no
supervised no
pidfile /var/run/redis.pid
loglevel notice
logfile /var/log/redis/redis.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 /var/lib/redis
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 no
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-size -2
list-compress-depth 0
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
requirepass "123456"
masterauth "123456"
slaveof 192.168.1.103 6379
###################################################
注： 多了最后一行主从的配置信息
在redis01 redis02 redis03 服务器
# vim /usr/local/redis/bin/redis-shutdown
#####################################################
#!/bin/bash
#
# Wrapper to close properly redis and sentinel
test x"$REDIS_DEBUG" != x && set -x
REDIS_CLI=/usr/local/redis/bin/redis-cli
# Retrieve service name
SERVICE_NAME="$1"
if [ -z "$SERVICE_NAME" ]; then
SERVICE_NAME=redis
fi
# Get the proper config file based on service name
CONFIG_FILE="/etc/redis/$SERVICE_NAME.conf"
# Use awk to retrieve host, port from config file
HOST=`awk '/^[[:blank:]]*bind/ { print $2 }' $CONFIG_FILE | tail -n1`
PORT=`awk '/^[[:blank:]]*port/ { print $2 }' $CONFIG_FILE | tail -n1`
PASS=`awk '/^[[:blank:]]*requirepass/ { print $2 }' $CONFIG_FILE | tail -n1`
SOCK=`awk '/^[[:blank:]]*unixsocket\s/ { print $2 }' $CONFIG_FILE | tail -n1`
# Just in case, use default host, port
HOST=${HOST:-127.0.0.1}
if [ "$SERVICE_NAME" = redis ]; then
PORT=${PORT:-6379}
else
PORT=${PORT:-26739}
fi
# Setup additional parameters
# e.g password-protected redis instances
[ -z "$PASS" ] || ADDITIONAL_PARAMS="-a $PASS"
# shutdown the service properly
if [ -e "$SOCK" ] ; then
$REDIS_CLI -s $SOCK $ADDITIONAL_PARAMS shutdown
else
$REDIS_CLI -h $HOST -p $PORT $ADDITIONAL_PARAMS shutdown
fi
##############################################################
创建redis服务器unit文件
# vim /etc/systemd/system/redis.service
################################################################
[Unit]
Description=Redis persistent key-value database
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
ExecStart=/usr/local/redis/bin/redis-server /etc/redis/redis.conf --supervised systemd
ExecStop=/usr/local/redis/bin/redis-shutdown
Type=notify
User=redis
Group=redis
RuntimeDirectory=redis
RuntimeDirectoryMode=0755
[Install]
WantedBy=multi-user.target
########################################################################
# systemctl daemon-reload
更改相关目录属主属组为redis
# chown -R redis:redis /etc/redis
# chown -R redis:redis /var/lib/redis
# chown -R redis:redis /var/lib/sentinel
# chown -R redis:redis /var/log/redis
分别启动resdis01 redis02 redis03 服务器上的redis服务
# systemctl start redis
# systemctl enable redis
# systemctl status redis
# ss -tan | grep 6379
# tail /var/log/redis/redis.log
# ps aux | grep redis-server
分别在resdis01 redis02 redis03查看redis主从信息
# redis-cli -h 192.168.1.103 -p 6379 -a "123456" info replication
# redis-cli -h 192.168.1.105 -p 6379 -a "123456" info replication
# redis-cli -h 192.168.1.106 -p 6379 -a "123456" info replication
可以看出，redis01为主，redis02 redis03 为从，1主2从的redis安装完成！
五、安装配置redis-sentinel
在resdis01 redis02 redis03服务器
创建redis配置文件
# vim /etc/redis/redis-sentinel.conf
###############################################
daemonize no
port 26379
protected-mode no
dir "/var/lib/sentinel"
sentinel monitor redis-master 192.168.1.103 6379 2
sentinel auth-pass redis-master 123456
logfile "/var/log/redis/sentinel.log"
####################################################
创建redis-sentinel Unit文件
#
############################################################
[Unit]
Description=Sentinel for Redis
After=network.target
[Service]
LimitNOFILE=64000
User=redis
Group=redis
ExecStart=/usr/local/bin/redis-sentinel /etc/redis/redis-sentinel.conf --supervised systemd
[Install]
WantedBy=multi-user.target
################################################################
# systemctl daemon-reload
更改相关目录属主属组为redis
# chown -R redis:redis /etc/redis
# chown -R redis:redis /var/lib/redis
# chown -R redis:redis /var/lib/sentinel
# chown -R redis:redis /var/log/redis
分别在resdis01 redis02 redis03服务器上启动redis-sentinel服务
# systemctl start redis-sentinel
# systemctl enable redis-sentinel
# systemctl status redis-sentinel
# tail /var/log/redis/sentinel.log
分别在resdis01 redis02 redis03服务器上查看redis和redis-sentinel进程、端口监听
# ps aux | grep redis
# ss -tan
六、测试redis-sentinel 主节点调度
现在redis主节点为redis01（192.168.1.103），我们尝试将redis01服务器关机，验证redis-sentinel 集群能否调度主节点
在redis01服务器
# reboot
在redis02服务器
# redis-cli -h 192.168.1.105 -p 6379 -a "123456" info replication
# tail /var/log/redis/sentinel.log
在redis03服务器
# redis-cli -h 192.168.1.106 -p 6379 -a "123456" info replication
# tail /var/log/redis/sentinel.log
将redis01 开机
# systemctl status redis redis-sentinel
# redis-cli -h 192.168.1.103 -p 6379 -a "123456" info replication
# tail /var/log/redis/sentinel.log
可以看到，redis01重启后，变成了从节点，redis03被推选为了主节点！
经历一次主节点的切换后，分别看看redis-sentinel 配置文件的变化
七、参考
https://www.cnblogs.com/JiangLe/p/5878160.html
sentinel.conf
http://download.redis.io/redis-stable/sentinel.conf
redis sentinel配置
https://blog.51cto.com/tianshili/1759289
redis-sentinel.service
https://github.com/Scifabric/pybossa/blob/master/contrib/redis/redis-sentinel.service
Redis自动启动脚本
https://segmentfault.com/a/1190000002488819
Redis Sentinel 启动脚本
https://www.diguage.com/archives/139.html
Redis 高可用部署方案
https://hoxis.github.io/redis-sentinel-ha.html
CentOS 7上 Redis sentinel 开启自启动设置
https://blog.yowko.com/centos7-redis-sentinel-service
Setting up Redis Sentinel as a service in Ubuntu
http://www.adfrad.com/2017/06/setting-up-redis-sentinel-as-service-in.html
redis：详解三种集群策略
https://blog.csdn.net/q649381130/article/details/79931791
redis经典三节点高可用哨兵模式集群搭建
https://blog.csdn.net/zhangcongyi420/article/details/84191873
基于Sentinel（哨兵）搭建实现Redis高可用集群
https://blog.csdn.net/pengjunlee/article/details/81429119
Redis 高可用部署方案
https://hoxis.github.io/redis-sentinel-ha.html
Redis Sentinel实现哨兵模式搭建小结
https://www.jb51.net/article/153583.htm
shell脚本一键安装redis集群
https://www.cnblogs.com/chenglee/p/10085792.html
Redis 中哨兵sentinel 机制、从宕机及恢复、主库宕机及恢复解决方案
https://blog.csdn.net/py_tamir/article/details/82555338
WARNING: The TCP backlog setting of 511.解决
https://www.cnblogs.com/faunjoe88/p/7158484.html
Redis not starting with systemctl
https://www.ringingliberty.com/2018/01/19/redis-not-starting-with-systemctl
