CentOS6 单节点安装Redis Sentinel

Redis Sentinel模式简介

Redis-Sentinel是官方推荐的高可用解决方案，当redis在做master-slave的高可用方案时，假如master宕机了，redis本身（以及其很多客户端）都没有实现自动进行主备切换，而redis-sentinel本身也是独立运行的进程，可以部署在其他与redis集群可通讯的机器中监控redis集群

• 主要功能有一下几点

1、不时地监控redis是否按照预期良好地运行;
2、如果发现某个redis节点运行出现状况，能够通知另外一个进程(例如它的客户端);
3、能够进行自动切换。当一个master节点不可用时，能够选举出master的多个slave(如果有超过一个slave的话)中的一个来作为新的master,其它的slave节点会将它所追随的master的地址改为被提升为master的slave的新地址。
4、哨兵为客户端提供服务发现，客户端链接哨兵，哨兵提供当前master的地址然后提供服务，如果出现切换，也就是master挂了，哨兵会提供客户端一个新地址。

Redis Sentinel 安装

• 环境准备：

192.168.0.106 CentOS6.9

安装Redis

参考：http://blog.csdn.net/wh211212/article/details/52817923

CentOS6 单节点安装Redis Sentinel

• 下载redis

virsh attach-disk kvm-6 /dev/vg_shkvm3/kvm-6-data vdb –driver qemu –mode shareable

wget http://download.redis.io/releases/redis-3.2.8.tar.gz -P /usr/local/src

• 解压、指定目录

tar xvf redis-3.2.8.tar.gz -C /usr/local/cd /usr/local/ln -sv redis-3.2.8 redis

• 设置系统内核参数

echo 512 > /proc/sys/net/core/somaxconnsysctl vm.overcommit_memory=1

• 编译

yum groupinstall -y "Development Tools"yum -y install tcl # 安装tcl依赖防止make test报错

解决办法：

1，只用单核运行 make test：
taskset -c 1 sudo make test
2，更改 tests/integration/replication-psync.tcl 文件：
vi tests/integration/replication-psync.tcl
把对应报错的那段代码中的 after后面的数字，从100改成 500。我个人觉得，这个参数貌似是等待的毫秒数。

cd redis && make && make test

• 为多实例redis配置启动环境

mkdir -pv /data/redis-sentinel/{9000,9001,9002}cp src/{redis-server,redis-sentinel} /data/redis-sentinel/9000/cp src/{redis-server,redis-sentinel} /data/redis-sentinel/9001/cp src/{redis-server,redis-sentinel} /data/redis-sentinel/9002/cp redis.conf sentinel.conf /data/redis-sentinel/9000/cp redis.conf sentinel.conf /data/redis-sentinel/9001/cp redis.conf sentinel.conf /data/redis-sentinel/9002/

• 修改配置文件

# vim /data/redis-sentinel/9000/redis.confbind 192.168.0.106protected-mode noport 9000daemonize yesappendonly yes# \cp /data/redis-sentinel/9000/redis.conf /data/redis-sentinel/9001/redis.conf# \cp /data/redis-sentinel/9000/redis.conf /data/redis-sentinel/9002/redis.confsed -i 's/9000/9001/g' /data/redis-sentinel/9001/redis.conf# vim /data/redis-sentinel/9001/redis.confport 9001slaveof 192.168.0.106 9000# vim /data/redis-sentinel/9002/redis.confsed -i 's/9000/9002/g' /data/redis-sentinel/9002/redis.confport 9002slaveof 192.168.0.106 9000

• 啟動三個redis實例

# cd /data/redis-sentinel/9000/# ./redis-server redis.conf# cd ../9001/# ./redis-server redis.conf# cd ../9002/# ./redis-server redis.conf# ps -ef | grep redisroot      4218     1  0 17:03 ?        00:00:00 ./redis-server 192.168.0.106:9000root      4238     1  0 17:03 ?        00:00:00 ./redis-server 192.168.0.106:9001root      4252     1  0 17:03 ?        00:00:00 ./redis-server 192.168.0.106:9002

• 查看主从状态

# /usr/local/redis/src/redis-cli -h 192.168.0.106 -p 9000192.168.0.106:9000> set name aniuOK192.168.0.106:9000> get name"aniu"192.168.0.106:9000> info replication# Replication192.168.0.106:9000> info replication# Replicationrole:masterconnected_slaves:2slave0:ip=192.168.0.106,port=9001,state=online,offset=1121,lag=0slave1:ip=192.168.0.106,port=9002,state=online,offset=1121,lag=1master_repl_offset:1121repl_backlog_active:1repl_backlog_size:1048576repl_backlog_first_byte_offset:2repl_backlog_histlen:1120

部署sentinel

• 部署sentinel 1

# cd /data/redis-sentinel/9000# vim sentinel.confprotected-mode noport 29000daemonize yesdir /data/redis-sentinel/9000/logssentinel monitor mymaster 192.168.0.106 9000 2# mkdir logs# ./redis-sentinel sentinel.conf# \cp sentinel.conf ../9001/# \cp sentinel.conf ../9002/

• 部署sentinel 2

# cd ../9001/port 29001dir "/data/redis-sentinel/9001/logs"# mkdir logs# ./redis-sentinel sentinel.conf- 部署sentinel 3# cd ../9002/# vim sentinel.confport 29002dir "/data/redis-sentinel/9002/logs"# mkdir logs# ./redis-sentinel sentinel.conf

• 验证

# /usr/local/redis/src/redis-cli -h 192.168.0.106 -p 29000[root@sh-kvm-3-6 9002]# /usr/local/redis/src/redis-cli -h 192.168.0.106 -p 29000192.168.0.106:29000> sentinel masters1)  1) "name"    2) "mymaster"    3) "ip"    4) "192.168.0.106"    5) "port"    6) "9000"    7) "runid"    8) "03427a4cd4f22401f55d07952424ba4b31144b57"    9) "flags"   10) "master"   11) "link-pending-commands"   12) "0"   13) "link-refcount"   14) "1"   15) "last-ping-sent"   16) "0"   17) "last-ok-ping-reply"   18) "542"   19) "last-ping-reply"   20) "542"   21) "down-after-milliseconds"   22) "30000"   23) "info-refresh"   24) "3335"   25) "role-reported"   26) "master"   27) "role-reported-time"   28) "515500"   29) "config-epoch"   30) "0"   31) "num-slaves"   32) "2"   33) "num-other-sentinels"   34) "0"   35) "quorum"   36) "2"   37) "failover-timeout"   38) "180000"   39) "parallel-syncs"   40) "1"192.168.0.106:29000> sentinel slaves mymaster1)  1) "name"    2) "192.168.0.106:9002"    3) "ip"    4) "192.168.0.106"    5) "port"    6) "9002"    7) "runid"    8) "42ec153d250bf9aff05765346e0fdc2ee33d1257"    9) "flags"   10) "slave"   11) "link-pending-commands"   12) "0"   13) "link-refcount"   14) "1"   15) "last-ping-sent"   16) "0"   17) "last-ok-ping-reply"   18) "510"   19) "last-ping-reply"   20) "510"   21) "down-after-milliseconds"   22) "30000"   23) "info-refresh"   24) "6271"   25) "role-reported"   26) "slave"   27) "role-reported-time"   28) "548469"   29) "master-link-down-time"   30) "0"   31) "master-link-status"   32) "ok"   33) "master-host"   34) "192.168.0.106"   35) "master-port"   36) "9000"   37) "slave-priority"   38) "100"   39) "slave-repl-offset"   40) "57920"2)  1) "name"    2) "192.168.0.106:9001"    3) "ip"    4) "192.168.0.106"    5) "port"    6) "9001"    7) "runid"    8) "afdc283bae3f48fb0ceb6f8dd9af8248928406ec"    9) "flags"   10) "slave"   11) "link-pending-commands"   12) "0"   13) "link-refcount"   14) "1"   15) "last-ping-sent"   16) "0"   17) "last-ok-ping-reply"   18) "510"   19) "last-ping-reply"   20) "510"   21) "down-after-milliseconds"   22) "30000"   23) "info-refresh"   24) "6271"   25) "role-reported"   26) "slave"   27) "role-reported-time"   28) "548486"   29) "master-link-down-time"   30) "0"   31) "master-link-status"   32) "ok"   33) "master-host"   34) "192.168.0.106"   35) "master-port"   36) "9000"   37) "slave-priority"   38) "100"   39) "slave-repl-offset"   40) "57920"

jedis中使用哨兵

Redis常用安全设置

• 设置密码

requirepass yourpassword

• 禁用高危命令

rename-command FLUSHALL ""rename-command FLUSHDB ""rename-command KEYS ""