Redis 搭建高可用集群

、单个redis服务搭建请参考：redis服务搭建

 

 

2、在/usr/local下创建目录redis-cluster,并在redis-cluster下创建 6379、6380、6381目录以及data、temp目录

 

# cd /usr/local

# mkdir redis-cluster

--其他文件创建类似，此处不一一写出

3、复制安装后的redis的配置文件（我的在/etc/目录下）的redis.conf 和 sentinel.conf文件到 6379、6380、6381目录中.

 

# cp /etc/redis.conf /usr/local/redis-cluster/6379

# cp /etc/redis-sentinel.conf /usr/local/redis-cluster/6379

--6380和6379类似，此处不一一写出

4、主从配置，修改 redis.conf文件 

 

主redis 6379目录:

 

复制代码

protected-mode yes

port 6379

daemonize yes

pidfile /var/run/redis_6379.pid

logfile /var/log/redis/redis_6379.log

dir /usr/local/redis-cluster/6379/data

slave-read-only yes

requirepass foo(设置访问登录密码)

#从服务设置了密码需要加上 

masterauth foo 

复制代码

从slave1 6380:

 

复制代码

protected-mode yes

port 6380

daemonize yes

pidfile /var/run/redis_6380.pid

logfile /var/log/redis/redis_6380.log

dir /usr/local/redis-cluster/6380/data 

slaveof 127.0.0.1 6379 

#若主服务设置了密码需要加上 

masterauth foo 

#从服务密码设置 

requirepass foo

复制代码

从slave2 6381:

 

复制代码

protected-mode yes

port 6381

daemonize yes

pidfile /var/run/redis_6381.pid

logfile /var/log/redis/redis_6381.log

dir /usr/local/redis-cluster/6381/data 

slaveof 127.0.0.1 6379 

#若主服务设置了密码需要加上，在设置哨兵时主从之间连接需要

masterauth foo 

#从服务密码设置 

requirepass foo

复制代码

master既可以读,也可以写,而 从服务器是只可以读,不可写的.

 

5、哨兵配置.

 

主redis 6379 sentinel.conf

 

protected-mode no

port 26379

dir "/usr/local/redis-cluster/6379/temp"

sentinel monitor redis1 127.0.0.1 6379 2

sentinel down-after-milliseconds redis1 10000

sentinel failover-timeout redis1 60000

其中redis1可自定义

 

从slave1 6380 centinel.conf

 

protected-mode no

port 26380

dir "/usr/local/redis-cluster/6380/temp"

sentinel monitor redis1 127.0.0.1 6379 2

sentinel down-after-milliseconds redis1 10000

sentinel failover-timeout redis1 60000

从slave2 7003 sentinel.conf

 

protected-mode no

port 26381

dir "/home/redis/redis-cluster/6381/temp"

sentinel monitor redis1 127.0.0.1 6381 2

sentinel down-after-milliseconds redis1 10000

sentinel failover-timeout redis1 60000

哨兵配置完成.

 

6、启动

 

启动redis

分别到6379、6380、6381的目录下执行启动命令:

 

redis-server ./redis.conf 

 

启动哨兵

 

redis-server ./sentinel.conf 

 

7、查看主从信息:

 

复制代码

127.0.0.1:6379> info replication

# Replication

role:master

connected_slaves:2

slave0:ip=127.0.0.1,port=6380,state=online,offset=420,lag=1

slave1:ip=127.0.0.1,port=6381,state=online,offset=420,lag=1

master_repl_offset:434

repl_backlog_active:1

repl_backlog_size:1048576

repl_backlog_first_byte_offset:2

repl_backlog_histlen:433

复制代码

 

 

复制代码

127.0.0.1:6380> info replication

# Replication

role:slave

master_host:127.0.0.1

master_port:6379

master_link_status:up

master_last_io_seconds_ago:1

master_sync_in_progress:0

slave_repl_offset:168

slave_priority:100

slave_read_only:1

connected_slaves:0

master_repl_offset:0

repl_backlog_active:0

repl_backlog_size:1048576

repl_backlog_first_byte_offset:0

repl_backlog_histlen:0

复制代码

 

 

复制代码

127.0.0.1:6381> info replication

# Replication

role:slave

master_host:127.0.0.1

master_port:6379

master_link_status:up

master_last_io_seconds_ago:9

master_sync_in_progress:0

slave_repl_offset:406

slave_priority:100

slave_read_only:1

connected_slaves:0

master_repl_offset:0

repl_backlog_active:0

repl_backlog_size:1048576

repl_backlog_first_byte_offset:0

repl_backlog_histlen:0

复制代码

 

 

8、验证

 

127.0.0.1:6379> set test 123

OK

 

 

127.0.0.1:6380> get test

"123"

127.0.0.1:6380> set hh 6380

(error) READONLY You can't write against a read only slave.

 

 

127.0.0.1:6381> get test

"123"

127.0.0.1:6381> set xx 6381

(error) READONLY You can't write against a read only slave.

 

 

此时,我们可以把主服务或者从服务停掉进行测试来看看效果

 

停掉主服务6379:

 

复制代码

[root@VM_0_15_centos 6379]# ps -ef |grep redis

root 10690 30720 0 18:24 pts/4 00:00:00 tailf -n 200 /var/log/redis/sentinel.log

root 15650 1 0 19:01 ? 00:00:01 redis-sentinel *:26379 [sentinel]

root 16404 1 0 19:06 ? 00:00:00 redis-sentinel *:26381 [sentinel]

root 16565 1 0 19:07 ? 00:00:00 redis-sentinel *:26380 [sentinel]

root 17248 28933 0 19:12 pts/0 00:00:00 grep --color=auto redis

root 31060 1 0 16:55 ? 00:00:06 redis-server *:6379

root 31488 1 0 16:58 ? 00:00:06 redis-server *:6380

root 31563 29043 0 16:58 pts/1 00:00:00 redis-cli -c -p 6380 -a foo

root 31952 1 0 17:01 ? 00:00:06 redis-server *:6381

root 32057 29125 0 17:02 pts/2 00:00:00 redis-cli -c -p 6381 -a foo

[root@VM_0_15_centos 6379]# kill 31060

复制代码

sentinel日志：

复制代码

15650:X 18 Dec 19:13:44.834 # +sdown master mymaster 127.0.0.1 6379

16565:X 18 Dec 19:13:44.852 # +sdown master mymaster 127.0.0.1 6379

16404:X 18 Dec 19:13:44.861 # +sdown master mymaster 127.0.0.1 6379

16404:X 18 Dec 19:13:44.920 # +odown master mymaster 127.0.0.1 6379 #quorum 3/2

16404:X 18 Dec 19:13:44.920 # +new-epoch 1

16404:X 18 Dec 19:13:44.920 # +try-failover master mymaster 127.0.0.1 6379

16404:X 18 Dec 19:13:44.927 # +vote-for-leader 6d5a34396cd5912cbfe1134a70cd3e14338ebf24 1

15650:X 18 Dec 19:13:44.934 # +new-epoch 1

16565:X 18 Dec 19:13:44.934 # +new-epoch 1

16565:X 18 Dec 19:13:44.940 # +vote-for-leader