1.准备好4台机器
192.168.42.150 redis-node1 #主 192.168.42.151 redis-node2 #从 192.168.42.152 redis-node3 #从 192.168.42.153 redis-node4 #从
将主机解析写入hosts文件,分发至每台机器
2.安装redis,配置好基本配置
(1) 4台机器,分别安装redis
cd /usr/local/src wget http://192.168.42.26/install_package/down/redis-3.2.3-1.el7.x86_64.rpm yum install redis-3.2.3-1.el7.x86_64.rpm -y
(2) 4台机分别配置好,配置文件,做好备份
cp /etc/redis.conf{,.back}
vim redis.conf
daemonize yes
bind 192.168.42.150 #改为各个节点的IP
(3) 依照上面设定的从主机,在从主机配置文件中开启从配置(需要配置3台机器)
# slaveof <masterip> <masterport> slaveof 192.168.42.150 6379
(4) 启动redis-server(4台同时启动)
redis-server /etc/redis.conf
(5) 在主机器上登录redis
[root@redis-node1 ~]# redis-cli -h 192.168.42.150 192.168.42.150:6379> 192.168.42.150:6379> keys * 1) "magedu" 192.168.42.150:6379> 192.168.42.150:6379> set ok "verygood!!!" OK 192.168.42.150:6379> get ok "verygood!!!" 192.168.42.150:6379>
登录其他3台从服务器
redis-cli -h 192.168.42.151 redis-cli -h 192.168.42.152 redis-cli -h 192.168.42.153
拿153做示例: [root@redis-node4 src]# redis-cli -h 192.168.42.153 192.168.42.153:6379> keys * 1) "magedu" 192.168.42.153:6379> 192.168.42.153:6379> get ok "verygood!!!" 192.168.42.153:6379>
至此为至redis主/从已经实现,在主节点上查看信息
192.168.42.150:6379> INFO Replication # Replication role:master connected_slaves:3 slave0:ip=192.168.42.151,port=6379,state=online,offset=22806,lag=1 slave1:ip=192.168.42.152,port=6379,state=online,offset=22806,lag=1 slave2:ip=192.168.42.153,port=6379,state=online,offset=22806,lag=1 master_repl_offset:22806 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:2 repl_backlog_histlen:22805
接下来在四个结点上配置sentinel，实现故障转移。此处实现累似于MariaDB的MHA 在上面我们已经配置好主从复制集群,现在我们需要添加一台机器[192.168.42.154]来做高可用 同样我们需要设置好,IP,主机名,下载安装redis
192.168.42.154 redis-sentinel #将主机解析追加至其他的4台的hosts文件中,本机也需要一份 cd /usr/local/src wget http://192.168.42.26/install_package/down/redis-3.2.3-1.el7.x86_64.rpm yum install redis-3.2.3-1.el7.x86_64.rpm -y
(1)配置sentinel
# sentinel monitor <master-name> <ip> <redis-port> <quorum> #法定人数
cp /etc/redis-sentinel.conf{,.back}
vim /etc/redis-sentinel.conf
daemonize yes
sentinel monitor mymaster 192.168.42.150 6379 1
sentinel down-after-milliseconds mymaster 5000
sentinel failover-timeout mymaster 18000
sentinel auth-pass mymaster centos.123 #这是认证选项,我们这里的主节点并没有开启认证
(2)启动sentinel
redis-sentinel /etc/redis-sentinel.conf
查看端口是否已经启动
[root@redis-sentinel src]# ss -tnl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:22 *:* LISTEN 0 100 127.0.0.1:25 *:* LISTEN 0 511 *:26379 *:* LISTEN 0 128 :::22 :::* LISTEN 0 100 ::1:25 :::* LISTEN 0 511 :::26379 :::*
(3)模拟故障：
192.168.42.150:6379 pkill redis #查看 [root@redis-node1 ~]# ss -tnl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 *:22 *:* LISTEN 0 100 127.0.0.1:25 *:* LISTEN 0 128 :::22 :::* LISTEN 0 100 ::1:25
(4)查看故障是否转移
登录192.168.42.151:6379 #巧了,恰好151变成主了 192.168.42.151:6379> 192.168.42.151:6379> INFO Replication # Replication role:master connected_slaves:2 slave0:ip=192.168.42.153,port=6379,state=online,offset=5413,lag=1 slave1:ip=192.168.42.152,port=6379,state=online,offset=5413,lag=2 master_repl_offset:5413 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:2 repl_backlog_histlen:5412 192.168.42.151:6379> 登录192.168.42.152:6379查看,的确是151变成主了 192.168.42.152:6379> INFO Replication # Replication role:slave master_host:192.168.42.151 master_port:6379 master_link_status:up master_last_io_seconds_ago:1 master_sync_in_progress:0 slave_repl_offset:11402 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:0 192.168.42.152:6379>
(4)我们再把151的进程杀了,再来看一次,可以看到只有一主一从了
192.168.42.152:6379> INFO Replication # Replication role:master connected_slaves:1 slave0:ip=192.168.42.153,port=6379,state=online,offset=1625,lag=1 master_repl_offset:1768 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:2 repl_backlog_histlen:1767 192.168.42.152:6379>
(5)最后我们将杀死的两台redis恢复,再来查看
192.168.42.152:6379> INFO Replication # Replication role:master connected_slaves:3 slave0:ip=192.168.42.153,port=6379,state=online,offset=12763,lag=1 slave1:ip=192.168.42.151,port=6379,state=online,offset=12763,lag=1 slave2:ip=192.168.42.150,port=6379,state=online,offset=12763,lag=0 master_repl_offset:12763 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:2 repl_backlog_histlen:12762 192.168.42.152:6379> 可以看出此时的1主3从又回来了,不过此时主节点,是152 回到150,和151的节点查看效果 192.168.42.150:6379> INFO Replication # Replication role:slave master_host:192.168.42.152 master_port:6379 master_link_status:up master_last_io_seconds_ago:2 master_sync_in_progress:0 slave_repl_offset:23555 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:0 192.168.42.150:6379> 192.168.42.151:6379> INFO Replication # Replication role:slave master_host:192.168.42.152 master_port:6379 master_link_status:up master_last_io_seconds_ago:1 master_sync_in_progress:0 slave_repl_offset:20782 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
接下来我们配置有密码认证的主从和高可用
我们之前在配置sentinel,时还记得 #法定人数吗,判断为失效至少需要2个 Sentinel进程的同意，只要同意Sentinel的数量不达标，自动failover就不会执行
sentinel monitor #法定人数
我们现在将154这台干脆也做成redis的从服务器,而sentinel,是这5台的集合(150,151,152,153,154)
(1).将153的配置文件推到154一份
scp /etc/redis.conf{,.back} root@192.168.42.154:/etc/
到154这边稍微修改一下
vim /etc/redis.conf
bind 192.168.42.154
因此这次我们是要做密码认证的,因此5台机器都需要加上密码
(2).我们现在查看之前做了 sentinel后,配置文件系统自动帮我们改了,现在我们要恢复到初始状态,重新来过
所有的配置文件还需要设置我们的密码(为了方便管理,我们这里统一设置成magedu) requirepass magedu
所有从节点加上
#masterauth <master-password> masterauth magedu slaveof 192.168.42.150 6379
(3).密码设置好之后,启动所有服务
redis-server /etc/redis.conf ss -tnl
登录150,需要认证了
[root@redis-node1 ~]# redis-cli -h 192.168.42.150 192.168.42.150:6379> keys * (error) NOAUTH Authentication required. [root@redis-node1 ~]# redis-cli -h 192.168.42.150 192.168.42.150:6379> keys * (error) NOAUTH Authentication required. 192.168.42.150:6379> keys * (error) NOAUTH Authentication required. 192.168.42.150:6379> AUTH magedu OK
同样的,我们需要登录认证其他机器
再150机器上设置key 192.168.42.150:6379> set zlyc "zai lai yi ci" OK 192.168.42.150:6379> get zlyc "zai lai yi ci" 192.168.42.150:6379> 其他机器读取OK 192.168.42.151:6379> get zlyc "zai lai yi ci" 192.168.42.151:6379>
原创文章，作者：srayban，如若转载，请注明出处：http://www.178linux.com/81688
评论列表（1条）
这里有个坑，CentOS7 daemonize 由systemd托管了，所以这里不应该设置为yes，不然一退出终端，redis进程就GG了。