bigdata

redis 主从配置

要配置主从，我们必须安装两台redis：主服务器为master，从服务器为slave。安装步骤请参考我的上一篇 redis 的安装使用

我们在一台机器上面配置主从，多台的配置是一样的，只要修改下IP和PORT即可。以我们上一篇安装好的一台redis为基础，它的安装路径为：/home/hewentian/ProjectD/redis-4.0.11

1
2
3
$ cd /home/hewentian/ProjectD
$ mv redis-4.0.11 redis-4.0.11_master
$ cp -r redis-4.0.11_master/ redis-4.0.11_slave/

master服务器为：/home/hewentian/ProjectD/redis-4.0.11_master
slave服务器为：/home/hewentian/ProjectD/redis-4.0.11_slave

master服务器使用默认端口6379，所以不用配置。下面我们配置slave服务器：

1
2
3
4
5
6
7
$ cd /home/hewentian/ProjectD/redis-4.0.11_slave/
$ vi redis.conf

// 将默认端口改为6380，并加上 slaveof 127.0.0.1 6379 和 pidfile，在文件里面改动如下：
port 6380
slaveof 127.0.0.1 6379
pidfile /var/run/redis_6380.pid

保存文件并退出，slave服务器配置完成。

接着我们启动master和slave服务器

启动master服务器

1
2
$ cd /home/hewentian/ProjectD/redis-4.0.11_master/src/
$ ./redis-server /home/hewentian/ProjectD/redis-4.0.11_master/redis.conf

启动slave服务器

1
2
$ cd /home/hewentian/ProjectD/redis-4.0.11_slave/src/
$ ./redis-server /home/hewentian/ProjectD/redis-4.0.11_slave/redis.conf

在master服务器窗口中，可以看到如下信息：

1514:M 14 Aug 15:58:33.568 * Slave 127.0.0.1:6380 asks for synchronization
1514:M 14 Aug 15:58:33.568 * Full resync requested by slave 127.0.0.1:6380
1514:M 14 Aug 15:58:33.568 * Starting BGSAVE for SYNC with target: disk
1514:M 14 Aug 15:58:33.569 * Background saving started by pid 1584
1584:C 14 Aug 15:58:33.573 * DB saved on disk
1584:C 14 Aug 15:58:33.573 * RDB: 0 MB of memory used by copy-on-write
1514:M 14 Aug 15:58:33.576 * Background saving terminated with success
1514:M 14 Aug 15:58:33.576 * Synchronization with slave 127.0.0.1:6380 succeeded

在slave服务器窗口中，可以看到如下信息：

1579:S 14 Aug 15:58:33.567 * Connecting to MASTER 127.0.0.1:6379
1579:S 14 Aug 15:58:33.567 * MASTER <-> SLAVE sync started
1579:S 14 Aug 15:58:33.568 * Non blocking connect for SYNC fired the event.
1579:S 14 Aug 15:58:33.568 * Master replied to PING, replication can continue...
1579:S 14 Aug 15:58:33.568 * Partial resynchronization not possible (no cached master)
1579:S 14 Aug 15:58:33.569 * Full resync from master: 7f883c61e9326b040b150462901e70afd5c4a49c:0
1579:S 14 Aug 15:58:33.576 * MASTER <-> SLAVE sync: receiving 176 bytes from master
1579:S 14 Aug 15:58:33.577 * MASTER <-> SLAVE sync: Flushing old data
1579:S 14 Aug 15:58:33.577 * MASTER <-> SLAVE sync: Loading DB in memory
1579:S 14 Aug 15:58:33.577 * MASTER <-> SLAVE sync: Finished with success

从上面的信息中，我们可以知道，slave服务器已经连上master服务器。

测试同步数据

登录master服务器并在其中插入一个键

1
2
3
4
5
6
7
8
9
10
$ cd /home/hewentian/ProjectD/redis-4.0.11_master/src/
$ ./redis-cli -p 6379

127.0.0.1:6379> keys *
(empty list or set)
127.0.0.1:6379> set name "Tim Ho"
OK
127.0.0.1:6379> get name
"Tim Ho"
127.0.0.1:6379>

登录slave服务器并在其中获取一个键

1
2
3
4
5
6
7
8
9
10
$ cd /home/hewentian/ProjectD/redis-4.0.11_slave/src/
$ ./redis-cli -p 6380

127.0.0.1:6380> keys *
(empty list or set)
127.0.0.1:6380> keys *
1) "name"
127.0.0.1:6380> get name 
"Tim Ho"
127.0.0.1:6380>

至此，主从配置完成。