转载自:http://blog.csdn.net/pi9nc/article/details/17735653 (这个上面没有写 转自哪里,我只能写上他的链接了。)
作者:oyhk 2013-10-10 23:55:49 0 评论 629浏览
oyhk 学习笔记
网站的访问量慢慢上来了。为了网站的性能方面,开始用了redis做缓存策略。刚开始的时候,redis是一个单点,当一台机器岩机的时候,redis的服务完全停止,这时就会影响其他服务的正常运行。费话不多说了,下面利用redis sentinel做一个主从切换的集群管理。做这个集群管理的时候,查过很多资料才完全了解,他是怎么做的。
java 客户端请看:
http://blog.mkfree.com/posts/52b146e6479e5a64742fddd0
参考资料:http://redis.io/topics/sentinel 我也是看这篇文章。
环境配置:
由于我这次配置没有太多的机器,我用了vagrant 去开了多台虚拟机。然后搭好了环境。
redis的安装请参考:redis 简单官方脚本安装方法(linux)
集群配置最少需要三台机器,那么我就三台虚拟机,三台虚拟机分别安装同样的redis的环境
ip分别:
redis配置:
主的redis配置文件,使用默认的配置文件就可以了,如果你需要设计其他参数
从的redis配置文件,添加
<span class="pun" style="color: rgb(102, 102, 0);">#从的</span><span class="pln" style="color: rgb(0, 0, 0);">redis</span><span class="pun" style="color: rgb(102, 102, 0);">配置文件,需要添加</span><span class="pln" style="color: rgb(0, 0, 0);"> vim </span><span class="pun" style="color: rgb(102, 102, 0);">/</span><span class="pln" style="color: rgb(0, 0, 0);">etc</span><span class="pun" style="color: rgb(102, 102, 0);">/</span><span class="pln" style="color: rgb(0, 0, 0);">redis</span><span class="pun" style="color: rgb(102, 102, 0);">/</span><span class="lit" style="color: rgb(0, 102, 102);">6379.conf</span><span class="pln" style="color: rgb(0, 0, 0);"> slaveof </span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.18</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="lit" style="color: rgb(0, 102, 102);">6379</span>
启动主从redis
<span class="pun" style="color: rgb(102, 102, 0);">#启动主</span><span class="pln" style="color: rgb(0, 0, 0);">redis</span><span class="pun" style="color: rgb(102, 102, 0);">(</span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.18</span><span class="pun" style="color: rgb(102, 102, 0);">)</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">/</span><span class="pln" style="color: rgb(0, 0, 0);">etc</span><span class="pun" style="color: rgb(102, 102, 0);">/</span><span class="pln" style="color: rgb(0, 0, 0);">init</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="pln" style="color: rgb(0, 0, 0);">d</span><span class="pun" style="color: rgb(102, 102, 0);">/</span><span class="pln" style="color: rgb(0, 0, 0);">redis_6379</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="pln" style="color: rgb(0, 0, 0);">conf start </span><span class="pun" style="color: rgb(102, 102, 0);">#启动从</span><span class="pln" style="color: rgb(0, 0, 0);">redis</span><span class="pun" style="color: rgb(102, 102, 0);">(</span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.19</span><span class="pun" style="color: rgb(102, 102, 0);">)</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">/</span><span class="pln" style="color: rgb(0, 0, 0);">etc</span><span class="pun" style="color: rgb(102, 102, 0);">/</span><span class="pln" style="color: rgb(0, 0, 0);">init</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="pln" style="color: rgb(0, 0, 0);">d</span><span class="pun" style="color: rgb(102, 102, 0);">/</span><span class="pln" style="color: rgb(0, 0, 0);">redis_6379</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="pln" style="color: rgb(0, 0, 0);">conf start</span>
查看主redis信息
<span class="pun" style="color: rgb(102, 102, 0);">#查看主</span><span class="pln" style="color: rgb(0, 0, 0);">redis</span><span class="pun" style="color: rgb(102, 102, 0);">的信息</span><span class="pln" style="color: rgb(0, 0, 0);"> redis</span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">cli </span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">h </span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.18</span><span class="pln" style="color: rgb(0, 0, 0);"> info </span><span class="typ" style="color: rgb(102, 0, 102);">Replication</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">#</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="typ" style="color: rgb(102, 0, 102);">Replication</span><span class="pln" style="color: rgb(0, 0, 0);"> role</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="pln" style="color: rgb(0, 0, 0);">master </span><span class="pun" style="color: rgb(102, 102, 0);">#代表</span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.18</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">6379</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">这台</span><span class="pln" style="color: rgb(0, 0, 0);">redis</span><span class="pun" style="color: rgb(102, 102, 0);">是主</span><span class="pln" style="color: rgb(0, 0, 0);"> connected_slaves</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">1</span><span class="pln" style="color: rgb(0, 0, 0);"> slave0</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.18</span><span class="pun" style="color: rgb(102, 102, 0);">,</span><span class="lit" style="color: rgb(0, 102, 102);">6379</span><span class="pun" style="color: rgb(102, 102, 0);">,</span><span class="pln" style="color: rgb(0, 0, 0);">online</span>
查看从redis信息
<span class="pun" style="color: rgb(102, 102, 0);">#查看主</span><span class="pln" style="color: rgb(0, 0, 0);">redis</span><span class="pun" style="color: rgb(102, 102, 0);">的信息</span><span class="pln" style="color: rgb(0, 0, 0);"> redis</span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">cli </span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">h </span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.19</span><span class="pln" style="color: rgb(0, 0, 0);"> info </span><span class="typ" style="color: rgb(102, 0, 102);">Replication</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">#</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="typ" style="color: rgb(102, 0, 102);">Replication</span><span class="pln" style="color: rgb(0, 0, 0);"> role</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="pln" style="color: rgb(0, 0, 0);">slave </span><span class="pun" style="color: rgb(102, 102, 0);">#代表</span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.18</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">6379</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">这台</span><span class="pln" style="color: rgb(0, 0, 0);">redis</span><span class="pun" style="color: rgb(102, 102, 0);">是主</span><span class="pln" style="color: rgb(0, 0, 0);"> master_host</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.18</span><span class="pln" style="color: rgb(0, 0, 0);"> master_port</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">6379</span><span class="pln" style="color: rgb(0, 0, 0);"> master_link_status</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="pln" style="color: rgb(0, 0, 0);">up master_last_io_seconds_ago</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">4</span><span class="pln" style="color: rgb(0, 0, 0);"> master_sync_in_progress</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">0</span><span class="pln" style="color: rgb(0, 0, 0);"> slave_priority</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">100</span><span class="pln" style="color: rgb(0, 0, 0);"> slave_read_only</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">1</span><span class="pln" style="color: rgb(0, 0, 0);"> connected_slaves</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">0</span>配置redis sentinel集群监控服务
1.添加一份redis sentinel 配置文件
<span class="pln" style="color: rgb(0, 0, 0);">vim </span><span class="pun" style="color: rgb(102, 102, 0);">/</span><span class="pln" style="color: rgb(0, 0, 0);">etc</span><span class="pun" style="color: rgb(102, 102, 0);">/</span><span class="pln" style="color: rgb(0, 0, 0);">redis</span><span class="pun" style="color: rgb(102, 102, 0);">/</span><span class="pln" style="color: rgb(0, 0, 0);">sentinel</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="pln" style="color: rgb(0, 0, 0);">conf </span><span class="pun" style="color: rgb(102, 102, 0);">##</span><span class="pln" style="color: rgb(0, 0, 0);">redis</span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="lit" style="color: rgb(0, 102, 102);">0</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">##</span><span class="pln" style="color: rgb(0, 0, 0);">sentinel</span><span class="pun" style="color: rgb(102, 102, 0);">实例之间的通讯端口</span><span class="pln" style="color: rgb(0, 0, 0);"> port </span><span class="lit" style="color: rgb(0, 102, 102);">26379</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">#</span><span class="pln" style="color: rgb(0, 0, 0);">master1 sentinel monitor master1 </span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.18</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="lit" style="color: rgb(0, 102, 102);">6379</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="lit" style="color: rgb(0, 102, 102);">1</span><span class="pln" style="color: rgb(0, 0, 0);"> sentinel down</span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">after</span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">milliseconds master1 </span><span class="lit" style="color: rgb(0, 102, 102);">5000</span><span class="pln" style="color: rgb(0, 0, 0);"> sentinel failover</span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">timeout master1 </span><span class="lit" style="color: rgb(0, 102, 102);">900000</span><span class="pln" style="color: rgb(0, 0, 0);"> sentinel can</span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">failover master1 yes sentinel parallel</span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">syncs master1 </span><span class="lit" style="color: rgb(0, 102, 102);">2</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">#</span><span class="pln" style="color: rgb(0, 0, 0);">master2 </span><span class="pun" style="color: rgb(102, 102, 0);">可以添加多组主从的</span><span class="pln" style="color: rgb(0, 0, 0);">redis</span><span class="pun" style="color: rgb(102, 102, 0);">监听</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">...</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">..</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">..</span>2.有配置文件了,那么启动redis sentinel做redis集群监听
<span class="pln" style="color: rgb(0, 0, 0);">redis</span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">sentinel sentinel</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="pln" style="color: rgb(0, 0, 0);">conf </span><span class="pun" style="color: rgb(102, 102, 0);">--</span><span class="pln" style="color: rgb(0, 0, 0);">sentinel</span>好了,所有环境都搭好了。下面开始正式的演示
1.正常演示。
观察redis sentinel 日志信息
这里很清楚地看到,从的redis加入了集群
<span class="pun" style="color: rgb(102, 102, 0);">[</span><span class="lit" style="color: rgb(0, 102, 102);">4925</span><span class="pun" style="color: rgb(102, 102, 0);">]</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="lit" style="color: rgb(0, 102, 102);">15</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="typ" style="color: rgb(102, 0, 102);">Oct</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="lit" style="color: rgb(0, 102, 102);">03</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">42</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">21.889</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">*</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">+</span><span class="pln" style="color: rgb(0, 0, 0);">slave slave </span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.19</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">6379</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.19</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="lit" style="color: rgb(0, 102, 102);">6379</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">@</span><span class="pln" style="color: rgb(0, 0, 0);"> master1 </span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.18</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="lit" style="color: rgb(0, 102, 102);">6379</span>
执行以下命令,查看redis主从信息
<span class="pun" style="color: rgb(102, 102, 0);">[</span><span class="pln" style="color: rgb(0, 0, 0);">root@localhost vagrant</span><span class="pun" style="color: rgb(102, 102, 0);">]#</span><span class="pln" style="color: rgb(0, 0, 0);"> redis</span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">cli </span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">h </span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.17</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">p </span><span class="lit" style="color: rgb(0, 102, 102);">26379</span><span class="pln" style="color: rgb(0, 0, 0);"> info </span><span class="typ" style="color: rgb(102, 0, 102);">Sentinel</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">#</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="typ" style="color: rgb(102, 0, 102);">Sentinel</span><span class="pln" style="color: rgb(0, 0, 0);"> sentinel_masters</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">1</span><span class="pln" style="color: rgb(0, 0, 0);"> sentinel_tilt</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">0</span><span class="pln" style="color: rgb(0, 0, 0);"> sentinel_running_scripts</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">0</span><span class="pln" style="color: rgb(0, 0, 0);"> sentinel_scripts_queue_length</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">0</span><span class="pln" style="color: rgb(0, 0, 0);"> master0</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="pln" style="color: rgb(0, 0, 0);">name</span><span class="pun" style="color: rgb(102, 102, 0);">=</span><span class="pln" style="color: rgb(0, 0, 0);">master1</span><span class="pun" style="color: rgb(102, 102, 0);">,</span><span class="pln" style="color: rgb(0, 0, 0);">status</span><span class="pun" style="color: rgb(102, 102, 0);">=</span><span class="pln" style="color: rgb(0, 0, 0);">ok</span><span class="pun" style="color: rgb(102, 102, 0);">,</span><span class="pln" style="color: rgb(0, 0, 0);">address</span><span class="pun" style="color: rgb(102, 102, 0);">=</span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.18</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">6379</span><span class="pun" style="color: rgb(102, 102, 0);">,</span><span class="pln" style="color: rgb(0, 0, 0);">slaves</span><span class="pun" style="color: rgb(102, 102, 0);">=</span><span class="lit" style="color: rgb(0, 102, 102);">1</span><span class="pun" style="color: rgb(102, 102, 0);">,</span><span class="pln" style="color: rgb(0, 0, 0);">sentinels</span><span class="pun" style="color: rgb(102, 102, 0);">=</span><span class="lit" style="color: rgb(0, 102, 102);">1</span>
那么表示一切都正常了。你的redis sentinel集群已经配置成功!
2.1当主的redis 服务器岩机了,会发生什么情况呢?
执行以下命令使用主的redis服务停止
<span class="pln" style="color: rgb(0, 0, 0);">redis</span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">cli </span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">h </span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.18</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">p </span><span class="lit" style="color: rgb(0, 102, 102);">6379</span><span class="pln" style="color: rgb(0, 0, 0);"> shutdown </span><span class="pun" style="color: rgb(102, 102, 0);">#表示把</span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.18</span><span class="pun" style="color: rgb(102, 102, 0);">这台</span><span class="pln" style="color: rgb(0, 0, 0);">redis </span><span class="pun" style="color: rgb(102, 102, 0);">关闭</span>关闭后,我们再查看redis sentinel 的日志情况
这张图片很清晰地反应到,redis sentinel 监控到主的redis服务停止,然后自动把从的redis切换到主。
再执行以下命令,查看redis主从信息
<span class="pun" style="color: rgb(102, 102, 0);">[</span><span class="pln" style="color: rgb(0, 0, 0);">root@localhost vagrant</span><span class="pun" style="color: rgb(102, 102, 0);">]#</span><span class="pln" style="color: rgb(0, 0, 0);"> redis</span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">cli </span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">h </span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">33.111</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">-</span><span class="pln" style="color: rgb(0, 0, 0);">p </span><span class="lit" style="color: rgb(0, 102, 102);">26379</span><span class="pln" style="color: rgb(0, 0, 0);"> info </span><span class="typ" style="color: rgb(102, 0, 102);">Sentinel</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="pun" style="color: rgb(102, 102, 0);">#</span><span class="pln" style="color: rgb(0, 0, 0);"> </span><span class="typ" style="color: rgb(102, 0, 102);">Sentinel</span><span class="pln" style="color: rgb(0, 0, 0);"> sentinel_masters</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">1</span><span class="pln" style="color: rgb(0, 0, 0);"> sentinel_tilt</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">0</span><span class="pln" style="color: rgb(0, 0, 0);"> sentinel_running_scripts</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">0</span><span class="pln" style="color: rgb(0, 0, 0);"> sentinel_scripts_queue_length</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">0</span><span class="pln" style="color: rgb(0, 0, 0);"> master0</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="pln" style="color: rgb(0, 0, 0);">name</span><span class="pun" style="color: rgb(102, 102, 0);">=</span><span class="pln" style="color: rgb(0, 0, 0);">master1</span><span class="pun" style="color: rgb(102, 102, 0);">,</span><span class="pln" style="color: rgb(0, 0, 0);">status</span><span class="pun" style="color: rgb(102, 102, 0);">=</span><span class="pln" style="color: rgb(0, 0, 0);">ok</span><span class="pun" style="color: rgb(102, 102, 0);">,</span><span class="pln" style="color: rgb(0, 0, 0);">address</span><span class="pun" style="color: rgb(102, 102, 0);">=</span><span class="lit" style="color: rgb(0, 102, 102);">192.168</span><span class="pun" style="color: rgb(102, 102, 0);">.</span><span class="lit" style="color: rgb(0, 102, 102);">9.19</span><span class="pun" style="color: rgb(102, 102, 0);">:</span><span class="lit" style="color: rgb(0, 102, 102);">6379</span><span class="pun" style="color: rgb(102, 102, 0);">,</span><span class="pln" style="color: rgb(0, 0, 0);">slaves</span><span class="pun" style="color: rgb(102, 102, 0);">=</span><span class="lit" style="color: rgb(0, 102, 102);">1</span><span class="pun" style="color: rgb(102, 102, 0);">,</span><span class="pln" style="color: rgb(0, 0, 0);">sentinels</span><span class="pun" style="color: rgb(102, 102, 0);">=</span><span class="lit" style="color: rgb(0, 102, 102);">1</span>把从已经升为主了。那么自动切换就已经成功了!
2.2 当我们已经发现,一台redis发生故障了,可能会收到一些故障信息,那么再把服务已关闭的redis恢复服务状态,会发生怎么样的情况呢?
redis sentinel 集群服务,会把上次主redis重新加入服务中,但是他再以不是主的redis了,变成从的reids。
哈.....完成了。。。下篇会写关于,客户端调用主从集群自动切换使用例子。我会以java为使用客户端.