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+---
+title: 'openGauss CM组件代码阅读 一'
+date: '2024-06-13'
+category: 'blog'
+tags: ['openGauss CM组件代码阅读']
+archives: '2023-04'
+author: 'xucheng'
+summary: 'openGauss CM组件代码阅读'
+times: '14:30'
+---
+
+
+1.概述
+
+CM（Cluster Manager）是OpenGauss 社区3.0版本开源的高可用集群管理 组件。支持自定义资源监控，提供了数据库主备状态监控、网络通信故障监控、 文件系统故障监控、以及故障后自动切换主备等能力。 配合OpenGauss社区OM脚本，可以进行自动化高可用集群的部署安装和运 维操作。
+管理和监控数据库系统中各个功能单元和物理资源的运行情况，确保整 个数据库系统的稳定运行。 支持自定义资源监控，提供了数据库主备的状态监控、网络通信故障监 控、文件系统故障监控、故障自动主备切换等能力。提供了丰富的数据库管 理能力，如节点、实例级的启停，数据库实例状态查询、主备切换、日志管 理等功能。
+![](./cm-code-read-1.png)
+
+![](./cm-code-read-2.png)
+
+- cm_agent: 负责启停和数据库实例进 程监控上报、故障检测、执行下发的 仲裁命令 
+- cm_server：接收agent发送的各节点 实例状态，通过心跳超时或异常状态 消息，由cm_server主集中仲裁DN的 主备状态关系，触发故障迁移
+- cm_ctl：集群管理命令行 
+- om_monitor: cm_agent的守护进程
+
+
+2.代码结构
+
+![](./cm-code-read-3.png)
+
+3.cm_ctl
+
+主要负责代码启停，状态查询等操作。从实现上来说大体分为两类操作
+1）其中集群启停等操作由执行节点调用pssh，将标志文件拷贝到bin目录下。如cm_ctl会创建cluster_manual_start文件，停止重启操作类似。
+2）查询等操作需要与cm_server进行交互，cm_server处理指令返回给客户端，由客户端根据参数控制输出。 
+3）消息对应处理函数 
+
+![](./cm-code-read-4.png)
+
+4.om_monitor
+
+![](./cm-code-read-5.png)
+定制任务，负责监控cm_agent，severloop中不断检查agent,并不断进行。保证cm_agent能一直将状态发送给cm_server,并在用户使用om或者cm工具关闭集群之后，关闭cma。
+
+5.cm_agent
+
+多个线程不断采集DN和系统状态，并根据检查状态，选择杀死节点或者将信息发送给CM-Server
+
+6.cm_server
+
+1)选主逻辑
+
+![](./cm-code-read-6.png)
+2）示例
+
+![](./cm-code-read-7.png)
+
+![](./cm-code-read-8.png)
+3）消息对应处理函数
+
+![](./cm-code-read-9.png)
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