Exhibitor 是 Netflix 开源的一个用于 ZooKeeper 配置监控和管理的系统。如今 Netflix Exhibitor 已经成为社区开源公共维护项目 Soabase Exhibitor。Exhibitor 是 ZooKeeper 实例监控，备份，恢复，清理和可视化工具，是 ZooKeeper 的监控管理系统。html
使用 Exhibitor 监控管理 ZooKeeper
2019年01月07日 - 初稿java
阅读原文 - https://wsgzao.github.io/post...node
扩展阅读git
exhibitor - https://github.com/soabase/ex...github
ZooKeeper co-process for instance monitoring, backup/recovery, cleanup and visualization.bash
Exhibitor is a Java supervisor system for ZooKeeper. It provides a number of features:服务器
https://github.com/soabase/ex...app
Exhibitor 主要包括如下特性 / 功能：
实例监控maven
Exhibitor 实例监控在同一服务器上运行的 ZooKeeper 服务器。若是 ZK 没有运行，Exhibitor 会写入 zoo.cfg 文件（请参阅下面的 ZK 集群配置）并启动它。若是 ZooKeeper 因为某种缘由崩溃，Exhibitor 也会从新启动它。ide
日志清理
在 ZooKeeper 3.4.x 以前的版本中，日志文件须要维护，Exhibitor 会负责按期维护。
备份 / 还原
ZooKeeper 集群中的备份比传统数据存储（例如 RDBMS）更复杂。通常来讲，ZooKeeper 中的大部分数据是短暂的。盲目恢复整个 ZooKeeper 数据集可能会形成更大危害，所以，须要选择性的恢复以防止对数据集的子集形成意外损坏。Exhibitor 提供了这一功能。
Exhibitor 会按期备份 ZooKeeper 的事务文件，备份后，就能够对这些事务文件创建索引。
集群配置
Exhibitor 为整个 Zookeeper 集群提供了一个独立的控制台，经过它所作的配置更改会对整个集群有效。如下是一些共享配置值：
| Name | Description |
|---|---|
| ZooKeeper Install DirPath | to the ZooKeeper server installation |
| ZooKeeper Data Dir | Path where ZooKeeper should store its data |
| Log Index Dir | Path where indexed transaction logs should be kept |
| Servers | List of servers/server-ids in the ensemble |
| Additional Config | Additional fields/values to store in zoo.cfg |
集群滚动升级
Exhibitor 能够以滚动方式更新集群中的服务器，以便在进行更改时让 ZooKeeper 集群确保 Quorum 设定的最低服务能力。
自动实例管理
Exhibitor 能够配置为自动向集群中添加新实例，并删除陈旧的实例。这使得 ZooKeeper 集群能够实现 “无接触交钥匙管理”。
可视化
Exhibitor 为 ZooKeeper 提供了 ZNode 层次结构的图形树视图。
ZK 数据维护
启用后，维护人员能够在 ZooKeeper 的存储层次结构中建立 / 更新 / 删除节点。
死锁检测
当使用 Curator 的锁方案（或相似）时，Exhibitor 能够分析一组表示锁的 ZNode，并肯定是否存在潜在的死锁。
Curator 集成
Exhibitor 和 Curator 能够集成工做，当集群中的信息变动时，Curator 实例能够同步更新。
REST API
Exhibitor 提供了一组用于程序集成的 REST API。
重要事项
使用
Exhibitor 的部署构件能够从 Maven 仓库获取。构件分为两种：
| GroupID/Org | ArtifactID/Name | Description |
|---|---|---|
| com.netflix.exhibitor | exhibitor-standalone | 自包含的，可执行的 Exhibitor 版本（能够是独立应用，也能够是 War） |
| com.netflix.exhibitor | exhibitor-core | 类库的形式，能够嵌入到应用中 |
官方分享了Maven和Gradle两种build方法，这里以Maven为例
https://github.com/soabase/ex...
# install maven yum install -y maven # build exhibitor mkdir exhibitor cd exhibitor/ wget https://github.com/soabase/exhibitor/archive/exhibitor-1.7.1.zip unzip exhibitor-1.7.1.zip cd exhibitor-exhibitor-1.7.1/exhibitor-standalone/src/main/resources/buildscripts/standalone/maven mvn clean package [INFO] Replacing original artifact with shaded artifact. [INFO] Replacing /root/exhibitor/exhibitor-exhibitor-1.7.1/exhibitor-standalone/src/main/resources/buildscripts/standalone/maven/target/exhibitor-1.6.0.jar with /root/exhibitor/exhibitor-exhibitor-1.7.1/exhibitor-standalone/src/main/resources/buildscripts/standalone/maven/target/exhibitor-1.6.0-shaded.jar [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 44.624s [INFO] Finished at: Tue Jan 08 11:28:59 SGT 2019 [INFO] Final Memory: 15M/94M [INFO] ------------------------------------------------------------------------ cp target/exhibitor-1.6.0.jar /tmp # Once built, Exhibitor is completely self-contained and can be run from the command line: java -jar <path>/exhibitor-xxx.jar -c file [root@localhost ~]# java -jar exhibitor-1.6.0.jar -c file v1.6.0 INFO com.netflix.exhibitor.core.activity.ActivityLog Exhibitor started [main] Jan 08, 2019 11:32:38 AM java.util.prefs.FileSystemPreferences$1 run INFO: Created user preferences directory. INFO org.mortbay.log Logging to org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog [main] INFO org.mortbay.log jetty-1.6.0 [main] Jan 08, 2019 11:32:38 AM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate INFO: Initiating Jersey application, version 'Jersey: 1.18.3 12/01/2014 08:23 AM' INFO org.mortbay.log Started SocketConnector@0.0.0.0:8080 [main] Jan 08, 2019 11:33:00 AM java.util.prefs.FileSystemPreferences$6 run WARNING: Prefs file removed in background /root/.java/.userPrefs/prefs.xml INFO com.netflix.exhibitor.core.activity.ActivityLog State: latent [ActivityQueue-0] # You can test that it’s running correctly by going to this URL in a browser: http://localhost:8080/exhibitor/v1/ui/index.html http://192.168.56.103:8080/exhibitor/v1/ui/index.html
若是须要经过 Exhibitor 管理 zookeeper 集群须要在集群的每一个机器上安装 Exhibitor
https://github.com/soabase/ex...
重点提一下Ensemble中的Servers配置: