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使用 Exhibitor 监控管理 ZooKeeper

 5 years ago
source link: https://wsgzao.github.io/post/exhibitor/?amp%3Butm_medium=referral
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Exhibitor 是 Netflix 开源的一个用于 ZooKeeper 配置监控和管理的系统。现在 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。

使用 Exhibitor 监控管理 ZooKeeper

更新历史

2019 年 01 月 07 日 - 初稿

阅读原文 - https://wsgzao.github.io/post/exhibitor/

扩展阅读

exhibitor - https://github.com/soabase/exhibitor

exhibitor 简介

ZooKeeper co-process for instance monitoring, backup/recovery, cleanup and visualization.

Exhibitor is a Java supervisor system for ZooKeeper. It provides a number of features:

  • Watches a ZK instance and makes sure it is running
  • Performs periodic backups
  • Perform periodic cleaning of ZK log directory
  • A GUI explorer for viewing ZK nodes
  • A rich REST API

https://github.com/soabase/exhibitor/wiki

exhibitor 特性

Exhibitor 主要包括以下特性 / 功能：

实例监控

Exhibitor 实例监控在同一服务器上运行的 ZooKeeper 服务器。如果 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。如果 ZooKeeper 由于某种原因崩溃，Exhibitor 也会重新启动它。

日志清理

在 ZooKeeper 3.4.x 之前的版本中，日志文件需要维护，Exhibitor 会负责定期维护。

备份 / 还原

ZooKeeper 集群中的备份比传统数据存储（例如 RDBMS）更复杂。一般来说，ZooKeeper 中的大部分数据是短暂的。盲目恢复整个 ZooKeeper 数据集可能会造成更大危害，因此，需要选择性的恢复以防止对数据集的子集造成意外损坏。Exhibitor 提供了这一功能。

Exhibitor 会定期备份 ZooKeeper 的事务文件，备份后，就可以对这些事务文件建立索引。

集群配置

Exhibitor 为整个 Zookeeper 集群提供了一个独立的控制台，通过它所做的配置更改会对整个集群有效。以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 可以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 可以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 集群可以实现 “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，维护人员可以在 ZooKeeper 的存储层次结构中创建 / 更新 / 删除节点。

死锁检测

当使用 Curator 的锁方案（或类似）时，Exhibitor 可以分析一组表示锁的 ZNode，并确定是否存在潜在的死锁。

Curator 集成

Exhibitor 和 Curator 可以集成工作，当集群中的信息变更时，Curator 实例可以同步更新。

REST API

Exhibitor 提供了一组用于程序集成的 REST API。

重要事项

  1. 使用 Exhibitor 时，不要手动编辑 Zookeeper 的 zoo.cfg 和 myid 文件，因为 Exhibitor 会覆盖它们。
  2. 除了标准的 ZooKeeper 端口，防火墙必须打开 Exhibitor 使用的 HTTP 端口，因为每个 Exhibitor 实例需要与其他参与者通信传递状态。

使用

Exhibitor 的部署构件可以从 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（可以是独立应用，也可以是 War） com.netflix.exhibitor exhibitor-core 类库的形式，可以嵌入到应用中

exhibitor 编译安装

官方分享了 Maven 和 Gradle 两种 build 方法，这里以 Maven 为例

https://github.com/soabase/exhibitor/wiki/Building-Exhibitor 

# 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 [email protected]: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

管理 zookeeper 集群

如果需要通过 Exhibitor 管理 zookeeper 集群需要在集群的每个机器上安装 Exhibitor

https://github.com/soabase/exhibitor/wiki/Configuration-UI

重点提一下 Ensemble 中的 Servers 配置:

  • 服务器 IP 之间用逗号分隔，有两种类型：S 表示标准类型，O 表示 Observer 观察者
  • S:1:192.168.56.101,S:2:192.168.56.102,S:3:192.168.56.103

report

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