ZooKeeper安装与配置指南

1. 简介

ZooKeeper 是一个开源的分布式应用程序协调服务，是 Google 的 Chubby 一个开源的实现。

分布式同步
命名服务
集群维护
分布式锁

2. 概念

Leader
Follower
Observer

3. 安装

3.1. 单机

安装

wget https://dlcdn.apache.org/zookeeper/zookeeper-3.8.4/apache-zookeeper-3.8.4-bin.tar.gz
mv apache-zookeeper-3.8.4-bin.tar.gz /opt/software
cd /opt/software
tar -zxvf apache-zookeeper-3.8.4-bin.tar.gz
mkdir /data/zookeeper
# 环境变量
export ZOOKEEPER_HOME=/opt/software/apache-zookeeper-3.8.4-bin
export PATH=$ZOOKEEPER_HOME/bin:$PATH

配置

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/data/zookeeper
# the port at which the clients will connect
clientPort=2181
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the
# administrator guide before turning on autopurge.
#
# https://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1

## Metrics Providers
#
# https://prometheus.io Metrics Exporter
#metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider
#metricsProvider.httpHost=0.0.0.0
#metricsProvider.httpPort=7000
#metricsProvider.exportJvmInfo=true

3.2. 集群

安装

参考单机安装部分。

配置

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/data/zookeeper
# the port at which the clients will connect
clientPort=2181
# 配置集群
server.1=slave1:2888:3888
server.2=slave2:2888:3888
server.3=slave3:2888:3888

myid

# 写入 myid 文件以标识当前节点
/opt/software/apache-zookeeper-3.8.4-bin/data/myid
1

4. 使用

4.1. 服务端

zkServer.sh start
zkServer.sh start-foreground
zkServer.sh stop
zkServer.sh status
zkServer.sh restart

4.2. 客户端

zkCli.sh -server 127.0.0.1:2181

4.3. 管理

systemd 配置

## 需要指明jdk环境变量和ZOO_LOG_DIR
[Unit]
# 服务描述
Description=zookeeper
# 在网络服务启动后运行
After=network.target

[Service]
Type=forking
# jdk环境变量
Environment=JAVA_HOME=/opt/software/jdk1.8.0_351
# 启动命令
ExecStart=/opt/software/apache-zookeeper-3.8.4-bin/bin/zkServer.sh start
# 停止命令
ExecStop=/opt/software/apache-zookeeper-3.8.4-bin/bin/zkServer.sh stop
# 重载命令
ExecReload=/opt/software/apache-zookeeper-3.8.4-bin/bin/zkServer.sh restart

[Install]
WantedBy=multi-user.target

管理

systemctl daemon-reload
systemctl enable zookeeper
systemctl restart zookeeper

可视化工具

wget https://issues.apache.org/jira/secure/attachment/12436620/ZooInspector.zip
unzip ZooInspector.zip
java -jar zookeeper-dev-ZooInspector.jar

5. 拓展信息

…

6. 参考资料

官方链接