部署ZooKeeper

1、单机部署ZooKeeper

1-1、配置 Java 环境

[root@ubuntu2004 ~]#apt install -y openjdk-8-jdk

1-2、下载zookeeper

#官方下载：
[root@ubuntu2004 ~]#wget https://dlcdn.apache.org/zookeeper/zookeeper-3.7.1/apache-zookeeper-3.7.1-bin.tar.gz

#国内清华源下载（建议）：
[root@ubuntu2004 ~]#wget https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/zookeeper-3.7.1/apache-zookeeper-3.7.1-bin.tar.gz

1-3、解压并修改配置

[root@ubuntu2004 ~]#tar xf apache-zookeeper-3.7.1-bin.tar.gz -C /usr/local/
[root@ubuntu2004 ~]#cd /usr/local/
[root@ubuntu2004 local]#ln -s apache-zookeeper-3.7.1-bin /usr/local/zookeeper
[root@ubuntu2004 local]#echo 'PATH=/usr/local/zookeeper/bin:$PATH' > /etc/profile.d/zookeeper.sh
[root@ubuntu2004 local]#. /etc/profile.d/zookeeper.sh

#修改配置：
[root@ubuntu2004 local]#cp /usr/local/zookeeper/conf/zoo_sample.cfg /usr/local/zookeeper/conf/zoo.cfg
[root@ubuntu2004 local]#vim /usr/local/zookeeper/conf/zoo.cfg
tickTime=2000     #"滴答时间"，用于配置Zookeeper中最小的时间单元长度，单位毫秒，是其它时间配置的基础
initLimit=10    #初始化时间，包含启动和数据同步，其值是tickTime的倍数
syncLimit=5     #正常工作，心跳监测的时间间隔，其值是tickTime的倍数
dataDir=/usr/local/zookeeper/data       #配置Zookeeper服务存储数据的目录,基于安全,可以修改为服务所在目录下
dataLogdir=/usr/local/zookeeper/logs    #可以指定日志路径
clientPort=2181               #配置当前Zookeeper服务对外暴露的端口，用户客户端和服务端建立连接会话
autopurge.snapRetainCount=3             #启用后，ZooKeeper 自动清除功能,会将只保留此最新3个快照和相应的事务日志,并分别保留在dataDir 和dataLogDir中，删除其余部分，默认值为3,最小值为3
autopurge.purgeInterval=24              #3.4.0及之后版本，ZK提供了自动清理日志和快照文件的功能，这个参数指定了清理频率，单位是小时，需要配置一个1或更大的整数，默认是 0，表示不开启自动清理功能

1-4、启动zookeeper

1-4-1、启动方式一：

#前台启动
[root@ubuntu2004 local]#zkServer.sh start-foreground

##后台启动
[root@ubuntu2004 local]#zkServer.sh start

[root@ubuntu2004 local]#zkServer.sh status
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost. Client SSL: false.
Mode: standalone

#注意:如果配置service,zkServer.sh和systemctl不要混用,否则无法启动

1-4-2、启动方式二：

#配置service文件：

[root@ubuntu2004 local]#vim /usr/lib/systemd/system/zookeeper.service
[Unit]
Description=zookeeper.service
After=network.target

[Service]
Type=forking
ExecStart=/usr/local/zookeeper/bin/zkServer.sh start
ExecStop=/usr/local/zookeeper/bin/zkServer.sh stop
ExecReload=/usr/local/zookeeper/bin/zkServer.sh restart

[Install]
WantedBy=multi-user.target

[root@ubuntu2004 local]#systemctl daemon-reload 
[root@ubuntu2004 local]#systemctl start zookeeper.service

2、部署ZooKeeper 集群

2-1、环境准备

2-2、安装openjdk

#所有节点执行：
[root@zookeeper-node1 ~]#apt install -y openjdk-8-jdk

2-3、下载zookeeper并解压

#所有节点执行：
[root@zookeeper-node1 ~]#wget https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/zookeeper-3.7.1/apache-zookeeper-3.7.1-bin.tar.gz
[root@zookeeper-node1 ~]#tar xf apache-zookeeper-3.7.1-bin.tar.gz -C /usr/local/
[root@zookeeper-node1 ~]#cd /usr/local
[root@zookeeper-node1 local]#ln -s apache-zookeeper-3.7.1-bin zookeeper
[root@zookeeper-node1 local]#echo 'PATH=/usr/local/zookeeper/bin:$PATH' > /etc/profile.d/zookeeper.sh
[root@zookeeper-node1 local]#. /etc/profile.d/zookeeper.sh

#所有节点执行：
[root@zookeeper-node1 local]#cp /usr/local/zookeeper/conf/zoo_sample.cfg /usr/local/zookeeper/conf/zoo.cfg
[root@zookeeper-node1 local]#vim /usr/local/zookeeper/conf/zoo.cfg
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/usr/local/zookeeper/data
dataLogdir=/usr/local/zookeeper/logs
clientPort=2181
maxClientCnxns=128             #单个客户端IP 可以和zookeeper保持的连接数
autopurge.snapRetainCount=3
autopurge.purgeInterval=24

server.101=10.0.0.101:2888:3888
server.102=10.0.0.102:2888:3888
server.103=10.0.0.103:2888:3888

[root@zookeeper-node1 local]#mkdir /usr/local/zookeeper/data

================
#格式说明：
# server.服务器唯一编号=服务器IP:Leader和Follower的数据同步端口(只有leader才会打开):Leader和Follower选举端口(L和F都有)
server.101=10.0.0.101:2888:3888
server.102=10.0.0.102:2888:3888
server.103=10.0.0.103:2888:3888
#如果添加节点,只需要在所有节点上添加新节点的上面形式的配置行,在新节点创建myid文件,并重启所有节点服务即可

#偷个懒，把配置拷贝到其他节点：
[root@zookeeper-node1 local]#scp /usr/local/zookeeper/conf/zoo.cfg 10.0.0.102:/usr/local/zookeeper/conf/zoo.cfg
[root@zookeeper-node1 local]#scp /usr/local/zookeeper/conf/zoo.cfg 10.0.0.103:/usr/local/zookeeper/conf/zoo.cfg

2-4、在各个节点生成ID文件

#各节点分别执行：
[root@zookeeper-node1 local]#echo 101 > /usr/local/zookeeper/data/myid
[root@zookeeper-node2 local]#echo 102 > /usr/local/zookeeper/data/myid
[root@zookeeper-node3 local]#echo 103 > /usr/local/zookeeper/data/myid
注意: 各个myid文件的内容要和zoo.cfg文件相匹配

2-5、生成service文件并启动

#所有节点执行：
[root@zookeeper-node1 ~]#vim /usr/lib/systemd/system/zookeeper.service 
[Unit]
Description=zookeeper.service
After=network.target

[Service]
Type=forking
ExecStart=/usr/local/zookeeper/bin/zkServer.sh start
ExecStop=/usr/local/zookeeper/bin/zkServer.sh stop
ExecReload=/usr/local/zookeeper/bin/zkServer.sh restart

[Install]
WantedBy=multi-user.target

[root@zookeeper-node1 ~]#systemctl daemon-reload
[root@zookeeper-node1 ~]#systemctl restart zookeeper.service
[root@zookeeper-node1 ~]#systemctl status zookeeper.service