Zookeeper

Clustered (Multi-Server) Setup Script

Note
 Refer to ZooKeeper Setup for more information.

安装

1. ZooKeeper ensemble machine preparation
# for i in 1 2 3 ; do ssh zk-$i 'hostname ; cat /etc/redhat-release ; sleep 1' ;done
zk-1
CentOS Linux release 7.9.2009 (Core)
zk-2
CentOS Linux release 7.9.2009 (Core)
zk-3
CentOS Linux release 7.9.2009 (Core)
2. Java JDK Installation
for i in 1 2 3 ; do ssh zk-$i 'yum install java-11-openjdk-devel -y' ;done
for i in 1 2 3 ; do ssh zk-$i 'java --version' ;done
3. ZooKeeper Server Installation
for i in 1 2 3 ; do ssh zk-$i 'tar -xzvf apache-zookeeper-3.6.2-bin.tar.gz -C /opt/' ;done
4. Configuration
for i in 1 2 3 ; do ssh zk-$i 'mkdir /var/lib/zookeeper/' ;done

ssh zk-1 'echo 1 > /var/lib/zookeeper/myid'
ssh zk-2 'echo 2 > /var/lib/zookeeper/myid'
ssh zk-3 'echo 3 > /var/lib/zookeeper/myid'

for i in 1 2 3 ; do ssh zk-$i 'cat /var/lib/zookeeper/myid' ;done
1
2
3

// execute the following commands in all 3 machines
cat << EOF > /opt/apache-zookeeper-3.6.2-bin/conf/zoo.cfg
tickTime=2000
dataDir=/var/lib/zookeeper/
clientPort=2181
initLimit=10
syncLimit=5
server.1=zk-1:2888:3888
server.2=zk-2:2888:3888
server.3=zk-3:2888:3888
EOF
5. Start and check running status
for i in 1 2 3 ; do ssh zk-$i '/opt/apache-zookeeper-3.6.2-bin/bin/zkServer.sh start' ;done
for i in 1 2 3 ; do ssh zk-$i '/opt/apache-zookeeper-3.6.2-bin/bin/zkServer.sh status' ;done
6. 安装验证
cat /opt/apache-zookeeper-3.6.2-bin/logs/zookeeper-root-server-zk-3.out

运维管理

HTTP

浏览器访问 http://10.1.10.6:8080/commands 查看所有可通过 HTTP 操作的命令

示例：/commands/voting_view 查看所有可参与选举的节点
{
  "current_config" : {
    "1" : {
      "server_addresses" : [ "zk-1:2888" ],
      "election_addresses" : [ "zk-1:3888" ],
      "client_address" : "0.0.0.0:2181",
      "learner_type" : "participant"
    },
    "2" : {
      "server_addresses" : [ "zk-2:2888" ],
      "election_addresses" : [ "zk-2:3888" ],
      "client_address" : "",
      "learner_type" : "participant"
    },
    "3" : {
      "server_addresses" : [ "zk-3:2888" ],
      "election_addresses" : [ "zk-3:3888" ],
      "client_address" : "",
      "learner_type" : "participant"
    }
  },
  "command" : "voting_view",
  "error" : null
}
示例：/commands/leader 查看集群 Leader
{
  "is_leader" : false,
  "leader_id" : 2,
  "leader_ip" : "zk-2",
  "command" : "leader",
  "error" : null
}

CLI

Commands Notes 
./zkCli.sh -server 10.1.10.7:2181

客户端连接 ensemble 节点

 
help

查看所有命令

 
ls /

查看当前节点数据

 
create /test "value"
create /test/subpath "value 2"

创建节点

 
get /test
get /test/subpath

查看节点数据

 
set /test "value-1"

修改节点数据

 
delete /test/subpath
delete /test

删除节点

 
stat /

查看状态

 
quit

退出命令行

Java Client

Get code
git clone https://github.com/cloudadc/distribute-dev-framework.git
Build
cd distribute-dev-framework/zookeeper/
mvn clean install
Run
java -jar java-client/target/zookeeper-java-client-0.0.1.jar 10.1.10.6:2181,10.1.10.7:2181,10.1.10.8:2181

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