Zookeeper 安装

Docker 部署 Zookeeper

单个实例

  • 官网仓库:https://hub.docker.com/r/library/zookeeper/
  • 单个实例:docker run -d --restart always --name one-zookeeper -p 2181:2181 -v /etc/localtime:/etc/localtime zookeeper:latest
    • 默认端口暴露是:This image includes EXPOSE 2181 2888 3888 (the zookeeper client port, follower port, election port respectively)
  • 容器中的几个重要目录(有需要挂载的可以指定):
    • /data
    • /datalog
    • /conf

单机多个实例(集群)

version: '3.1'

services:
  zoo1:
    image: zookeeper
    restart: always
    hostname: zoo1
    ports:
      - 2181:2181
    environment:
      ZOO_MY_ID: 1
      ZOO_SERVERS: server.1=0.0.0.0:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888

  zoo2:
    image: zookeeper
    restart: always
    hostname: zoo2
    ports:
      - 2182:2181
    environment:
      ZOO_MY_ID: 2
      ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=0.0.0.0:2888:3888 server.3=zoo3:2888:3888

  zoo3:
    image: zookeeper
    restart: always
    hostname: zoo3
    ports:
      - 2183:2181
    environment:
      ZOO_MY_ID: 3
      ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=0.0.0.0:2888:3888
  • 启动:docker-compose -f zookeeper.yml -p zk_test up -d
    • 参数 -p zk_test 表示这个 compose project 的名字,等价于:COMPOSE_PROJECT_NAME=zk_test docker-compose -f zookeeper.yml up -d
    • 不指定项目名称,Docker-Compose 默认以当前文件目录名作为应用的项目名
    • 报错是正常情况的。
  • 停止:docker-compose -f zookeeper.yml -p zk_test stop

先安装 nc 再来校验 zookeeper 集群情况

  • 环境:CentOS 7.4
  • 官网下载:https://nmap.org/download.html,找到 rpm 包
  • 当前时间(201803)最新版本下载:wget https://nmap.org/dist/ncat-7.60-1.x86_64.rpm
  • 安装:sudo rpm -i ncat-7.60-1.x86_64.rpm
  • ln 下:sudo ln -s /usr/bin/ncat /usr/bin/nc
  • 检验:nc --version

校验

  • 命令:echo stat | nc 127.0.0.1 2181,得到如下信息:
Zookeeper version: 3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0, built on 11/01/2017 18:06 GMT
Clients:
 /172.21.0.1:58872[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x100000000
Mode: follower
Node count: 4
  • 命令:echo stat | nc 127.0.0.1 2182,得到如下信息:
Zookeeper version: 3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0, built on 11/01/2017 18:06 GMT
Clients:
 /172.21.0.1:36190[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x500000000
Mode: follower
Node count: 4
  • 命令:echo stat | nc 127.0.0.1 2183,得到如下信息:
Zookeeper version: 3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0, built on 11/01/2017 18:06 GMT
Clients:
 /172.21.0.1:33344[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x500000000
Mode: leader
Node count: 4

多机多个实例(集群)

  • 三台机子:
    • 内网 ip:172.24.165.129,外网 ip:47.91.22.116
    • 内网 ip:172.24.165.130,外网 ip:47.91.22.124
    • 内网 ip:172.24.165.131,外网 ip:47.74.6.138
  • 修改三台机子 hostname:
    • 节点 1:hostnamectl --static set-hostname youmeekhost1
    • 节点 2:hostnamectl --static set-hostname youmeekhost2
    • 节点 3:hostnamectl --static set-hostname youmeekhost3
  • 三台机子的 hosts 都修改为如下内容:vim /etc/hosts
172.24.165.129 youmeekhost1
172.24.165.130 youmeekhost2
172.24.165.131 youmeekhost3
  • 节点 1:
docker run -d \
-v /data/docker/zookeeper/data:/data \
-v /data/docker/zookeeper/log:/datalog \
-e ZOO_MY_ID=1 \
-e "ZOO_SERVERS=server.1=youmeekhost1:2888:3888 server.2=youmeekhost2:2888:3888 server.3=youmeekhost3:2888:3888" \
--name=zookeeper1 --net=host --restart=always zookeeper
  • 节点 2:
docker run -d \
-v /data/docker/zookeeper/data:/data \
-v /data/docker/zookeeper/log:/datalog \
-e ZOO_MY_ID=2 \
-e "ZOO_SERVERS=server.1=youmeekhost1:2888:3888 server.2=youmeekhost2:2888:3888 server.3=youmeekhost3:2888:3888" \
--name=zookeeper2 --net=host --restart=always zookeeper
  • 节点 3:
docker run -d \
-v /data/docker/zookeeper/data:/data \
-v /data/docker/zookeeper/log:/datalog \
-e ZOO_MY_ID=3 \
-e "ZOO_SERVERS=server.1=youmeekhost1:2888:3888 server.2=youmeekhost2:2888:3888 server.3=youmeekhost3:2888:3888" \
--name=zookeeper3 --net=host --restart=always zookeeper

需要环境

  • JDK 安装

下载安装

  • 官网:https://zookeeper.apache.org/
  • 此时(201702)最新稳定版本:Release 3.4.9
  • 官网下载:http://www.apache.org/dyn/closer.cgi/zookeeper/
  • 我这里以:zookeeper-3.4.8.tar.gz 为例
  • 安装过程:
    • mkdir -p /usr/program/zookeeper/data
    • cd /opt/setups
    • tar zxvf zookeeper-3.4.8.tar.gz
    • mv /opt/setups/zookeeper-3.4.8 /usr/program/zookeeper
    • cd /usr/program/zookeeper/zookeeper-3.4.8/conf
    • mv zoo_sample.cfg zoo.cfg
    • vim zoo.cfg
  • 将配置文件中的这个值:
    • 原值:dataDir=/tmp/zookeeper
    • 改为:dataDir=/usr/program/zookeeper/data
  • 防火墙开放2181端口
    • iptables -A INPUT -p tcp -m tcp --dport 2181 -j ACCEPT
    • service iptables save
    • service iptables restart
  • 启动 zookeeper:sh /usr/program/zookeeper/zookeeper-3.4.8/bin/zkServer.sh start
  • 停止 zookeeper:sh /usr/program/zookeeper/zookeeper-3.4.8/bin/zkServer.sh stop
  • 查看 zookeeper 状态:sh /usr/program/zookeeper/zookeeper-3.4.8/bin/zkServer.sh status
    • 如果是集群环境,下面几种角色
      • leader
      • follower

集群环境搭建

确定机子环境

  • 集群环境最少节点是:3,且节点数必须是奇数,生产环境推荐是:5 个机子节点。
  • 系统都是 CentOS 6
  • 机子 1:192.168.1.121
  • 机子 2:192.168.1.111
  • 机子 3:192.168.1.112

配置

  • 在三台机子上都做如上文的流程安装,再补充修改配置文件:vim /usr/program/zookeeper/zookeeper-3.4.8/conf/zoo.cfg
  • 三台机子都增加下面内容:
server.1=192.168.1.121:2888:3888
server.2=192.168.1.111:2888:3888
server.3=192.168.1.112:2888:3888
  • 在 机子 1 增加一个该文件:vim /usr/program/zookeeper/data/myid,文件内容填写:1
  • 在 机子 2 增加一个该文件:vim /usr/program/zookeeper/data/myid,文件内容填写:2
  • 在 机子 3 增加一个该文件:vim /usr/program/zookeeper/data/myid,文件内容填写:3
  • 然后在三台机子上都启动 zookeeper:sh /usr/program/zookeeper/zookeeper-3.4.8/bin/zkServer.sh start
  • 分别查看三台机子的状态:sh /usr/program/zookeeper/zookeeper-3.4.8/bin/zkServer.sh status,应该会得到类似这样的结果:
Using config: /usr/program/zookeeper/zookeeper-3.4.8/bin/../conf/zoo.cfg
Mode: follower 或者 Mode: leader

Zookeeper 客户端工具

ZooInspector

zooweb

资料

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