zookeeper-ansible

1. 通过ansible自动化安装zookeeper的docker集群
2. 确保zookeeper集群节点数为2N+1
3. 目前仅支持Centos7.x版本
4. zookeeper 镜像版本为 docker.io/zookeeper:3.4.13
5. 因为集群间各容器使用随机端口进行心跳检查,存在从容器中访问其他节点容器不通的情况。本文直接使用host网络模式解决节点间不通的问题

Configuration vars/zk.yml

1、更新vars/zk.yml中的 mount_path 宿主机挂载目录

env path

mount_path: "/data/zookeeper" #zookeeper宿主机挂载目录

2、指定vars/zk.yml中容器启动的端口

zookeeper port

client_port: 2181 leader_port: 2888 vote_port: 3888 jmx_port: 11911 random_port: "30001-65006" #heartbeat port

3、指定用户、组

zookeeper user

user: "zookeeper" group: "zookeeper"

4、指定主机组名 [与host中配置一致]

host group

zk_hosts: zookeeper # the group define in hosts

---

#主机组文件 1、hosts中指定集群机器 [zookeeper] 192.168.xx.xx 192.168.xx.xx 192.168.xx.xx

[zookeeper:vars] ansible_ssh_user=xxx ansible_ssh_pass=xxx ansible_ssh_port=xxx

Install

1. check zookeeper.yml
2. install_zk, config_zk, add_user, open_firewall 修改为false即可取消执行

---

• hosts: zookeeper

  user: root

  vars_files:

  • "vars/zk.yml"

  vars: config_zk: true # config zookeeper

  install_zk: true # install zookeeper

  add_user: true # add zookeeper user

  open_firewall: false # open firewall

  roles:

  • user # add user

  • zookeeper # zookeeper

3. 安装zookeeper集群

ansible-playbook -i hosts zookeeper.yml

docker zookeeper
environment:
  ZOO_MY_ID: 1
  ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888

mount:
  /data
  /conf
  /datalog


  docker run -d -v /data/zookeeper/data:/data -v /data/zookeeper/conf/:/conf -v /data/zookeeper/datalog:/datalog -e ZOO_SERVERS="server.1=ip:2888:3888" -e ZOO_MY_ID=1 -p 2181:2181 -p 2888:2888 -p 3888:3888 --name zook1 docker.io/zookeeper:3.4.13

  检查节点状态
  echo ruok|nc host_ip 2181  -> imok

  echo stats|nc host_ip 2181
  Zookeeper version: 3.4.13-2d71af4dbe22557fda74f9a9b4309b15a7487f03, built on 06/29/2018 04:05 GMT
Clients:
 /172.17.0.1:47970[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x0
Mode: standalone
Node count: 4

主机组中各主机需要安装docker及playbook使用的docker-py模块
yum install -y yum-utils \
  device-mapper-persistent-data \
  lvm2
yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo
yum install docker-ce docker-ce-cli containerd.io

#安装pip
python install python-pip -y

#安装docker-py module
pip install docker-py