运维之我的docker
很多时候大家不同的容器想要不用启动参数这个时候不妨使用脚本封装来实现，官方也很推荐这个做法，这里介绍下如何使用脚本传参快速启动一个zookeeper集群。zookeeper集群大家知道有部分通用配置，和一些动态配置如果用一个简单的zookeeper实例无法正常启动集群，所以我们的节点列表和节点ID是需要动态传入的所以下面的脚本的${ZK_ID}和${ZK_LIST}是需要你使用compose的配置传入的。
zookeeper启动脚本
https://code.aliyun.com/nginxs/docker/blob/master/pkg/zookeeper/docker-entrypoint.sh
# cat zookeeper/docker-entrypoint.sh
#!/bin/bash
#######################################################
# author : baishaohua #
# mail: nginxs@126.com
#
# blog: new.nginxs.net
#
# msg : startup zookeeper cluster for docker #
#######################################################
#Shell Base Env
ZK_HOME="/usr/local/zookeeper"
ZK_CONF="${ZK_HOME}/conf/zoo.cfg"
ZK_DATA="/var/lib/zookeeper"
ZK_CONF_TXT="tickTime=2000\ninitLimit=10\nsyncLimit=5\ndataDir=${ZK_DATA}\nclientPort=2181"
echo "zookeeper is start"
#init config
echo -e ${ZK_CONF_TXT} >${ZK_CONF}
#ZK_NODE_LIST from docker argv
for i in ${ZK_NODE_LIST}
do
echo "$i" >>${ZK_CONF}
done
echo "${ZK_ID}" >${ZK_DATA}/myid
#this shell main function
${ZK_HOME}/bin/zkServer.sh start-foreground
Dockerfile文件配置
# cat zookeeper/Dockerfile
FROM registry.cn-hangzhou.aliyuncs.com/forker/centos7:last
MAINTAINER baishaohua
#start up configure 下面自动把zookeeper安装包安装到/usr/local/zookeeper目录
ADD zookeeper-3.5.1-alpha.tar.gz /usr/local/
RUN mv /usr/local/zookeeper-3.5.1-alpha /usr/local/zookeeper && mkdir -p /var/lib/zookeeper/
RUN yum -y install make gcc libgcc gcc-c++ glibc-devel java-1.8.0-openjdk
COPY docker-entrypoint.sh /usr/bin/
#ENV and CMD 配置容器默认启动脚本和开放2181端口
CMD ["/usr/bin/docker-entrypoint.sh"]
EXPOSE 2181
重点来了我们要从docker-compose.yml传参到启动脚本
下面通过environment定义环境变量把参数传递到容器的启动脚本，完成自定义部分内容
https://code.aliyun.com/nginxs/docker/blob/master/pkg/zk_cluster/docker-compose.yml
# cat zk_cluster/docker-compose.yml
version: '3'
services:
zk1:
image: registry.cn-hangzhou.aliyuncs.com/forker/zookeeper
restart: always
container_name: zk1
ports:
- "2181:2181"
environment:
ZK_ID: 1
ZK_NODE_LIST: server.1=zk1:3181:4181 server.2=zk2:3181:4181 server.3=zk3:3181:4181
zk2:
image: registry.cn-hangzhou.aliyuncs.com/forker/zookeeper
restart: always
container_name: zk2
ports:
- "2182:2181"
environment:
ZK_ID: 2
ZK_NODE_LIST: server.1=zk1:3181:4181 server.2=zk2:3181:4181 server.3=zk3:3181:4181
zk3:
image: registry.cn-hangzhou.aliyuncs.com/forker/zookeeper
restart: always
container_name: zk3
ports:
- "2183:2181"
environment:
ZK_ID: 3
ZK_NODE_LIST: server.1=zk1:3181:4181 server.2=zk2:3181:4181 server.3=zk3:3181:4181
启动我的compose服务
这里可以看到其实zk1,zk2,zk3每个都是一个service，而且compose会为这个应用创建一个默认的桥接网络
# docker-compose up -d
WARNING: The Docker Engine you're using is running in swarm mode.
Compose does not use swarm mode to deploy services to multiple nodes in a swarm. All containers will be scheduled on the current node.
To deploy your application across the swarm, use `docker stack deploy`.
Creating network "zkcluster_default" with the default driver
Creating zk3
Creating zk1
Creating zk2
测试zookeeper集群
# echo"conf"|nc localhost 2181
clientPort=2181
secureClientPort=-1
dataDir=/var/lib/zookeeper/version-2
dataDirSize=67109393
dataLogDir=/var/lib/zookeeper/version-2
dataLogSize=67109393
tickTime=2000
maxClientCnxns=60
minSessionTimeout=4000
maxSessionTimeout=40000
serverId=1
initLimit=10
syncLimit=5
electionAlg=3
electionPort=4181
quorumPort=3181
peerType=0
membership:
server.1=zk1:3181:4181:participant
server.2=zk2:3181:4181:participant
server.3=zk3:3181:4181:participant
version=100000000
下面是一些我写的其它帮助文档：
0. docker安装
[*]阿里云加速你的docker
[*]运行你第一个镜像实例-docker容器
[*]docker命令参数
[*]docker仓库使用和镜像提交
[*]docker镜像构建构建及参数详解
[*]docker镜像的导入导出
[*]docker的网络
[*]docker网络的测试示例
[*]docker数据卷
[*]docker的api和python sdk
[*]单机多容器的编排-compose
[*]docker-swarm集群的管理-swarm
[*]docker-swarm集群管理详解
[*]docker-swarm集群中删除节点和服务
[*]docker自建仓库Registry
使用技巧和推荐
[*]docker集群web页面管理工具
[*]不要再给你的docker安装ssh server
[*]compose快速创建zookeeper集群
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