Docker多容器实践
今天参考《docker第一本书》做了一个多容器实践，其架构为：1.一个Node容器，实现一个简单的web服务
2.一个Redis master，两个Redis slave
3.一个logstash监控日志
一.部署node.js
通过wget下载https://raw.githubusercontent.com/jamtur01/dockerbook-code/master/code/6/node/nodejs/nodeapp/package.json和https://raw.githubusercontent.com/jamtur01/dockerbook-code/master/code/6/node/nodejs/nodeapp/server.js
其中server.js会启动Express，然后把session存放至host名为redis_primary的redis里面
Dockerfile:
FROM ubuntu:14.04
RUN apt-get -yqq update
RUN apt-get -yqq install nodejs npm
RUN ln -s /usr/bin/nodejs /usr/bin/node
RUN mkdir -p /var/log/nodeappADD nodeapp /opt/nodeapp/
WORKDIR /opt/nodeapp
RUN npm install
VOLUME [“/var/log/nodeapp”]
EXPOSE 3000
ENTRYPOINT [“nodejs”,”server.js”]
构建镜像：docker build -t learn01/nodejs .
二.部署redis基础镜像
Dockerfile:
FROM ubuntu:14.04
RUN apt-get -yqq update
RUN apt-get install -yqq software-properties-common python-software-properties
RUN add-apt-repository ppa:chris-lea/redis-server
RUN apt-get -yqq update
RUN apt-get -yqq install redis-server redis-tools
VOLUME [“/var/lib/redis”,”/var/log/redis/”]
EXPOSE 6379
CMD []
构建：docker build -t learn01/redis_base .
三.Redis主镜像
Dockerfile:
FROM learn01/redis_base
ENTRYPOINT [“redis-server”,”–logfile /var/log/redis/redis-server.log”]
构建：docker build -t learn01/redis_primary .
四.Redis从镜像
Dockerfile:
FROM learn01/redis_base
ENTRYPOINT [“redis-server”,”–logfile /var/log/redis/redis-replica.log”,”–slaveof redis_primary 6379”]
构建：docker build -t learn01/redis_replica .
五.创建redis集群
1）启动redis master
docker run -d -h redis_primary –name redis_primary learn01/redis_primary
查看其日志：
docker run -ti –rm –volumes-from redis_primary ubuntu cat /var/log/redis/redis-server.log
2）创建redis slave
docker run -d -h redis_replica1 –name redis_replica1 –link redis_primary:redis_primary learn01/redis_replica
docker run -d -h redis_replica2 –name redis_replica2 –link redis_primary:redis_primary learn01/redis_replica
查看slave日志：
docker run -ti –rm –volumes-from redis_replica1 ubuntu cat /var/log/redis/redis-replica.log
docker run -ti –rm –volumes-from redis_replica2 ubuntu cat /var/log/redis/redis-replica.log
六.创建Node容器
docker run -d –name nodeapp -p 3000:3000 –link redis_primary:redis_primary learn01/nodejs
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