Docker Compose
0x00 关于docker compose
可以把docker-compose当作docker命令的封装，它是一个用来把 docker 自动化的东西，docker-compose可以一次性管理多个容器，通常用于需要多个容器相互配合来完成某项任务的场景。
0x01 安装与卸载
https://docs.docker.com/compose/install
0x02 一些常用命令
- 构建容器：docker-compose up -d
- 启动容器：docker-compose start
- 停止容器：docker-compose stop
- 重启容器：docker-compose restart
- kill容器：docker-compose kill
- 删除容器：docker-compose rm
- bash连接容器：docker-compose exec [services_name] bash
- 执行一条命令：docker-compose run [services_name] [command]
0x03 docker-compose简单应用
-
结构
. ├── Dockerfile ├── docker-compose.yml └── src ├── app.py └── sources.list 1 directory, 4 files -
Dockerfile
FROM ubuntu:14.04.4 MAINTAINER reber <1070018473@qq.com> COPY ./src /code #将data挂载到容器的code WORKDIR /code RUN cp sources.list /etc/apt/sources.list && apt-get update RUN apt-get install -y python-dev python-pip RUN pip install flask redis CMD ["python","app.py"] -
docker-compose.yml(构建两个services)
version: '3' services: web: image: "dockercompose:test" #镜像名字和标签 build: . ports: - "8888:5000" #将容器的5000映射到本机的8888端口 volumes: - ./src:/code #挂载后更改本机文件时容器中的文件会随之改变，反之一样 links: - redis #links后在web中访问redis就可以通过redis这个名字来访问而不用通过ip，比如ping -c 2 redis redis: image: "redis:alpine" ports: - "3333:6379" -
app.py
import time import redis from flask import Flask app = Flask(__name__) cache = redis.Redis(host='redis', port=6379) def get_hit_count(): retries = 5 while True: try: return cache.incr('hits') except redis.exceptions.ConnectionError as exc: if retries == 0: raise exc retries -= 1 time.sleep(0.5) @app.route('/') def hello(): count = get_hit_count() return 'Hello World! I have been seen {} times.\n'.format(count) if __name__ == "__main__": app.run(host="0.0.0.0", debug=True) -
操作容器
[12:21 reber@wyb in ~/dockercomposetest] #构建并运行容器 ➜ docker-compose up -d Creating dockercomposetest_redis_1 ... Creating dockercomposetest_redis_1 ... done Creating dockercomposetest_web_1 ... Creating dockercomposetest_web_1 ... done #拉取了两个镜像ubuntu和redis，在此基础上生成镜像dockercompose:test ➜ docker images REPOSITORY TAG IMAGE ID CREATED SIZE dockercompose test c421a84a85a9 About an hour ago 415MB redis alpine 05635ee9e1c7 6 days ago 40.8MB ubuntu 14.04.4 0ccb13bf1954 2 years ago 188MB #生成两个容器 ➜ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES b1a5d90b0646 dockercompose:test "python app.py" 36 seconds ago Up 35 seconds 0.0.0.0:8888->5000/tcp dockercomposetest_web_1 364d6cf7ae50 redis:alpine "docker-entrypoint..." 36 seconds ago Up 35 seconds 0.0.0.0:3333->6379/tcp dockercomposetest_redis_1 #执行一条命令就会生成一个容器 ➜ docker-compose run web pwd Starting dockercomposetest_redis_1 ... done /code ➜ docker-compose run web ls Starting dockercomposetest_redis_1 ... done app.py sources.list ➜ docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 9b74c86f8f99 dockercompose:test "ls" 15 seconds ago Exited (0) 10 seconds ago dockercomposetest_web_run_2 6025c6379617 dockercompose:test "pwd" 20 seconds ago Exited (0) 19 seconds ago dockercomposetest_web_run_1 b1a5d90b0646 dockercompose:test "python app.py" 9 minutes ago Up 9 minutes 0.0.0.0:8888->5000/tcp dockercomposetest_web_1 364d6cf7ae50 redis:alpine "docker-entrypoint..." 9 minutes ago Up 9 minutes 0.0.0.0:3333->6379/tcp dockercomposetest_redis_1 #查看运行情况 ➜ curl http://127.0.0.1:8888 Hello World! I have been seen 3 times. ➜ redis-cli -h 127.0.0.1 -p 3333 127.0.0.1:3333> keys * 1) "hits" 127.0.0.1:3333> get hits "3" 127.0.0.1:3333> exit -
常用命令
[12:31 reber@wyb in ~/dockercomposetest] ➜ docker-compose up -d Creating dockercomposetest_redis_1 ... Creating dockercomposetest_redis_1 ... done Creating dockercomposetest_web_1 ... Creating dockercomposetest_web_1 ... done ➜ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d8b6270f1b63 dockercompose:test "python app.py" 7 seconds ago Up 6 seconds 0.0.0.0:8888->5000/tcp dockercomposetest_web_1 4d1965d53fe5 redis:alpine "docker-entrypoint..." 7 seconds ago Up 6 seconds 0.0.0.0:3333->6379/tcp dockercomposetest_redis_1 ➜ docker-compose stop Stopping dockercomposetest_web_1 ... done Stopping dockercomposetest_redis_1 ... done [12:31 reber@wyb in ~/dockercomposetest] ➜ docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 0582adca2a2d dockercompose:test "python app.py" 12 seconds ago Exited (0) 7 seconds ago dockercomposetest_web_1 1f8417160da3 redis:alpine "docker-entrypoint..." 12 seconds ago Exited (0) 6 seconds ago dockercomposetest_redis_1 ➜ docker-compose rm Going to remove dockercomposetest_web_1, dockercomposetest_redis_1 Are you sure? [yN] y Removing dockercomposetest_web_1 ... done Removing dockercomposetest_redis_1 ... done ➜ docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0x04 构建tomcat实例
➜ tree
.
├── Dockerfile
├── docker-compose.yml
├── src
│ ├── apache-tomcat-8.0.53.tar.gz
│ ├── jdk-8u181-linux-x64.tar.gz
│ └── sources.list
└── web
└── index.jsp
2 directories, 6 files
➜ cat Dockerfile
FROM ubuntu:14.04.4
MAINTAINER reber <1070018473@qq.com>
COPY ./src /data
WORKDIR /data
RUN cp sources.list /etc/apt/sources.list && apt-get update
RUN tar -zxvf apache-tomcat-8.0.53.tar.gz && mv apache-tomcat-8.0.53 /opt
RUN tar -zxvf jdk-8u181-linux-x64.tar.gz && mv jdk1.8.0_181 /opt
RUN rm -rf /data
ENV JAVA_HOME="/opt/jdk1.8.0_181"
ENV JAVA_BIN="$JAVA_HOME/bin"
ENV CLASSPATH="$JAVA_HOME/lib"
ENV PATH="$JAVA_HOME/bin":$PATH
WORKDIR /opt/apache-tomcat-8.0.53/webapps/ROOT
ENTRYPOINT ["tail","-f","/dev/null"] #使容器一直运行，不自动退出
➜ cat docker-compose.yml
version: '3'
services:
tomcat:
image: ubuntu:tomcat
build: .
ports:
- "8888:8080"
volumes:
- ./web:/opt/apache-tomcat-8.0.53/webapps/ROOT