Compose 是用于定义和运行多容器 Docker 应用程序的工具。通过 Compose,您可以使用 YML 文件来配置应用程序需要的所有服务。然后,使用一个命令,就可以从 YML 文件配置中创建并启动所有服务。
Compose 使用的三个步骤:
如果你还不了解 YML 文件配置,可以先阅读 YAML 入门教程 。
docker-compose.yml 的配置案例如下(配置参数参考下文):
{ "name":"bigdata", "url":" http://www.lansonli.com ", "page":88, "address":{ "street":"科兴科技园", "city":"深圳市南山区", "country":"中国" }, "links":[ { "name":"Google", "url":" http://www.google.com " }, { "name":"Baidu", "url":" http://www.baidu.com " } ]}
以上 JSON 转为 Yaml 为
# 这是 yaml 注释 # key: value 基本键值对写法; yaml 使用缩进控制层次。 name: bigdataurl: 'http://www.lansonli.com'page: 88address: street: 科兴科技园 city: 深圳市南山区 country: 中国 links: - name: Google url: 'http://www.google.com' - name: Baidu url:
'http://www.baidu.com'
sudo curl -L https://github.com/docker/compose/releases/download/1.21.2/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose
docker-compose -v
docker-compose ps
docker-compose logs
docker-compose port eureka 8761
docker-compose build
docker-compose start eureka
docker-compose stop eureka
docker-compose rm eureka
docker-compose up
docker-compose kill eureka
docker-compose scale user=3 movie=3
docker-compose run web bash
build: ./dir---------------build: context: ./dir dockerfile: Dockerfile args: buildno: 1
command: bundle exec thin -p 3000----------------------------------command: [bundle,exec,thin,-p,3000]
dns: 8.8.8.8------------dns: - 8.8.8.8 - 9.9.9.9
dns_search: example.com------------------------dns_search: - dc1.example.com - dc2.example.com
environment: RACK_ENV: development SHOW: 'ture'-------------------------environment: - RACK_ENV=development - SHOW=ture
env_file: .env---------------env_file: - ./common.env
expose: - "3000" - "8000"
image: java
network_mode: "bridge"network_mode: "host"network_mode: "none"network_mode: "service:[service name]"network_mode: "container:[container name/id]"
ports: # 暴露端口信息 - "宿主机端口:容器暴露端口"- "8763:8763"- "8763:8763"
links: # 指定服务名称:别名 - docker-compose-eureka-server:compose-eureka
volumes: - /lib - /var
--no-color 单色输出,不显示其他颜.-f, --follow 跟踪日志输出,就是可以实时查看日志-t, --timestamps 显示时间戳--tail 从日志的结尾显示,--tail=200
mkdir composetest
创建 app.py
编写 compose 文件[compose.yaml] compose 文件名 docker-compose.yml, docker-compose.yaml, compose.yml, compose.yaml
version: "3.9" #指定版本号;查看文档 https://docs.docker.com/compose/compose-file/ services: #所有需要启动的服务 web: #第一个服务的名字 build: #docker build -t xxx -f Dockerfile . dockerfile: Dockerfile context: . image: 'hello:py' ports: #指定启动容器暴露的端口 - "5000:5000" redis: #第二个服务的名字 image: "redis:alpine" # mysqlserver: #第三个服务 #怎么执行的 Creating network "composetest_default" with the default driver Building web Sending build context to Docker daemon 5.632kB Step 1/10 : FROM python:3.7-alpine 。。。。。。 Step 10/10 : CMD ["flask", "run"] ---> Running in 01e36491132c Removing intermediate container 01e36491132c ---> 47d09826ac6f Successfully built 47d09826ac6f Successfully tagged hello:py ======web镜像名 hello:py=== WARNING: Image for service web was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up -- build`. Pulling redis (redis:alpine)... ....... Status: Downloaded newer image for redis:alpine
使用命令进行后台执行
docker-compose up -d
version: "3.7" services: app: image: node:12-alpine command: sh -c "yarn install && yarn run dev" ports: - 3000:3000 working_dir: /app volumes: - ./:/app environment: MYSQL_HOST: mysql MYSQL_USER: root MYSQL_PASSWORD: secret MYSQL_DB: todos networks: - hello - world deploy: #安装docker swarm replicas: 6 #指定副本:处于不同的服务器(负载均衡+高可用) mysql: #可以代表一个容器,ping 服务名 mysql 可以访问 image: mysql:5.7 #负载均衡下,数据一致怎么做???主从同步,读写分离 volumes: - todo-mysql-data:/var/lib/mysql environment: MYSQL_ROOT_PASSWORD: secret MYSQL_DATABASE: todos networks: #这个服务加入那个自定义网络 - hello deploy: #安装docker swarm replicas: 6 #指定副本:处于不同的服务器(负载均衡+高可用) redis: image: redis networks: - world volumes: todo-mysql-data: networks: hello: world:
两句总结:
控制台打印
docker swarm join --token SWMTKN-1-1i0biktih9tfn7mrj6asn27em4vydg8pp00u930nrycpgct1ww-7ecs32nl5f5y8qx6e5lp4f064 10.120.82.4:2377
docker swarm join --token SWMTKN-1-1i0biktih9tfn7mrj6asn27em4vydg8pp00u930nrycpgct1ww-7ecs32nl5f5y8qx6e5lp4f064 10.120.82.4:2377 思考:k8s 怎么解决: helm 把整个应用的部署打成应用包,helm install mysql(主从)
页面更新:2024-05-14
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