重温dockerfile&dockerCompose

复习dockerfile

将应用程序及其需要的系统函数库、环境、配置、依赖，打包

常用命令

https://docs.docker.com/engine/reference/builder/

案例

# 指定基础镜像
FROM ubuntu:16.04
# 配置环境变量，JDK的安装目录
ENV JAVA_DIR=/usr/local

# 拷贝jdk和java项目的包
COPY ./jdk8.tar.gz $JAVA_DIR/
COPY ./docker-demo.jar /tmp/app.jar

# 安装JDK
RUN cd $JAVA_DIR \
 && tar -xf ./jdk8.tar.gz \
 && mv ./jdk1.8.0_144 ./java8

# 配置环境变量
ENV JAVA_HOME=$JAVA_DIR/java8
ENV PATH=$PATH:$JAVA_HOME/bin

# 暴露端口
EXPOSE 8090
# 入口，java项目的启动命令
ENTRYPOINT java -jar /tmp/app.jar

上述的工作等价于

# 指定基础镜像
FROM java:8-alpine

# 拷贝jdk和java项目的包
COPY ./docker-demo.jar /tmp/app.jar

# 暴露端口
EXPOSE 8090
# 入口，java项目的启动命令
ENTRYPOINT java -jar /tmp/app.jar

dockerCompose

可以基于Compose文件，实现快速部署分布式应用

https://docs.docker.com/compose/compose-file/

案例

不建议docker中部署MySQL，仅作为案例！

version: "3.8"

services:
	mysql:
		image: mysql:5.7.25
		environment:
			MYSQL_ROOT_PASSWORD: root
        volumes:
        	- /tmp/mysql/data:/var/lib/mysql
        	- /tmp/mysql/conf/hmy.cnf:/etc/mysql/conf.d/hmy.cnf
	web:
		build: .
		ports:
			- 8090: 8090

安装

最简单的办法:

• 下载 docker-compose

• 拖入/usr/local/bin

• 添加执行权限chomod +x /usr/local/bin/docker-compose

实战

compose

version: "3.2"

services:
  nacos:
    image: nacos/nacos-server
    environment:
      MODE: standalone
    ports:
      - "8848:8848"
  mysql:
    image: mysql:5.7.25
    environment:
      MYSQL_ROOT_PASSWORD: 123
    volumes:
      - "$PWD/mysql/data:/var/lib/mysql"
      - "$PWD/mysql/conf:/etc/mysql/conf.d/"
  userservice:
    build: ./user-service
  orderservice:
    build: ./order-service
  gateway:
    build: ./gateway
    ports:
      - "10010:10010"

files

.
│  docker-compose.yml
│
├─gateway
│      app.jar
│      Dockerfile
│
├─mysql
│  ├─conf
│  │      hmy.cnf
│  │
│  └─data
│      │  ...
│      │
│      ├─cloud_order
│      │      ...
│      │
│      ├─cloud_user
│      │      ...
│      │
│      ├─mysql
│      │      ...
│      │
│      ├─performance_schema
│      │      ...
│      │
│      └─sys
│              ...
│
├─order-service
│      app.jar
│      Dockerfile
│
└─user-service
        app.jar
        Dockerfile

gateway.Dockerfile; order-service.Dockerfile; user-service.Dockerfile

FROM java:8-alpine
COPY ./app.jar /tmp/app.jar
ENTRYPOINT java -jar /tmp/app.jar

构建

docker-compose up -d

重启服务

docker-compose restart gateway userservice orderservice

关闭服务（不销毁）

docker-compose stop

# --------------------------------------------
# Stopping cloud-demo_nacos_1        ... done
# Stopping cloud-demo_gateway_1      ... done
# Stopping cloud-demo_orderservice_1 ... done
# Stopping cloud-demo_userservice_1  ... done
# Stopping cloud-demo_mysql_1        ... done

查看日志

docker-compose logs -f