创建 HELLO WORLD
在目录下,创建Dockerfile, 写入如下命令
FROM alpine:latest
MAINTAINER itaken
CMD echo "HELLO WORLD"
说明: alpine是非常小的linx镜像
使用docker build创建镜像
$ docker build -f Dockerfile -t itaken/hello_docker .
Sending build context to Docker daemon 2.048 kB
Step 1/3 : FROM alpine:latest
latest: Pulling from library/alpine
ff3a5c916c92: Pull complete
Digest: sha256:7df6db5aa61ae9480f52f0b3a06a140ab98d427f86d8d5de0bedab9b8df6b1c0
Status: Downloaded newer image for alpine:latest
---> 3fd9065eaf02
Step 2/3 : MAINTAINER itaken
---> Running in 4cea7327d9c9
---> 99d8f67ca624
Removing intermediate container 4cea7327d9c9
Step 3/3 : CMD echo "HELLO WORLD"
---> Running in abb196bfc38d
---> cb57a2eb20fa
Removing intermediate container abb196bfc38d
Successfully built cb57a2eb20fa说明:t表示标签, .表示路径
查看image是否成功
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
itaken/hello_docker latest cb57a2eb20fa 6 minutes ago 4.15 MB
$ docker run hello_docker
HELLO WORLD创建复杂点的镜像
FROM ubuntu
MAINTAINER itaken
RUN apt update
RUN apt install -y nginx
COPY index.html /var/www/html
ENTRYPOINT ["/usr/sbin/nginx", "-g", "daemon off;"]
EXPOSE 80创建index.html,写入HELLO WORLD
语法说明
- FROM base image
- RUN 执行命令
- ADD 添加文件
- COPY 拷贝文件
- CMD 执行命令
- EXPOSE 暴露端口
- WORKDIR 指定路径
- MAINTAINER 维护者
- ENV 设定环境变量
- ENTRYPOINT 容器入口
- USER 指定用户
- VOLUME mount point
查看是否成功
$ docker run -d -p 81:80 itaken/hello_nginx
3042061e3c2f40771289161227c04c23c20cd36c155f7f2596140bd6ba101a35
$ curl http://localhost:81
HELLO WORLD
