制作自己的镜像(二)

使用dockerfile

docker commit方式创建镜像比较直观.但是不容易分发共享.还有种方法比较常用,就是使用dockerfile

新建两个目录,创建两个文件

[root@srv00 ~]# mkdir df && cd df[root@srv00 df]# cat nginx.repo [nginx]name=nginx repobaseurl=http://nginx.org/packages/centos/7/$basearch/gpgcheck=0enabled=1[root@srv00 df]# cat Dockerfile FROM centos:latestMAINTAINER hippo 
    
     COPY nginx.repo /etc/yum.repos.d/RUN yum install -y nginx && echo "daemon off;" >> /etc/nginx/nginx.conf EXPOSE 80CMD ["nginx"]
    

Dockerfile是默认文件名,docker build -f来指定自定义文件 一行一条指令.有点像shell. FROM基于哪个镜像.MAINTAINER维护者信息.COPY将本地文件copy到镜像目录中. RUN在镜像中运行的命令. EXPOSE暴露端口号给外部映射.CMD如果运行容器会执行的命令.(控制台执行.不然容器会马上退出).

运行docker build

[root@srv00 df]# docker build -t hippo/nginx:v1 .Sending build context to Docker daemon 3.072 kBStep 1 : FROM centos:latest ---> 8596123a638eStep 2 : MAINTAINER hippo 
    
      ---> Using cache ---> c04988102337Step 3 : COPY nginx.repo /etc/yum.repos.d/ ---> 840a6358f3d1Removing intermediate container 8cb81de3f7e9Step 4 : RUN yum install -y nginx && echo "daemon off;" >> /etc/nginx/nginx.conf ---> Running in 5a27d8a4bc77Loaded plugins: fastestmirror, ovl......Complete! ---> 45b53927ed9aRemoving intermediate container 5a27d8a4bc77Step 5 : EXPOSE 80 ---> Running in f022d6097efa ---> 29429605ebc7Removing intermediate container f022d6097efaStep 6 : CMD nginx ---> Running in c7faa5042715 ---> 2e1513eeaa0aRemoving intermediate container c7faa5042715Successfully built 2e1513eeaa0a
    

每条指令都相当于git commit一次.

运行测试下

[root@srv00 df]# docker run -d -p 80 hippo/nginx:v1dead20777b6c1609ab968966b3589904d44f8a12c124c178fd5cb540052cce6f[root@srv00 df]# docker ps CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                     NAMESdead20777b6c        hippo/nginx:v1      "nginx"                  11 seconds ago      Up 8 seconds        0.0.0.0:32771->80/tcp     gloomy_cray[root@srv00 df]# curl -L localhost:32771......

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