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Docker : Use Dockerfile#2
2015/06/27 |
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Use Dockerfile and create Docker images automatically.
It is also useful for configuration management. |
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| [1] | For example, Create a Dockerfile to install httpd and add index.html. |
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[root@dlp ~]#
vi Dockerfile # create new FROM centos MAINTAINER serverworld <admin@srv.world> RUN yum -y install httpd RUN echo "Hello DockerFile" > /var/www/html/index.html CMD which httpd # build image ⇒ docker build -t [image name]:[tag] [root@dlp ~]# docker build -t serverworld/httpd:v1.0 . Sending build context to Docker daemon 10.24 kB Step 0 : FROM centos ---> 7322fbe74aa5 Step 1 : MAINTAINER serverworld <admin@srv.world> ---> Running in fa5364b3d41f ---> 57d8fd36b7f7 ..... ..... Removing intermediate container 6c41d45193a7 Successfully built 277e531b42be[root@dlp ~]# docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE serverworld/httpd v1.0 4085b96acc22 4 seconds ago 268.4 MB centos latest 7322fbe74aa5 8 days ago 172.2 MB centos 7 7322fbe74aa5 8 days ago 172.2 MB centos centos7 7322fbe74aa5 8 days ago 172.2 MB # execute without arguments, then the command specified by CMD is executed [root@dlp ~]# docker run serverworld/httpd:v1.0 /usr/sbin/httpd # execute with arguments, then the command specified by CMD is overwritten and the arguments is executed [root@dlp ~]# docker run serverworld/httpd:v1.0 /usr/bin/cat /var/www/html/index.html Hello DockerFile |