Docker笔记三 Docker镜像制作

1.Docker镜像制作方法：

• docker commit 保存当前container的状态到镜像，生成p_w_picpath。

• docker build 利用dockerfile自动化生成p_w_picpath。

2.制作方法 docker commit方式

#启动镜像名称为centos的一个容器（container） [root@frog ~]#docker run -it centos /bin/bash#在容器内安装httpd服务[root@95a278b60b0f ~]#yum install httpd#退出容器[root@95a278b60b0f ~]#exit#查看当前容器的ID[root@frog ~]# docker ps -aCONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                      PORTS               NAMES95a278b60b0f        centos              "/bin/bash"         2 minutes ago       Exited (0) 53 seconds ago  #基于当前运行的容器（container），制作新镜像 httpd[root@frog ~]#docker commit 95a278b60b0f  centos:httpd  [root@frog ~]# docker commit 95a278b60b0f centos:helloworldsha256:30e20107209fd55cef87cdaa4b71a3ae4f64f7f051f88d523ea386aba24398f6
[root@frog ~]#docker p_w_picpathsREPOSITORY          TAG                 IMAGE ID            CREATED             SIZEcentos              httpd                   30e20107209f        6 seconds ago       193MBcentos              latest              3bee3060bfc8        8 days ago          193MB基于新创建的镜像helloworld 启动一个容器[root@frog ~]#docker run -it centos:httpd /bin/bash
[root@4f50f361c028 /]#systemctl start httpd完成制作并启动httpd进行了验证。

3.制作方法 docker build方式

#创建工作目录[root@frog /]# mkdir docker-build
[root@frog /]# cd docker-build/
[root@frog docker-build]# ls
[root@frog docker-build]# touch Dockerfile#编辑Dockerfile文件[root@frog docker-build]# vim Dockerfile FROM centos
MAINTAINER frog <frgtwo@163.com>
RUN yum -y install httpd
ADD httpStart.sh /usr/local/bin/httpStart.sh
ADD index.html /var/www/html/index.html#当前目录创建 httpStart.sh、index.html文件
#说明：/usr/sbin/httpd DFOREGROUND相当于 systemctl start httpd
[root@frog docker-build]# ls
Dockerfile
[root@frog docker-build]# echo "/usr/sbin/httpd DFOREGROUND" > httpdStart.sh
[root@frog docker-build]# echo "hello world" > index.html
[root@frog docker-build]# chmod a+x httpStart.sh
[root@frog docker-build]# ls
Dockerfile  httpStart.sh  index.html#使用build 命令创建centos:httpd 镜像[root@frog docker-build]# docker build -t centos:httpd . #这里的‘.’指Dockerfile文件路径#检查新创建的镜像文件centos:httpd[root@frog docker-build]# docker p_w_picpaths
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
centos              httpd               3062c6b1a8e8        3 minutes ago       318MB
centos              index               b11dfe564274        About an hour ago   193MB
centos              helloworld          30e20107209f        About an hour ago   193MB
centos              latest              3bee3060bfc8        9 days ago          193MB