镜像制作：

• 第一种：docker commit

语法： docker commit <container ID/image_name> <新镜像名>

例：创建含ftp的镜像

1、创建实例并安装ftp

[root@localhost ~]# docker run -it --name centos_ftp docker.io/centos:latest bash

[root@7bce31aa8914 /]# yum -y install vsftpd

2、创建ftp镜像

[root@localhost ~]# docker commit centos_ftp docker.io/centos:ftp
sha256:66b72f7bcd98e2e343e68e64a415de0b5ad99af3e6e7b15a7f40387369479016

[root@localhost ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/centos ftp 66b72f7bcd98 39 seconds ago 282 MB
docker.io/centos latest 49f7960eb7e4 4 weeks ago 200 MB

• 第二种：docker build

语法：docker build -t <父镜像名:标签> <Dockerfile文件路径>

1、创建Dockerfile

[root@localhost ~]# mkdir /docker-build

[root@localhost ~]# vim /docker-build/Dockerfile
FROM docker.io/centos:latest
MAINTAINER <lnhxzwb@126.com>
RUN yum -y install httpd
RUN echo "/usr/sbin/httpd -DFOREGROUND" > /usr/local/bin/http.sh
RUN echo "docker image build" > /var/www/html/index.html
RUN chmod 755 /usr/local/bin/http.sh
CMD /usr/local/bin/http.sh

注：CMD只能一个，多个时只执行最后一个，docker 1.3（不含1.3）之前版本命令需[ ]括起来

2、创建镜像

[root@localhost ~]# docker build -t docker.io/centos:httpd /docker-build/
Step 1/7 : FROM docker.io/centos:latest
 ---> 49f7960eb7e4
......
Step 7/7 : CMD /usr/local/bin/http.sh
 ---> Running in 906ae36c8aab
 ---> 75e255961f28
Removing intermediate container 906ae36c8aab
Successfully built 75e255961f28

[root@localhost docker-build]# docker images
 REPOSITORY TAG IMAGE ID CREATED SIZE
 docker.io/centos httpd 75e255961f28 53 seconds ago 314 MB
 docker.io/centos ftp 66b72f7bcd98 24 minutes ago 282 MB
 docker.io/centos latest 49f7960eb7e4 4 weeks ago 200 MB

镜像发布：

• 第一种：Save Image To TarBall

语法：docker save -o <导出的镜像名.tar> <本地镜像名:标签>

[root@localhost ~]# docker save -o docker.io-centos-httpd-image.tar docker.io/centos:httpd

[root@localhost ~]# ll -h
 -rw------- 1 root root 309M Jul 4 11:26 docker.io-centos-httpd-image.tar

• 第二种：发布到docker hub

1、在https://hub.docker.com上注册用户

2、登陆hub

语法： docker login -u <用户名> -p <密码> -e <mail>

3、上传

语法：docker push <镜像名:标签>

[root@localhost ~]# docker push docker.io/centos:httpd