Docker镜像创建的三种方式

一： Docker镜像分层
二 镜像创建
2.1 基于已有的镜像容器进行创建

[root@server1 ~]# docker ps -a
CONTAINER ID        IMAGE                 COMMAND             CREATED             STATUS              PORTS               NAMES
a0c6e70581d9        paigeeworld/centos7   "/bin/bash"         22 hours ago        Up 22 hours                             lucid_napier
6e7caa304845        paigeeworld/centos7   "/bin/bash"         22 hours ago        Up 22 hours                             loving_spence
[root@server1 ~]# docker commit -m "new" -a "docker" a0c6e70581d9 docker:test
sha256:b15cf040c4fb83f1a6bb8bbb2ba735352293bfb78180b0078e99d907a8d0fc8f
[root@server1 ~]# docker images
REPOSITORY            TAG                 IMAGE ID            CREATED             SIZE
docker                test                b15cf040c4fb        12 seconds ago      382MB
nginx                 web                 6cf674b9866c        21 hours ago        355MB

2.2 基于本地模板创建

cat debian-7.0-x86-minimal.tar.gz | docker import - docker:new

2.3 基于Dockerfile创建（附Docker基本操作命令）

root@server1 ~]# cd /opt
[root@server1 opt]# mkdir apache #创建apache目录
[root@server1 opt]# cd apache    #进入
[root@server1 apache]# vim Dockerfile  #编辑docker容器
FROM centos:7
MAINTAINER alis
RUN yum -y update
RUN yum -y install httpd
EXPOSE 80 #打开端口
ADD index.html /var/www/html/index.html
ADD run.sh /run.sh
RUN chmod 755 /run.sh
CMD ["/run.sh"]

[root@server1 apache]# vim run.sh 
#!/bin/bash
rm -rf /run/httpd/*
exec /usr/sbin/apachectl -D FOREGROUND

[root@server1 apache]# echo "this is web test" > index.html
[root@server1 apache]# docker build -t httpd:centos . #生成镜像 这里有个 .
[root@server1 apache]# docker ps -a
CONTAINER ID        IMAGE                 COMMAND             CREATED             STATUS              PORTS               NAMES
a0c6e70581d9        paigeeworld/centos7   "/bin/bash"         22 hours ago        Up 22 hours                             lucid_napier
6e7caa304845        paigeeworld/centos7   "/bin/bash"         22 hours ago        Up 22 hours                             loving_spence
[root@server1 apache]# iptables -F
[root@server1 apache]# setenforce 0
[root@server1 apache]# docker run -d -p 1216:80 httpd:centos #运行新容器