详解使用Dockerfile创建带Apache服务的CentOS Docker镜像

使用Dockerfile创建带Apache服务的CentOS Docker镜像

在宿主机上准备的文件清单：

Dockerfile

#启动ssh和apache服务的角本run.sh

以上文件都放到/root/apache_centos目录下

mkdir -p /root/apache_centoscd /root/apache_centos

基础镜像：以镜像centos为基础的开放SSH服务的镜像

[root@localhost apache_centos]# docker imagesREPOSITORY     TAG         IMAGE ID      CREATED       VIRTUAL SIZEsshd        dockerfile     411d5fb16366    23 hours ago    278 MBcentos       latest       0f73ae75014f    5 weeks ago     172.3 MB

一、准备run.sh文件

在/root/apache_centos目录新建run.sh

vim run.sh

内容如下：

#!/bin/bash/usr/sbin/sshd &/usr/local/apache2/bin/httpd -D FOREGROUND

二、准备Dockerfile

在/root/apache_centos目录新建Dockerfile

vim Dockerfile

文件内容如下：

#新生成的镜像是基于sshd:dockerfile镜像FROM sshd:dockerfileMAINTAINER by Steven#安装wgetRUN yum install -y wgetWORKDIR /usr/local/src#下载并解压源码包RUN wget http://apache.fayea.com/httpd/httpd-2.4.17.tar.gzRUN tar -zxvf httpd-2.4.17.tar.gzWORKDIR httpd-2.4.17#编译安装apacheRUN yum install -y gcc make apr-devel apr apr-util apr-util-devel pcre-develRUN ./configure --prefix=/usr/local/apache2 --enable-mods-shared=most --enable-soRUN makeRUN make install#修改apache配置文件RUN sed -i 's/#ServerName www.example.com:80/ServerName localhost:80/g' /usr/local/apache2/conf/httpd.conf#启动apache服务RUN /usr/local/apache2/bin/httpd#复制服务启动脚本并设置权限ADD run.sh /usr/local/sbin/run.shRUN chmod 755 /usr/local/sbin/run.sh#开放80端口EXPOSE 80CMD ["/usr/local/sbin/run.sh"]

需要注意的是：在Dockerfile文件中更换当前目录不可以用“cd”命令，而要改用“WORKDIR”.

三、生成镜像

docker build -t apache_dockerfile:centos .

查看生成的镜像：

[root@localhost apache_centos]# docker imagesREPOSITORY     TAG         IMAGE ID      CREATED       VIRTUAL SIZEapache_dockerfile  centos       f8f30b4a0ee8    24 minutes ago   440 MBapache       centos       f92c55dddd07    17 hours ago    423.9 MBsshd        dockerfile     411d5fb16366    23 hours ago    278 MBcentos       latest       0f73ae75014f    5 weeks ago     172.3 MB

四、根据镜像生成的容器并进行测试

1、生成新的容器

 docker run -d -p 2222:22 -p 8000:80 apache_dockerfile:centos /usr/local/sbin/run.sh

将容器的22端口和80端口分别映射到到宿主机上的2222端口和8000端口,并运行服务脚本。

2、查看新生成的容器：

[root@localhost apache_centos]# docker ps -aCONTAINER ID    IMAGE           COMMAND        CREATED       STATUS           PORTS                    NAMESae560e497f39    apache_dockerfile:centos  "/usr/local/sbin/run  45 seconds ago   Up 44 seconds        0.0.0.0:2222->22/tcp, 0.0.0.0:8000->80/tcp  condescending_bardeen6490cd244c10    apache:centos       "/usr/local/apache2/  17 hours ago    Exited (0) 17 hours ago                         loving_wright673e946b57e4    sshd:dockerfile      "/usr/local/sbin/run  18 hours ago    Exited (137) 17 hours ago                        reverent_bell