上一章我們主要講了映象的幾種構建方式，今天就來用dockerfile構建一下相應的映象

sshd的映象構建

• 1.需要有一個centos：7的映象

• [root@sshd ~]# docker images
  REPOSITORY   TAG       IMAGE ID       CREATED       SIZE
  centos       7         8652b9f0cb4c   4 weeks ago   204MB
  

• 2.建立工作目錄誰說的，將生成的金鑰對複製到此目錄下

• [root@sshd ~]# mkdir sshd/
  [root@sshd ~]# cd sshd/
  
  [root@sshd sshd]# ssh-keygen
  Generating public/private rsa key pair.
  Enter file in which to save the key (/root/.ssh/id_rsa): 
  Created directory '/root/.ssh'.
  Enter passphrase (empty for no passphrase): 
  Enter same passphrase again: 
  Your identification has been saved in /root/.ssh/id_rsa.
  Your public key has been saved in /root/.ssh/id_rsa.pub.
  The key fingerprint is:
  SHA256:yDX1FHHXBt+zr+s3GgvjYRCwY/+htSaGca0Ni9TUypY root@sshd
  The key's randomart image is:
  +---[RSA 2048]----+
  |       .  . +oo.o|
  |        o..o . o+|
  |       +oo ..  oo|
  |     ..o*.=     o|
  |      ooSE +   . |
  |      . * X o   .|
  |       o * X .  .|
  |        . = + oo.|
  |           . +=o.|
  +----[SHA256]-----+
  
  [root@sshd sshd]# cp /root/.ssh/id_rsa.pub ./
  
• 3.編寫sshd的dockerfile

• [root@sshd sshd]# vim Dockerfile
  [root@sshd sshd]# cat Dockerfile

  FROM centos:7
  MAINTAINER Carrie
  RUN yum install -y openssh-server net-tools openssh-devel lsof telnet
  RUN sed -i 's/UsePAM yes/UsePAM no/g' /etc/ssh/sshd_config && ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
  RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
  ADD id_rsa.pub /root/.ssh/authorized_keys
  
  EXPOSE 22
  CMD ["/usr/sbin/sshd" , "-D"]
  ~
• 4.構建映象

• [root@sshd sshd]# docker build -t sshd:new ./
  

• 5.成功生成映象

• [root@sshd sshd]# docker images
  REPOSITORY   TAG       IMAGE ID       CREATED          SIZE
  sshd         new       d944bc58cd88   27 seconds ago   294MB
  centos       7         8652b9f0cb4c   4 weeks ago      204MB
  

• 6.驗證是否能用ssh登入ssh的容器（成功）

• [root@sshd ~]# docker run -d -p 2222:22 --name=sshd-test  --restart=always sshd:new
  a6b70bcce60653d73f69398c6aea56b7e14f4e5005ab86a24ca26359e9d3d5bb
  [root@sshd ~]# ssh [email protected] -p 2222
  The authenticity of host '[192.168.2.111]:2222 ([192.168.2.111]:2222)' can't be established.
  RSA key fingerprint is SHA256:dBr4vL6x/nUflY1URKRDbjtnu5z8m3qIy3cXoR130qw.
  RSA key fingerprint is MD5:69:2c:3f:84:82:fa:07:55:8c:69:5e:40:b8:2b:2e:5c.
  Are you sure you want to continue connecting (yes/no)? yes
  Warning: Permanently added '[192.168.2.111]:2222' (RSA) to the list of known hosts.
  [root@a6b70bcce606 ~]# 
  

  　　

httpd的映象構建

• 1.建立目錄httpd,進入目錄建立Dockerfile

• [root@httpd httpd]# cat Dockerfile
  FROM centos:7
  MAINTAINER Carrie
  RUN yum install -y httpd && \
  echo dockerfile test > /var/www/html/index.html && \
  ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
  EXPOSE 80
  CMD ["httpd" , "-DFOPEGROUND"]

• 2.構建新的映象

• [root@httpd httpd]# docker build -t httpd:new ./
  

• 3.檢視映象構建成功

• [root@httpd httpd]# docker images
  REPOSITORY   TAG       IMAGE ID       CREATED          SIZE
  httpd        new       0b036468af6f   3 minutes ago    324MB
  sshd         new       d944bc58cd88   39 minutes ago   294MB
  centos       7         8652b9f0cb4c   4 weeks ago      204MB
  

• 4.檢測是否成功

nginx映象構建

• 1.建立目錄，編寫啟動指令碼

• [root@httpd ~]# mkdir nginx
  [root@httpd ~]# cd nginx/
  [root@httpd nginx]# vim run.sh
  [root@httpd nginx]# cat run.sh 
  #!/bin/bash
  /usr/local/nginx/sbin/nginx
  

  　　

• 2.建立Dockerfile

• [root@httpd nginx]# vim Dockerfile
  [root@httpd nginx]# cat Dockerfile

  FROM centos:7
  MAINTAINER Carrie
  RUN yum install -y wget proc-devel net-tools gcc zlib zlib-devel make openssh-devel pcre-devel
  RUN wget http://nginx.org/download/nginx-1.19.0.tar.gz
  RUN tar zxf nginx-1.19.0.tar.gz
  WORKDIR nginx-1.19.0
  RUN ./configure --prefix=/usr/local/nginx && make && make install
  EXPOSE 80
  RUN echo "daemon off;" >> /usr/local/nginx/conf/nginx.conf
  RUN ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
  WORKDIR /root/nginx
  ADD run.sh /run.sh
  RUN chmod 775 /run.sh
  CMD ["/run.sh"]

  　　

• 3.構建映象

• [root@httpd nginx]# docker build -t nginx:new ./
  

  　　

• 4.檢視映象

• [root@httpd nginx]# docker images 
  REPOSITORY   TAG       IMAGE ID       CREATED             SIZE
  nginx        new       868be11b3686   7 minutes ago       363MB
  

  　　

• 5.啟動容器，進行測試（成功）

• [root@httpd nginx]# docker run -d -p 8000:80 --name nginx-test --restart=always nginx:new
  b040750d52e4a1993e5a8153293745fe5e8a230afc6147abc82d0ea0cb2adc57