Docker之Dockerfile

1.DockerFile介绍

dockerfile是用来构建docker镜像的文件！
命令参数脚本！
构建步骤：
1、编写一个dockerfile文件
2、 docker build 构建称为一个镜像
3、 docker run运行镜像
4、 docker push发布镜像（DockerHub 、阿里云仓库)

但是很多官方镜像都是基础包，很多功能没有，我们通常会自己搭建自己的镜像！

2.DockerFile构建过程

基础知识：
1、每个保留关键字(指令）都是必须是大写字母
2、执行从上到下顺序
3、#表示注释
4、每一个指令都会创建提交一个新的镜像曾，并提交！

Dockerfile是面向开发的，我们以后要发布项目，做镜像，就需要编写dockerfile文件，这个文件十分简单！

Docker镜像逐渐成企业交付的标准，必须要掌握！
DockerFile：构建文 件，定义了一切的步骤，源代码
DockerImages：通过DockerFile构建生成的镜像，最终发布和运行产品。
Docker容器：容器就是镜像运行起来提供服务。

# DockerFile常用指令
FROM # 基础镜像，一切从这里开始构建
MAINTAINER # 镜像是谁写的， 姓名+邮箱
RUN # 镜像构建的时候需要运行的命令
ADD # 步骤，tomcat镜像，这个tomcat压缩包！添加内容 添加同目录
WORKDIR # 镜像的工作目录
VOLUME # 挂载的目录
EXPOSE # 保留端口配置
CMD # 指定这个容器启动的时候要运行的命令，只有最后一个会生效，可被替代。
ENTRYPOINT # 指定这个容器启动的时候要运行的命令，可以追加命令
onBUILD # 当构建一个被继承 DockerFile 这个时候就会运行ONBUILD的指令，触发指令。
COPY # 类似ADD，将我们文件拷贝到镜像中
ENV # 构建的时候设置环境变量！3.实战测试

3.实战测试

创建自己的镜像：

[root@iZwz92v9xcjopi734c76bdZ ~]# cd /home
[root@iZwz92v9xcjopi734c76bdZ home]# ls
xjszsd.java

# 在自己的home目录创建dockerfile
[root@iZwz92v9xcjopi734c76bdZ home]# mkdir dockerfile
[root@iZwz92v9xcjopi734c76bdZ home]# ls
dockerfile  xjszsd.java
[root@iZwz92v9xcjopi734c76bdZ home]# cd dockerfile
[root@iZwz92v9xcjopi734c76bdZ dockerfile]# ls

# 创建一个镜像
[root@iZwz92v9xcjopi734c76bdZ dockerfile]# vim df-centos

# 编辑镜像
[root@iZwz92v9xcjopi734c76bdZ dockerfile]# cat df-centos 
FROM centos:7 # 此处要加版本号，不然连不上网，默认是最新的centos8
MAINTAINER xjszsd<1670355220.qq.com>

ENV MYPATH /usr/local
WORKDIR $MYPATH


RUN yum  -y install vim
RUN yum  -y install net-tools

EXPOSE 80

CMD echo $MYPATH 
CMD echo  "---------xjszsd"
CMD /bin/bash

最后创建镜像

[root@iZwz92v9xcjopi734c76bdZ dockerfile]# docker build -f df-centos -t mycentos:0.1 .
Sending build context to Docker daemon   2.56kB
Step 1/10 : FROM centos:7
7: Pulling from library/centos
2d473b07cdd5: Pull complete 
Digest: sha256:9d4bcbbb213dfd745b58be38b13b996ebb5ac315fe75711bd618426a630e0987
Status: Downloaded newer image for centos:7
 ---> eeb6ee3f44bd
Step 2/10 : MAINTAINER xjszsd<1670355220.qq.com>
 ---> Running in ddbe4e2d8f08
Removing intermediate container ddbe4e2d8f08
 ---> 287552946690
Step 3/10 : ENV MYPATH /usr/local
 ---> Running in 879d5bd832ee
Removing intermediate container 879d5bd832ee
 ---> 65ecb77c9371
Step 4/10 : WORKDIR $MYPATH
 ---> Running in 3c3a86bc5582
Removing intermediate container 3c3a86bc5582
 ---> 505774b9eb18
Step 5/10 : RUN yum -y install vim
 ---> Running in c633f2668a05
Loaded plugins: fastestmirror, ovl
Determining fastest mirrors
 * base: mirrors.dgut.edu.cn
 * extras: mirrors.dgut.edu.cn
 * updates: mirrors.dgut.edu.cn
Resolving Dependencies
--> Running transaction check
---> Package vim-enhanced.x86_64 2:7.4.629-8.el7_9 will be installed
--> Processing Dependency: vim-common = 2:7.4.629-8.el7_9 for package: 2:vim-enhanced-7.4.629-8.el7_9.x86_64
--> Processing Dependency: which for package: 2:vim-enhanced-7.4.629-8.el7_9.x86_64
--> Processing Dependency: perl(:MODULE_COMPAT_5.16.3) for package: 2:vim-enhanced-7.4.629-8.el7_9.x86_64
--> Processing Dependency: libperl.so()(64bit) for package: 2:vim-enhanced-7.4.629-8.el7_9.x86_64
--> Processing Dependency: libgpm.so.2()(64bit) for package: 2:vim-enhanced-7.4.629-8.el7_9.x86_64
--> Running transaction check
---> Package gpm-libs.x86_64 0:1.20.7-6.el7 will be installed
---> Package perl.x86_64 4:5.16.3-299.el7_9 will be installed
--> Processing Dependency: perl(Socket) >= 1.3 for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(Scalar::Util) >= 1.10 for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl-macros for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(threads::shared) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(threads) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(constant) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(Time::Local) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(Time::HiRes) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(Storable) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(Socket) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(Scalar::Util) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(Pod::Simple::XHTML) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(Pod::Simple::Search) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(Getopt::Long) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(Filter::Util::Call) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(File::Temp) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(File::Spec::Unix) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(File::Spec::Functions) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(File::Spec) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(File::Path) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(Exporter) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(Cwd) for package: 4:perl-5.16.3-299.el7_9.x86_64
--> Processing Dependency: perl(Carp) for package: 4:perl-5.16.3-299.el7_9.x86_64
---> Package perl-libs.x86_64 4:5.16.3-299.el7_9 will be installed
---> Package vim-common.x86_64 2:7.4.629-8.el7_9 will be installed
--> Processing Dependency: vim-filesystem for package: 2:vim-common-7.4.629-8.el7_9.x86_64
---> Package which.x86_64 0:2.20-7.el7 will be installed
--> Running transaction check
---> Package perl-Carp.noarch 0:1.26-244.el7 will be installed
---> Package perl-Exporter.noarch 0:5.68-3.el7 will be installed
---> Package perl-File-Path.noarch 0:2.09-2.el7 will be installed
---> Package perl-File-Temp.noarch 0:0.23.01-3.el7 will be installed
---> Package perl-Filter.x86_64 0:1.49-3.el7 will be installed
---> Package perl-Getopt-Long.noarch 0:2.40-3.el7 will be installed
--> Processing Dependency: perl(Pod::Usage) >= 1.14 for package: perl-Getopt-Long-2.40-3.el7.noarch
--> Processing Dependency: perl(Text::ParseWords) for package: perl-Getopt-Long-2.40-3.el7.noarch
---> Package perl-PathTools.x86_64 0:3.40-5.el7 will be installed
---> Package perl-Pod-Simple.noarch 1:3.28-4.el7 will be installed
--> Processing Dependency: perl(Pod::Escapes) >= 1.04 for package: 1:perl-Pod-Simple-3.28-4.el7.noarch
--> Processing Dependency: perl(Encode) for package: 1:perl-Pod-Simple-3.28-4.el7.noarch
---> Package perl-Scalar-List-Utils.x86_64 0:1.27-248.el7 will be installed
---> Package perl-Socket.x86_64 0:2.010-5.el7 will be installed
---> Package perl-Storable.x86_64 0:2.45-3.el7 will be installed
---> Package perl-Time-HiRes.x86_64 4:1.9725-3.el7 will be installed
---> Package perl-Time-Local.noarch 0:1.2300-2.el7 will be installed
---> Package perl-constant.noarch 0:1.27-2.el7 will be installed
---> Package perl-macros.x86_64 4:5.16.3-299.el7_9 will be installed
---> Package perl-threads.x86_64 0:1.87-4.el7 will be installed
---> Package perl-threads-shared.x86_64 0:1.43-6.el7 will be installed
---> Package vim-filesystem.x86_64 2:7.4.629-8.el7_9 will be installed
--> Running transaction check
---> Package perl-Encode.x86_64 0:2.51-7.el7 will be installed
---> Package perl-Pod-Escapes.noarch 1:1.04-299.el7_9 will be installed
---> Package perl-Pod-Usage.noarch 0:1.63-3.el7 will be installed
--> Processing Dependency: perl(Pod::Text) >= 3.15 for package: perl-Pod-Usage-1.63-3.el7.noarch
--> Processing Dependency: perl-Pod-Perldoc for package: perl-Pod-Usage-1.63-3.el7.noarch
---> Package perl-Text-ParseWords.noarch 0:3.29-4.el7 will be installed
--> Running transaction check
---> Package perl-Pod-Perldoc.noarch 0:3.20-4.el7 will be installed
--> Processing Dependency: perl(parent) for package: perl-Pod-Perldoc-3.20-4.el7.noarch
--> Processing Dependency: perl(HTTP::Tiny) for package: perl-Pod-Perldoc-3.20-4.el7.noarch
--> Processing Dependency: groff-base for package: perl-Pod-Perldoc-3.20-4.el7.noarch
---> Package perl-podlators.noarch 0:2.5.1-3.el7 will be installed
--> Running transaction check
---> Package groff-base.x86_64 0:1.22.2-8.el7 will be installed
---> Package perl-HTTP-Tiny.noarch 0:0.033-3.el7 will be installed
---> Package perl-parent.noarch 1:0.225-244.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package                    Arch       Version                Repository   Size
================================================================================
Installing:
 vim-enhanced               x86_64     2:7.4.629-8.el7_9      updates     1.1 M
Installing for dependencies:
 gpm-libs                   x86_64     1.20.7-6.el7           base         32 k
 groff-base                 x86_64     1.22.2-8.el7           base        942 k
 perl                       x86_64     4:5.16.3-299.el7_9     updates     8.0 M
 perl-Carp                  noarch     1.26-244.el7           base         19 k
 perl-Encode                x86_64     2.51-7.el7             base        1.5 M
 perl-Exporter              noarch     5.68-3.el7             base         28 k
 perl-File-Path             noarch     2.09-2.el7             base         26 k
 perl-File-Temp             noarch     0.23.01-3.el7          base         56 k
 perl-Filter                x86_64     1.49-3.el7             base         76 k
 perl-Getopt-Long           noarch     2.40-3.el7             base         56 k
 perl-HTTP-Tiny             noarch     0.033-3.el7            base         38 k
 perl-PathTools             x86_64     3.40-5.el7             base         82 k
 perl-Pod-Escapes           noarch     1:1.04-299.el7_9       updates      52 k
 perl-Pod-Perldoc           noarch     3.20-4.el7             base         87 k
 perl-Pod-Simple            noarch     1:3.28-4.el7           base        216 k
 perl-Pod-Usage             noarch     1.63-3.el7             base         27 k
 perl-Scalar-List-Utils     x86_64     1.27-248.el7           base         36 k
 perl-Socket                x86_64     2.010-5.el7            base         49 k
 perl-Storable              x86_64     2.45-3.el7             base         77 k
 perl-Text-ParseWords       noarch     3.29-4.el7             base         14 k
 perl-Time-HiRes            x86_64     4:1.9725-3.el7         base         45 k
 perl-Time-Local            noarch     1.2300-2.el7           base         24 k
 perl-constant              noarch     1.27-2.el7             base         19 k
 perl-libs                  x86_64     4:5.16.3-299.el7_9     updates     690 k
 perl-macros                x86_64     4:5.16.3-299.el7_9     updates      44 k
 perl-parent                noarch     1:0.225-244.el7        base         12 k
 perl-podlators             noarch     2.5.1-3.el7            base        112 k
 perl-threads               x86_64     1.87-4.el7             base         49 k
 perl-threads-shared        x86_64     1.43-6.el7             base         39 k
 vim-common                 x86_64     2:7.4.629-8.el7_9      updates     5.9 M
 vim-filesystem             x86_64     2:7.4.629-8.el7_9      updates      11 k
 which                      x86_64     2.20-7.el7             base         41 k

Transaction Summary
================================================================================
Install  1 Package (+32 Dependent packages)

Total download size: 19 M
Installed size: 63 M
Downloading packages:
warning: /var/cache/yum/x86_64/7/base/packages/gpm-libs-1.20.7-6.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
Public key for gpm-libs-1.20.7-6.el7.x86_64.rpm is not installed
Public key for perl-5.16.3-299.el7_9.x86_64.rpm is not installed
--------------------------------------------------------------------------------
Total                                               13 MB/s |  19 MB  00:01     
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
importing GPG key 0xF4A80EB5:
 Userid     : "CentOS-7 Key (CentOS 7 Official Signing Key) "
 Fingerprint: 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5
 Package    : centos-release-7-9.2009.0.el7.centos.x86_64 (@CentOS)
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : gpm-libs-1.20.7-6.el7.x86_64                                1/33 
  Installing : 2:vim-filesystem-7.4.629-8.el7_9.x86_64                     2/33 
  Installing : 2:vim-common-7.4.629-8.el7_9.x86_64                         3/33 
  Installing : which-2.20-7.el7.x86_64                                     4/33 
install-info: No such file or directory for /usr/share/info/which.info.gz
  Installing : groff-base-1.22.2-8.el7.x86_64                              5/33 
  Installing : 1:perl-parent-0.225-244.el7.noarch                          6/33 
  Installing : perl-HTTP-Tiny-0.033-3.el7.noarch                           7/33 
  Installing : perl-podlators-2.5.1-3.el7.noarch                           8/33 
  Installing : perl-Pod-Perldoc-3.20-4.el7.noarch                          9/33 
  Installing : 1:perl-Pod-Escapes-1.04-299.el7_9.noarch                   10/33 
  Installing : perl-Encode-2.51-7.el7.x86_64                              11/33 
  Installing : perl-Text-ParseWords-3.29-4.el7.noarch                     12/33 
  Installing : perl-Pod-Usage-1.63-3.el7.noarch                           13/33 
  Installing : 4:perl-macros-5.16.3-299.el7_9.x86_64                      14/33 
  Installing : perl-Storable-2.45-3.el7.x86_64                            15/33 
  Installing : perl-Exporter-5.68-3.el7.noarch                            16/33 
  Installing : perl-constant-1.27-2.el7.noarch                            17/33 
  Installing : perl-Socket-2.010-5.el7.x86_64                             18/33 
  Installing : perl-Time-Local-1.2300-2.el7.noarch                        19/33 
  Installing : perl-Carp-1.26-244.el7.noarch                              20/33 
  Installing : perl-PathTools-3.40-5.el7.x86_64                           21/33 
  Installing : perl-Scalar-List-Utils-1.27-248.el7.x86_64                 22/33 
  Installing : 1:perl-Pod-Simple-3.28-4.el7.noarch                        23/33 
  Installing : perl-File-Temp-0.23.01-3.el7.noarch                        24/33 
  Installing : perl-File-Path-2.09-2.el7.noarch                           25/33 
  Installing : perl-threads-shared-1.43-6.el7.x86_64                      26/33 
  Installing : perl-threads-1.87-4.el7.x86_64                             27/33 
  Installing : 4:perl-Time-HiRes-1.9725-3.el7.x86_64                      28/33 
  Installing : perl-Filter-1.49-3.el7.x86_64                              29/33 
  Installing : 4:perl-libs-5.16.3-299.el7_9.x86_64                        30/33 
  Installing : perl-Getopt-Long-2.40-3.el7.noarch                         31/33 
  Installing : 4:perl-5.16.3-299.el7_9.x86_64                             32/33 
  Installing : 2:vim-enhanced-7.4.629-8.el7_9.x86_64                      33/33 
  Verifying  : perl-HTTP-Tiny-0.033-3.el7.noarch                           1/33 
  Verifying  : perl-threads-shared-1.43-6.el7.x86_64                       2/33 
  Verifying  : perl-Storable-2.45-3.el7.x86_64                             3/33 
  Verifying  : groff-base-1.22.2-8.el7.x86_64                              4/33 
  Verifying  : perl-Exporter-5.68-3.el7.noarch                             5/33 
  Verifying  : perl-constant-1.27-2.el7.noarch                             6/33 
  Verifying  : perl-PathTools-3.40-5.el7.x86_64                            7/33 
  Verifying  : 4:perl-macros-5.16.3-299.el7_9.x86_64                       8/33 
  Verifying  : 2:vim-enhanced-7.4.629-8.el7_9.x86_64                       9/33 
  Verifying  : 1:perl-parent-0.225-244.el7.noarch                         10/33 
  Verifying  : perl-Socket-2.010-5.el7.x86_64                             11/33 
  Verifying  : which-2.20-7.el7.x86_64                                    12/33 
  Verifying  : 2:vim-filesystem-7.4.629-8.el7_9.x86_64                    13/33 
  Verifying  : perl-File-Temp-0.23.01-3.el7.noarch                        14/33 
  Verifying  : 1:perl-Pod-Simple-3.28-4.el7.noarch                        15/33 
  Verifying  : perl-Time-Local-1.2300-2.el7.noarch                        16/33 
  Verifying  : 1:perl-Pod-Escapes-1.04-299.el7_9.noarch                   17/33 
  Verifying  : perl-Carp-1.26-244.el7.noarch                              18/33 
  Verifying  : 2:vim-common-7.4.629-8.el7_9.x86_64                        19/33 
  Verifying  : perl-Scalar-List-Utils-1.27-248.el7.x86_64                 20/33 
  Verifying  : perl-Pod-Usage-1.63-3.el7.noarch                           21/33 
  Verifying  : perl-Encode-2.51-7.el7.x86_64                              22/33 
  Verifying  : perl-Pod-Perldoc-3.20-4.el7.noarch                         23/33 
  Verifying  : perl-podlators-2.5.1-3.el7.noarch                          24/33 
  Verifying  : 4:perl-5.16.3-299.el7_9.x86_64                             25/33 
  Verifying  : perl-File-Path-2.09-2.el7.noarch                           26/33 
  Verifying  : perl-threads-1.87-4.el7.x86_64                             27/33 
  Verifying  : 4:perl-Time-HiRes-1.9725-3.el7.x86_64                      28/33 
  Verifying  : gpm-libs-1.20.7-6.el7.x86_64                               29/33 
  Verifying  : perl-Filter-1.49-3.el7.x86_64                              30/33 
  Verifying  : perl-Getopt-Long-2.40-3.el7.noarch                         31/33 
  Verifying  : perl-Text-ParseWords-3.29-4.el7.noarch                     32/33 
  Verifying  : 4:perl-libs-5.16.3-299.el7_9.x86_64                        33/33 

Installed:
  vim-enhanced.x86_64 2:7.4.629-8.el7_9                                         

Dependency Installed:
  gpm-libs.x86_64 0:1.20.7-6.el7                                                
  groff-base.x86_64 0:1.22.2-8.el7                                              
  perl.x86_64 4:5.16.3-299.el7_9                                                
  perl-Carp.noarch 0:1.26-244.el7                                               
  perl-Encode.x86_64 0:2.51-7.el7                                               
  perl-Exporter.noarch 0:5.68-3.el7                                             
  perl-File-Path.noarch 0:2.09-2.el7                                            
  perl-File-Temp.noarch 0:0.23.01-3.el7                                         
  perl-Filter.x86_64 0:1.49-3.el7                                               
  perl-Getopt-Long.noarch 0:2.40-3.el7                                          
  perl-HTTP-Tiny.noarch 0:0.033-3.el7                                           
  perl-PathTools.x86_64 0:3.40-5.el7                                            
  perl-Pod-Escapes.noarch 1:1.04-299.el7_9                                      
  perl-Pod-Perldoc.noarch 0:3.20-4.el7                                          
  perl-Pod-Simple.noarch 1:3.28-4.el7                                           
  perl-Pod-Usage.noarch 0:1.63-3.el7                                            
  perl-Scalar-List-Utils.x86_64 0:1.27-248.el7                                  
  perl-Socket.x86_64 0:2.010-5.el7                                              
  perl-Storable.x86_64 0:2.45-3.el7                                             
  perl-Text-ParseWords.noarch 0:3.29-4.el7                                      
  perl-Time-HiRes.x86_64 4:1.9725-3.el7                                         
  perl-Time-Local.noarch 0:1.2300-2.el7                                         
  perl-constant.noarch 0:1.27-2.el7                                             
  perl-libs.x86_64 4:5.16.3-299.el7_9                                           
  perl-macros.x86_64 4:5.16.3-299.el7_9                                         
  perl-parent.noarch 1:0.225-244.el7                                            
  perl-podlators.noarch 0:2.5.1-3.el7                                           
  perl-threads.x86_64 0:1.87-4.el7                                              
  perl-threads-shared.x86_64 0:1.43-6.el7                                       
  vim-common.x86_64 2:7.4.629-8.el7_9                                           
  vim-filesystem.x86_64 2:7.4.629-8.el7_9                                       
  which.x86_64 0:2.20-7.el7                                                     

Complete!
Removing intermediate container c633f2668a05
 ---> a56aa238f1d1
Step 6/10 : RUN yum -y install net-tools
 ---> Running in 67be20eae7f8
Loaded plugins: fastestmirror, ovl
Loading mirror speeds from cached hostfile
 * base: mirrors.dgut.edu.cn
 * extras: mirrors.dgut.edu.cn
 * updates: mirrors.dgut.edu.cn
Resolving Dependencies
--> Running transaction check
---> Package net-tools.x86_64 0:2.0-0.25.20131004git.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package         Arch         Version                          Repository  Size
================================================================================
Installing:
 net-tools       x86_64       2.0-0.25.20131004git.el7         base       306 k

Transaction Summary
================================================================================
Install  1 Package

Total download size: 306 k
Installed size: 917 k
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : net-tools-2.0-0.25.20131004git.el7.x86_64                    1/1 
  Verifying  : net-tools-2.0-0.25.20131004git.el7.x86_64                    1/1 

Installed:
  net-tools.x86_64 0:2.0-0.25.20131004git.el7                                   

Complete!
Removing intermediate container 67be20eae7f8
 ---> a84a27888973
Step 7/10 : EXPOSE 80
 ---> Running in 5b7bd3ccbf92
Removing intermediate container 5b7bd3ccbf92
 ---> 0589d6ccc6c6
Step 8/10 : CMD echo $MYPATH
 ---> Running in 0d6a8652e3ef
Removing intermediate container 0d6a8652e3ef
 ---> d6961b0f34e8
Step 9/10 : CMD echo  "---------xjszsd"
 ---> Running in 42441fa5dde8
Removing intermediate container 42441fa5dde8
 ---> 81c25a25bfaa
Step 10/10 : CMD /bin/bash
 ---> Running in 8ad3a2d788a5
Removing intermediate container 8ad3a2d788a5
 ---> 3664dc5b701c
Successfully built 3664dc5b701c
Successfully tagged mycentos:0.1
[root@iZwz92v9xcjopi734c76bdZ dockerfile]# docker images
REPOSITORY    TAG       IMAGE ID       CREATED          SIZE
mycentos      0.1       3664dc5b701c   14 seconds ago   570MB
            c0eb206c27b4   40 minutes ago   231MB
nginx         latest    605c77e624dd   5 weeks ago      141MB
tomcat        9.0       b8e65a4d736d   6 weeks ago      680MB
mysql         5.7       c20987f18b13   6 weeks ago      448MB
hello-world   latest    feb5d9fea6a5   4 months ago     13.3kB
centos        7         eeb6ee3f44bd   4 months ago     204MB
centos        latest    5d0da3dc9764   4 months ago     231MB
[root@iZwz92v9xcjopi734c76bdZ dockerfile]# docker rmi c0eb206c27b4
Error response from daemon: conflict: unable to delete c0eb206c27b4 (must be forced) - image is being used by stopped container b5812c4f6352
[root@iZwz92v9xcjopi734c76bdZ dockerfile]# docker ps
ConTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES
[root@iZwz92v9xcjopi734c76bdZ dockerfile]# docker ps -a
ConTAINER ID   IMAGE          COMMAND                  CREATED          STATUS                      PORTS     NAMES
c2d4dbb3cd79   c0eb206c27b4   "/bin/sh -c 'yum -y …"   4 minutes ago    Exited (1) 4 minutes ago              relaxed_matsumoto
b5812c4f6352   c0eb206c27b4   "/bin/sh -c 'yum -y …"   7 minutes ago    Exited (1) 6 minutes ago              heuristic_jang
c97a8ef80999   c0eb206c27b4   "/bin/sh -c 'yum -y …"   8 minutes ago    Exited (1) 8 minutes ago              sharp_chatelet
a888ef5f07e7   c0eb206c27b4   "/bin/sh -c 'yum -y …"   17 minutes ago   Exited (1) 17 minutes ago             funny_payne
afb092703d4f   c0eb206c27b4   "/bin/sh -c 'yum -y …"   17 minutes ago   Exited (1) 17 minutes ago             pedantic_brown
238a54550a95   c0eb206c27b4   "/bin/sh -c 'yum -y …"   22 minutes ago   Exited (1) 22 minutes ago             amazing_swanson
b7da327ee70f   c0eb206c27b4   "/bin/sh -c 'yum -y …"   23 minutes ago   Exited (1) 23 minutes ago             mystifying_poitras
678ba998b383   c0eb206c27b4   "/bin/sh -c 'yum -y …"   31 minutes ago   Exited (1) 31 minutes ago             optimistic_cerf
9efbdada339f   c0eb206c27b4   "/bin/sh -c 'yum -y …"   41 minutes ago   Exited (1) 41 minutes ago             bold_austin
e753e9dcaea0   c0eb206c27b4   "/bin/sh -c 'yum  -y…"   42 minutes ago   Exited (1) 41 minutes ago             recursing_banach
c8eb6df1d8e6   mysql:5.7      "docker-entrypoint.s…"   8 days ago       Exited (0) 8 days ago                 m1
1f55411e177d   tomcat:9.0     "catalina.sh run"        9 days ago       Exited (143) 9 days ago               tomcat1
ab392435b5f3   centos         "/bin/bash"              10 days ago      Exited (0) 10 days ago                c3
c40a77116581   centos         "/bin/bash --name c1"    10 days ago      Exited (2) 10 days ago                nice_johnson
2615c2912e02   nginx          "/docker-entrypoint.…"   10 days ago      Exited (0) 10 days ago                ng2
0e7349c0ad63   nginx          "/docker-entrypoint.…"   10 days ago      Exited (0) 10 days ago                ng1
080d3e977006   centos         "--name c2"              10 days ago      Created                               happy_yalow
f4d32decf956   centos         "/bin/bash"              10 days ago      Exited (0) 10 days ago                c1
933d469e9eee   centos         "/bin/bash"              10 days ago      Exited (0) 10 days ago                beautiful_brattain
cd89168fc3c8   centos         "/bin/bash"              10 days ago      Exited (0) 10 days ago                sad_murdock
fefa06e70a0d   centos         "/bin/bash"              10 days ago      Exited (130) 10 days ago              competent_sammet
[root@iZwz92v9xcjopi734c76bdZ dockerfile]# docker rm  b5812c4f6352
b5812c4f6352
[root@iZwz92v9xcjopi734c76bdZ dockerfile]# docker rmi c0eb206c27b4
Error response from daemon: conflict: unable to delete c0eb206c27b4 (must be forced) - image is being used by stopped container b7da327ee70f
[root@iZwz92v9xcjopi734c76bdZ dockerfile]# docker rm  b7da327ee70f
b7da327ee70f
[root@iZwz92v9xcjopi734c76bdZ dockerfile]# docker rmi c0eb206c27b4
Error response from daemon: conflict: unable to delete c0eb206c27b4 (must be forced) - image is being used by stopped container c97a8ef80999
[root@iZwz92v9xcjopi734c76bdZ dockerfile]#

4.意外情况

真所谓凡事都有例外
有些同志会出现：

亦或是这样：

解决方案：

图一：
可参考方案一
仔细看看centos的版本，如果是8以上的就会有联网问题

图二：
一般都是在Dockerfile中使用RUN yum 安装一些个别的命令
最主要的是联网链接不上
1.设置镜像中的个别命令有墙堵住
2.网络配置问题可参考方案二

Docker之Dockerfile

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