Docker学习 - 12.结合保留关键字自定义一个centos - 《学习》

1.自定义一个Dockerfile
2.安装过程：
3.启动自定义的镜像
4.查看镜像的变更历史

1.自定义一个Dockerfile

FROM centos // 继承本地centos的镜像
MAINTAINER zzyyzzyy167@126.com // 作者和邮箱
ENV MYPATH /usr/local
WORKDIR $MYPATH //引用地址，为登录后的落脚点
RUN yum -y install vim //原版的centos镜像中没有vim和 netwok模块
RUN yum -y install net-tools
EXPOSE 80 //暴露端口
CMD echo $MYPATH
CMD echo “success——-…..——ok”
CMD /bin/bash

2.安装过程：

安装 vim和net-tools模块消耗的时间多一些

[root@test mydocker]# docker build -f Dockerfile1 -t mycentos:1.1 .
Sending build context to Docker daemon  3.072kB
Step 1/8 : FROM centos
 ---> 300e315adb2f
Step 2/8 : MAINTAINER zhy<123@qq.com>
 ---> Using cache
 ---> 5ce63c157e9a
Step 3/8 : ENV MYPATH /usr/local
 ---> Using cache
 ---> 27bda98124bf
Step 4/8 : WORKDIR $MYPATH
 ---> Using cache
 ---> 2cb99337c3af
Step 5/8 : RUN yum -y install vim
 ---> Running in 9268967cb2bb
CentOS Linux 8 - AppStream                      382 kB/s | 6.3 MB     00:16    
CentOS Linux 8 - BaseOS                         373 kB/s | 2.3 MB     00:06    
CentOS Linux 8 - Extras                          12 kB/s | 8.6 kB     00:00    
Dependencies resolved.
================================================================================
 Package             Arch        Version                   Repository      Size
================================================================================
Installing:
 vim-enhanced        x86_64      2:8.0.1763-15.el8         appstream      1.4 M
Installing dependencies:
 gpm-libs            x86_64      1.20.7-15.el8             appstream       39 k
 vim-common          x86_64      2:8.0.1763-15.el8         appstream      6.3 M
 vim-filesystem      noarch      2:8.0.1763-15.el8         appstream       48 k
 which               x86_64      2.21-12.el8               baseos          49 k
Transaction Summary
================================================================================
Install  5 Packages
Total download size: 7.8 M
Installed size: 30 M
Downloading Packages:
(1/5): gpm-libs-1.20.7-15.el8.x86_64.rpm        238 kB/s |  39 kB     00:00    
(2/5): vim-filesystem-8.0.1763-15.el8.noarch.rp 576 kB/s |  48 kB     00:00    
(3/5): which-2.21-12.el8.x86_64.rpm              26 kB/s |  49 kB     00:01    
(4/5): vim-enhanced-8.0.1763-15.el8.x86_64.rpm  309 kB/s | 1.4 MB     00:04    
(5/5): vim-common-8.0.1763-15.el8.x86_64.rpm    194 kB/s | 6.3 MB     00:33    
--------------------------------------------------------------------------------
Total                                           222 kB/s | 7.8 MB     00:36     
warning: /var/cache/dnf/appstream-02e86d1c976ab532/packages/gpm-libs-1.20.7-15.el8.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID 8483c65d: NOKEY
CentOS Linux 8 - AppStream                      206 kB/s | 1.6 kB     00:00    
Importing GPG key 0x8483C65D:
 Userid     : "CentOS (CentOS Official Signing Key) <security@centos.org>"
 Fingerprint: 99DB 70FA E1D7 CE22 7FB6 4882 05B5 55B3 8483 C65D
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
Key imported successfully
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                        1/1 
  Installing       : which-2.21-12.el8.x86_64                               1/5 
  Installing       : vim-filesystem-2:8.0.1763-15.el8.noarch                2/5 
  Installing       : vim-common-2:8.0.1763-15.el8.x86_64                    3/5 
  Installing       : gpm-libs-1.20.7-15.el8.x86_64                          4/5 
  Running scriptlet: gpm-libs-1.20.7-15.el8.x86_64                          4/5 
  Installing       : vim-enhanced-2:8.0.1763-15.el8.x86_64                  5/5 
  Running scriptlet: vim-enhanced-2:8.0.1763-15.el8.x86_64                  5/5 
  Running scriptlet: vim-common-2:8.0.1763-15.el8.x86_64                    5/5 
  Verifying        : gpm-libs-1.20.7-15.el8.x86_64                          1/5 
  Verifying        : vim-common-2:8.0.1763-15.el8.x86_64                    2/5 
  Verifying        : vim-enhanced-2:8.0.1763-15.el8.x86_64                  3/5 
  Verifying        : vim-filesystem-2:8.0.1763-15.el8.noarch                4/5 
  Verifying        : which-2.21-12.el8.x86_64                               5/5 
Installed:
  gpm-libs-1.20.7-15.el8.x86_64         vim-common-2:8.0.1763-15.el8.x86_64    
  vim-enhanced-2:8.0.1763-15.el8.x86_64 vim-filesystem-2:8.0.1763-15.el8.noarch
  which-2.21-12.el8.x86_64             
Complete!
Removing intermediate container 9268967cb2bb
 ---> f4e0ad28a3c5
Step 6/8 : RUN yum -y install net-tools
 ---> Running in f5d010858c79
Last metadata expiration check: 0:00:49 ago on Sun Jan 24 08:45:54 2021.
Dependencies resolved.
================================================================================
 Package         Architecture Version                        Repository    Size
================================================================================
Installing:
 net-tools       x86_64       2.0-0.52.20160912git.el8       baseos       322 k
Transaction Summary
================================================================================
Install  1 Package
Total download size: 322 k
Installed size: 942 k
Downloading Packages:
net-tools-2.0-0.52.20160912git.el8.x86_64.rpm   117 kB/s | 322 kB     00:02    
--------------------------------------------------------------------------------
Total                                            96 kB/s | 322 kB     00:03     
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                        1/1 
  Installing       : net-tools-2.0-0.52.20160912git.el8.x86_64              1/1 
  Running scriptlet: net-tools-2.0-0.52.20160912git.el8.x86_64              1/1 
  Verifying        : net-tools-2.0-0.52.20160912git.el8.x86_64              1/1 
Installed:
  net-tools-2.0-0.52.20160912git.el8.x86_64                                     
Complete!
Removing intermediate container f5d010858c79
 ---> 17045c410a3a
Step 7/8 : EXPOSE 80
 ---> Running in e0f8613d2f81
Removing intermediate container e0f8613d2f81
 ---> 62a690413282
Step 8/8 : CMD /bin/bash
 ---> Running in f385e8bf4b9c
Removing intermediate container f385e8bf4b9c
 ---> ee45963ddcf4
Successfully built ee45963ddcf4
Successfully tagged mycentos:1.1

3.启动自定义的镜像

[root@test mydocker]# docker run -it mycentos:1.1
[root@b825aedfbad4 local]#               //落脚点为dockerfile中编辑的   /usr/local
[root@b825aedfbad4 local]# vim 1.txt   //支持 vim编辑
[root@b825aedfbad4 local]# ip addr       //支持 net-tools网络模块
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
10: eth0@if11: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
    link/ether 02:42:ac:11:00:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 172.17.0.2/16 brd 172.17.255.255 scope global eth0
       valid_lft forever preferred_lft forever
[root@b825aedfbad4 local]#

4.查看镜像的变更历史

[root@b825aedfbad4 local]# [root@test mydocker]# docker images
REPOSITORY       TAG       IMAGE ID       CREATED       SIZE
mycentos         1.1       ee45963ddcf4   5 hours ago   291MB
[root@test mydocker]# docker history ee45963ddcf4
IMAGE          CREATED       CREATED BY                                      SIZE      COMMENT
ee45963ddcf4   5 hours ago   /bin/sh -c #(nop)  CMD ["/bin/sh" "-c" "/bin…   0B        
62a690413282   5 hours ago   /bin/sh -c #(nop)  EXPOSE 80                    0B        
17045c410a3a   5 hours ago   /bin/sh -c yum -y install net-tools             23.3MB    
f4e0ad28a3c5   5 hours ago   /bin/sh -c yum -y install vim                   58.1MB    
2cb99337c3af   5 hours ago   /bin/sh -c #(nop) WORKDIR /usr/local            0B        
27bda98124bf   5 hours ago   /bin/sh -c #(nop)  ENV MYPATH=/usr/local        0B        
5ce63c157e9a   5 hours ago   /bin/sh -c #(nop)  MAINTAINER zhy<123@qq.com>   0B        
300e315adb2f   6 weeks ago   /bin/sh -c #(nop)  CMD ["/bin/bash"]            0B        
<missing>      6 weeks ago   /bin/sh -c #(nop)  LABEL org.label-schema.sc…   0B        
<missing>      6 weeks ago   /bin/sh -c #(nop) ADD file:bd7a2aed6ede423b7…   209MB