Docker学习--用Dockerfile构建常用基础镜像

约定不等于承诺〃 2023-06-30 06:47 0阅读 0赞

在使用docker的过程中，我们会不断的使用Dockerfile来构建镜像。网上的镜像虽然多，但是未必适用于自己的环境。在真正使用的过程中，要根据自己公司和团队的技术栈来构建不同的Docker镜像。日常的一些基础镜像，像是CentOS基础镜像、java环境镜像、tomcat镜像、jenkins镜像等等，都是我们平常会经常用到的，所以制作这些基础镜像，显然是有必要的。

## 一、构建CentOS7.6（包含SSH） ##

#### 1、思路 ####

思路其实很简单：  
1）在官方镜像中安装一些自己要用的命令  
2）设置镜像中的ssh密码  
3）用supervisor来管理sshd进程，关于supervisor的详细介绍，可以查看我的另外一篇文章[《使用supervisor管理进程》][supervisor]

#### 2、文件 ####

构建CentOS7.6镜像的时候，用到三个文件

[root@docker centos7-ssh]# ls
    Dockerfile  sshd.ini  supervisord.conf

**1）Dockerfile**

# Docker for CentOS
    
    # Base image
    
    FROM daocloud.io/library/centos:centos7.6.1810
    
    # Who
    
    MAINTAINER wangchao xxx@163.com
    
    # EPEL
    
    RUN rpm -ivh http://mirrors.aliyun.com/epel/epel-release-latest-7.noarch.rpm
    
    # Base pkg
    
    RUN yum -y install wget
    
    RUN wget -P /etc/yum.repos.d http://mirrors.aliyun.com/repo/Centos-7.repo
    
    RUN yum -y install vim screen lrzsz tree openssl openssh-clients openssl-devel openssh-server telnet iftop iotop sysstat wget ntpdate dos2unix lsof net-tools mtr gcc gcc-c++ cmake zip unzip supervisor git sudo psmisc && yum clean all
    
    # For SSHD
    
    RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
    
    RUN ssh-keygen -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key
    
    RUN ssh-keygen -A -t dsa -f /etc/ssh/ssh_host_dsa_key
    
    # Set timezone
    
    RUN rm -f /etc/localtime && cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
    
    # Set root password
    
    RUN echo "root:wangchao123" | chpasswd
    
    # Supervisord config
    
    ADD supervisord.conf /etc/supervisord.conf
    
    ADD sshd.ini /etc/supervisord.d/sshd.ini
    
    # Outside Port
    
    EXPOSE 22
    
    # supervisord start
    
    CMD ["/usr/bin/supervisord", "-c", "/etc/supervisord.conf"]

**2）supervisord.conf**

[root@docker centos7-ssh]# cat supervisord.conf 
    ; Sample supervisor config file.
    ;
    ; For more information on the config file, please see:
    ; http://supervisord.org/configuration.html
    ;
    ; Notes:
    ;  - Shell expansion ("~" or "$HOME") is not supported.  Environment
    ;    variables can be expanded using this syntax: "%(ENV_HOME)s".
    ;  - Quotes around values are not supported, except in the case of
    ;    the environment= options as shown below.
    ;  - Comments must have a leading space: "a=b ;comment" not "a=b;comment".
    ;  - Command will be truncated if it looks like a config file comment, e.g.
    ;    "command=bash -c 'foo ; bar'" will truncate to "command=bash -c 'foo ".
    
    [unix_http_server]
    file=/tmp/supervisor.sock   ; the path to the socket file
    ;chmod=0700                 ; socket file mode (default 0700)
    ;chown=nobody:nogroup       ; socket file uid:gid owner
    ;username=user              ; default is no username (open server)
    ;password=123               ; default is no password (open server)
    
    [inet_http_server]         ; inet (TCP) server disabled by default
    port=0.0.0.0:9001        ; ip_address:port specifier, *:port for all iface
    username=user              ; default is no username (open server)
    password=321               ; default is no password (open server)
    
    [supervisord]
    logfile=/tmp/supervisord.log ; main log file; default $CWD/supervisord.log
    logfile_maxbytes=50MB        ; max main logfile bytes b4 rotation; default 50MB
    logfile_backups=10           ; # of main logfile backups; 0 means none, default 10
    loglevel=info                ; log level; default info; others: debug,warn,trace
    pidfile=/tmp/supervisord.pid ; supervisord pidfile; default supervisord.pid
    nodaemon=true               ; start in foreground if true; default false
    minfds=1024                  ; min. avail startup file descriptors; default 1024
    minprocs=200                 ; min. avail process descriptors;default 200
    ;umask=022                   ; process file creation umask; default 022
    ;user=chrism                 ; default is current user, required if root
    ;identifier=supervisor       ; supervisord identifier, default is 'supervisor'
    ;directory=/tmp              ; default is not to cd during start
    ;nocleanup=true              ; don't clean up tempfiles at start; default false ;childlogdir=/tmp ; 'AUTO' child log dir, default $TEMP ;environment=KEY="value" ; key value pairs to add to environment ;strip_ansi=false ; strip ansi escape codes in logs; def. false ; The rpcinterface:supervisor section must remain in the config file for ; RPC (supervisorctl/web interface) to work. Additional interfaces may be ; added by defining them in separate [rpcinterface:x] sections. [rpcinterface:supervisor] supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface ; The supervisorctl section configures how supervisorctl will connect to ; supervisord. configure it match the settings in either the unix_http_server ; or inet_http_server section. [supervisorctl] serverurl=unix:///tmp/supervisor.sock ; use a unix:// URL for a unix socket ;serverurl=http://127.0.0.1:9001 ; use an http:// url to specify an inet socket ;username=chris ; should be same as in [*_http_server] if set ;password=123 ; should be same as in [*_http_server] if set ;prompt=mysupervisor ; cmd line prompt (default "supervisor") ;history_file=~/.sc_history ; use readline history if available ; The sample program section below shows all possible program subsection values. ; Create one or more 'real' program: sections to be able to control them under ; supervisor. ;[program:theprogramname] ;command=/bin/cat ; the program (relative uses PATH, can take args) ;process_name=%(program_name)s ; process_name expr (default %(program_name)s) ;numprocs=1 ; number of processes copies to start (def 1) ;directory=/tmp ; directory to cwd to before exec (def no cwd) ;umask=022 ; umask for process (default None) ;priority=999 ; the relative start priority (default 999) ;autostart=true ; start at supervisord start (default: true) ;startsecs=1 ; # of secs prog must stay up to be running (def. 1) ;startretries=3 ; max # of serial start failures when starting (default 3) ;autorestart=unexpected ; when to restart if exited after running (def: unexpected) ;exitcodes=0,2 ; 'expected' exit codes used with autorestart (default 0,2) ;stopsignal=QUIT ; signal used to kill process (default TERM) ;stopwaitsecs=10 ; max num secs to wait b4 SIGKILL (default 10) ;stopasgroup=false ; send stop signal to the UNIX process group (default false) ;killasgroup=false ; SIGKILL the UNIX process group (def false) ;user=chrism ; setuid to this UNIX account to run the program ;redirect_stderr=true ; redirect proc stderr to stdout (default false) ;stdout_logfile=/a/path ; stdout log path, NONE for none; default AUTO ;stdout_logfile_maxbytes=1MB ; max # logfile bytes b4 rotation (default 50MB) ;stdout_logfile_backups=10 ; # of stdout logfile backups (0 means none, default 10) ;stdout_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0) ;stdout_events_enabled=false ; emit events on stdout writes (default false) ;stderr_logfile=/a/path ; stderr log path, NONE for none; default AUTO ;stderr_logfile_maxbytes=1MB ; max # logfile bytes b4 rotation (default 50MB) ;stderr_logfile_backups=10 ; # of stderr logfile backups (0 means none, default 10) ;stderr_capture_maxbytes=1MB ; number of bytes in 'capturemode' (default 0) ;stderr_events_enabled=false ; emit events on stderr writes (default false) ;environment=A="1",B="2" ; process environment additions (def no adds) ;serverurl=AUTO ; override serverurl computation (childutils) ; The sample eventlistener section below shows all possible eventlistener ; subsection values. Create one or more 'real' eventlistener: sections to be ; able to handle event notifications sent by supervisord. ;[eventlistener:theeventlistenername] ;command=/bin/eventlistener ; the program (relative uses PATH, can take args) ;process_name=%(program_name)s ; process_name expr (default %(program_name)s) ;numprocs=1 ; number of processes copies to start (def 1) ;events=EVENT ; event notif. types to subscribe to (req'd)
    ;buffer_size=10                ; event buffer queue size (default 10)
    ;directory=/tmp                ; directory to cwd to before exec (def no cwd)
    ;umask=022                     ; umask for process (default None)
    ;priority=-1                   ; the relative start priority (default -1)
    ;autostart=true                ; start at supervisord start (default: true)
    ;startsecs=1                   ; # of secs prog must stay up to be running (def. 1)
    ;startretries=3                ; max # of serial start failures when starting (default 3)
    ;autorestart=unexpected        ; autorestart if exited after running (def: unexpected)
    ;exitcodes=0,2                 ; 'expected' exit codes used with autorestart (default 0,2)
    ;stopsignal=QUIT               ; signal used to kill process (default TERM)
    ;stopwaitsecs=10               ; max num secs to wait b4 SIGKILL (default 10)
    ;stopasgroup=false             ; send stop signal to the UNIX process group (default false)
    ;killasgroup=false             ; SIGKILL the UNIX process group (def false)
    ;user=chrism                   ; setuid to this UNIX account to run the program
    ;redirect_stderr=false         ; redirect_stderr=true is not allowed for eventlisteners
    ;stdout_logfile=/a/path        ; stdout log path, NONE for none; default AUTO
    ;stdout_logfile_maxbytes=1MB   ; max # logfile bytes b4 rotation (default 50MB)
    ;stdout_logfile_backups=10     ; # of stdout logfile backups (0 means none, default 10)
    ;stdout_events_enabled=false   ; emit events on stdout writes (default false)
    ;stderr_logfile=/a/path        ; stderr log path, NONE for none; default AUTO
    ;stderr_logfile_maxbytes=1MB   ; max # logfile bytes b4 rotation (default 50MB)
    ;stderr_logfile_backups=10     ; # of stderr logfile backups (0 means none, default 10)
    ;stderr_events_enabled=false   ; emit events on stderr writes (default false)
    ;environment=A="1",B="2"       ; process environment additions
    ;serverurl=AUTO                ; override serverurl computation (childutils)
    
    ; The sample group section below shows all possible group values.  Create one
    ; or more 'real' group: sections to create "heterogeneous" process groups.
    
    ;[group:thegroupname]
    ;programs=progname1,progname2  ; each refers to 'x' in [program:x] definitions
    ;priority=999                  ; the relative start priority (default 999)
    
    ; The [include] section can just contain the "files" setting.  This
    ; setting can list multiple files (separated by whitespace or
    ; newlines).  It can also contain wildcards.  The filenames are
    ; interpreted as relative to this file.  Included files *cannot*
    ; include files themselves.
    
    [include]
    files = /etc/supervisord.d/*.ini

**3）sshd.ini**

[root@docker centos7-ssh]# cat sshd.ini 
    [program:sshd]
    command=/usr/sbin/sshd -D
    process_name=%(program_name)s
    autostart=true
    stdout_logfile_maxbytes=100MB
    stdout_logfile_backups=10

#### 3、构建镜像 ####

开始构建镜像，名称定义为自己私服的地址。

[root@docker centos7-ssh]# docker build -t docker.mynexus.com/myimages/centos:7.6 .
    ...... #中间省略n行输出
    Successfully built 9a3dc3024f39
    Successfully tagged docker.mynexus.com/myimages/centos:7.6

构建完成之后查看下镜像。

[root@docker centos7-ssh]# docker images
    REPOSITORY                           TAG                 IMAGE ID            CREATED             SIZE
    docker.mynexus.com/myimages/centos   7.6                 9a3dc3024f39        12 seconds ago      496MB
    daocloud.io/library/centos           centos7.6.1810      f1cb7c7d58b7        9 months ago        202MB

把镜像推动到私服中。

[root@docker centos7-ssh]# docker push docker.mynexus.com/myimages/centos:7.6

用镜像构建容器。

[root@docker centos7-ssh]# docker run -d --name centos7-ssh-supervisor -p 3322:22 docker.mynexus.com/myimages/centos:7.6 
    7d56105e34c98e22076474535472f560c96c713b1fdd03262d55db1469162ebc
    
    [root@docker centos7-ssh]# docker ps
    CONTAINER ID        IMAGE                                    COMMAND                  CREATED              STATUS              PORTS                  NAMES
    7d56105e34c9        docker.mynexus.com/myimages/centos:7.6   "/usr/bin/supervisor…"   About a minute ago   Up About a minute   0.0.0.0:3322->22/tcp   centos7-ssh-supervisor

使用ssh连接容器

[root@docker centos7-ssh]# ssh root@192.168.0.151 -p 3322
    root@192.168.0.151's password: 
    Last login: Wed Jan  8 08:10:11 2020 from 192.168.0.151
    [root@4c69dc480eeb ~]#

可以看到，顺利地连接上了这个刚构建的容器。

## 二、构建jdk镜像 ##

#### 1、思路 ####

思路其实很简单：在上面构建好的CentOS7.6镜像的基础上，再加一个jdk即可。

#### 2、文件 ####

一共用到两个文件

[root@docker jdk1.8]# ls
    Dockerfile  jdk-8u202-linux-x64.tar.gz

**1）Dockerfile**

# Docker for Jdk
    
    # Base image
    
    FROM docker.mynexus.com/myimages/centos:7.6
    
    # Who
    
    MAINTAINER wangchao xxx@163.com
    
    # Install JAVA
    ADD jdk-8u202-linux-x64.tar.gz /usr/local/
    
    # JAVA_HOME
    
    ENV JAVA_HOME /usr/local/jdk1.8.0_202
    
    ENV PATH $PATH:$JAVA_HOME/bin
    
    # Outside Port
    
    EXPOSE 22
    
    # supervisord start
    
    CMD ["/usr/bin/supervisord", "-c", "/etc/supervisord.conf"]

**2）jdk压缩包**

去[jdk官网][jdk]下载就行。

#### 3、构建镜像 ####

构建镜像

[root@docker jdk1.8]# docker build -t docker.mynexus.com/myimages/jdk:1.8 .
    ...... #中间省略n行输出
    Successfully built 1d56be97ef09
    Successfully tagged docker.mynexus.com/myimages/jdk:1.8

用镜像构建容器并验证

[root@docker jdk1.8]# docker run -d --name centos7-jdk -p 4422:22 docker.mynexus.com/myimages/jdk:1.8
    0347886dc9a38f26102f885e93d5c5ac350a5180b90a72c024884174ba2792c7
    
    [root@docker jdk1.8]# docker ps
    CONTAINER ID        IMAGE                                    COMMAND                  CREATED             STATUS              PORTS                  NAMES
    0347886dc9a3        docker.mynexus.com/myimages/jdk:1.8      "/usr/bin/supervisor…"   11 seconds ago      Up 10 seconds       0.0.0.0:4422->22/tcp   centos7-jdk
    
    [root@docker jdk1.8]# docker exec -it centos7-jdk bash
    [root@0347886dc9a3 yum.repos.d]# java -version
    java version "1.8.0_202"
    Java(TM) SE Runtime Environment (build 1.8.0_202-b08)
    Java HotSpot(TM) 64-Bit Server VM (build 25.202-b08, mixed mode)

## 三、构建tomcat镜像 ##

#### 1、思路 ####

思路很简单：在上面构建好的jdk镜像的基础上，再加一个tomcat就行。

#### 2、文件 ####

需要三个文件。

[root@docker tomcat]# ls
    Dockerfile  tomcat8.5.38.tar.gz  tomcat.ini

**1）Dockerfile**

[root@docker tomcat]# cat Dockerfile 
    # Docker for CentOS
    
    # Base image
    
    FROM docker.mynexus.com/myimages/jdk:1.8
    
    # Who
    
    MAINTAINER wangchao xxx@163.com
    
    # Tomcat
    
    ADD tomcat8.5.38.tar.gz /usr/local/
    
    ADD tomcat.ini /etc/supervisord.d/tomcat.ini
    
    ENV TOMCAT_HOME /usr/local/tomcat
    
    # Outside Port
    
    EXPOSE 22 8080
    
    # supervisord start
    
    CMD ["/usr/bin/supervisord", "-c", "/etc/supervisord.conf"]

**2）tomcat.ini**

[root@docker tomcat]# cat tomcat.ini 
    [program:tomcat]
    command=/usr/local/tomcat/bin/catalina.sh run
    stdout_logfile=/usr/local/tomcat/logs/catalina.out
    stderr_logfile=/usr/local/tomcat/logs/catalina.out
    environment=JAVA_HOME="/usr/local/jdk1.8.0_202",JAVA_BIN="/usr/local/jdk1.8.0_202/bin"
    autorestart=false
    startsecs=30
    priority=1
    stopasgroup=true
    killasgroup=true

**3）tomcat软件包**

去官网下载即可，当然最好是已经做好调优的。

#### 3、构建镜像 ####

构建镜像

[root@docker tomcat]# docker build -t docker.mynexus.com/myimages/tomcat:8.5 . 
    ...... #中间省略n行输出
    Successfully built d7dcd3f88433
    Successfully tagged docker.mynexus.com/myimages/tomcat:8.5

用镜像构建容器并验证

[root@docker tomcat]# docker run -d --name centos7-tomcat -p 8080:8080 -p 5522:22 docker.mynexus.com/myimages/tomcat:8.5 
    b01b167aec586f6794bd992403c551730661f3af76ff50781b3263214ee43e16
    
    [root@docker tomcat]# docker ps
    CONTAINER ID        IMAGE                                    COMMAND                  CREATED              STATUS              PORTS                                          NAMES
    b01b167aec58        docker.mynexus.com/myimages/tomcat:8.5   "/usr/bin/supervisor…"   About a minute ago   Up About a minute   0.0.0.0:8080->8080/tcp, 0.0.0.0:5522->22/tcp   centos7-tomcat
    
    [root@docker tomcat]# ssh root@192.168.0.151 -p 5522
    root@192.168.0.151's password: 
    [root@b01b167aec58 ~]# supervisorctl status tomcat
    tomcat                           RUNNING   pid 8, uptime 0:03:53

## 四、构建Jenkins镜像 ##

#### 1、思路 ####

思路：直接将war包放到tomcat目录下。

#### 2、文件 ####

需要三个文件。

[root@docker jenkins]# ls
    apache-maven-3.6.1-bin.tar.gz  Dockerfile  ROOT.war

apache-maven-3.6.1-bin.tar.gz为maven的压缩包，ROOT.war是Jenkins的war包，版本为2.213。

**1）Dockerfile**

[root@docker jenkins]# cat Dockerfile
    # Docker for CentOS
    
    # Base image
    FROM docker.mynexus.com/myimages/tomcat:8.5
    
    # Who
    MAINTAINER wangchao xxx@163.com
    
    # Maven
    ADD apache-maven-3.6.1-bin.tar.gz /usr/local/
    
    # Jenkins
    ADD ROOT.war /usr/local/tomcat/webapps/
    
    # ENV
    ENV JAVA_HOME /usr/local/jdk1.8.0_202
    ENV MAVEN_HOME /usr/local/apache-maven-3.6.1
    ENV JENKINS_HOME /home/.jenkins
    ENV PATH $PATH:$JAVA_HOME/bin:$MAVEN_HOME/bin
    
    # Outside Port
    EXPOSE 22 8080
    
    # supervisord start
    CMD ["/usr/bin/supervisord", "-c", "/etc/supervisord.conf"]

#### 3、构建镜像 ####

构建镜像

[root@docker jenkins]# docker build -t docker.mynexus.com/myimages/jenkins:2.213 .
    ...... #中间省略n行输出
    Successfully built b7692f1a5dea
    Successfully tagged docker.mynexus.com/myimages/jenkins:2.213

启动

[root@docker home]# docker run -d -p 6622:22 -p 9080:8080 --name jenkins -v /home/.jenkins:/home/.jenkins -v /usr/bin/docker:/usr/bin/docker -v /var/run/docker.sock:/var/run/docker.sock docker.mynexus.com/myimages/jenkins:2.213
    1d4d28476edc698bf2e760230a876f48062669264700c2b38478942ba8657525

这样将宿主机的目录挂载到容器中，即使这个jenkins容器在运行的过程中挂了，但是数据还是在的，重启之后，还是可以放心店的使用的。

启动之后，浏览器访问下

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djMTY5NTA0MDg0Mg_size_16_color_FFFFFF_t_70]

这个页面我们再熟悉不过了，很简单，直接去容器中获取密码

[root@docker home]# docker exec -it jenkins bash 
    [root@1d4d28476edc yum.repos.d]# cat /home/.jenkins/secrets/initialAdminPassword
    58a9cb4da94a491989381a9c62d6b7b7

耐心等待，等安装完插件之后，我们把这个容器重新提交成为镜像，这样下次就可以拿来直接用了，不用再花时间进行安装了插件了。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djMTY5NTA0MDg0Mg_size_16_color_FFFFFF_t_70 1]

安装完插件之后，我们点击"使用admin账户继续"，等之后再设置admin的密码。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djMTY5NTA0MDg0Mg_size_16_color_FFFFFF_t_70 2]

OK，进来了，这个时候我们去修改下admin的密码为admin123，改好密码之后，这时候我们重新提交成为镜像。以后可以直接用这个镜像，登录用户名密码为admin/admin123。

**获取Container ID**

[root@docker home]# docker ps
    CONTAINER ID        IMAGE                                       COMMAND                  CREATED             STATUS              PORTS                                          NAMES
    1d4d28476edc        docker.mynexus.com/myimages/jenkins:2.213   "/usr/bin/supervisor…"   35 minutes ago      Up 35 minutes       0.0.0.0:6622->22/tcp, 0.0.0.0:9080->8080/tcp   jenkins

**提交新的镜像**

[root@docker home]# docker commit -m "jenkins login" 1d4d28476edc docker.mynexus.com/myimages/jenkins:2.213-login
    sha256:0ceb3de8ca91c9483c9dbd33b427ffab7f4a198eb2350f04903ef4390aad31f6

哈哈，现在可以直接使用的Jenkins镜像诞生了，赶紧来创建一个容器。

[root@docker home]# docker run -d -p 7722:22 -p 9180:8080 --name jenkins-login -v /home/.jenkins:/home/.jenkins -v /usr/bin/docker:/usr/bin/docker -v /var/run/docker.sock:/var/run/docker.sock docker.mynexus.com/myimages/jenkins:2.213-login
    ae99786b0e94c13d7487a09e2bdc99540cd300cbe89dd5f47a2d6d23a259daef

访问Jenkins容器，用admin/admin123进行登录。

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djMTY5NTA0MDg0Mg_size_16_color_FFFFFF_t_70 3]

把镜像push到私服中，以后可以直接用

[root@docker home]# docker push docker.mynexus.com/myimages/jenkins:2.213-login

参考文章：  
[http://k8s.unixhot.com/docker/docker-image.html\#app-jenkins][http_k8s.unixhot.com_docker_docker-image.html_app-jenkins]  
[http://www.eryajf.net/2030.html][http_www.eryajf.net_2030.html]

[supervisor]: https://blog.csdn.net/wc1695040842/article/details/103988813
[jdk]: https://www.oracle.com/technetwork/java/javase/downloads/java-archive-javase8-2177648.html
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[http_k8s.unixhot.com_docker_docker-image.html_app-jenkins]: http://k8s.unixhot.com/docker/docker-image.html#app-jenkins
[http_www.eryajf.net_2030.html]: http://www.eryajf.net/2030.html