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docker 容器内服务随容器自动启动

docker 容器内服务随容器自动启动

1. 背景

使用docker运行带有nginx服务的容器。容器启动后，每次都需要手动进入容器内启动nginx服务。修改容器，让nginx服务随容器自动启动。

2. 准备工作

  • 使用原nginx-sj: latest镜像文件运行一个容器 nginx-sj: latest 是我之前使用，已修改的官方nginx镜像文件。
[root@centos7-10~]# docker run -it nginx-sj:latest /bin/bash
root@4eb5280856a3:/#
  • 查看用户目录下.bashrc文件
root@4eb5280856a3:~# pwd
/root
root@4eb5280856a3:~# ls -a
....bash_history  .bashrc  .profile  .viminfo

3. 方式一，直接修改.bashrc文件（简单粗暴）

  • 直接将服务启动命名写入.bashrc文件，见下
root@4eb5280856a3:~# vim /root/.bashrc

# ~/.bashrc: executed by bash(1)for non-login shells.

# Note:PS1 and umask are already setin/etc/profile. You should not
# need this unless you want different defaults for root.
# PS1='${debian_chroot:+($debian_chroot)}\h:\w\$ '
# umask 022

# You may uncomment the following lines if you want 'ls' to be colorized:
# exportLS_OPTIONS='--color=auto'
# eval "$(dircolors)"
# alias ls='ls $LS_OPTIONS'
# alias ll='ls $LS_OPTIONS -l'
# alias l='ls $LS_OPTIONS -lA'
#
# Some more alias to avoid making mistakes:
# alias rm='rm -i'
# alias cp='cp -i'
# alias mv='mv -i'

############################################
# start nginx 
if[-f /etc/init.d/nginx ]; then
        /etc/init.d/nginx start
fi

4. 方式二，编写启动脚本加入.bashrc文件（文明一点）

  • 编辑一个start_nginx.sh文件
root@4eb5280856a3:/# vim /root/start_nginx.sh
  • 写入以下内容，并保存
#!/bin/bash

service nginx start 
#service mysql start    //也可以添加其它服务
  • 添加start_nginx.sh脚本执行权限
root@4eb5280856a3:/# chmod +x /root/start_nginx.sh
  • 将启动脚本写入.bashrc文件
root@4eb5280856a3:~# vim /root/.bashrc

# ~/.bashrc: executed by bash(1)for non-login shells.

# Note:PS1 and umask are already setin/etc/profile. You should not
# need this unless you want different defaults for root.
# PS1='${debian_chroot:+($debian_chroot)}\h:\w\$ '
# umask 022

# You may uncomment the following lines if you want 'ls' to be colorized:
# exportLS_OPTIONS='--color=auto'
# eval "$(dircolors)"
# alias ls='ls $LS_OPTIONS'
# alias ll='ls $LS_OPTIONS -l'
# alias l='ls $LS_OPTIONS -lA'
#
# Some more alias to avoid making mistakes:
# alias rm='rm -i'
# alias cp='cp -i'
# alias mv='mv -i'

############################################
# start nginx 
if[-f /root/start_nginx.sh ]; then
        /root/start_nginx.sh
fi

5. 导出容器制作镜像

  • 将当前容器（4eb5280856a3）导出成文件nginx-sj_20240222.tar
root@4eb5280856a3:~# exit
exit
[root@centos7-10~]# docker ps -a
CONTAINERIDIMAGECOMMANDCREATEDSTATUSPORTSNAMES
4eb5280856a3   nginx-sj:latest   "/bin/bash"32 minutes ago   Up 30 minutes             vibrant_mcnulty
[root@centos7-10~]# docker export-o nginx-sj_20240222.tar 4eb5280856a3
[root@centos7-10~]#
  • 删除当前容器（4eb5280856a3）
[root@centos7-10~]# docker ps -a
CONTAINERIDIMAGECOMMANDCREATEDSTATUSPORTSNAMES
4eb5280856a3   nginx-sj:latest   "/bin/bash"34 minutes ago   Up 32 minutes             vibrant_mcnulty
[root@centos7-10~]# docker stop 4eb5280856a3
4eb5280856a3
[root@centos7-10~]# docker container prune
WARNING! This will remove all stopped containers.
Are you sure you want to continue?[y/N] y
Deleted Containers:
4eb5280856a32b83046e8e3be0393028a1a3f328887a11c0ccff15384660f86e

Total reclaimed space:7.293kB
[root@centos7-10~]#
  • 删除旧nginx-sj:latest镜像
[root@centos7-10~]# docker images
REPOSITORYTAGIMAGEIDCREATEDSIZE
nginx-sj     latest    3e97da40406a   About an hour ago   216MB
ubuntu22     latest    caac235feb32   About an hour ago   338MB
busybox      latest    beae173ccac6   2 years ago         1.24MB
redis        latest    7614ae9453d1   2 years ago         113MB
[root@centos7-10~]# docker rmi nginx-sj:latest 
Untagged: nginx-sj:latest
Deleted: sha256:3e97da40406a0daaa4d8c0d948b4c3a8a3d099b3aadb0d9fe8a2be4389bd52e6
[root@centos7-10~]#
  • 导入创建新nginx-sj: latest镜像，新镜像ID：283bb24f8ff4
[root@centos7-10~]# docker import nginx-sj_20240222.tar nginx-sj:latest
sha256:283bb24f8ff40c67a5ff9d33386847182567f688d7b1b4b109c17054e661b947
[root@centos7-10~]# docker images -a nginx-sj:latest 
REPOSITORYTAGIMAGEIDCREATEDSIZE
nginx-sj     latest    283bb24f8ff4   About a minute ago   216MB
[root@centos7-10~]#

6. 测试导出容器，nginx服务随容器自动启动

  • 启动容器，宿主机发布端口：9090，容器内服务端口：80
[root@centos7-10~]# docker run -itd --rm  -p 9090:80 nginx-sj:latest /bin/bash
562e64af48bbb26f95f3bf3fd01a3550898ca05292f8d95b9bf604c2000d2953
CONTAINERIDIMAGECOMMANDCREATEDSTATUSPORTSNAMES
562e64af48bb   nginx-sj:latest   "/bin/bash"3 minutes ago   Up 3 minutes   0.0.0.0:9090->80/tcp,:::9090->80/tcp   nervous_golick
[root@centos7-10~]#
  • 宿主机已监听端口9090
  • 宿主机IP 10.211.55.10
[root@centos7-10~]# netstat -ntlp | grep 9090
tcp        000.0.0.0:90900.0.0.0:*LISTEN17044/docker-proxy  
tcp6       00:::9090:::*LISTEN17050/docker-proxy  
[root@centos7-10~]# ip a show enp0s5
2: enp0s5:<BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:1c:42:ae:b6:41 brd ff:ff:ff:ff:ff:ff
    inet 10.211.55.10/24 brd 10.211.55.255 scope global noprefixroute dynamic enp0s5
       valid_lft 1140sec preferred_lft 1140sec
    inet6 fdb2:2c26:f4e4:0:233e:38df:2cbd:cec1/64 scope global noprefixroute dynamic 
       valid_lft 2591662sec preferred_lft 604462sec
    inet6 fe80::7e0c:1902:e1ca:4324/64 scope link tentative noprefixroute dadfailed 
       valid_lft forever preferred_lft forever
    inet6 fe80::567a:248b:5e94:5d19/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
  • 访问宿主机HTTP://10.211.55.10:9090，成功！在这里插入图片描述

7. 方式三，修改镜像默认值，COMMIT生成新镜像（正规方式）

修改镜像默认值，方式详见官方文档：Overriding image defaults

  • 修改镜像Cmd默认值（之前是null） - nginx -g “daemon off;”
[root@centos7-10~]# docker run -itd -p 9090:80 nginx-sj:latest  nginx -g "daemon off;"
c90c3a7d8e56ea15017fdfa2dfe9b88d398dcfe16f76b9723f0eb884208d6999
  • 提交生成新镜像：nginx-sj:1
[root@centos7-10~]# docker commit -m "nginx start" c9 nginx-sj:1sha256:94fa4087e73dd3c5440f7538d57dcd2f80938e0f9e8f87d48a866f7542f3d685
[root@centos7-10~]# docker images
REPOSITORYTAGIMAGEIDCREATEDSIZE
nginx-sj     1         94fa4087e73d   12 seconds ago   216MB
nginx-sj     2         355dbfe22182   30 minutes ago   216MB
nginx-sj     latest    283bb24f8ff4   25 hours ago     216MB
  • 查看新镜像nginx-sj:1信息 - “Cmd”: [ “nginx”, “-g”, “daemon off;” ],
[root@centos7-10~]# docker image inspect nginx-sj:1[{"Id":"sha256:94fa4087e73dd3c5440f7538d57dcd2f80938e0f9e8f87d48a866f7542f3d685","RepoTags":["nginx-sj:1"],"RepoDigests":[],"Parent":"sha256:283bb24f8ff40c67a5ff9d33386847182567f688d7b1b4b109c17054e661b947","Comment":"nginx start","Created":"2024-02-23T09:55:38.972444927Z","Container":"c90c3a7d8e56ea15017fdfa2dfe9b88d398dcfe16f76b9723f0eb884208d6999","ContainerConfig":{"Hostname":"c90c3a7d8e56",......"Config":{"Hostname":"c90c3a7d8e56","Domainname":"","User":"","AttachStdin":false,"AttachStdout":false,"AttachStderr":false,"ExposedPorts":{"80/tcp":{}},"Tty":true,"OpenStdin":true,"StdinOnce":false,"Env":null,"Cmd":["nginx","-g","daemon off;"],"Image":"nginx-sj:latest","Volumes":null,"WorkingDir":"","Entrypoint":null,"OnBuild":null,"Labels":{}},......}}]
  • 运行容器进行验证
[root@centos7-10~]# docker run -itd -p 9000:80 nginx-sj:1 
eae91339bf57739cec9fbbd63890afd8949977eae0a561226109b1f02fd66051
[root@centos7-10~]# docker ps -a
CONTAINERIDIMAGECOMMANDCREATEDSTATUSPORTSNAMES
eae91339bf57   nginx-sj:1"nginx -g 'daemon of…"5 seconds ago   Up 4 seconds   0.0.0.0:9000->80/tcp,:::9000->80/tcp   modest_cartwright
  • 宿主机已经监听9000端口–>容器内nginx服务80端口
[root@centos7-10~]# netstat -ntlp | grep 9000
tcp        000.0.0.0:90000.0.0.0:*LISTEN14995/docker-proxy  
tcp6       00:::9000:::*LISTEN15001/docker-proxy
  • 外部访问HTTP://10.211.55.10:9000，成功。在这里插入图片描述

8. 方式四，与方案三类似

  • 修改镜像默认值，也可以组合修改ENTRYPOINT 和 CMD。修改方式如下:
[root@centos7-10~]# docker run -itd --entrypoint /usr/sbin/nginx nginx-sj:latest -g "daemon off;"

ENTRYPOINT 与 CMD 关系及使用方式详见官方文档：Understand how CMD and ENTRYPOINT interact

  • 生存新镜像方式同方案三

说明：因为docker run 命令中–entrypoint 只支持string，所以建议将服务启动命令写成shell脚本（同方案二），然后使用–entrypoint 引入更合理

9. 方式五，使用DOCKERFILE重新BUILTD新镜像（永久使用方式）

  • 创建一个dockerfile文件
[root@centos7-10~]# mkdir nginx-sj
[root@centos7-10~]# cd nginx-sj
[root@centos7-10~]# vim dockerfile-nginx
  • 输入以下内容并保存 - FROM nginx-sj:latest # 基础镜像- MAINTAINER # 维护信息- CMD [“nginx”,“-g”,“daemon off;”] # 容器启动执行的默认命令
FROM nginx-sj:latest
MAINTAINER shijin
CMD["nginx","-g","daemon off;"]~~
wq!
  • 使用dockerfile文件创建新镜像 - -f dockerfile-nginx dockerfile文件名称（注意路径，测试在当前目录下）- -t nginx-sj:2024022601 镜像的名称与tag- . 指定镜像构建过程中的上下文环境
[root@centos7-10~]# docker build -f dockerfile-nginx -t nginx-sj:2024022601.
  • 查看构建镜像结果
[root@centos7-10 nginx-sj]# docker images
REPOSITORYTAGIMAGEIDCREATEDSIZE
nginx-sj     2024022601   64b3c38d4483   36 minutes ago   216MB

[root@centos7-10 nginx-sj]# docker history  nginx-sj:2024022601IMAGECREATEDCREATEDBYSIZECOMMENT
64b3c38d4483   53 minutes ago   CMD["nginx""-g""daemon off;"]   0B        buildkit.dockerfile.v0
<missing>53 minutes ago   MAINTAINER shijin                  0B        buildkit.dockerfile.v0
<missing>53 minutes ago                                      216MB     Imported from -

总结：

  1. 如果临时使用，可以采用方式一、二，从容器中导出；
  2. 如果不频繁变更，可以采用方式三、四，直接commit生成新镜像；
  3. 如果要长期或永久使用，建议采用方式五，彻底重新build新镜像。
标签： docker 容器 运维
本文转载自: https://blog.csdn.net/shijin741231/article/details/136237479
版权归原作者 石小千 所有， 如有侵权，请联系我们删除。
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