Docker的镜像制作小试验

1) 用docker commit 制作一个nginx镜像，定制主页文件

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root@ubuntu2204:~# apt update 
root@ubuntu2204:~# apt install -y docker.io 
root@ubuntu2204:~# docker pull nginx:1.24.0

root@ubuntu2204:~# docker images
REPOSITORY   TAG       IMAGE ID       CREATED         SIZE
nginx        1.24.0    6c0218f16876   13 months ago   142MBtu2204:~# docker pull nginx:1.24.0

root@ubuntu2204:~# docker run -d --name nginx -p 80:80 nginx:1.24.0
9d8f1f98879be8b561f29dd78aa4291e3e8c3adc44b3313fc909bb6ecb12fee6

root@ubuntu2204:~# docker ps
CONTAINER ID   IMAGE          COMMAND                  CREATED         STATUS         PORTS                               NAMES
9d8f1f98879b   nginx:1.24.0   "/docker-entrypoint.…"   2 minutes ago   Up 2 minutes   0.0.0.0:80->80/tcp, :::80->80/tcp   nginx

root@ubuntu2204:~# docker exec -it nginx bash
root@9d8f1f98879b:/# nginx -T
root@9d8f1f98879b:/# echo "My Nginx images with nginx:1.24.0" > /usr/share/nginx/html/index.html 
root@9d8f1f98879b:/# cat /usr/share/nginx/html/index.html
My Nginx images with nginx:1.24.0
root@9d8f1f98879b:/# exit

root@ubuntu2204:~# curl 10.0.0.7
My Nginx images with nginx:1.24.0

root@ubuntu2204:~# docker commit  nginx mynginx:1.24.0
sha256:6cdae199f0ed257a7725af4f11a33a962fe7d23eb72db849b5755d62f7cb13b8

root@ubuntu2204:~# docker images
REPOSITORY   TAG       IMAGE ID       CREATED         SIZE
mynginx      1.24.0    6cdae199f0ed   8 seconds ago   142MB
nginx        1.24.0    6c0218f16876   13 months ago   142MB

2) 用docker build 基于alpine镜像,自定义镜像Label\

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root@ubuntu2204:~# mkdir -p /data/dockerfile/alpine
root@ubuntu2204:~# cd /data/dockerfile/alpine

root@ubuntu2204:/data/dockerfile/alpine# vim Dockerfile
FROM alpine:20240329
LABEL Author=xcjyc Description="docker build" Data="2024-05-22" 

root@ubuntu2204:/data/dockerfile/alpine# docker build -t myalpine:for20240329 .
DEPRECATED: The legacy builder is deprecated and will be removed in a future release.
            Install the buildx component to build images with BuildKit:
            https://docs.docker.com/go/buildx/

Sending build context to Docker daemon  2.048kB
Step 1/2 : FROM alpine:20240329
20240329: Pulling from library/alpine
4edfc05e3af2: Pull complete 
Digest: sha256:e31c3b1cd47718260e1b6163af0a05b3c428dc01fa410baf72ca8b8076e22e72
Status: Downloaded newer image for alpine:20240329
 ---> 49b3cb3043cd
Step 2/2 : LABEL Author=xcjyc Description="docker build" Data="2024-05-22"
 ---> Running in 2fc73db792f6
Removing intermediate container 2fc73db792f6
 ---> d1a87b0d00c6
Successfully built d1a87b0d00c6
Successfully tagged myalpine:for20240329

3）Dockerfile 加入一个前台持续执行的进程

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root@ubuntu2204:/data/dockerfile/alpine# cat Dockerfile 
FROM alpine:20240329
LABEL Author=xcjyc Description="docker build" Data="2024-05-22"
CMD tail -f /etc/hosts