docker复习1
·
docker镜像搭建原理：
最底层是操作系统底层文件，往上一层一层加自己需要的镜像构建自己需要的镜像。
镜像构建企业示例
1.解决镜像安装源问题
镜像安装问题
解决镜像问题
[root@rhel ~]# mkdir /dockerbuild
[root@rhel ~]# ls
anaconda-ks.cfg centos-7.tar.gz
[root@rhel ~]# cd /dockerbuild/
[root@rhel dockerbuild]# vim centos.rep0
[root@rhel dockerbuild]# vim Dockerfile
[root@rhel dockerbuild]# cat centos.repo
[centos]
name = centos7.9
baseurl = https://mirrors.aliyun.com/centos-vault/7.9.2009/os/x86_64
gpgcheck = 0
[root@rhel dockerbuild]# cat Dockerfile
FROM centos:7
RUN rm -rf /etc/yum.repos.d/*
COPY centos.repo /etc/yum.repos.d/
RUN yum makecache
[root@rhel dockerbuild]# docker build -t centos-7.9:repo .
[+] Building 0.1s (7/8) docker:default
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 135B 0.0s
=> [internal] load metadata for docker.io/library/centos:7 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> [1/4] FROM docker.io/library/centos:7@sha256:e6dba3b9654d5ddd7b10848643c6971ec932bdb83801babc8773c190a6c24378 0.0s
=> => resolve docker.io/library/centos:7@sha256:e6dba3b9654d5ddd7b10848643c6971ec932bdb83801babc8773c190a6c24378 0.0s
=> [internal] load build context 0.0s
=> => transferring context: 2B 0.0s
=> CANCELED [2/4] RUN rm -rf /etc/yum.repos.d/* 0.1s
=> ERROR [3/4] COPY centos.repo /etc/yum.repos.d/ 0.0s
------
> [3/4] COPY centos.repo /etc/yum.repos.d/:
------
Dockerfile:3
--------------------
1 | FROM centos:7
2 | RUN rm -rf /etc/yum.repos.d/*
3 | >>> COPY centos.repo /etc/yum.repos.d/
4 | RUN yum makecache
5 |
--------------------
ERROR: failed to build: failed to solve: failed to compute cache key: failed to calculate checksum of ref acomavcgi09inobaamj12yt3x::mh55zhur4fqq6tf62ec3lo2s4: "/centos.repo": not found
[root@rhel dockerbuild]# mv centos.reop centos.repo
docker build -t centos-7.9:repo .
[+] Building 12.7s (9/9) FINISHED docker:default
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 135B 0.0s
=> [internal] load metadata for docker.io/library/centos:7 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> CACHED [1/4] FROM docker.io/library/centos:7@sha256:e6dba3b9654d5ddd7b10848643c6971ec932bdb83801babc8773c190a6c24378 0.0s
=> => resolve docker.io/library/centos:7@sha256:e6dba3b9654d5ddd7b10848643c6971ec932bdb83801babc8773c190a6c24378 0.0s
=> [internal] load build context 0.0s
=> => transferring context: 146B 0.0s
=> [2/4] RUN rm -rf /etc/yum.repos.d/* 0.2s
=> [3/4] COPY centos.repo /etc/yum.repos.d/ 0.0s
=> [4/4] RUN yum makecache 9.6s
=> exporting to image 2.8s
=> => exporting layers 2.3s
=> => exporting manifest sha256:56cde605014fc839d38fe5bf21d849257a3279d95f74d39f29d4524392cec6db 0.0s
=> => exporting config sha256:a80f434d0520d97498027ea4b5a45ca56c6c1971724cb7d6dba5a6347dd6b9a5 0.0s
=> => exporting attestation manifest sha256:34b8044bf5568ec3ba25ae0bd0811818528f5254ec9ca7c86871cfa7f18a7a13 0.0s
=> => exporting manifest list sha256:45a0f8ccd2233ccfeffeb8de0cfb11457f7e180cca42f79f86efee4b91d7fd40 0.0s
=> => naming to docker.io/library/centos-7.9:repo 0.0s
=> => unpacking to docker.io/library/centos-7.9:repo 测试：
2.利用现有镜像构建企业所需业务
[root@rhel dockerbuild]# wget https://nginx.org/download/nginx-1.30.4.tar.gz
--2026-08-13 20:11:27-- https://nginx.org/download/nginx-1.30.4.tar.gz
正在解析主机 nginx.org (nginx.org)... 3.125.197.172, 2a05:d014:5c0:2601::6, 2a05:d014:5c0:2600::6
正在连接 nginx.org (nginx.org)|3.125.197.172|:443... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：1328314 (1.3M) [application/octet-stream]
正在保存至: “nginx-1.30.4.tar.gz”
nginx-1.30.4.tar.gz 100%[====================================================================================================================>] 1.27M 45.6KB/s 用时 36s
2026-08-13 20:12:05 (35.7 KB/s) - 已保存 “nginx-1.30.4.tar.gz” [1328314/1328314])
[root@rhel dockerbuild]# vim Dockerfile
[root@rhel dockerbuild]# cat Dockerfile
FROM centos-7.9:repo
ADD nginx-1.30.4.tar.gz /mnt
WORKDIR /mnt/nginx-1.30.4
RUN sed -i 's/CFLAGS="$CFLAGS -g"/#CFLAGS="$CFLAGS -g"/g' auto/cc/gcc
RUN yum install gcc make pcre-devel openssl-devel -y
RUN ./configure --with-http_ssl_module --with-http_stub_status_module
RUN make && make install
EXPOSE 80
VOLUME ["/usr/local/nginx/html"]
CMD ["/usr/local/nginx/sbin/nginx", "-g", "daemon off;"]
[root@rhel dockerbuild]# docker build -t nginx-lee:v1 .
[root@rhel dockerbuild]# docker images
i Info → U In Use
IMAGE ID DISK USAGE CONTENT SIZE EXTRA
centos-7.9:repo 45a0f8ccd223 591MB 250MB
centos:7 e6dba3b9654d 434MB 212MB
nginx-lee:v1 2017cd7974c0 715MB 282MB
[root@rhel dockerbuild]#
测试：
[root@rhel dockerbuild]# docker run -d --rm -p 80:80 nginx-lee:v1
89502d2726dedff795065033ec79c744db90fa0cca8769ce9e52a2bf0456da63
[root@rhel dockerbuild]# curl 172.25.254.100
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, nginx is successfully installed and working.
Further configuration is required for the web server, reverse proxy,
API gateway, load balancer, content cache, or other features.</p>
<p>For online documentation and support please refer to
<a href="https://nginx.org/">nginx.org</a>.<br/>
To engage with the community please visit
<a href="https://community.nginx.org/">community.nginx.org</a>.<br/>
For enterprise grade support, professional services, additional
security features and capabilities please refer to
<a href="https://f5.com/nginx">f5.com/nginx</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
[root@rhel dockerbuild]# docker exec 89502d2726de /usr/local/nginx/sbin/nginx -v
nginx version: nginx/1.30.4
[root@rhel dockerbuild]#
3.构建镜像优化方案
a.缩减镜像层
[root@docker-node1 dockerbuild]# vim Dockerfile
FROM centos-7.9:localrepo
ADD nginx-1.30.4.tar.gz /mnt
WORKDIR /mnt/nginx-1.30.4
RUN sed -i 's/CFLAGS="$CFLAGS -g"/#CFLAGS="$CFLAGS -g"/g' auto/cc/gcc && yum install gcc make pcre-devel openssl-devel -y && ./configure --with-http_ssl_module --with-http_stub_status_module && make && make install
EXPOSE 80
VOLUME ["/usr/local/nginx/html"]
CMD ["/usr/local/nginx/sbin/nginx", "-g", "daemon off;"]b.删除构建过程中需要的临时文件
[root@docker-node1 dockerbuild]# vim Dockerfile
FROM centos-7.9:localrepo
ADD nginx-1.30.4.tar.gz /mnt
WORKDIR /mnt/nginx-1.30.4
RUN sed -i 's/CFLAGS="$CFLAGS -g"/#CFLAGS="$CFLAGS -g"/g' auto/cc/gcc && yum install gcc make pcre-devel openssl-devel -y && ./configure --with-http_ssl_module --with-http_stub_status_module && make && make install && rm -fr /mnt/* && yum clean all
EXPOSE 80
VOLUME ["/usr/local/nginx/html"]
CMD ["/usr/local/nginx/sbin/nginx", "-g", "daemon off;"]c.多阶构建
[root@docker-node1 dockerbuild]# vim Dockerfile
FROM centos-7.9:localrepo AS build
ADD nginx-1.30.4.tar.gz /mnt
WORKDIR /mnt/nginx-1.30.4
RUN sed -i 's/CFLAGS="$CFLAGS -g"/#CFLAGS="$CFLAGS -g"/g' auto/cc/gcc && yum install gcc make pcre-devel openssl-devel -y && ./configure --with-http_ssl_module --with-http_stub_status_module && make && make install && rm -fr /mnt/* && yum clean all
FROM centos:7
COPY --from=build /usr/local/nginx /usr/local/nginx
EXPOSE 80
VOLUME ["/usr/local/nginx/html"]
CMD ["/usr/local/nginx/sbin/nginx", "-g", "daemon off;"]
openEuler 是由开放原子开源基金会孵化的全场景开源操作系统项目，面向数字基础设施四大核心场景（服务器、云计算、边缘计算、嵌入式），全面支持 ARM、x86、RISC-V、loongArch、PowerPC、SW-64 等多样性计算架构
更多推荐
1
0- 0
已为社区贡献2条内容
所有评论(0)