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alpine源配置

问题

默认alpine源地址可通过/etc/apk/repositories文件查看

$ docker run -it alpine
/ # cd /etc/apk/
/etc/apk # pwd
/etc/apk
/etc/apk # ls
arch               keys               protected_paths.d  repositories       world
/etc/apk # 
/etc/apk # cat repositories 
http://dl-cdn.alpinelinux.org/alpine/v3.11/main
http://dl-cdn.alpinelinux.org/alpine/v3.11/community

使用默认源无法下载应用，以NodeJS为例

/etc/apk # apk add nodejs
fetch http://dl-cdn.alpinelinux.org/alpine/v3.11/main/x86_64/APKINDEX.tar.gz
ERROR: http://dl-cdn.alpinelinux.org/alpine/v3.11/main: temporary error (try again later)
WARNING: Ignoring APKINDEX.70f61090.tar.gz: No such file or directory
fetch http://dl-cdn.alpinelinux.org/alpine/v3.11/community/x86_64/APKINDEX.tar.gz
ERROR: http://dl-cdn.alpinelinux.org/alpine/v3.11/community: temporary error (try again later)
WARNING: Ignoring APKINDEX.ca2fea5b.tar.gz: No such file or directory
ERROR: unsatisfiable constraints:
  nodejs (missing):
    required by: world[nodejs]

解析

参考Alpine Linux 源使用帮助，替换成国内镜像源

/etc/apk # sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories
/etc/apk # 
/etc/apk # cat repositories 
http://mirrors.ustc.edu.cn/alpine/v3.11/main
http://mirrors.ustc.edu.cn/alpine/v3.11/community

配置NodeJS环境如下

/etc/apk # apk add nodejs
fetch http://mirrors.ustc.edu.cn/alpine/v3.11/main/x86_64/APKINDEX.tar.gz
fetch http://mirrors.ustc.edu.cn/alpine/v3.11/community/x86_64/APKINDEX.tar.gz
(1/7) Installing ca-certificates (20191127-r1)
(2/7) Installing c-ares (1.15.0-r0)
(3/7) Installing libgcc (9.2.0-r3)
(4/7) Installing nghttp2-libs (1.40.0-r0)
(5/7) Installing libstdc++ (9.2.0-r3)
(6/7) Installing libuv (1.34.0-r0)
(7/7) Installing nodejs (12.15.0-r1)
Executing busybox-1.31.1-r9.trigger
Executing ca-certificates-20191127-r1.trigger
OK: 36 MiB in 21 packages
/etc/apk # 
/etc/apk # apk add npm
(1/1) Installing npm (12.15.0-r1)
Executing busybox-1.31.1-r9.trigger
OK: 64 MiB in 22 packages

dockerfile

编写一个Dockerfile脚本，实现镜像源替换

FROM alpine:latest
LABEL maintainer "zhujian <zjykzj@github.com>"

RUN set -eux && sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories

构建

$ docker build -t zjykzj/alpine:latest .
Sending build context to Docker daemon  2.048kB
Step 1/3 : FROM alpine:latest
 ---> e7d92cdc71fe
Step 2/3 : LABEL maintainer "zhujian <zjykzj@github.com>"
 ---> Running in b3f0f90e83f0
Removing intermediate container b3f0f90e83f0
 ---> 0dbd958abad8
Step 3/3 : RUN set -eux && sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories
 ---> Running in 8970b6e7de52
+ sed -i s/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g /etc/apk/repositories
Removing intermediate container 8970b6e7de52
 ---> 3de6fe078b8b
Successfully built 3de6fe078b8b
Successfully tagged zjykzj/alpine:latest

运行

$ docker run -it zjykzj/alpine
/ # node
/bin/sh: node: not found
/ # apk add nodejs
fetch http://mirrors.ustc.edu.cn/alpine/v3.11/main/x86_64/APKINDEX.tar.gz
fetch http://mirrors.ustc.edu.cn/alpine/v3.11/community/x86_64/APKINDEX.tar.gz
(1/6) Installing ca-certificates (20191127-r2)
(2/6) Installing c-ares (1.15.0-r0)
(3/6) Installing libgcc (9.3.0-r0)
(4/6) Installing nghttp2-libs (1.40.0-r1)
(5/6) Installing libstdc++ (9.3.0-r0)
(6/6) Installing nodejs (12.21.0-r0)
Executing busybox-1.31.1-r9.trigger
Executing ca-certificates-20191127-r2.trigger
OK: 37 MiB in 20 packages
/ # 
/ # node -v
v12.21.0