/ # apk add curl
fetch https://dl-cdn.alpinelinux.org/alpine/v3.19/community/x86_64/x86_64/APKINDEX.tar.gz
WARNING: updating and opening https://dl-cdn.alpinelinux.org/alpine/v3.19/community/x86_64/: No such file or directory
fetch https://dl-cdn.alpinelinux.org/alpine/v3.19/main/x86_64/x86_64/APKINDEX.tar.gz
WARNING: updating and opening https://dl-cdn.alpinelinux.org/alpine/v3.19/main/x86_64/: No such file or directory
ERROR: unable to select packages:
  curl (no such package):
    required by: world[curl]

apk update

apk add xxx

都无法执行。

解决

更换使用下面源：

vi /etc/apk/repositories

https://mirror.reenigne.net/alpine/edge/community/
https://mirror.reenigne.net/alpine/edge/main/
https://mirror.reenigne.net/alpine/edge/testing/

https://mirror.reenigne.net/alpine/v3.19/main/
https://mirror.reenigne.net/alpine/v3.19/community/

如果还不行： vi /etc/resolv.conf  

meserver 8.8.8.8
nameserver 114.114.114.114
nameserver 127.0.0.53
nameserver 223.5.5.5
options edns0

第二步没有再验证，不确定有效 。