Document Fix for Alpine Mirror Problem: "temporary error (try again later)"

[osterman]

what

ERROR: http://dl-cdn.alpinelinux.org/alpine/v3.8/main: temporary error (try again later)
WARNING: Ignoring APKINDEX.adfa7ceb.tar.gz: No such file or directory
ERROR: http://dl-cdn.alpinelinux.org/alpine/v3.8/community: temporary error (try again later)
WARNING: Ignoring APKINDEX.efaa1f73.tar.gz: No such file or directory

why

• When running inside of EC2, the dl-cdn.alpinelinux.org domain fails to resolve to correct IPs.

fix

• Change your primary nameserver to some external DNS provider (e.g. cloudflare); we use 1.1.1.1, but 8.8.8.8 and 8.8.4.4 will also work well