shell-things/etc/resolv.conf

# Don't do this, just run this instead:
#     sudo ln -sf /run/systemd/resolve/stub-resolv.conf /etc/resolv.conf
# Or look at the other scripts in this directory such as
#  resolv.conf-generate.bash - creates simpler version of this file without
#  the comments
#  systemd-resolv.conf-generate.bash - same as the above, but only users
#  127.0.0.53 as a nameserver
#  systemd-resolv.conf-restore.bash - restores/creates the symlink of line 2


# Problem: unbound is slow to start and everything complains of failing DNS,
# and systemd-resolved often gets itself stuck with DNSSEC.
# https://github.com/systemd/systemd/issues/10579 & https://github.com/systemd/systemd/issues/9867
# Solution that I dislike: use both unbound & systemd-resolved! When one
# breaks, maybe the other still works! Funnily /etc/resolv.conf is still
# restricted to three nameservers. However this may cause slowness unless
# the options timeout is specified and I increase attempts to further prefer
# unbound (which is listed twice).

# unbound or other local resolver
nameserver ::1
nameserver 127.0.0.1

# systemd-resolved. WARNING: May cause DNS leaks.
nameserver 127.0.0.53
# systemd-resolved DNS proxy (to upstream). No DNSSEC, no LLMNR, no mDNS!
#nameserver 127.0.0.54

# no sending local domain to upstream whenever NXDOMAIN happens
search .

# timeout:1 = nameserver timeout 1 s (default 5, max 30), then next
# attempts:5 = if all nameservers fail, attempt again 5 times (def 2, max 5)
# rotate = For long running processes that perform more than one query (so not
# dig/host), use the first resolver for the first query, second resolver for
# the second query, third resolver for the third query and repeat.
# They are all theoretically the same, except that NordVPN disables IPv6 so
# ::1 will fail and occassionally only systemd-resolved works and I am
# under the impression that some apps are aware of systemd-resolved and will
# use it directly bypassing resolv.conf. In other words while everything
# works, this affects nothing, and when unbound is down (before it's started
# on desktop?), every second query will be faster with every third reaching
# systemd-resolved instantly without the timeout of two seconds.
# edns0 = extended DNS
# trust-ad = trust DNSSEC authenticated data
options timeout:1 attempts:5 rotate edns0 trust-ad
# AMINDA! Remember, you are specifying these here, a couple of bash scripts
# in this directory, see the comment on top, ../rc/{bash,zsh}rc
# ($RES_OPTIONS) and systemd/system/service.d/resolv.conf !

# PS. Remove empty lines and comments if this ends up in /etc/resolv.conf
# PPS. The traditional spell is:
#    sudo chattr -i /etc/resolv.conf;sudo nvim /etc/resolv.conf;sudo chattr +i /etc/resolv.conf