How it started

LXC container running alpine linux cannot resolve ip address when running ping. On the other hand drill resolved ip succesfully but nslookup exits with error

** server can't find metube.szajowski.dev: NXDOMAIN

There used to be an issue but it was resolved long time ago.

It turned out that my dns server that is hosted by mikrotik router had a bug that was resolved just recently :)

Used troubleshooting

• nslookup metube.szajowski.dev
• drill metube.szajowski.dev
• touch /etc/.pve-ignore.resolv.conf to prevent proxmox from overriding file on boot up
• cat /etc/pve/lxc/106.conf to review what are default options of container
• hardcode dns in /etc/resolv.conf
• set options ndots:1 in /etc/resolv.conf
• tcpdump -v -i eth0 port 53 to check how domain is resolved
• ping -4 metube.szajowski.dev pinged successfully
• added AAAA DNS record on mikrotik which actually ressolved issue

In the end simple upgrade of router did the trick

Links

• https://forum.mikrotik.com/viewtopic.php?t=192878#p981832
• https://bell-sw.com/blog/how-to-deal-with-alpine-dns-issues/