DNS Problems

Sometimes, you can connect to your robot over ssh, so you know that the wifi is working correctly. And yet, git push and other commands are failing. This might be a problem DNS lookups.

Checking

There are many ways to check. One that checks specifically DNS is:

nslookup google.com

If this command hangs and times out with an error, this is good evidence that you have a problem with the DNS service.

Next check if the DNS service is working on your robot:

systemd-resolve --status

If that gives an error, then for some reason your DNS service has stopped. Try to restart it like this:

Restarting the service

sudo systemctl restart systemd-resolved

Verifying

If things are working you will see output like:

nslookup google.com # (1)
Server:         127.0.0.53
Address:        127.0.0.53#53

Non-authoritative answer:
Name:   google.com
Address: 142.250.80.78
Name:   google.com
Address: 2607:f8b0:4006:80c::200e

1: foobar