Iptables: LOG target not working in LXD containers

If you're using LXD, you may be surprised that you're not getting packets logged with iptables' LOG target. Or, not really surprised - since the LOG target is kernel logging, and LXD containers are pretty much limited when it comes to accessing various kernel functions, for security reason.

A workaround is to use NFLOG target and ulogd2:

So if your rules looked like below:

Then just change LOG target to NFLOG:

Then, ulogd2 will write the logs to /var/log/ulog/ directory, i.e.:

Also, please note that ULOG target was deprecated (you'll still find a lot of info about it) - you need to use NFLOG instead.