systemctl journals filling up your disk

Quick one … your system probably uses logrotate to keep a fixed number of logs, and which stops your disk filling up. Trouble is, that systemctl doesn’t write logs in the normal way so you can’t rely on logrotate any more. Check out your current systemctl log usage with journalctl –disk-usage Wait, whaaaat? Its using … Read more

Letsencrypt Wildcard Certificates, with acme.sh client

Took me a bit of time to figure this out, so I thought I’d make it public. Letsencrypt announced their new wildcard certs, and because I have to add the SSL cert to a load balancer covering many subdomains, I needed to make use of it.

First thing to note is that not all clients support the new v2 API which is required for wildcard certs. I looked at the list of v2 supporting clients on the Letsencrypt site, and chose the acme.sh bash script. Not sure if I’m going to stick with it at this point but it got me going.

First thing you need to do is to run it with the –issue flag. You’ll need to run it with DNS authentication, as that’s the supported method for wildcard certs. You’ll also need to run it with both the root domain AND the wildcard.

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Switch from UFW and fail2ban to CSF

Having played with CSF for a while on one server, I’ve decided I like it more than UFW and fail2ban. It seems much better at blocking mail bruteforce attacks and SSH as a distributed attack. So anyway, here’s a list of steps to achieve that, as much for my record as anything. The server is running Ubuntu 16.04, but these general steps should work anywhere. In addition the server I did it on is also running VestaCP, so there are a couple more steps for that.

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Bash script to clean Bots out of Apache Logs

If you’ve ever spent some time looking at webserver logs, you know how much crap there is in there from crawlers, bots, indexers, and all the bottom feeders of the internet. If you’re looking for a specific problem with the webserver, this stuff can quickly become a nuisance, stopping you from finding the information you … Read more