It has been a while since my last blog post, but there was no real foo happening to me during that time. But this issue really gave me some heartburn. Let’s start with the general setup. We have a Linux VM in an OpenVZ environment. The hoster is Strato in Germany, but I don’t think… Continue reading OpenVPN in Ubuntu 18.04 Foo within OpenVZ Container (Strato)
Category: Linux
OpenVPN 2.4 CRL Expired Foo
I chose a nice Friday evening and a good Scotch to upgrade an older Ubuntu LTS to the latest and greatest. And all went well, until I wanted to connect one of the clients via VPN. All I saw was this nasty little line in the log files of the server … VERIFY ERROR: depth=0,… Continue reading OpenVPN 2.4 CRL Expired Foo
Send Email from the Command Line using an External SMTP Server
Sending email in Linux is pretty straight forward, once an email server is set up. Just use mutt or mail and all is good. But sometimes you actually want to test if SMTP is working correctly. And not only on your box, but on a remote box. That is of course easy using a MUA… Continue reading Send Email from the Command Line using an External SMTP Server
MySQL max_connections limited to 214 on Ubuntu Foo
After moving a server to a new machine with Ubuntu 16.10 I received some strange Postfix SMTP errors. Which turned out to be a connection issue to the MySQL server: postfix/cleanup[30475]: warning: connect to mysql server 127.0.0.1: Too many connections Oops, did I forgot to up max_connections during the migration:
Check SSL Connection Foo
It was that time of the year, when I had to renew some SSL certificates. Renewing and updating them in the server is a nice and easy process. But checking, whether the server is delivering the correct certificate and, that I updated and popluated the intermediate certificates correctly, is a different story.
Nagios Enabling External Command on Debian based Distributions
While debugging my check disk problem after the 15.10 upgrade, I saw that I forgot to enable external commands. That is handy, when you want to re-schedule a check to see, if your changes took effect. Again, something that is easily activated. So if you see something like this, then you might want to make… Continue reading Nagios Enabling External Command on Debian based Distributions
Nagios check_disk Foo on Ubuntu 15.10
Another day another foo, this time done to the check_disk plugin for Nagios on Ubuntu. After updating to 15.10 my disk space check all of a sudden failed with this one here: DISK CRITICAL – /sys/kernel/debug/tracing is not accessible: Permission denied
Automatic Ubuntu Kernel Clean Up Foo (Update)
Cleaning up old kernel images on a Ubuntu machine is a quite annoying task. If you forget it and you have a separate /boot partition, then you will sooner or later run out of disk space. And then of course all your updates will fail. Doing the clean up manually is, as mentioned, more than… Continue reading Automatic Ubuntu Kernel Clean Up Foo (Update)
Too Many Open Files Foo With Chrome On Ubuntu 13.10
The last Chrome update and one of the last Thunderbird updates caused some strange crashes of either on of them on my Ubuntu 13.10. All is fine, it runs great and all of a sudden *boom*, browser window gone, or email client gone. Luckily .xsession-errors exists and there I could find some entries like this:… Continue reading Too Many Open Files Foo With Chrome On Ubuntu 13.10
PS3 Media Server And Ubuntu Foo… Again
It feels like Groundhog Day all over again. After finding a relatively painless way of installing the PS3 Media Server on Ubuntu (PS3 Media Server And Ubuntu Foo), I found an easy way with a PPA (PS3 Media Server made easy) and I thought all will be good when I do the re-install of my… Continue reading PS3 Media Server And Ubuntu Foo… Again