Ubuntu

OpenVPN in Ubuntu 18.04 Foo within OpenVZ Container (Strato)

  • peter 

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 that really matters. There are some known issues with the TUN device not being accessible within the VM, but Strato did their homework and I could see the module:

# lsmod | grep tun
tun                     4242  -2
vznetstat               4242  -2 tun,ip_vznetstat,ip6_vznetstat
Read More »OpenVPN in Ubuntu 18.04 Foo within OpenVZ Container (Strato)

Send Email from the Command Line using an External SMTP Server

  • peter 

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 like Thunderbird or Sylpheed, but that is not always feasible on a remote server in a remote network.

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Nagios Enabling External Command on Debian based Distributions

  • peter 

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 some changes:


Error: Could not stat() command file ‘/var/lib/nagios3/rw/nagios.cmd’!


The external command file may be missing, Nagios may not be running, and/or Nagios may not be checking external commands. An error occurred while attempting to commit your command for processing.
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