Icinga is a fork of Nagios monitoring system. There are lots of changes and upgrades compared to Nagios, especially in version 2. The main visible difference is UI which is built on ext js. Other significant differences are in hosts and services definitions (it will be covered in part 2).
For this tutorial we’re going to use Digital Ocean smallest droplet with installed Debian 7.8.
Continue reading Installing Icinga2 (fork of Nagios) on Debian 7 (Wheezy)
Few days I ago, I had a funny situation. Colleague of mine accidentally executed:
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sudo chown -R www-data:www-data /* |
so instead for current directory ./* he changed owner for entire root file system. Sure, he tried to change back owner to the root:root , but root did not have any permissions anymore, since /bin is owned by another user.
Fortunately, this kind of mess on Linux systems we can fix very quickly using Live CD. So reboot your system and run Live CD. Continue reading Pro tip: How to repair an Ubuntu system with a Live CD
Today I got strange error on my production server when I tried to enable SSL on three domains. Since I use ISPConfig as hosting control panel I assumed it will work without problems. But I was wrong. I did little bit of research on this topic, and I found a simple solution.
If you look at /etc/apache2/ports.conf file, you will see:
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NameVirtualHost *:80 Listen 80 |
This way Apache knows which virtual host to serve based on the different host names. And it works fine for *:80 port. But, for 443 port it’s disabled, so you need to update ports.conf as follows to make it work:
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<IfModule mod_ssl.c> NameVirtualHost *:443 Listen 443 </IfModule> |
Make sure to restart Apache and it will work fine.
I hope this tip will save you some time.
More about Apache2 virtual hosts you can learn here. Other useful links I found while I was looking for solution:
Apache error: _default_ virtualhost overlap on port 443
Virtual hosts overlap on 443, first has precedence
VirtualHost Overlap on Port 443
