How To Redirect www To non-www And Vice Versa with Nginx

In this short tutorial I’ll show you how to make permanent redirect from a www URL to non-www and vice versa. I’ll assume that you have superuser privileges, sudo  or root access and Nginx already configured, as well as DNS records. More specifically, you need to have an A records for www.yourdomain.com  and yourdomain.com .

Redirect non-www to www

To redirect users from a plain, non-www domain to a www domain, you need to add this snippet in your Nginx domain configuration file:

Save your configuration and exit. Before restarting Nginx make sure to test your configuration:

Continue reading How To Redirect www To non-www And Vice Versa with Nginx

Installing Icinga2 (fork of Nagios) on Debian 7 (Wheezy)

Preface

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)

SSH Authentication With Keys Instead Passwords

SSH is a must have tool for every System administrator or DevOps Engineer. It provides you a secure way to access remote servers. But, if you use standard password authentication there is always a chance that someone will break into system due to weak password.  This potential risk increases if multiple users have SSH access to the server, because system administrator can’t influence to the users to make a better passwords.

Continue reading SSH Authentication With Keys Instead Passwords

Apache2 – mod_fcgid: HTTP request length exceeds MaxRequestLen

Few days ago I found a very good Open Source project for sharing and synchronization (Dropbox alternative) called Pydio. Heard before for this project, but I have never tried to install it before. I tried the demo and decided to install Pydio on my own server and check this little bit more. Installation procedure went smoothly and in 5 minutes I had my sharing web site ready to use.

But, when I tried to upload multiple files, all of them larger than 3Mb, browser simply returned:

Then I checked Apache2 log, and here is what I found:

It seams that MaxRequestLen directive of mod_fccgid is too low. To fix this, you need to update few options in your php.ini file. Search for upload_max_filesize which puts limit on any single file, default value should be set to this:

change this value to whatever you want, but I strongly suggest you to set >50M. Then search for post_max_size, default value is:

this is the size of the entire body of the request, which could include multiple files. Set this value at lest 2-3x as upload_max_filesize. Continue reading Apache2 – mod_fcgid: HTTP request length exceeds MaxRequestLen

Virtual hosts overlap on 443, the first has precedence

Apache2 LogoToday 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:

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:

Make sure to restart Apache and it will work fine.

I hope this tip will save you some time.

Resources

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