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I'm going to discuss a problem I've had recently and it has taken me longer than expected to know what was happening.

For a few days, randomly my server has been displaying the message:


SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock'

The Apache server was working normally, but Drupal could not access the database because the Mysql process had died.

I started looking at the trace of mysql to see may have happened. It did not show any error message.

When looking at the trace of S.O. (using dmesg) saw a memory overflow error. After doing a little research on Google, I found that Apache, when there are a greater number of connections, use all available memory on the server, causing the mysql closes before he could write anything in your log file.

The solution has been to adjust the apache settings to reduce the amount of memory consumed and leave enough room to other processes running (like MySQL).

There are many apps to learn languages ​​, but I found one that will serve us to learn to pronounce correctly: Pronunciation Dictionary.

If you are studying Spanish, for example, and don't know the difference between the pronunciation of 'vaca' and 'baca', just you open this app, search the words and hear how a native speaker pronounces them.

The good news are that we can hear the pronunciation all the time we need and if we want to hear a different person we can do it using advanced search.

I think it's a good tool to have in the mobile and can help anyone who wants to learn or improve a new language.

Amazon instances do not create a swap partition by default. If you want an easy solution to create it, we can do the following:


These instructions will create a 2Gb swap file. If you want to increase or reduce, just change the value of count=2048 in the first instruction

If we want to access external server via SSH, it is possible that if we are behind a proxy we will not have access to port 22 used by SSH. As root, edit the file sshd_config:


Edit the line which states 'Port 22' and changed it by 'Port 443'. This port is used by 'https' so it will not be closed in the proxy. Switch over to the new port by restarting SSH.