Power up Drupal search with Jetty & Apache Solr in Ubuntu 10.04

If you are running a big site with loads of visitors or just running a normal site with very minimal resources your basic Drupal search functionality might slow down your site significantly. And it's not even very efficient solution to search all the contents of your site. Don't worry, the help is here. Apache Solr helps you with your site's search functionality and makes it blazingly fast! In this first part of Apache Solr walk through we are going to install and configure Apache Solr + Jetty with Drupal.

GPG error: http://archive.ubuntu.com lucid Release: The following signatures were invalid

If running 'apt-get update' you get the error:

Reading package lists... Done
W: GPG error: http://archive.ubuntu.com lucid Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key

then

cd /var/lib/apt
mv lists lists.old
mkdir -p lists/partial
apt-get clean
apt-get update

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How to remove/turn off/disable Linux KVM virbr0 NAT Interface

A virtual bridge, can be defined as a device that bridges virtual interfaces. It provides an easy means of networking virtual networking devices such as venet (virtual network) or veth (virtual ethernet).

How to optimize Apache for performance memory usage

1. SSH into your server as root.
2. Run top.
3. Press shift + m.
4. Note the highest RES memory used by httpd.
5. Hit Q to exit top.
6. Execute: service httpd stop
7. Once httpd is stopped, execute: free -m
8. Note the memory listed under "used".
9. Find the guaranteed memory for your VPS plan. Support can tell you how much you have guaranteed if you cannot find it.
10. Subtract the memory USED from the memory that your plan is GUARANTEED. This will give you your base FREE MEMORY POOL.

Best APC settings for a Drupal site to reduce page execution time

This is one of those "how long is a piece of string questions".

What is good for a high-volume site may not be the same for a low-volume site with a lot of modules, and may not be the same for a medium-volume site with only a few modules enabled. Other sites running on the server may also be eating into the memory that APC has available.

My starting point is

apc.enabled=1
apc.shm_segments=1
apc.shm_size=64
apc.ttl=7200
apc.user_ttl=7200
apc.num_files_hint=1024
apc.mmap_file_mask=/tmp/apc.XXXXXX
apc.enable_cli=1
apc.rfc1867=1

Enable log files

MySQL provides many different log files to capture various information that you can use for performance tuning or during problem determination.

To enable the log files, do the following:
Create the /etc/my.cnf options file with the following definitions that enable the log files automatically:

[mysqld]
log-bin
log
log-error
log-slow-queries

By default, the logs are placed in the data directory /pathname/mysql/data. The log names default to the name of the host system followed by a log identifier such as -bin.

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How and where to set administrator's e-mail in Apache

If your system was not configured with administrator e-mail then on 500 Internal Server Error you will see the following message:

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, [no address given] and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

To set admin's e-mail open:

How to install memcached on Ubuntu for use with Drupal

This guide is based on various community forum posts. Special thanks to Jonathan Wagener for the Ubuntu specific instructions

Monit configuration to monitor Memcached instances

Monit is a free open source utility for managing and monitoring, processes, files, directories and filesystems on a UNIX system. It is pretty easy to configure and even easier to use. It comes with a simple web server to monitor statuses of the alerts you set (with basic HTTP authentication). On Monit W’k’ you can find configuration examples for different services. Just in case you need a configuration example for Memcached instances, here is what you need.

How to properly install drush on Ubuntu 10.04

Despite it is clearly noted on http://drupal.org/node/1248790 the recommended way is to download Drush from the project page and to install it manually by reading the instructions of the README.txt file, many people start executing the aptitude command given on the same page:

$ sudo apt-get install drush

and the subsequent commands like

$ drush --version
$ drush dl drush

give you no joy since the official Ubuntu repositories contain very much outdated version of drush, which can not neither update itself nor display its version.

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