Apaches

Revision as of 03:07, 26 February 2009

Restarting

All

Connect to zwinger and type apache-gracefull-all . This will restart all apache processess for servers in the apaches dsh node group. You must be logged in as root to do this.

One, to test a change

Either connect to zwinger and ssh wherever or connect to the web server you want to test on. Then type apache-graceful to restart apache on that web server only. Test your change with telnet, as with this foundation example, with what you type in italics:

telnet localhost 80
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
GET /fundraising HTTP/1.1
Host:wikimediafoundation.org
(an empty line)

The raw HTML for the page will now be displayed in your window. You can copy and paste that into a file on your hard drive and open it with your browser to see the effect. Host is the name of the web site after the http:// part in your browser URL area. GET /fundraising is the part after the site name. The example gets http://wikimediafoundation.org/fundraising.

Logging

Text output on stderr from various external commands, as well as some apache errors, are in /apache/logs/error_log on each server. PHP errors are in /apache/logs/php-errors . Most apache error messages, such as file not found errors, are in hostname-error_log, for example /apache/logs/en.wikipedia.org-error_log .

Apache access logs are mostly disabled. Webalizer statistics are made using the squids logs instead.

Apache setup checklist

• Follow the Automated installation instructions for the base install
• Run the following on the server:

• apt-get update && apt-get dist-upgrade -y && apt-get install wikimedia-task-appserver && reboot && exit

• Wait for the server to come back online, ensure it starts apache correctly
  • echo 'GET /' | nc localhost 80 or any of the number of tests listed below
• If the server is part of the memcached group, follow instructions on Memcached
• Run the setup of Ganglia
• If the server is new, you will need to do the following:

• Login to the LVS server for apaches (lvs3 as of 2009-02-13) and add the new servers to /etc/pybal/apaches

• If the server is not new do the following:

• Ensure the server is now enabled in pybal on the LVS server in the file /etc/pybal/apaches

• You will need to add the server to DSH groups if new, or check if they are commented, if the server is not new:

• Add/Uncomment the host to /usr/local/dsh/node_groups/apaches and mediawiki-installation, as well as any other groups needed (apaches_pmtpa perhaps?)
• Reload nagios to accept the changes to the node groups:

• cd /home/wikipedia/conf/nagios && ./sync

• Verify that the server is tacking traffic and doing work

• ipvsadm -L | grep SERVERNAME
• traffic logs?

download.wikimedia.org etc

• currently on zwinger

Test cases

Here are some test cases you can use to test the apache configuration after changing something.

GET /wiki/Foo HTTP/1.1
Host: en.wikipedia.org
User-agent: testthing

GET /wiki/Foo HTTP/1.1
Host: www.wikipedia.org
User-agent: testthing

GET / HTTP/1.1
Host: en2.wikipedia.org
User-agent: testthing

GET /wiki/Main_Page HTTP/1.1
Host: www.wikipedia.com
User-agent: testthing

GET / HTTP/1.1
Host: wikipedia.com
User-agent: testthing

GET / HTTP/1.1
Host: wikibooks.org
User-agent: testthing

GET / HTTP/1.1
Host: wikiquote.org
User-agent: testthing

GET / HTTP/1.1
Host: dk.wikipedia.org
User-agent: testthing

GET / HTTP/1.1
Host: foo.wikipedia.org
User-agent: testthing

GET /wiki/Main_Page HTTP/1.1
Host: test.wikipedia.org
User-agent: testthing

GET / HTTP/1.1
Host: webshop.wikipedia.org
User-agent: testthing

GET / HTTP/1.1
Host: boards.wikimedia.org
User-agent: testthing

GET /wiki/Foo HTTP/1.1
Host: en.wikipedia.org
User-Agent: Exalead

GET /wiki/Foo HTTP/1.1
Host: meta.wikimedia.org
User-agent: testthing

GET / HTTP/1.1
Host: en.wiktionary.org
User-agent: testthing