Liz Quilty – Security, Scaling & High End Hosting for WordPress sites from WordCampNZ 2012 devs April 22

1. Scaling & High End
Hosting for
WordPress
By Liz Quilty

2. There is no single solution

3. Work out what You Want and
Need!

4. Security
Lots of articles exist already, read them!
Plug-ins
• WP-Sentinel
• WordPress Sentinel (they are different!)
Permissions
Version Control - CVS, SVN, Git
Backups!

5. Version Control System
Set Apache to ignore .svn .git .cvs, etc
Ignore files
•
•
wp-config.php
•
wp-content/uploads/
wp-local-config.php
capistrano for deploy
Develop/test on local or Dev machine

6. Scaling Single server
• NGINX + phpFCGI ?
• Varnish + apache + mod_php
• PHP-APC
• WP-Supercache/W3-total-cache
• Batcache / Memcached
• Enable the WordPress Object Cache
define(ENABLE_CACHE, true);
Watch for PHP-CGI/FCGI memory usage!

7. Take Media Offsite
Videos - Youtube,Vimo
Files - CDN, Flickr, DropBox, S3
Comments - IntenseDebate, Discus
These help save disk & IO, resources

8. The Cloud?
Cost
Space
Redundancy
Control - or lack of it
Openstack
Cloudmin
Control Panels? What Control Panels!

9. Scaling Multiple
Same as Single .. plus more
DNS Round Robin ?
Heartbeat IP Failover ?
Separate DB server w/ Replication ?
File replication ?
Controlling multiple servers ?
Multiple Layouts - Planning is key!

12. DB Replication
Database:
• Mysql Master/Master replication
• Mysql Master/Slave
• Separate DB server(s)
• HyperDB Plugin

13. Replication of Files
• Unisen
• rsync
• bitpocket
• DRBD
• Rsync
• Gluster

14. Controlling servers
CFEngine
Puppet
ClusterSSH
#!/bin/bash
HOSTS="machine1 machine2 machine3 machine4";
if [ $1 ];then
for i in $HOSTS; do ssh $i "$@"; done
fi

15. Have a Plan, test it
10 Plan
20 Test
30 Adapt
40 Goto 20
Implement
Don't wait until you have a problem to test it!
Monitoring - NewRelic, Nagios, etc
Failover Plans, like Heartbeat, DNS, etc

16. Things to remember
Backup! Backup! Backup!
Multiple Sites for redundancy
Documentation in case developer/admin
disappears

17. Questions?
Questions?

18. http://www.freesoftwaremagazine.com/articles/easy_file_sync_bitpocket