linux performance

Checking varnish configuration syntax

If you’ve updated your varnish server’s configuration, there doesn’t seem to be an equivalent of ‘apachectl configtest’ for it, but you can do : varnishd -C -f /etc/varnish/default.vcl If everything is correct, varnish will then dump out the generated configuration. Otherwise you’ll get an error message pointing you to a specific line number.


Automated snapshot backup of an Amazon EBS volume

I found the following Python script online, but it didn’t really work too well : EBS – Elastic Block Storage … I had to easy_install boto, to get it to work. I’m not sure the Debian python-boto package in Lenny is up to date. Anyway, $server now has : from boto.ec2.connection import EC2Connection from […]


Varnish + Zope – Multiple zope instances behind a single varnish cache

I run multiple Zope instances on one server. Each Zope instance listens on a different port (localhost:100xx). Historically I’ve just used Apache as a front end which forwards requests to the Zope instance. Unfortunately there are periods of the year when one site gets a deluge of requests (for example; when hosting a school site, […]