Varnish Cache
Varnish is a web accelerator written with performance and
flexibility in mind. It's modern architecture gives it a significantly
better performance. Varnish stores
web pages in memory so the web servers do not have to create the same
web page repeatedly. The web server only recreates a page when
it is changed. When content is served from memory this
happens a lot faster then anything.
Additionally Varnish can serve web pages much faster then any
application server is capable of - giving the website a significant
speed enhancement.
It uses the advanced features in Linux 2.6, FreeBSD 6/7 and
Solaris 10 to achieve its high performance. For a cost-effective
configuration, Varnish Cache uses between 1-16GB and a SSD disk.
Features include:
- Modern design
- VCL - a very flexible configuration language. The
VCL configuration is translated to C, compiled, loaded and executed
giving flexibility and speed
- Load balancing using both a round-robin and a random
director, both with a per-backend weighting
- Load balance between multiple backends
- Partial support for ESI
- Heavily threaded
- URL rewriting
- Cache multiple vhosts with a single Varnish
- Log data is stored in shared memory
- Basic health-checking of backends
- Graceful handling of "dead" backends
- Administered by a command line interface
- Use In-line C to extend Varnish
- Can be used on the same system as Apache
- Run multiple Varnish on the same system
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Last Updated Saturday, May 12 2012 @ 11:43 AM EDT
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