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Revision as of 02:16, 11 June 2013 by Thoth (Talk | contribs) (Multiple backends: updated for systemd)

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Varnish Cache is a web application accelerator also known as a caching HTTP reverse proxy. You install it in front of any server that speaks HTTP and configure it to cache the contents.

Multiple backends

By default, varnish comes configured in /usr/lib/systemd/system/varnish.service to use localhost:8080 as the only backend:

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Also, the VARNISH_CFG file is not loaded on varnish instalation nor service startup. So in case you want multiple backends from a VCL file, you need to edit /etc/varnish/default.vcl with at least one backend and call:

$ systemctl restart varnish.service

Manual VCL load

If the previous VCL configuration reload failed, try loading the VCL file manually:

  1. Connect to the varnish console:
    $ varnishadm -T localhost:6082
  2. Load the default VCL. Make sure it has at least one backend:
    varnish> vcl.load default /etc/varnish/default.vcl
  3. Make it active:
    varnish> vcl.use default
  4. Start the child proccess (optional):
    varnish> start