Difference between revisions of "Varnish"

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m (Multiple backends: updated for systemd)
m (Multiple backends: added nowiks)
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By default, varnish comes configured in {{ic|/usr/lib/systemd/system/varnish.service}} to use '''localhost:8080''' as the only backend:
 
By default, varnish comes configured in {{ic|/usr/lib/systemd/system/varnish.service}} to use '''localhost:8080''' as the only backend:
  
{{hc|/usr/lib/systemd/system/varnish.service|
+
{{hc| /usr/lib/systemd/system/varnish.service |
[Unit]
+
<nowiki>[Unit]
 
Description=Web Application Accelerator
 
Description=Web Application Accelerator
 
After=network.target
 
After=network.target
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[Install]
 
[Install]
WantedBy=multi-user.target}}
+
WantedBy=multi-user.target</nowiki>}}
  
  

Revision as of 02:17, 11 June 2013

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:

 /usr/lib/systemd/system/varnish.service 
[Unit]
Description=Web Application Accelerator
After=network.target

[Service]
ExecStart=/usr/bin/varnishd -a 0.0.0.0:80 -f /etc/varnish/default.vcl -T localhost:6082 -s malloc,64M -u nobody -g nobody -F
ExecReload=/usr/bin/varnish-vcl-reload

[Install]
WantedBy=multi-user.target


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