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Example VCL for Supercharging Content Delivery presentation
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# | |
# This is an example VCL file for Varnish. | |
# | |
# It does not do anything by default, delegating control to the | |
# builtin VCL. The builtin VCL is called when there is no explicit | |
# return statement. | |
# | |
# See the VCL chapters in the Users Guide at https://www.varnish-cache.org/docs/ | |
# and http://varnish-cache.org/trac/wiki/VCLExamples for more examples. | |
# Marker to tell the VCL compiler that this VCL has been adapted to the | |
# new 4.0 format. | |
vcl 4.0; | |
import directors; | |
# Health check | |
probe health_check { | |
.url = "/"; | |
.timeout = 1s; | |
.interval = 5s; | |
} | |
acl purge { | |
"127.0.0.1"; | |
"45.55.163.206"; | |
} | |
# Default backend definition. Set this to point to your content server. | |
backend server1 { | |
.host = "45.55.140.8"; | |
.probe = health_check; | |
} | |
backend server2 { | |
.host = "45.55.163.196"; | |
.probe = health_check; | |
} | |
backend server3 { | |
.host = "45.55.163.193"; | |
.probe = health_check; | |
} | |
sub vcl_init { | |
new vdir = directors.round_robin(); | |
vdir.add_backend(server1); | |
vdir.add_backend(server2); | |
vdir.add_backend(server3); | |
} | |
sub vcl_recv { | |
# Happens before we check if we have this in cache already. | |
# | |
# Typically you clean up the request here, removing cookies you don't need, | |
# rewriting the request, etc. | |
if (req.method == "PURGE") { | |
if (!client.ip ~ purge) { | |
return(synth(403,"Forbidden")); | |
} | |
return(purge); | |
} | |
set req.backend_hint = vdir.backend(); | |
if (req.url ~ "wp-admin|wp-login") { | |
return (pass); | |
} | |
unset req.http.cookie; | |
} | |
sub vcl_backend_response { | |
# Happens after we have read the response headers from the backend. | |
# | |
# Here you clean the response headers, removing silly Set-Cookie headers | |
# and other mistakes your backend does. | |
if (bereq.url ~ ".png$|.gif$|.jpg$") { | |
set beresp.ttl = 8h; | |
} | |
if (!beresp.http.Cache-Control) { | |
set beresp.ttl = 5m; | |
} | |
if (beresp.status == 200 && beresp.http.content-length == "0") { | |
return(retry); | |
} | |
set beresp.grace = 1h; | |
} | |
sub vcl_deliver { | |
# Happens when we have all the pieces we need, and are about to send the | |
# response to the client. | |
# | |
# You can do accounting or modifying the final object here. | |
if (obj.hits > 0) { | |
set resp.http.X-Cache = "HIT"; | |
} else { | |
set resp.http.X-Cache = "MISS"; | |
} | |
} |
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