Varnish VCL Wordpress - 1. sudo cp /etc/varnish/default.vcl /etc/varnish/default.vcl.bak 2. sudo vi /etc/varnish/default.vcl

default.vcl

/* SET THE HOST AND PORT OF WORDPRESS

* *********************************************************/

backend default {

  .host = "127.0.0.1";

  .port = "8080";

}

# SET THE ALLOWED IP OF PURGE REQUESTS

# ##########################################################

acl purge {

  "localhost";

  "162.243.20.190";

}

# THE RECV FUNCTION

# ##########################################################

sub vcl_recv {

  # For Testing: If you want to test with Varnish passing (not caching) uncomment

  # return( pass );

  # FORWARD THE IP OF THE REQUEST

  if (req.restarts == 0) {

    if (req.http.x-forwarded-for) {

      set req.http.X-Forwarded-For =

      req.http.X-Forwarded-For + ", " + client.ip;

    } else {

      set req.http.X-Forwarded-For = client.ip;

    }

  }

  # CLEAN UP THE ENCODING HEADER.

  # SET TO GZIP, DEFLATE, OR REMOVE ENTIRELY.  WITH VARY ACCEPT-ENCODING

  # VARNISH WILL CREATE SEPARATE CACHES FOR EACH

  # DO NOT ACCEPT-ENCODING IMAGES, ZIPPED FILES, AUDIO, ETC.

  # ##########################################################

  if (req.http.Accept-Encoding) {

    if (req.url ~ "\.(jpg|png|gif|gz|tgz|bz2|tbz|mp3|ogg)$") {

      # No point in compressing these

      remove req.http.Accept-Encoding;

    } elsif (req.http.Accept-Encoding ~ "gzip") {

      set req.http.Accept-Encoding = "gzip";

    } elsif (req.http.Accept-Encoding ~ "deflate") {

      set req.http.Accept-Encoding = "deflate";

    } else {

      # unknown algorithm

      remove req.http.Accept-Encoding;

    }

  }

  # IF THIS IS A PURGE REQUEST, THEN CHECK THE IPS SET ABOVE

  # BLOCK IF NOT ONE OF THOSE IPS

  # ##########################################################

  if (req.request == "PURGE") {

    if ( !client.ip ~ purge ) {

      error 405 "Not allowed.";

    }

    return (lookup);

  }

  # PIPE ALL NON-STANDARD REQUESTS

  # ##########################################################

  if (req.request != "GET" &&

    req.request != "HEAD" &&

    req.request != "PUT" &&

    req.request != "POST" &&

    req.request != "TRACE" &&

    req.request != "OPTIONS" &&

    req.request != "DELETE") {

      return (pipe);

  }

  # ONLY CACHE GET AND HEAD REQUESTS

  # ##########################################################

  if (req.request != "GET" && req.request != "HEAD") {

    return (pass);

  }

  # OPTIONAL: DO NOT CACHE LOGGED IN USERS (THIS OCCURS IN FETCH TO, EITHER

  # COMMENT OR UNCOMMENT BOTH

  # ##########################################################

  if ( req.http.cookie ~ "wordpress_logged_in" ) {

    return( pass );

  }

  # IF THE REQUEST IS NOT FOR A PREVIEW, WP-ADMIN OR WP-LOGIN

  # THEN UNSET THE COOKIES

  # ##########################################################

  if (

    !(req.url ~ "wp-(login|admin)")

    && !(req.url ~ "&preview=true" )

  ){

    unset req.http.cookie;

  }

  # IF BASIC AUTH IS ON THEN DO NOT CACHE

  # ##########################################################

  if (req.http.Authorization || req.http.Cookie) {

    return (pass);

  }

  # LIST URLS NOT TO BE CACHED

  # USUALLY THIS INCLUDES THE PREVIEW QUERY STRING, A NOCACHE

  # QUERY STRING, AND FILES THAT WILL BE SERVED BY THE CDN

  # SUCH AS IMAGES, CSS, AND JS.  IF YOU ARE NOT USING A CDN

  # YOU CAN CACHE YOUR STATIC RESOURCES TOO

  # ##########################################################

  if (

    req.url ~ "preview"

    || req.url ~ "nocache"

    || req.url ~ "\.css$"

    || req.url ~ "\.js$"

    || req.url ~ "\.jpg$"

    || req.url ~ "\.jpeg$"

    || req.url ~ "\.gif$"

    || req.url ~ "\.png$"

  ) {

    return (pass);

  }

  # IF YOU GET HERE THEN THIS REQUEST SHOULD BE CACHED

  # ##########################################################

  return (lookup);

}

# HIT FUNCTION

# ##########################################################

sub vcl_hit {

  # IF THIS IS A PURGE REQUEST THEN DO THE PURGE

  # ##########################################################

  if (req.request == "PURGE") {

    purge;

    error 200 "Purged.";

  }

  return (deliver);

}

# MISS FUNCTION

# ##########################################################

sub vcl_miss {

  if (req.request == "PURGE") {

    purge;

    error 200 "Purged.";

  }

  return (fetch);

}

# FETCH FUNCTION

# ##########################################################

sub vcl_fetch {

  # I SET THE VARY TO ACCEPT-ENCODING, THIS OVERRIDES W3TC

  # TENDANCY TO SET VARY USER-AGENT.  YOU MAY OR MAY NOT WANT

  # TO DO THIS

  # ##########################################################

  set beresp.http.Vary = "Accept-Encoding";

  # IF NOT WP-ADMIN THEN UNSET COOKIES AND SET THE AMOUNT OF

  # TIME THIS PAGE WILL STAY CACHED (TTL)

  # ##########################################################

  if (!(req.url ~ "wp-(login|admin)") && !req.http.cookie ~ "wordpress_logged_in" ) {

    unset beresp.http.set-cookie;

    set beresp.ttl = 96h;

  }

  if (beresp.ttl <= 0s ||

    beresp.http.Set-Cookie ||

    beresp.http.Vary == "*") {

      set beresp.ttl = 120 s;

      return (hit_for_pass);

  }

  return (deliver);

}

# DELIVER FUNCTION

# ##########################################################

sub vcl_deliver {

  # IF THIS PAGE IS ALREADY CACHED THEN RETURN A 'HIT' TEXT

  # IN THE HEADER (GREAT FOR DEBUGGING)

  # ##########################################################

  if (obj.hits > 0) {

    set resp.http.X-Cache = "HIT";

  # IF THIS IS A MISS RETURN THAT IN THE HEADER

  # ##########################################################

  } else {

    set resp.http.X-Cache = "MISS";

  }

}