NAME

       parent.config - Traffic Server parent cache configuration file

       The  parent.config file identifies the parent proxies used in an cache hierarchy. Use this
       file to perform the following configuration:

       • Set up parent cache hierarchies, with multiple parents and parent failover

       • Configure selected URL requests to bypass parent proxies

       Traffic Server uses the parent.config file only when the parent caching option is  enabled
       (refer to configuring-traffic-server-to-use-a-parent-cache).

       After  you  modify  the  parent.config file, run the traffic_line -x command to apply your
       changes. When you apply the changes to one node in a cluster, Traffic Server automatically
       applies the changes to all other nodes in the cluster.

FORMAT

       Each  line  in  the  parent.config file must contain a parent caching rule. Traffic Server
       recognizes three space-delimited tags:

          primary_destination=value secondary_specifier=value  action=value

       The following list shows the possible primary destinations and their allowed values.

       dest_domain
              A requested domain name.

       dest_host
              A requested hostname.

       dest_ip
              A requested IP address or range of IP addresses separated by a dash (-).

       url_regex
              A regular expression (regex) to be found in a URL

       The secondary specifiers are optional in the parent.config file. The following list  shows
       the possible secondary specifiers and their allowed values.

       port   A requested URL port.

       scheme A request URL protocol: http or https.

       prefix A prefix in the path part of a URL.

       suffix A file suffix in the URL.

       method A request URL method. It can be one of the following:

              • get

              • post

              • put

              • trace

       time   A  time  range, such as 08:00-14:00, during which the parent cache is used to serve
              requests.

       src_ip A client IP address.

       The following list shows the possible actions and their allowed values.

       parent An ordered list of parent servers. If the request cannot be  handled  by  the  last
              parent  server  in  the  list, then it will be routed to the origin server. You can
              specify either a hostname or an IP address, but; you must specify the port number.

       round_robin
              One of the following values:

              • true - Traffic Server goes through the parent cache list in a  round  robin-based
                on client IP address.

              • strict  -  Traffic  Server machines serve requests strictly in turn. For example:
                machine proxy1 serves the first request, proxy2 serves the second request, and so
                on.

              • false - Round robin selection does not occur.

              • consistent_hash - consistent hash.

       go_direct
              One of the following values:

              • true - requests bypass parent hierarchies and go directly to the origin server.

              • false - requests do not bypass parent hierarchies.

EXAMPLES

       The following rule configures a parent cache hierarchy consisting of Traffic Server (which
       is the child) and two parents, p1.x.com and p2.x.com. Traffic Server forwards the requests
       it cannot serve to the parent servers p1.x.com and p2.x.com in a round-robin fashion:

          round_robin=true
          dest_domain=. method=get parent="p1.x.com:8080; p2.y.com:8080" round_robin=true
          round_robin=consistent_hash
          dest_domain=. method=get parent="p1.x.com:8080|1.0; p2.y.com:8080|2.0" round_robin=consistent_hash

       The  following rule configures Traffic Server to route all requests containing the regular
       expression politics and the path /viewpoint directly to the origin server  (bypassing  any
       parent hierarchies): url_regex=politics prefix=/viewpoint go_direct=true

       Every  line  in  the  parent.config  file  must  contain  either  a  parent= or go_direct=
       directive.

COPYRIGHT

       2014, dev@trafficserver.apache.org