The hosting.config file (by default, located in /usr/local/etc/trafficserver/) you to assign cache volumes to specific origin servers and/or domains so that you can manage cache space efficiently and restrict disk usage. For step-by-step instructions on partitioning the cache according to origin servers and/or domains, refer to Partitioning the Cache.

Before you can assign cache volumes to specific origin servers and/or domains, you must first partition your cache according to size and protocol in the volume.config file.

After you modify hosting.config, navigate to the Traffic Server bin directory and run traffic_ctl config reload to apply your changes.

When you apply the changes to a node in a cluster, Traffic Server automatically applies the changes to all other nodes in the cluster.


The volume.config configuration must be the same on all nodes in a cluster.


Each line in the hosting.config file must have one of the following formats:

hostname=HOST volume=NUMBERS
domain=DOMAIN volume=NUMBERS

where HOST is the fully-qualified hostname of the origin server whose content you want to store on a particular volume (for example,; DOMAIN is the domain whose content you want to store on a particular partition(for example,; and NUMBERS is a comma-separated list of the partitions on which you want to store the content that belongs to the origin server or domain listed. The partition numbers must be valid numbers listed in the file:volume.config.

Note: To allocate more than one partition to an origin server or domain, you must enter the partitions in a comma-separated list on one line, as shown in the example below. The hosting.config file cannot contain multiple entries for the same origin server or domain.

Generic Partition

When configuring the hosting.config file, you must assign a generic volume to use for content that does not belong to any of the origin servers or domains listed. If all volumes for a particular origin server become corrupt, Traffic Server will also use the generic volume to store content for that origin server.

The generic volume must have the following format:

hostname=* volume=NUMBERS

where NUMBERS is a comma-separated list of generic volumes.


The following example configures Traffic Server to store content from the domain in volume 1 and content from in volume 2. Traffic Server stores content from all other origin servers in volumes 3 and 4. volume=1 volume=2
hostname=* volume=3,4