traffic_cache_tool¶

Synopsis¶

traffic_cache_tool [OPTIONS] COMMAND [SUBCOMMAND …] [OPTIONS]

Description¶

traffic_cache_tool is designed to interact with the Traffic Server cache both for inspection and modification. It uses a nested command keyword style for specifying operations. There are some global options that apply to all commands. These should be specified before any command. These can be abbreviated to any unique initial substring (e.g. “–sp” for “–span”).

--help

Prints a brief usage message along with the current command hierarchy.

--spans

Specify the span (storage) configuration. This can be a device, a cache directory, or a configuration file in the formof storage.config. In the latter case all devices listed in the configuration file become active.

--volumes

Specify the volume configuration file in the format of volume.config. This is important primarily for allocation operations where having the volume configuration is needed in order to properly allocate storage in spans to specific volumes.

--write

Enable writing to storage devices. If this flag is not present then all storage will be opened read only and no operation will write to any storage device. This makes “dry run” the default and actual changes require specifying this flag.

--aos

Specific the average object size in bytes. This is used in various computations. It is identical to proxy.config.cache.min_average_object_size.

--input

Specify the input file or disk.

Commands¶

list

Search the spans for stripe data and display it. This is potentially slow as large sections of the disk may need to be read to find the stripe headers.

stripes
clear

Clear all the spans by writing updated span headers.

span
Clears an specific span and it’s stripes. The span to be cleared is specified via --device
dir_check

Perform diagnostics on the stripe directories.

full
Full check of the directories.
freelist
Validate the directory free lists.
bucket_chain
Validate the bucket chains in the directories.
volumes
Compute storage allocation to stripes based on the volume configuration and print it.
alloc

Allocate storage to stripes, updating the span and stripe headers.

free
Allocate only free (unused) storage to volumes, updating span and stripe headers as needed.
init
Initializes an uninitialized span and creates stripes on that span according to the volume and storage configuration The span to be initialized can be passed via --input
find
Determines the stripe in disk cache where the content corresponding to the provided URL may be cached. This command takes an input file which lists all the urls for which the stripe assignment needs to be determined.

Examples¶

List the basic span data.:

traffic_cache_tool --spans=/usr/local/etc/trafficserver/storage.config list


Allocate unused storage space.:

traffic_cache_tool \
--spans=/usr/local/etc/trafficserver/storage.config \
--volumes=/usr/local/etc/trafficserver/volume.config \
alloc free


Clear all spans.:

traffic_cache_tool \
--spans=/usr/local/etc/trafficserver/storage.config \
--volumes=/usr/local/etc/trafficserver/volume.config \
clear


Clear a single span.:

traffic_cache_tool \
--span /opt/etc/trafficserver/storage.config \
--volume /opt/etc/trafficserver/volume.config \
clear span --device "/dev/sdb3" --write


Initialize a new span.:

traffic_cache_tool \
--span /opt/etc/trafficserver/storage.config \
--volume /opt/etc/trafficserver/volume.config \
init --input "/dev/sdb3" --write


Find Stripe Assignment.:

traffic_cache_tool \
--span /opt/etc/trafficserver/storage.config \
--volume /opt/etc/trafficserver/volume.config \
init --input "/home/user/urls.txt"