swift-dispersion-report (1)

swift-dispersion-report [-d|--debug] [-j|--dump-json] [-p|--partitions] [--container-only|--object-only] [--insecure] [conf_file]

This is one of the swift-dispersion utilities that is used to evaluate the overall cluster health. This is accomplished by checking if a set of deliberately distributed containers and objects are currently in their proper places within the cluster.

For instance, a common deployment has three replicas of each object. The health of that object can be measured by checking if each replica is in its proper place. If only 2 of the 3 is in place the object's health can be said to be at 66.66%, where 100% would be perfect.

Once the swift-dispersion-populate has been used to populate the dispersion account, one should run the swift-dispersion-report tool repeatedly for the life of the cluster, in order to check the health of each of these containers and objects.

These tools need direct access to the entire cluster and to the ring files. Installing them on a proxy server will probably do or a box used for swift administration purposes that also contains the common swift packages and ring. Both swift-dispersion-populate and swift-dispersion-report use the same configuration file, /etc/swift/dispersion.conf . The account used by these tool should be a dedicated account for the dispersion stats and also have admin privileges.

-d, --debug

output any 404 responses to standard error

-j, --dump-json

output dispersion report in json format

-p, --partitions

output the partition numbers that have any missing replicas

--container-only

Only run the container report

--object-only

Only run the object report

--insecure

Allow accessing insecure keystone server. The keystone's certificate will not be verified.

Example /etc/swift/dispersion.conf:

[dispersion]

auth_url = https://127.0.0.1:443/auth/v1.0

auth_user = dpstats:dpstats

auth_key = dpstats

swift_dir = /etc/swift

# dispersion_coverage = 1.0

# retries = 5

# concurrency = 25

# dump_json = no

# endpoint_type = publicURL

$ swift-dispersion-report

Queried 2622 containers for dispersion reporting, 31s, 0 retries

100.00% of container copies found (7866 of 7866)

Sample represents 1.00% of the container partition space

Queried 2621 objects for dispersion reporting, 22s, 0 retries

100.00% of object copies found (7863 of 7863)

Sample represents 1.00% of the object partition space

More in depth documentation about the swift-dispersion utilities and also Openstack-Swift as a whole can be found at http://swift.openstack.org/admin_guide.html#cluster-health and http://swift.openstack.org

swift-dispersion-populate(1), dispersion.conf(5)