dcc89e3ad6
Adds a -p option to swift-dispersion-report that will output the partitions missing copies to standard error. Another thing we've been meaning to add for forever. It's useful when you want to do some further research on whether a partition truly has fewer copies or if they're just somewhere else in the cluster due to a ring change, for instance. DocImpact Change-Id: I5e47aa5818483ecc34b39ef6f8cd83ad312ed9a0
119 lines
3.6 KiB
Groff
119 lines
3.6 KiB
Groff
.\"
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.\" Author: Joao Marcelo Martins <marcelo.martins@rackspace.com> or <btorch@gmail.com>
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.\" Copyright (c) 2010-2011 OpenStack, LLC.
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.\"
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.\" Licensed under the Apache License, Version 2.0 (the "License");
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.\" you may not use this file except in compliance with the License.
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.\" You may obtain a copy of the License at
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.\"
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.\" http://www.apache.org/licenses/LICENSE-2.0
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.\"
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.\" Unless required by applicable law or agreed to in writing, software
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.\" distributed under the License is distributed on an "AS IS" BASIS,
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.\" WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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.\" implied.
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.\" See the License for the specific language governing permissions and
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.\" limitations under the License.
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.\"
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.TH swift-dispersion-report 1 "8/26/2011" "Linux" "OpenStack Swift"
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.SH NAME
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.LP
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.B swift-dispersion-report
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\- Openstack-swift dispersion report
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.SH SYNOPSIS
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.LP
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.B swift-dispersion-report [-d|--debug] [-j|--dump-json] [-p|--partitions] [conf_file]
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.SH DESCRIPTION
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.PP
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This is one of the swift-dispersion utilities that is used to evaluate the
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overall cluster health. This is accomplished by checking if a set of
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deliberately distributed containers and objects are currently in their
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proper places within the cluster.
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.PP
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For instance, a common deployment has three replicas of each object.
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The health of that object can be measured by checking if each replica
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is in its proper place. If only 2 of the 3 is in place the object's health
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can be said to be at 66.66%, where 100% would be perfect.
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.PP
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Once the \fBswift-dispersion-populate\fR has been used to populate the
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dispersion account, one should run the \fBswift-dispersion-report\fR tool
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repeatedly for the life of the cluster, in order to check the health of each
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of these containers and objects.
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.PP
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These tools need direct access to the entire cluster and to the ring files.
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Installing them on a proxy server will probably do or a box used for swift
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administration purposes that also contains the common swift packages and ring.
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Both \fBswift-dispersion-populate\fR and \fBswift-dispersion-report\fR use the
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same configuration file, /etc/swift/dispersion.conf . The account used by these
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tool should be a dedicated account for the dispersion stats and also have admin
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privileges.
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.SH OPTIONS
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.RS 0
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.PD 1
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.IP "\fB-d, --debug\fR"
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output any 404 responses to standard error
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.SH OPTIONS
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.RS 0
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.PD 1
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.IP "\fB-j, --dump-json\fR"
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output dispersion report in json format
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.SH OPTIONS
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.RS 0
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.PD 1
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.IP "\fB-p, --partitions\fR"
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output the partition numbers that have any missing replicas
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.SH CONFIGURATION
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.PD 0
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Example \fI/etc/swift/dispersion.conf\fR:
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.RS 3
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.IP "[dispersion]"
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.IP "auth_url = https://127.0.0.1:443/auth/v1.0"
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.IP "auth_user = dpstats:dpstats"
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.IP "auth_key = dpstats"
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.IP "swift_dir = /etc/swift"
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.IP "# dispersion_coverage = 1"
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.IP "# retries = 5"
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.IP "# concurrency = 25"
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.IP "# dump_json = no"
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.RE
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.PD
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.SH EXAMPLE
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.PP
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.PD 0
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$ swift-dispersion-report
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.RS 1
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.IP "Queried 2622 containers for dispersion reporting, 31s, 0 retries"
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.IP "100.00% of container copies found (7866 of 7866)"
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.IP "Sample represents 1.00% of the container partition space"
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.IP "Queried 2621 objects for dispersion reporting, 22s, 0 retries"
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.IP "100.00% of object copies found (7863 of 7863)"
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.IP "Sample represents 1.00% of the object partition space"
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.RE
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.PD
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.SH DOCUMENTATION
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.LP
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More in depth documentation about the swift-dispersion utilities and
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also Openstack-Swift as a whole can be found at
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.BI http://swift.openstack.org/admin_guide.html#cluster-health
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and
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.BI http://swift.openstack.org
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.SH "SEE ALSO"
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.BR swift-dispersion-populate(1),
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.BR dispersion.conf (5)
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