gnt-filter - Ganeti job filter rule administration
gnt-filter {command} [options...] [arguments...]
The gnt-filter command is used for managing job filter rules in the Ganeti system. Filter rules are used by the Ganeti job scheduler to determine which jobs should be accepted, rejected, paused or rate-limited.
Filter rules consist of the following:
A UUID
, used to refer to existing filters.
A watermark
. This is the highest job id ever used, as valid in the moment when the filter was added or replaced.
A priority
. This is a non-negative integer. Filters are processed in order of increasing priority. While there is a well-defined order in which rules of the same priority are evaluated (increasing watermark, then the UUID, are taken as tie breakers), it is not recommended to have rules of the same priority that overlap and have different actions associated.
A list of predicates
to be matched against the job.
A predicate is a list, with the first element being the name of the predicate and the rest being parameters suitable for that predicate. Most predicates take a single parameter, which is a boolean expression formulated in the of the Ganeti query language. The currently supported predicate names are:
jobid
. Only parameter is a boolean expression. For this expression, there is only one field available, id
, which represents the id the job to be filtered. In all value positions, the string watermark
is replaced by the value of the watermark of the filter rule.
opcode
. Only parameter is a boolean expression. For this expression, OP_ID
and all other fields present in the opcode are available. This predicate will hold true, if the expression is true for at least one opcode in the job.
reason
. Only parameter is a boolean expression. For this expression, the three fields source
, reason
, timestamp
of reason trail entries are available. This predicate is true, if one of the entries of one of the opcodes in this job satisfies the expression.
user
. Only parameter is a boolean expression. For this expression, there is only one field available user
, which represents the authorized user submitted a job via RAPI. If a job is submitted by any other interface or an authentication is turned off in RAPI, it will contain an empty string.
An action
. One of:
n
, where n
is a positive integer. The job will be held in the queue while n
or more jobs where this rule applies are running. Jobs already running when this rule is added are not changed. Logically, this rule is applied job by job sequentially, so that the number of jobs where this rule applies is limited to n
once the jobs running at rule addition have finished.A reason trail, in the same format as reason trails for job opcodes (see the --reason
option in ganeti(7)). This allows to find out which maintenance (or other reason) caused the addition of this filter rule.
add
[--priority=PRIORITY]
[--predicates=PREDICATES]
[--action=ACTION]
Creates a new filter rule. A UUID is automatically assigned.
The --priority
option sets the priority of the filter. It is a non-negative integer. Default: 0 (the highest possible priority).
The --predicates
option sets the predicates of the filter. It is a list of predicates in the format described in the DESCRIPTION above. Default: [] (no predicate, filter always matches).
The --action
option sets the action of the filter. It is one of the strings ACCEPT
, PAUSE
, REJECT
, CONTINUE
, or RATE_LIMIT n
(see the DESCRIPTION above). Default: CONTINUE
.
See ganeti(7) for a description of --reason
and other common options.
replace
[--priority=PRIORITY]
[--predicates=PREDICATES]
[--action=ACTION]
[--reason=REASON]
{filter_uuid}
Replaces a filter rule, or creates one if it doesn't already exist.
Accepts all options described above in ADD
.
When being replaced, the filter will be assigned an updated watermark.
See ganeti(7) for a description of --reason
and other common options.
delete {filter_uuid}
Deletes the indicated filter rule.
list [--no-headers] [--separator=SEPARATOR] [-v]
[-o [+]FIELD,...] [filter_uuid...]
Lists all existing filters in the cluster. If no filter UUIDs are given, then all filters are included. Otherwise, only the given filters will be listed.
The --no-headers
option will skip the initial header line. The --separator
option takes an argument which denotes what will be used between the output fields. Both these options are to help scripting.
The -v
option activates verbose mode, which changes the display of special field states (see ganeti(7)).
The -o
option takes a comma-separated list of output fields. If the value of the option starts with the character +
, the new fields will be added to the default list. This allows to quickly see the default list plus a few other fields, instead of retyping the entire list of fields.
The available fields and their meaning are:
action
Action
predicates
Predicates
priority
Priority
reason_trail
Reason trail
uuid
Network UUID
watermark
Watermark
list-fields [field...]
List available fields for filters.
info [filter_uuid...]
Displays information about a given filter.
Draining the queue.
gnt-filter add '--predicates=[["jobid", [">", "id", "watermark"]]]' --action=REJECT
Soft draining could be achieved by replacing REJECT
by PAUSE
in the above example.
Pausing all new jobs not belonging to a specific maintenance.
gnt-filter add --priority=0 '--predicates=[["reason", ["=~", "reason", "maintenance pink bunny"]]]' --action=ACCEPT
gnt-filter add --priority=1 '--predicates=[["jobid", [">", "id", "watermark"]]]' --action=PAUSE
Cancelling all queued instance creations and disallowing new such jobs.
gnt-filter add '--predicates=[["opcode", ["=", "OP_ID", "OP_INSTANCE_CREATE"]]]' --action=REJECT
Limiting the number of simultaneous instance disk replacements to 10 in order to throttle replication traffic.
gnt-filter add '--predicates=[["opcode", ["=", "OP_ID", "OP_INSTANCE_REPLACE_DISKS"]]]' '--action=RATE_LIMIT 10'
Report bugs to project website or contact the developers using the Ganeti mailing list.
Ganeti overview and specifications: ganeti(7) (general overview), ganeti-os-interface(7) (guest OS definitions), ganeti-extstorage-interface(7) (external storage providers).
Ganeti commands: gnt-cluster(8) (cluster-wide commands), gnt-job(8) (job-related commands), gnt-node(8) (node-related commands), gnt-instance(8) (instance commands), gnt-os(8) (guest OS commands), gnt-storage(8) (storage commands), gnt-group(8) (node group commands), gnt-backup(8) (instance import/export commands), gnt-debug(8) (debug commands).
Ganeti daemons: ganeti-watcher(8) (automatic instance restarter), ganeti-cleaner(8) (job queue cleaner), ganeti-noded(8) (node daemon), ganeti-rapi(8) (remote API daemon).
Ganeti htools: htools(1) (generic binary), hbal(1) (cluster balancer), hspace(1) (capacity calculation), hail(1) (IAllocator plugin), hscan(1) (data gatherer from remote clusters), hinfo(1) (cluster information printer), mon-collector(7) (data collectors interface).
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