check_pgactivity

check_pgactivity - PostgreSQL plugin for Nagios

SYNOPSIS

check_pgactivity {-w|--warning THRESHOLD} {-c|--critical THRESHOLD} [-s|--service SERVICE ] [-h|--host HOST] [-U|--username ROLE] [-p|--port PORT] [-d|--dbname DATABASE] [-S|--dbservice SERVICE_NAME] [-P|--psql PATH] [--debug] [--status-file FILE] [--path PATH] [-t|--timemout TIMEOUT]
check_pgactivity [--list]
check_pgactivity [--help]

DESCRIPTION

check_pgactivity is designed to monitor PostgreSQL clusters from Nagios. It offers many options to measure and monitor useful performance metrics.

-s, --service SERVICE

The nagios service to run. See section SERVICES for a description of available services or use --list for a short service and description list.

-h, --host HOST

Database server host or socket directory (default: "localhost").

-U, --username ROLE

Database user name (default: "postgres").

-p, --port PORT

Database server port (default: "5432").

-d, --dbname DATABASE

Database name to connect to (default: "postgres").

WARNING! This is not necessarily one of the database that will be checked. See --dbinclude and --dbexclude .

-S, --dbservice SERVICE_NAME

The connection service name from pg_service.conf to use.

--dbexclude REGEXP

Some services are automatically checking all the databases of your cluster (note: that does not mean they always need to connect on all of them to check them though). --dbexclude allows to exclude any database whose name matches the given perl regular expression. You can repeat this option as many time as needed.

See --dbinclude as well. If a database match both dbexclude and dbinclude arguments, it is excluded.

--dbinclude REGEXP

Some services are automatically checking all the databases of your cluster(note: that does not mean they always need to connect on all of them to check them though). --dbinclude allows to ONLY check databases whose names match the given perl regular expression. You can repeat this option as many time as needed.

See --dbexclude as well. If a database match both dbexclude and dbinclude arguments, it is excluded.

-w, --warning THRESHOLD

The Warning threshold.

-c, --critical THRESHOLD

The Critical threshold.

--tmpdir DIRECTORY

Path to a directory where the script can create temporary files. The script relies on the system default temporary directory if possible.

-P, --psql FILE

Path to the psql executable (default: "psql").

--status-file PATH

PATH to the file where service status information will be kept between successive calls. Default is to save check_pgactivity.data in the same directory as the script.

-t, --timeout TIMEOUT

Timeout to use (default: "30s"). It can be specified as raw (in seconds) or as an interval. This timeout will be used as statement_timeout for psql and URL timeout for minor_version service.

--list

List available services.

-V, --version

Print version and exit.

--debug

Print some debug messages.

-?, --help

Show this help page.

THRESHOLDS

THRESHOLDS provided as warning and critical values can be a raw numbers, percentages, intervals or a sizes. Each available service supports one or more formats (eg. a size and a percentage).

Percentage

If threshold is a percentage, the value should end with a '%' (no space). For instance: 95%.

Interval

If THRESHOLD is an interval, the following units are accepted (not case sensitive): s (second), m (minute), h (hour), d (day). You can use more than one unit per given value. If not set, the last unit is in seconds. For instance: "1h 55m 6" = "1h55m6s".

Size

If THRESHOLD is a size, the following units are accepted (not case sensitive): b (Byte), k (KB), m (MB), g (GB), t (TB), p (PB), e (EB) or Z (ZB). Only integers are accepted. Eg. 1.5MB will be refused, use 1500kB.

The factor between units is 1024 Bytes. Eg. 1g = 1G = 1024\*1024\*1024.

CONNECTIONS

check_pgactivity allows two different connection specifications: by service, or by specifying values for host, user, port, and database. Some services can run on multiple hosts, or needs to connect to multiple hosts.

You must specify one of the parameters below if the service needs to connect to your PostgreSQL instance. In other words, check_pgactivity will NOT look for the libpq environment variables.

The format for connection parameters is:

Parameter --dbservice SERVICE_NAME

Define a new host using the given service. Multiple hosts can be defined by listing multiple services separated by a comma. Eg.
--dbservice service1,service2

Parameters --host HOST, --port PORT, --user ROLE or --dbname DATABASE

One of these parameters is enough to define a new host. If some parameters are missing, default values are used.

If multiple values are given, define as many host as maximum given values.

Values are associated by position. Eg.:
--host h1,h2 --port 5432,5433
Means "host=h1 port=5432" and "host=h2 port=5433".

If the number of values is different between parameters, any host missing a parameter will use the first given value for this parameter. Eg.:
--host h1,h2 --port 5433
Means: "host=h1 port=5433" and "host=h2 port=5433".

Services are defined first

For instance:
--dbservice s1 --host h1 --port 5433
Means use "service=s1" and "host=h1 port=5433" in this order. If the service supports only one host, the second is ignored.

Mutual exclusion between both methods

You can not overwrite services connections variables with parameters --host HOST, --port PORT, --user ROLE or --dbname DATABASE

SERVICES

Descriptions and parameters of available services.

autovacuum (8.1+)

Check the autovacuum activity on the cluster.

Perfdata contains the age of oldest running autovacuum and the number of workers by type (VACUUM, VACUUM ANALYZE, ANALYZE, VACUUM FREEZE).

Thresholds, if any, are ignored.

backends (all)

Check the total number of connections in the PostgreSQL cluster.

Perfdata contains the number of connections per database.

Critical and Warning thresholds accept either a raw number or a percentage (eg. 80%). When a threshold is a percentage, it is compared to the cluster parameter max_connections.

backends_status (8.2+)

Check the status of all backends. Depending on your PostgreSQL version, statuses are: idle, idle in transaction, idle in transaction (aborted)(>=9.0 only), fastpath function call, active, waiting for lock, undefined, disabled and insufficient privilege. insufficient privilege appears when you are not allowed to see the statuses of other connections.

This service supports the argument --exclude REGEX to exclude queries matching the given regular expression from the check.

You can use multiple --exclude REGEX arguments.

Critical and Warning thresholds are optional. They accept a list of 'status_label=value' separated by a comma. Available labels are idle, idle_xact, aborted_xact, fastpath, active and waiting. Values are raw numbers and empty lists are forbidden. Here is an example:
-w 'waiting=5,idle_xact=10' -c 'waiting=20,idle_xact=30'
Perfdata contains the number of backends for each status and the oldest one for each of them, for 8.2+.

Note that the number of backends reported in Nagios message includesexcluded backend.

commit_ratio (all)

Check the commit and rollback rate per second since last call.

This service uses the status file (see --status-file parameter).

Perfdata contains the commit rate, rollback rate, transaction rate and rollback ratio for each database since last call.

Critical and Warning thresholds are optional. They accept a list of coma separated 'label=value'. Available label are rollbacks, rollback_rateand rollback_ratio, which will be compared to the number of rollback, the rollback rate and the rollback ratio of each database. Warning or critical will be raised if reported value is greater than rollbacks, rollback_rate or rollback_ratio.

database_size (8.1+)

Check the variation of database sizes.

This service uses the status file (see --status-file parameter).

Perfdata contains the size difference for each database since the last execution.

Critical and Warning thresholds accept either a raw number, a percentage, or a size (eg. 2.5G).

This service supports both --dbexclude and --dbinclude parameters.

wal_files (8.1+)

Check the number of WAL files.

Perfdata returns the total number of WAL files, current number of written WAL, the current number of recycled WAL and the rate of WAL written to disk since last execution on master clusters.

Critical and Warning thresholds accept either a raw number of files or a percentage. In case of percentage, the limit is computed based on:
100% = 1 + checkpoint_segments * (2 + checkpoint_completion_target)
For PostgreSQL 8.1 and 8.2:
100% = 1 + checkpoint_segments * 2
If wal_keep_segments is set for 9.0 and above, the limit is the greatest of the following formulas :
100% = 1 + checkpoint_segments * (2 + checkpoint_completion_target)
100% = 1 + wal_keep_segments + 2 * checkpoint_segments

ready_archives (8.1+)

Check the number of WAL files ready to archive.

Perfdata returns the number of WAL files waiting to be archived.

Critical and Warning thresholds only accept a raw number of files.

last_analyze (8.2+)

Check on each databases that the oldest analyze (from autovacuum or not) is not older than the given threshold.

This service uses the status file (see --status-file parameter) with PostgreSQL 9.1+.

Perfdata returns oldest analyze per database in seconds. With PostgreSQL 9.1+, the number of [auto]analyses per database since last call is also returned.

Critical and Warning thresholds only accept an interval (eg. 1h30m25s) and apply to the oldest execution of analyse.

This service supports both --dbexclude and --dbinclude parameters.

last_vacuum (8.2+)

Check that the oldest vacuum (from autovacuum or otherwise) in each database in the cluster is not older than the given threshold.

This service uses the status file (see --status-file parameter) with PostgreSQL 9.1+.

Perfdata returns oldest vacuum per database in seconds. With PostgreSQL 9.1+, it also returns the number of [auto]vacuums per database since last execution.

Critical and Warning thresholds only accept an interval (eg. 1h30m25s) and apply to the oldest vacuum.

This service supports both --dbexclude and --dbinclude parameters.

locks (all)

Check the number of locks on the hosts.

Perfdata returns the number of locks, by type.

Critical and Warning thresholds accept either a raw number of locks or a percentage. For percentage, it is computed using the following limits for 7.4 to 8.1:
max_locks_per_transaction * max_connections
for 8.2+:
max_locks_per_transaction * (max_connections + max_prepared_transactions)
for 9.1+, regarding lockmode :
  max_locks_per_transaction * (max_connections + max_prepared_transactions)
or max_pred_locks_per_transaction * (max_connections + max_prepared_transactions)

bgwriter (8.3+)

Check the percentage of pages written by backends since last check.

This service uses the status file (see --status-file parameter).

Perfdata contains the difference from the pg_stat_bgwriter counters since last execution.

Critical and Warning thresholds are optional. If set, they only accept a percentage.

archive_folder

Check if all archived WALs exist between the oldest and the latest WAL in the archive folder and make sure they are 16MB. The given folder must have archived files from ONE cluster. The version of PostgreSQL that created the archives is only checked on the last one, for performance consideration.

This service requires the argument --path on the command line to specify the archive folder path to check.

Optional argument --ignore-wal-size skips the WAL size check. This is useful if your archived WALs are compressed. Default behaviour is to check the WALs size.

Optional argument --suffix allows you define the prefix of your archived WALs. Useful if they are compressed with an extension (eg. .gz, .bz2, ...). Default is no suffix.

Perfdata contains the number of WALs archived and the age of the most recent one.

Critical and Warning define the max age of the latest archived WAL as an interval (eg. 5m or 300s ).

minor_version (all)

Check if the cluster is running the most recent minor version of PostgreSQL.

Latest version of PostgreSQL can be fetched from PostgreSQL official website if check_pgactivity can access it, or is given as a parameter.

Without --critical or --warning parameters, this service attempts to fetch the latest version online. You can optionally set the path to your prefered program using the parameter --path (eg. --path '/usr/bin/wget'). Supported programs are: GET, wget, curl, fetch, lynx, links, links2.

For the online version, a critical alert is raised if the minor version is not the most recent.

If you do not want to (or cannot) query the PostgreSQL website, you must provide the expected version using either --warning OR --critical. The given format must be one or more MINOR versions seperated by anything but a '.'.

For instance, the following parameters are all equivalent:
--critical "9.3.2 9.2.6 9.1.11 9.0.15 8.4.19"
--critical "9.3.2, 9.2.6, 9.1.11, 9.0.15, 8.4.19"
--critical 9.3.2,9.2.6,9.1.11,9.0.15,8.4.19
--critical 9.3.2/9.2.6/9.1.11/9.0.15/8.4.19
Any value other than 3 numbers separated by dots will be ignored. if the running PostgreSQL major version is not found, the service raises an unknown status.

Using the offline version raises either a critical or a warning depending on which one has been set.

Perfdata returns the numerical version of PostgreSQL.

hot_standby_delta (9.0)

Check the data delta between a cluster and its Hot standbys.

You must give the connection parameters for two or more clusters.

Perfdata returns the data delta in bytes between the master and each Hot standby cluster listed.

Critical and Warning thresholds can take one or two values separated by a comma. If only one value given, it applies to both received and replayed data. If two values are given, the first one applies to received data, the second one to replayed ones. These thresholds only accept a size (eg. 2.5G).

This service raise a Critical if it doesn't find exactly ONE valid master cluster (ie. critical when 0 or 2 and more masters).

streaming_delta (9.1+)

Check the data delta between a cluster and its standbys in Streaming Replication.

Optional argument --slave allows you to specify some slaves that MUST be connected. This argument can be used as many times as desired to check multiple slave connections, or you can specify multiple slaves connections at one time, using comma separated values. Both methods can be used in a single call. The given value must be of the form "APPLICATION_NAME IP". Either of the two following examples will check for the presence of two slaves:
--slave 'slave1 192.168.1.11' --slave 'slave2 192.168.1.12'
--slave 'slave1 192.168.1.11','slave2 192.168.1.12'
Perfdata returns the data delta in bytes between the master and all standbys found and the number of slaves connected.

Critical and Warning thresholds can take one or two values separated by a comma. If only one value is supplied, it applies to both flushed and replayed data. If two values are supplied, the first one applies to flushed data, the second one to replayed data. These thresholds only accept a size (eg. 2.5G).

hit_ratio (all)

Check the cache hit ratio on the cluster.

Perfdata returns the cache hit ratio per database. Template databases and databases that do not allow connections will not be checked, nor will the databases which have never been accessed.

Critical and Warning thresholds are optional. They only accept a percentage.

This service supports both --dbexclude and --dbinclude parameters.

backup_label_age (8.1+)

Check the age of the backup label file.

Perfdata returns the age of the backup_label file, -1 if not present.

Critical and Warning thresholds only accept an interval (eg. 1h30m25s).

oldest_2pc (8.1+)

Check the oldest two phase commit transaction (aka. prepared transaction) in the cluster.

Perfdata contains the max/avg age time and the number of prepared transaction per databases.

Critical and Warning thresholds only accept an interval.

oldest_idlexact (8.3+)

Check the oldest idle transaction.

Perfdata contains the max/avg age and the number of idle transactions per databases.

Critical and Warning thresholds only accept an interval.

This service supports both --dbexclude and --dbinclude parameters.

longest_query (all)

Check the longest running query in the cluster.

Perfdata contains the max/avg/min running time and the number of queries per database.

Critical and Warning thresholds only accept an interval.

This service supports both --dbexclude and --dbinclude parameters.

It also supports argument --exclude REGEX to exclude queries matching the given regular expression from the check.

You can use multiple --exclude REGEX parameters.

connection (all)

Perform a simple connection test.

No perfdata is returned.

This service ignore critical and warning arguments.

custom_query (all)

Perform the given user query.

The query is specified with the --query parameter. The first column will be used to perform the test for the status if warning and critical are provided.

The warning and critical arguments are optional. They can be of format integer (default), size or time depending on the --type argument. Warning and Critical will be raised if they are greater than the first column, or less if the --reverse option is used.

All other columns will be used to generate the perfdata. The query must display them in the perfdata format, with unit if required (eg. "size=35B"). If a field contains multiple values, they must be separated by a space.

configuration (8.0+)

Check the most important settings.

Warning and Critical thresholds are ignored.

Specific parameters are : --work_mem, --maintenance_work_mem, --shared_buffers,-- wal_buffers, --checkpoint_segments, --effective_cache_size, --no_check_autovacuum, --no_check_fsync, --no_check_enable, --no_check_track_counts.

max_freeze_age (all)

Checks oldest database by transaction age.

Critical and Warning thresholds are optional. They accept either a raw number or percentage for PostgreSQL 8.2 and more. If percentage is given, the thresholds are computed based on the "autovacuum_freeze_max_age" parameter. 100% means some table(s) reached the maximum age and will trigger an autovacuum freeze. Percentage thresholds should therefore be greater than 100%.

Even with no threshold, this service will raise a critical alert if one database has a negative age.

Perfdata return the age of each database.

This service supports both --dbexclude and --dbinclude parameters.

is_master (all)

Checks if the cluster accepts read and/or write queries. This state is reported as "in production" by pg_controldata.

This service ignores critical and warning arguments.

No perfdata is returned.

is_hot_standby (9.0+)

Checks if the cluster is in recovery and accepts read only queries.

This service ignores critical and warning arguments.

No perfdata is returned.

pga_version

Checks if this script is running the given version of check_pgactivity. You must provide the expected version using either --warning OR --critical.

No perfdata is returned.

is_replay_paused (9.1+)

Checks if the replication is paused. The service will return UNKNOWN if executed on a master server.

Thresholds are optional. They must be specified as interval. OK will always be returned if the standby is not paused, even if replication delta time hits the thresholds.

Critical or warning are raised if last reported replayed timestamp is greater than given threshold AND some data received from the master are not applied yet. OK will always be returned if the standby is paused, or if the standby has already replayed everything from master and until some write activity happens on the master.

Perfdata returned:

* paused status (0 no, 1 yes, NaN if master) * lag time (in second) * data delta with master (0 no, 1 yes)

btree_bloat

Estimate bloat on B-tree indexes.

Warning and critical thresholds accept a comma-separated list of either raw number(for a size), size (eg. 125M) or percentage. The thresholds apply to bloat size, not object size. If a percentage is given, the threshold will apply to the bloat size compared to the total index size. If multiple threshold values are passed, check_pgactivity will choose the largest (bloat size) value.

This service supports both --dbexclude and --dbinclude parameters.

It also supports a --exclude REGEX parameter to exclude relations matching

the given regular expression. The regular expression applies to "database.schema_name.relation_name". This allows you to filter either on a

relation name for all schemas and databases, filter on a qualified named relation (schema + relation) for all databases or filter on a qualified named relation in only one database.

You can use multiple --exclude REGEX parameters.

Warning: With a non-superuser role, only indexes on table the role is granted access to are checked!

Perfdata will return the number of indexes of concern, by warning and critical threshold per database.

table_bloat

Estimate bloat on tables.

Warning and critical thresholds accept a comma-separated list of either raw number(for a size), size (eg. 125M) or percentage. The thresholds apply to bloat size, not object size. If a percentage is given, the threshold will apply to the bloat size compared to the table + TOAST size. If multiple threshold values are passed, check_pgactivity will choose the largest (bloat size) value.

This service supports both --dbexclude and --dbinclude parameters.

This service supports a --exclude REGEX parameter to exclude relations matching the given regular expression. The regular expression applies to "database.schema_name.relation_name". This allows you to filter either on a relation name for all schemas and databases, filter on a qualified named relation (schema + relation) for all databases or filter on a qualified named relation in only one database.

You can use multiple --exclude REGEX parameters.

Warning: With a non-superuser role, this service can only check the tables the given role is granted to read!

Perfdata will return the number of tables matching the warning and critical thresholds, per database.

temp_files (8.1+)

Check the number and size of temp files.

This service uses the status file (see --status-file parameter) for 9.2+.

Perfdata returns the number and total size of temp files found in pgsql_tmp folders. They are aggregated by database until 8.2, then by tablespace (see GUC temp_tablespaces).

Starting with 9.2, perfdata returns as well the number of temp files per database since last run, the total size of temp file per database since last run and the rate at which temp files were generated.

Critical and Warning thresholds are optional. They accept either a number of file (raw value), a size (unit is mandatory to define a size) or both values separated by a comma.

Threshols applied on current temp files beeing created AND the number/size of temp files created since last execution.

EXAMPLES

check_pgactivity -h localhost -p 5492 -s last_vacuum -w 30m -c 1h30m

Execute service "last_vacuum" on host "host=localhost port=5432".

check_pgactivity --debug --dbservice pg92,pg92s --service streaming_delta -w 60 -c 90

Execute service "streaming_delta" between hosts "service=pg92" and "service=pg92s".

check_pgactivity --debug --dbservice pg92 -h slave -U supervisor --service streaming_delta -w 60 -c 90

Execute service "streaming_delta" between hosts "service=pg92" and "host=slave user=supervisor".

check_pgactivity -p 5433 -h slave --service hit_ratio --dbexclude idelone --dbexclude "(?i:sleep)" -w 90% -c 80%

Execute service "hit_ratio" on host "slave" port "5433, excluding database matching the regexps "idelone" and "(?i:sleep)".

check_pgactivity -p 5433 -h slave --service hit_ratio --dbinclude importantone -w 90% -c 80%

Execute service "hit_ratio" on host "slave" port "5433, only for databases matching the regexp "importantone".

LICENSING

This program is open source, licensed under the PostgreSQL license. For license terms, see the LICENSE provided with the sources.

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