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Backup and Recovery Manager for PostgreSQL.

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September 05, 2017
BARMAN(5) Version 2.3 BARMAN(5)

NAME

barman - Backup and Recovery Manager for PostgreSQL

DESCRIPTION

Barman is an administration tool for disaster recovery of PostgreSQL servers written in Python and maintained by 2ndQuadrant. Barman can perform remote backups of multiple servers in business critical environments and helps DBAs during the recovery phase.

CONFIGURATION FILE LOCATIONS

The system-level Barman configuration file is located at /etc/barman.conf or /etc/barman/barman.conf and is overridden on a per-user level by $HOME/.barman.conf

CONFIGURATION FILE SYNTAX

The Barman configuration file is a plain INI file. There is a general section called [barman] and a section [servername] for each server you want to backup. Rows starting with ; are comments.

CONFIGURATION FILE DIRECTORY

Barman supports the inclusion of multiple configuration files, through the configura‐ tion_files_directory option. Included files must contain only server specifications, not global configurations. If the value of configuration_files_directory is a directory, Bar‐ man reads all files with .conf extension that exist in that folder. For example, if you set it to /etc/barman.d, you can specify your PostgreSQL servers placing each section in a separate .conf file inside the /etc/barman.d folder.

OPTIONS

active When set to true (default), the server is in full operational state. When set to false, the server can be used for diagnostics, but any operational command such as backup execution or WAL archiving is temporarily disabled. Setting active=false is a good practice when adding a new node to Barman. Server. archiver This option allows you to activate log file shipping through PostgreSQL's ar‐ chive_command for a server. If set to true (default), Barman expects that continu‐ ous archiving for a server is in place and will activate checks as well as manage‐ ment (including compression) of WAL files that Postgres deposits in the incoming directory. Setting it to false, will disable standard continuous archiving for a server. Global/Server. archiver_batch_size This option allows you to activate batch processing of WAL files for the archiver process, by setting it to a value > 0. Otherwise, the traditional unlimited pro‐ cessing of the WAL queue is enabled. When batch processing is activated, the ar‐ chive-wal process would limit itself to maximum archiver_batch_size WAL segments per single run. Integer. Global/Server. backup_directory Directory where backup data for a server will be placed. Server. backup_method Configure the method barman used for backup execution. If set to rsync (default), barman will execute backup using the rsync command. If set to postgres barman will use the pg_basebackup command to execute the backup. Global/Server. backup_options This option allows you to control the way Barman interacts with PostgreSQL for backups. It is a comma-separated list of values that accepts the following op‐ tions: · exclusive_backup (default when backup_method = rsync): barman backup executes backup operations using the standard exclusive backup approach (technically through pg_start_backup and pg_stop_backup) · concurrent_backup (default when backup_method = postgres): if using PostgreSQL 9.2, 9.3, 9.4, and 9.5, Barman requires the pgespresso module to be installed on the PostgreSQL server and can be used to perform a backup from a standby server. Starting from PostgreSQL 9.6, Barman uses the new PostgreSQL API to perform back‐ ups from a standby server. · external_configuration: if present, any warning regarding external configuration files is suppressed during the execution of a backup. Note that exclusive_backup and concurrent_backup are mutually exclusive. Glob‐ al/Server. bandwidth_limit This option allows you to specify a maximum transfer rate in kilobytes per second. A value of zero specifies no limit (default). Global/Server. barman_home Main data directory for Barman. Global. barman_lock_directory Directory for locks. Default: %(barman_home)s. Global. basebackups_directory Directory where base backups will be placed. Server. basebackup_retry_sleep Number of seconds of wait after a failed copy, before retrying Used during both backup and recovery operations. Positive integer, default 30. Global/Server. basebackup_retry_times Number of retries of base backup copy, after an error. Used during both backup and recovery operations. Positive integer, default 0. Global/Server. check_timeout Maximum execution time, in seconds per server, for a barman check command. Set to 0 to disable the timeout. Positive integer, default 30. Global/Server. compression Standard compression algorithm applied to WAL files. Possible values are: gzip (requires gzip to be installed on the system), bzip2 (requires bzip2), pigz (re‐ quires pigz), pygzip (Python's internal gzip compressor) and pybzip2 (Python's in‐ ternal bzip2 compressor). Global/Server. conninfo Connection string used by Barman to connect to the Postgres server. This is a libpq connection string, consult the PostgreSQL manual (https://www.post‐ gresql.org/docs/current/static/libpq-connect.html#LIBPQ-CONNSTRING) for more infor‐ mation. Commonly used keys are: host, hostaddr, port, dbname, user, password. Server. custom_compression_filter Customised compression algorithm applied to WAL files. Global/Server. custom_decompression_filter Customised decompression algorithm applied to compressed WAL files; this must match the compression algorithm. Global/Server. description A human readable description of a server. Server. errors_directory Directory that contains WAL files that contain an error; usually this is related to a conflict with an existing WAL file (e.g. a WAL file that has been archived after a streamed one). immediate_checkpoint This option allows you to control the way PostgreSQL handles checkpoint at the start of the backup. If set to false (default), the I/O workload for the check‐ point will be limited, according to the checkpoint_completion_target setting on the PostgreSQL server. If set to true, an immediate checkpoint will be requested, meaning that PostgreSQL will complete the checkpoint as soon as possible. Glob‐ al/Server. incoming_wals_directory Directory where incoming WAL files are archived into. Requires archiver to be en‐ abled. Server. last_backup_maximum_age This option identifies a time frame that must contain the latest backup. If the latest backup is older than the time frame, barman check command will report an er‐ ror to the user. If empty (default), latest backup is always considered valid. Syntax for this option is: "i (DAYS | WEEKS | MONTHS)" where i is a integer greater than zero, representing the number of days | weeks | months of the time frame. Global/Server. log_file Location of Barman's log file. Global. log_level Level of logging (DEBUG, INFO, WARNING, ERROR, CRITICAL). Global. max_incoming_wals_queue Maximum number of WAL files in the incoming queue (in both streaming and archiving pools) that are allowed before barman check returns an error (that does not block backups). Global/Server. Default: None (disabled). minimum_redundancy Minimum number of backups to be retained. Default 0. Global/Server. network_compression This option allows you to enable data compression for network transfers. If set to false (default), no compression is used. If set to true, compression is enabled, reducing network usage. Global/Server. parallel_jobs This option controls how many parallel workers will copy files during a backup or recovery command. Default 1. Global/Server. For backup purposes, it works only when backup_method is rsync. path_prefix One or more absolute paths, separated by colon, where Barman looks for executable files. The paths specified in path_prefix are tried before the ones specified in PATH environment variable. Global/server. post_archive_retry_script Hook script launched after a WAL file is archived by maintenance. Being this a retry hook script, Barman will retry the execution of the script until this either returns a SUCCESS (0), an ABORT_CONTINUE (62) or an ABORT_STOP (63) code. In a post archive scenario, ABORT_STOP has currently the same effects as ABORT_CONTINUE. Global/Server. post_archive_script Hook script launched after a WAL file is archived by maintenance, after 'post_ar‐ chive_retry_script'. Global/Server. post_backup_retry_script Hook script launched after a base backup. Being this a retry hook script, Barman will retry the execution of the script until this either returns a SUCCESS (0), an ABORT_CONTINUE (62) or an ABORT_STOP (63) code. In a post backup scenario, ABORT_STOP has currently the same effects as ABORT_CONTINUE. Global/Server. post_backup_script Hook script launched after a base backup, after 'post_backup_retry_script'. Glob‐ al/Server. pre_archive_retry_script Hook script launched before a WAL file is archived by maintenance, after 'pre_ar‐ chive_script'. Being this a retry hook script, Barman will retry the execution of the script until this either returns a SUCCESS (0), an ABORT_CONTINUE (62) or an ABORT_STOP (63) code. Returning ABORT_STOP will propagate the failure at a higher level and interrupt the WAL archiving operation. Global/Server. pre_archive_script Hook script launched before a WAL file is archived by maintenance. Global/Server. pre_backup_retry_script Hook script launched before a base backup, after 'pre_backup_script'. Being this a retry hook script, Barman will retry the execution of the script until this either returns a SUCCESS (0), an ABORT_CONTINUE (62) or an ABORT_STOP (63) code. Return‐ ing ABORT_STOP will propagate the failure at a higher level and interrupt the back‐ up operation. Global/Server. pre_backup_script Hook script launched before a base backup. Global/Server. recovery_options Options for recovery operations. Currently only supports get-wal. get-wal acti‐ vates generation of a basic restore_command in the resulting recovery.conf file that uses the barman get-wal command to fetch WAL files directly from Barman's ar‐ chive of WALs. Comma separated list of values, default empty. Global/Server. retention_policy Policy for retention of periodic backups and archive logs. If left empty, reten‐ tion policies are not enforced. For redundancy based retention policy use "REDUN‐ DANCY i" (where i is an integer > 0 and defines the number of backups to retain). For recovery window retention policy use "RECOVERY WINDOW OF i DAYS" or "RECOVERY WINDOW OF i WEEKS" or "RECOVERY WINDOW OF i MONTHS" where i is a positive integer representing, specifically, the number of days, weeks or months to retain your backups. For more detailed information, refer to the official documentation. De‐ fault value is empty. Global/Server. retention_policy_mode Currently only "auto" is implemented. Global/Server. reuse_backup This option controls incremental backup support. Global/Server. Possible values are: * off: disabled (default); * copy: reuse the last available backup for a serv‐ er and create a copy of the unchanged files (reduce backup time); * link: reuse the last available backup for a server and create a hard link of the unchanged files (reduce backup time and space). Requires operating system and file system support for hard links. slot_name Physical replication slot to be used by the receive-wal command when stream‐ ing_archiver is set to on. Requires PostgreSQL >= 9.4. Global/Server. Default: None (disabled). streaming_archiver This option allows you to use the PostgreSQL's streaming protocol to receive trans‐ action logs from a server. If set to on, Barman expects to find pg_receivexlog in the PATH (see path_prefix option) and that streaming connection for the server is working. This activates connection checks as well as management (including com‐ pression) of WAL files. If set to off (default) barman will rely only on continu‐ ous archiving for a server WAL archive operations, eventually terminating any run‐ ning pg_receivexlog for the server. Global/Server. streaming_archiver_batch_size This option allows you to activate batch processing of WAL files for the stream‐ ing_archiver process, by setting it to a value > 0. Otherwise, the traditional un‐ limited processing of the WAL queue is enabled. When batch processing is activat‐ ed, the archive-wal process would limit itself to maximum streaming_archiv‐ er_batch_size WAL segments per single run. Integer. Global/Server. streaming_archiver_name Identifier to be used as application_name by the receive-wal command. Only avail‐ able with pg_receivexlog >= 9.3. By default it is set to barman_receive_wal. Global/Server. streaming_backup_name Identifier to be used as application_name by the pg_basebackup command. Only available with pg_basebackup >= 9.3. By default it is set to barman_stream‐ ing_backup. Global/Server. streaming_conninfo Connection string used by Barman to connect to the Postgres server via streaming replication protocol. By default it is set to conninfo. Server. streaming_wals_directory Directory where WAL files are streamed from the PostgreSQL server to Barman. Re‐ quires streaming_archiver to be enabled. Server. ssh_command Command used by Barman to login to the Postgres server via ssh. Server. tablespace_bandwidth_limit This option allows you to specify a maximum transfer rate in kilobytes per second, by specifying a comma separated list of tablespaces (pairs TBNAME:BWLIMIT). A val‐ ue of zero specifies no limit (default). Global/Server. wal_retention_policy Policy for retention of archive logs (WAL files). Currently only "MAIN" is avail‐ able. Global/Server. wals_directory Directory which contains WAL files. Server.

HOOK SCRIPTS

The script definition is passed to a shell and can return any exit code. The shell environment will contain the following variables: BARMAN_CONFIGURATION configuration file used by barman BARMAN_ERROR error message, if any (only for the 'post' phase) BARMAN_PHASE 'pre' or 'post' BARMAN_RETRY 1 if it is a retry script (from 1.5.0), 0 if not BARMAN_SERVER name of the server Backup scripts specific variables: BARMAN_BACKUP_DIR backup destination directory BARMAN_BACKUP_ID ID of the backup BARMAN_PREVIOUS_ID ID of the previous backup (if present) BARMAN_STATUS status of the backup BARMAN_VERSION version of Barman Archive scripts specific variables: BARMAN_SEGMENT name of the WAL file BARMAN_FILE full path of the WAL file BARMAN_SIZE size of the WAL file BARMAN_TIMESTAMP WAL file timestamp BARMAN_COMPRESSION type of compression used for the WAL file Only in case of retry hook scripts, the exit code of the script is checked by Barman. Output of hook scripts is simply written in the log file.

EXAMPLE

Here is an example of configuration file: [barman] ; Main directory barman_home = /var/lib/barman ; System user barman_user = barman ; Log location log_file = /var/log/barman/barman.log ; Default compression level ;compression = gzip ; Incremental backup reuse_backup = link ; 'main' PostgreSQL Server configuration [main] ; Human readable description description = "Main PostgreSQL Database" ; SSH options ssh_command = ssh postgres@pg ; PostgreSQL connection string conninfo = host=pg user=postgres ; PostgreSQL streaming connection string streaming_conninfo = host=pg user=postgres ; Minimum number of required backups (redundancy) minimum_redundancy = 1 ; Retention policy (based on redundancy) retention_policy = REDUNDANCY 2

SEE ALSO

barman (1).

AUTHORS

In alphabetical order: · Gabriele Bartolini <@2ndquadrant.it> (architect) · Jonathan Battiato <@2ndquadrant.it> (QA/testing) · Giulio Calacoci <@2ndquadrant.it> (developer) · Francesco Canovai <@2ndquadrant.it> (QA/testing) · Leonardo Cecchi <@2ndquadrant.it> (developer) · Gianni Ciolli <@2ndquadrant.it> (QA/testing) · Britt Cole <@2ndquadrant.com> (documentation) · Marco Nenciarini <@2ndquadrant.it> (project leader) · Rubens Souza <@2ndquadrant.it> (QA/testing) Past contributors: · Carlo Ascani · Stefano Bianucci · Giuseppe Broccolo

RESOURCES

· Homepage: <http://www.pgbarman.org/> · Documentation: <http://docs.pgbarman.org/> · Professional support: <https://www.2ndQuadrant.com/>

COPYING

Barman is the property of 2ndQuadrant Limited and its code is distributed under GNU Gener‐ al Public License v3. Copyright (C) 2011-2017 2ndQuadrant Limited - https://www.2ndQuadrant.com/.

AUTHORS

2ndQuadrant Limited <https://www.2ndQuadrant.com>.
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