{"id":10218,"date":"2021-01-18T18:34:58","date_gmt":"2021-01-18T17:34:58","guid":{"rendered":"http:\/\/arumel.com\/?p=10218"},"modified":"2021-01-18T18:34:58","modified_gmt":"2021-01-18T17:34:58","slug":"replicacion-bdr-y-postgresql","status":"publish","type":"post","link":"https:\/\/arumel.com\/es\/replicacion-bdr-y-postgresql\/","title":{"rendered":"Replicaci\u00f3n BDR y Postgresql"},"content":{"rendered":"

Un cliente con una configuraci\u00f3n bdr defectuosa (cluster dos nodos cuando son necesarios 3) y tras una parada por el uso de secuencias bdr que necesitan un quorum de (n\u00ba nodos \/ 2 + 1) para poder funcionar (y solo funcionaba uno), se le deja con ese \u00fanico nodo para posteriormente ampliar la configuraci\u00f3n bdr a otras 3 m\u00e1quinas (en otro site) para posteriormente borrar el nodo origen y que el cluster con bdr funcione \u00fanicamente en el nuevo site (3 m\u00e1quinas nuevas).<\/p>\n

En las 3 m\u00e1quinas nuevas (destino) inicializamos el cluster postgres sobre ellas:<\/p>\n

-bash-4.2$ \/usr\/pgsql-9.4\/bin\/pg_ctl -D \/postgresql\/autobus\/data initdb<\/strong><\/code>
\nThe files belonging to this database system will be owned by user \"postgres\".<\/code>
\nThis user must also own the server process.<\/code><\/p>\n

The database cluster will be initialized with locale \"en_US.UTF-8\".<\/code>
\nThe default database encoding has accordingly been set to \"UTF8\".<\/code>
\nThe default text search configuration will be set to \"english\".<\/code><\/p>\n

Data page checksums are disabled.<\/code><\/p>\n

fixing permissions on existing directory \/postgresql\/autobus\/data ... ok<\/code>
\ncreating subdirectories ... ok<\/code>
\nselecting default max_connections ... 100<\/code>
\nselecting default shared_buffers ... 128MB<\/code>
\nselecting dynamic shared memory implementation ... posix<\/code>
\ncreating configuration files ... ok<\/code>
\ncreating template1 database in \/postgresql\/autobus\/data\/base\/1 ... ok<\/code>
\ninitializing pg_authid ... ok<\/code>
\ninitializing dependencies ... ok<\/code>
\ncreating system views ... ok<\/code>
\nloading system objects' descriptions ... ok<\/code>
\ncreating collations ... ok<\/code>
\ncreating conversions ... ok<\/code>
\ncreating dictionaries ... ok<\/code>
\nsetting privileges on built-in objects ... ok<\/code>
\ncreating information schema ... ok<\/code>
\nloading PL\/pgSQL server-side language ... ok<\/code>
\nvacuuming database template1 ... ok<\/code>
\ncopying template1 to template0 ... ok<\/code>
\ncopying template1 to postgres ... ok<\/code>
\nsyncing data to disk ... ok<\/code><\/p>\n

WARNING: enabling \"trust\" authentication for local connections<\/code>
\nYou can change this by editing pg_hba.conf or using the option -A, or<\/code>
\n--auth-local and --auth-host, the next time you run initdb.<\/code><\/p>\n

Success. You can now start the database server using:<\/code><\/p>\n

\/usr\/pgsql-9.4\/bin\/postgres -D \/postgresql\/autobus\/data<\/code>
\nor<\/code>
\n\/usr\/pgsql-9.4\/bin\/pg_ctl -D \/postgresql\/autobus\/data -l logfile start<\/code><\/p>\n

 <\/p>\n

Se comprueba la configuraci\u00f3n inicial del cluster bdr en el nodo origen:<\/p>\n

[local]:5432; postgres@autobus # select * from bdr.bdr_nodes;<\/strong><\/code>
\n+---------------------+---------------+------------+-------------+-----------+---------------------------------------------<\/code>
\n+--------------------+----------------+<\/code>
\n| node_sysid | node_timeline | node_dboid | node_status | node_name | node_local_dsn<\/code>
\n| node_init_from_dsn | node_read_only |<\/code>
\n+---------------------+---------------+------------+-------------+-----------+---------------------------------------------<\/code>
\n+--------------------+----------------+<\/code>
\n| 6484326987971901429 | 1 | 16385 | r | node1<\/strong> | port=5432 dbname=autobus host=192.168.100.10<\/code>
\n| NULL | f |<\/code>
\n+---------------------+---------------+------------+-------------+-----------+---------------------------------------------<\/code>
\n+--------------------+----------------+<\/code>
\n(1 row)<\/code><\/p>\n

Time: 1.779 ms<\/code>
\n[local]:5432; postgres@autobus # select * from pg_replication_slots;<\/code>
\n+-----------+--------+-----------+--------+----------+--------+------+--------------+-------------+<\/code>
\n| slot_name | plugin | slot_type | datoid | database | active | xmin | catalog_xmin | restart_lsn |<\/code>
\n+-----------+--------+-----------+--------+----------+--------+------+--------------+-------------+<\/code>
\n+-----------+--------+-----------+--------+----------+--------+------+--------------+-------------+<\/code>
\n(0 rows)<\/code><\/p>\n

Time: 0.802 ms<\/code><\/p>\n

 <\/p>\n

Sobre las 3 m\u00e1quinas destino creamos la base de datos y cargamos la extensi\u00f3n bdr:<\/p>\n

postgres=# create database autobus;<\/strong><\/code>
\nCREATE DATABASE<\/code>
\npostgres=# \\c autobus<\/strong><\/code>
\nYou are now connected to database \"autobus\" as user \"postgres\".<\/code>
\nautobus=# create extension btree_gist;<\/strong><\/code>
\nCREATE EXTENSION<\/code>
\nautobus=# create extension bdr;<\/strong><\/code>
\nCREATE EXTENSION<\/code><\/p>\n

 <\/p>\n

A\u00f1adimos el nuevo nodo a la configuraci\u00f3n bdr desde todas las m\u00e1quinas destino:<\/p>\n

(nodo1-nuevo)<\/strong><\/code><\/p>\n

autobus=# select bdr.bdr_group_join(<\/strong><\/code>
\nlocal_node_name := '192.168.102.20',<\/code><\/strong>
\nnode_external_dsn := 'host=192.168.102.20 port=5434 dbname=autobus',<\/code><\/strong>
\njoin_using_dsn :='host=192.168.100.10 port=5432 dbname=autobus');<\/code><\/strong>
\nbdr_group_join<\/code>
\n----------------<\/code><\/p>\n

(1 row)<\/code><\/p>\n

autobus=# select bdr.bdr_node_join_wait_for_ready();<\/strong><\/code>
\nbdr_node_join_wait_for_ready<\/code>
\n------------------------------<\/code><\/p>\n

(1 row)<\/code><\/p>\n

<\/code><\/p>\n

(nodo2-nuevo)<\/strong><\/code><\/p>\n

autobus=# select bdr.bdr_group_join(<\/strong><\/code>
\nlocal_node_name := '192.168.102.21',<\/code><\/strong>
\nnode_external_dsn := 'host=192.168.102.21 port=5434 dbname=autobus',<\/code><\/strong>
\njoin_using_dsn :='host=192.168.102.20 port=5434 dbname=autobus');<\/code><\/strong>
\n bdr_group_join<\/code>
\n----------------<\/code><\/p>\n

(1 row)<\/code><\/p>\n

autobus=# select bdr.bdr_node_join_wait_for_ready();<\/strong><\/code>
\n bdr_node_join_wait_for_ready<\/code>
\n------------------------------<\/code><\/code><\/p>\n

(1 row)<\/code><\/p>\n

 <\/p>\n

(nodo3-nuevo)<\/strong><\/code><\/p>\n

autobus=# select bdr.bdr_group_join(<\/strong><\/code>
\nlocal_node_name := '192.168.102.22',<\/code><\/strong>
\nnode_external_dsn := 'host=192.168.102.22 port=5434 dbname=autobus',<\/code><\/strong>
\njoin_using_dsn :='host=192.168.102.20 port=5434 dbname=autobus');<\/code><\/strong>
\nbdr_group_join<\/code>
\n----------------<\/code><\/p>\n

(1 row)<\/code><\/p>\n

autobus=# select bdr.bdr_node_join_wait_for_ready();<\/strong><\/code>
\nbdr_node_join_wait_for_ready<\/code>
\n------------------------------<\/code><\/p>\n

(1 row)<\/code><\/p>\n

<\/code><\/p>\n

 <\/p>\n

Comprobamos desde el nodo origen la configuraci\u00f3n final:<\/p>\n

[local]:5432; postgres@autobus # select * from bdr.bdr_nodes;<\/code>
\n+---------------------+---------------+------------+-------------+---------------+---------------------------------------------+---------------------------------------------+----------------+<\/code>
\n| node_sysid | node_timeline | node_dboid | node_status | node_name | node_local_dsn | node_init<\/code>
\n_from_dsn | node_read_only |<\/code>
\n+---------------------+---------------+------------+-------------+---------------+---------------------------------------------+---------------------------------------------+----------------+<\/code>
\n| 6484326987971901429 | 1 | 16385 | r | node1 | port=5432 dbname=autobus host=192.168.100.10 | NULL<\/code>
\n| f |<\/code>
\n| 6906900435321228361 | 1 | 16385 | r | 192.168.102.20 | host=192.168.102.20 port=5434 dbname=autobus | host=192.168.100.10 port=5432 dbname=autobus | f |<\/code>
\n| 6906903421302212953 | 1 | 16385 | r | 192.168.102.21 | host=192.168.102.21 port=5434 dbname=autobus | host=192.168.102.20 port=5434 dbname=autobus | f |<\/code>
\n| 6906906327689680484 | 1 | 16385 | r | 192.168.102.22 | host=192.168.102.22 port=5434 dbname=autobus | host=192.168.102.20 port=5434 dbname=autobus | f |<\/code>
\n+---------------------+---------------+------------+-------------+---------------+---------------------------------------------+---------------------------------------------+----------------+<\/code>
\n(4 rows)<\/code><\/p>\n

Time: 0.718 ms<\/code>
\n[local]:5432; postgres@autobus # select * from pg_replication_slots;<\/code>
\n+-----------------------------------------+--------+-----------+--------+----------+--------+------+--------------+-------------+<\/code>
\n| slot_name | plugin | slot_type | datoid | database | active | xmin | catalog_xmin | restart_lsn |<\/code>
\n+-----------------------------------------+--------+-----------+--------+----------+--------+------+--------------+-------------+<\/code>
\n| bdr_16385_6906906327689680484_1_16385__ | bdr | logical | 16385 | autobus | t | NULL | 79287948 | 9B\/4611F910 |<\/code>
\n| bdr_16385_6906900435321228361_1_16385__ | bdr | logical | 16385 | autobus | t | NULL | 79287948 | 9B\/4611F910 |<\/code>
\n| bdr_16385_6906903421302212953_1_16385__ | bdr | logical | 16385 | autobus | t | NULL | 79287948 | 9B\/4611F910 |<\/code>
\n+-----------------------------------------+--------+-----------+--------+----------+--------+------+--------------+-------------+<\/code>
\n(3 rows)<\/code><\/p>\n

Time: 0.855 ms<\/code><\/p>\n

 <\/p>\n

La eliminaci\u00f3n del nodo origen desde el nodo1-nuevo (puede ser cualquier nodo que no sea el que se va a borrar):<\/p>\n

[local]:5434; postgres@autobus # select * from bdr.bdr_nodes;<\/strong><\/code>
\n+---------------------+---------------+------------+-------------+---------------+---------------------------------------------+---------------------------------------------+----------------+<\/code>
\n| node_sysid | node_timeline | node_dboid | node_status | node_name | node_local_dsn | node_init_from_dsn | node_read_only |<\/code>
\n+---------------------+---------------+------------+-------------+---------------+---------------------------------------------+---------------------------------------------+----------------+<\/code>
\n| 6484326987971901429 | 1 | 16385 | r | node1 | port=5432 dbname=autobus host=192.168.100.10 | NULL | f |<\/strong><\/code>
\n| 6906900435321228361 | 1 | 16385 | r | 192.168.102.20 | host=192.168.102.20 port=5434 dbname=autobus | host=192.168.100.10 port=5432 dbname=autobus | f |<\/code>
\n| 6906903421302212953 | 1 | 16385 | r | 192.168.102.21 | host=192.168.102.21 port=5434 dbname=autobus | host=192.168.102.20 port=5434 dbname=autobus | f |<\/code>
\n| 6906906327689680484 | 1 | 16385 | r | 192.168.102.22 | host=192.168.102.22 port=5434 dbname=autobus | host=192.168.102.20 port=5434 dbname=autobus | f |<\/code>
\n+---------------------+---------------+------------+-------------+---------------+---------------------------------------------+---------------------------------------------+----------------+<\/code>
\n(4 rows)<\/code><\/p>\n

Time: 0.312 ms<\/code>
\n[local]:5434; postgres@autobus # select * from pg_replication_slots;<\/code>
\n+-----------------------------------------+--------+-----------+--------+----------+--------+------+--------------+-------------+<\/code>
\n| slot_name | plugin | slot_type | datoid | database | active | xmin | catalog_xmin | restart_lsn |<\/code>
\n+-----------------------------------------+--------+-----------+--------+----------+--------+------+--------------+-------------+<\/code>
\n| bdr_16385_6484326987971901429_1_16385__ | bdr | logical | 16385 | autobus | t | NULL | 723260 | 0\/BC0C0118 |<\/strong><\/code>
\n| bdr_16385_6906906327689680484_1_16385__ | bdr | logical | 16385 | autobus | t | NULL | 723260 | 0\/BC0C0118 |<\/code>
\n| bdr_16385_6906903421302212953_1_16385__ | bdr | logical | 16385 | autobus | t | NULL | 723260 | 0\/BC0C0118 |<\/code>
\n+-----------------------------------------+--------+-----------+--------+----------+--------+------+--------------+-------------+<\/code>
\n(3 rows)<\/code><\/p>\n

Time: 2.467 ms<\/code><\/p>\n

[local]:5434; postgres@autobus # select bdr.bdr_get_local_nodeid();<\/code>
\n+-------------------------------+<\/code>
\n| bdr_get_local_nodeid |<\/code>
\n+-------------------------------+<\/code>
\n| (6906900435321228361,1,16385) |<\/code>
\n+-------------------------------+<\/code>
\n(1 row)<\/code><\/p>\n

Time: 0.217 ms<\/code>
\n[local]:5434; postgres@autobus # select bdr.bdr_get_local_node_name();<\/code>
\n+-------------------------+<\/code>
\n| bdr_get_local_node_name |<\/code>
\n+-------------------------+<\/code>
\n| 192.168.102.20 |<\/code>
\n+-------------------------+<\/code>
\n(1 row)<\/code><\/p>\n

Time: 0.596 ms<\/code><\/p>\n

[local]:5434; postgres@autobus # select bdr.bdr_part_by_node_names('{node1}');<\/strong><\/code>
\n+------------------------+<\/code>
\n| bdr_part_by_node_names |<\/code>
\n+------------------------+<\/code>
\n| |<\/code>
\n+------------------------+<\/code>
\n(1 row)<\/code><\/p>\n

Time: 2.647 ms<\/code>
\n[local]:5434; postgres@autobus # select * from bdr.bdr_nodes;<\/code>
\n+---------------------+---------------+------------+-------------+---------------+---------------------------------------------+---------------------------------------------+----------------+<\/code>
\n| node_sysid | node_timeline | node_dboid | node_status | node_name | node_local_dsn | node_init_from_dsn | node_read_only |<\/code>
\n+---------------------+---------------+------------+-------------+---------------+---------------------------------------------+---------------------------------------------+----------------+<\/code>
\n| 6906900435321228361 | 1 | 16385 | r | 192.168.102.20 | host=192.168.102.20 port=5434 dbname=autobus | host=192.168.100.10 port=5432 dbname=autobus | f |<\/code>
\n| 6906903421302212953 | 1 | 16385 | r | 192.168.102.21 | host=192.168.102.21 port=5434 dbname=autobus | host=192.168.102.20 port=5434 dbname=autobus | f |<\/code>
\n| 6906906327689680484 | 1 | 16385 | r | 192.168.102.22 | host=192.168.102.22 port=5434 dbname=autobus | host=192.168.102.20 port=5434 dbname=autobus | f |<\/code>
\n| 6484326987971901429 | 1 | 16385 | k<\/span> | node1 | port=5432 dbname=autobus host=192.168.100.10 | NULL | f |<\/strong><\/code>
\n+---------------------+---------------+------------+-------------+---------------+---------------------------------------------+---------------------------------------------+----------------+<\/code>
\n(4 rows)<\/code><\/p>\n

Time: 0.396 ms<\/code>
\n[local]:5434; postgres@autobus # delete from bdr.bdr_nodes where node_status='k<\/span>';<\/strong><\/code>
\nDELETE 1<\/code>
\nTime: 1.061 ms<\/code>
\n[local]:5434; postgres@autobus # select * from bdr.bdr_nodes;<\/code>
\n+---------------------+---------------+------------+-------------+---------------+---------------------------------------------+---------------------------------------------+----------------+<\/code>
\n| node_sysid | node_timeline | node_dboid | node_status | node_name | node_local_dsn | node_init_from_dsn | node_read_only |<\/code>
\n+---------------------+---------------+------------+-------------+---------------+---------------------------------------------+---------------------------------------------+----------------+<\/code>
\n| 6906900435321228361 | 1 | 16385 | r | 192.168.102.20 | host=192.168.102.20 port=5434 dbname=autobus | host=192.168.100.10 port=5432 dbname=autobus | f |<\/code>
\n| 6906903421302212953 | 1 | 16385 | r | 192.168.102.21 | host=192.168.102.21 port=5434 dbname=autobus | host=192.168.102.20 port=5434 dbname=autobus | f |<\/code>
\n| 6906906327689680484 | 1 | 16385 | r | 192.168.102.22 | host=192.168.102.22 port=5434 dbname=autobus | host=192.168.102.20 port=5434 dbname=autobus | f |<\/code>
\n+---------------------+---------------+------------+-------------+---------------+---------------------------------------------+---------------------------------------------+----------------+<\/code>
\n(3 rows)<\/code><\/p>\n

Time: 0.371 ms<\/code><\/p>\n

[local]:5434; postgres@autobus # select * from pg_replication_slots;<\/code>
\n+-----------------------------------------+--------+-----------+--------+----------+--------+------+--------------+-------------+<\/code>
\n| slot_name | plugin | slot_type | datoid | database | active | xmin | catalog_xmin | restart_lsn |<\/code>
\n+-----------------------------------------+--------+-----------+--------+----------+--------+------+--------------+-------------+<\/code>
\n| bdr_16385_6906906327689680484_1_16385__ | bdr | logical | 16385 | autobus | t | NULL | 723844 | 0\/BC3D3168 |<\/code>
\n| bdr_16385_6906903421302212953_1_16385__ | bdr | logical | 16385 | autobus | t | NULL | 723844 | 0\/BC3D3168 |<\/code>
\n+-----------------------------------------+--------+-----------+--------+----------+--------+------+--------------+-------------+<\/code>
\n(2 rows)<\/code><\/p>\n

Time: 0.677 ms<\/code><\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Un cliente con una configuraci\u00f3n bdr defectuosa (cluster dos nodos cuando son necesarios 3) y tras una parada por el uso de secuencias bdr que necesitan un quorum de (n\u00ba nodos \/ 2 + 1) para poder funcionar (y solo funcionaba uno), se le deja con ese \u00fanico nodo para posteriormente ampliar la configuraci\u00f3n bdr […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[65],"tags":[440,439,434,441],"class_list":["post-10218","post","type-post","status-publish","format-standard","hentry","category-postgresql-es","tag-bdr","tag-postgres","tag-postgresql","tag-replication"],"yoast_head":"\nReplicaci\u00f3n BDR y Postgresql - 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Para ello necesitamos activar el servicio a nivel de SO y cargar su librer\u00eda en postgresql. En el fichero de postgresql.conf a\u00f1adimos la siguiente\u2026","rel":"","context":"En "portada"","block_context":{"text":"portada","link":"https:\/\/arumel.com\/es\/portada-es\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/arumel.com\/wp-content\/uploads\/2021\/01\/repmgr-auto-284x300.png?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":10040,"url":"https:\/\/arumel.com\/es\/preparacion-entorno-repmgr-y-postgresql-13-parte-2\/","url_meta":{"origin":10218,"position":2},"title":"Preparaci\u00f3n entorno – Repmgr y Postgresql 13 (parte 2)","author":"sm","date":"12 de enero de 2021","format":false,"excerpt":"Ver configuraci\u00f3n parte1 Registramos el primer nodo en el cluster: [postgres@postgres1 ~]$ repmgr primary register INFO: connecting to primary database... 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