{"id":10057,"date":"2021-01-12T13:12:51","date_gmt":"2021-01-12T12:12:51","guid":{"rendered":"http:\/\/arumel.com\/?p=10057"},"modified":"2021-01-12T13:23:49","modified_gmt":"2021-01-12T12:23:49","slug":"manual-switchover-repmgr-y-postgresql-13","status":"publish","type":"post","link":"https:\/\/arumel.com\/es\/manual-switchover-repmgr-y-postgresql-13\/","title":{"rendered":"Manual switchover – Repmgr y Postgresql 13"},"content":{"rendered":"

\"\"<\/p>\n

Ver configuraci\u00f3n parte 1<\/a><\/p>\n

Ver configuraci\u00f3n parte 2<\/a><\/p>\n

Comprobaci\u00f3n previa estado cluster:<\/p>\n

[postgres@postgres1 ~]$ repmgr cluster show<\/strong><\/code>
\nID | Name | Role | Status | Upstream | Location | Priority | Timeline | Connection string <\/code>
\n----+-----------+---------+-----------+-----------+----------+----------+----------+----------------------------------------------<\/code>
\n1 | postgres1 | primary | * running | | default | 100 | 1 | host=192.168.0.101 user=repmgr dbname=repmgr<\/code>
\n2 | postgres2 | standby | running | postgres1 | default | 100 | 1 | host=192.168.0.102 user=repmgr dbname=repmgr<\/code>
\n3 | postgres3 | standby | running | postgres1 | default | 100 | 1 | host=192.168.0.103 user=repmgr dbname=repmgr<\/code><\/p>\n

 <\/p>\n

Desde el nodo que promocionar\u00e1 ejecutamos de prueba:<\/p>\n

[postgres@postgres2<\/strong> ~]$ repmgr standby switchover --siblings-follow --force-rewind --dry-run<\/strong><\/code>
\nNOTICE: checking switchover on node \"postgres2\" (ID: 2) in --dry-run mode<\/code>
\nINFO: prerequisites for using pg_rewind are met<\/code>
\nINFO: SSH connection to host \"192.168.0.101\" succeeded<\/code>
\nINFO 2>\/dev\/null<\/code>
\nINFO: able to execute \"repmgr\" on remote host \"192.168.0.101\"<\/code>
\nINFO: all sibling nodes are reachable via SSH<\/code>
\nINFO: 2 walsenders required, 10 available<\/code>
\nINFO: demotion candidate is able to make replication connection to promotion candidate<\/code>
\nINFO: 0 pending archive files<\/code>
\nINFO: replication lag on this standby is 0 seconds<\/code>
\nINFO: 2 replication slots required, 10 available<\/code>
\nNOTICE: local node \"postgres2\" (ID: 2) would be promoted to primary; current primary \"postgres1\" (ID: 1) would be demoted to standby<\/code>
\nINFO: following shutdown command would be run on node \"postgres1\":<\/code>
\n\"sudo \/bin\/systemctl stop postgresql-13\"<\/code>
\nINFO: parameter \"shutdown_check_timeout\" is set to 60 seconds<\/code>
\nINFO: prerequisites for executing STANDBY SWITCHOVER are met<\/code><\/p>\n

 <\/p>\n

Lo ejecutamos en real:<\/p>\n

[postgres@postgres2<\/strong> ~]$ repmgr standby switchover --siblings-follow --force-rewind<\/strong><\/code>
\nNOTICE: executing switchover on node \"postgres2\" (ID: 2)<\/code>
\nNOTICE: local node \"postgres2\" (ID: 2) will be promoted to primary; current primary \"postgres1\" (ID: 1) will be demoted to standby<\/code>
\nNOTICE: stopping current primary node \"postgres1\" (ID: 1)<\/code>
\nNOTICE: issuing CHECKPOINT on node \"postgres1\" (ID: 1) <\/code>
\nDETAIL: executing server command \"sudo \/bin\/systemctl stop postgresql-13\"<\/code>
\nINFO: checking for primary shutdown; 1 of 60 attempts (\"shutdown_check_timeout\")<\/code>
\nNOTICE: current primary has been cleanly shut down at location 0\/D000028<\/code>
\nNOTICE: promoting standby to primary<\/code>
\nDETAIL: promoting server \"postgres2\" (ID: 2) using \"\/usr\/pgsql-13\/bin\/pg_ctl -D \/var\/lib\/pgsql\/13\/data promote\"<\/code>
\nwaiting for server to promote.... done<\/code>
\nserver promoted<\/code>
\nNOTICE: waiting up to 60 seconds (parameter \"promote_check_timeout\") for promotion to complete<\/code>
\nNOTICE: STANDBY PROMOTE successful<\/code>
\nDETAIL: server \"postgres2\" (ID: 2) was successfully promoted to primary<\/code>
\nNOTICE: issuing CHECKPOINT on node \"postgres2\" (ID: 2) <\/code>
\nERROR: unable to execute CHECKPOINT<\/code>
\nINFO: local node 1 can attach to rejoin target node 2<\/code>
\nDETAIL: local node's recovery point: 0\/D000028; rejoin target node's fork point: 0\/D0000A0<\/code>
\nINFO: creating replication slot as user \"repmgr\"<\/code>
\nNOTICE: setting node 1's upstream to node 2<\/code>
\nWARNING: unable to ping \"host=192.168.0.101 user=repmgr dbname=repmgr\"<\/code>
\nDETAIL: PQping() returned \"PQPING_NO_RESPONSE\"<\/code>
\nNOTICE: starting server using \"sudo \/bin\/systemctl start postgresql-13\"<\/code>
\nWARNING: node \"postgres1\" not found in \"pg_stat_replication\"<\/code>
\nNOTICE: replication slot \"repmgr_slot_2\" deleted on node 1<\/code>
\nWARNING: 1 inactive replication slots detected<\/code>
\nDETAIL: inactive replication slots:<\/code>
\n- repmgr_slot_3 (physical)<\/code>
\nHINT: these replication slots may need to be removed manually<\/code>
\nNOTICE: NODE REJOIN successful<\/code>
\nDETAIL: node 1 is now attached to node 2<\/code>
\nWARNING: node \"postgres1\" not found in \"pg_stat_replication\"<\/code>
\nINFO: waiting for node \"postgres1\" (ID: 1) to connect to new primary; 1 of max 60 attempts (parameter \"node_rejoin_timeout\")<\/code>
\nDETAIL: checking for record in node \"postgres2\"'s \"pg_stat_replication\" table where \"application_name\" is \"postgres1\"<\/code>
\nNOTICE: node \"postgres2\" (ID: 2) promoted to primary, node \"postgres1\" (ID: 1) demoted to standby<\/code>
\nNOTICE: executing STANDBY FOLLOW on 1 of 1 siblings<\/code>
\nINFO: STANDBY FOLLOW successfully executed on all reachable sibling nodes<\/code>
\nNOTICE: switchover was successful<\/code>
\nDETAIL: node \"postgres2\" is now primary and node \"postgres1\" is attached as standby<\/code>
\nNOTICE: STANDBY SWITCHOVER has completed successfully<\/code><\/p>\n

Comprobaci\u00f3n del cluster posterior (atenci\u00f3n porque el nodo postgres3 cambia a apuntar a la nueva primary – siblings_follow -):<\/p>\n

[postgres@postgres1 ~]$ repmgr cluster show<\/strong><\/code>
\nID | Name | Role | Status | Upstream | Location | Priority | Timeline | Connection string <\/code>
\n----+-----------+---------+-----------+-----------+----------+----------+----------+----------------------------------------------<\/code>
\n1 | postgres1 | standby | running | postgres2 | default | 100 | 1 | host=192.168.0.101 user=repmgr dbname=repmgr<\/code>
\n2 | postgres2 | primary | * running | | default | 100 | 2 | host=192.168.0.102 user=repmgr dbname=repmgr<\/code>
\n3 | postgres3 | standby | running | postgres2 | default | 100 | 2 | host=192.168.0.103 user=repmgr dbname=repmgr<\/code><\/p>\n

[postgres@postgres1 ~]$ repmgr cluster event <\/strong><\/code>
\nNode ID | Name | Event | OK | Timestamp | Details <\/code>
\n---------+-----------+--------------------+----+---------------------+--------------------------------------------------------------------------------------------<\/code>
\n3 | postgres3 | standby_follow | t | 2021-01-07 17:33:20 | standby attached to upstream node \"postgres2\" (ID: 2) <\/code>
\n2 | postgres2 | standby_switchover | t | 2021-01-07 17:33:19 | node \"postgres2\" (ID: 2) promoted to primary, node \"postgres1\" (ID: 1) demoted to standby<\/code>
\n2 | postgres2 | standby_promote | t | 2021-01-07 17:33:16 | server \"postgres2\" (ID: 2) was successfully promoted to primary <\/code>
\n3 | postgres3 | standby_register | t | 2021-01-07 17:09:56 | standby registration succeeded; upstream node ID is 1 <\/code>
\n3 | postgres3 | standby_clone | t | 2021-01-07 17:08:55 | cloned from host \"192.168.0.101\", port 5432; backup method: pg_basebackup; --force: N <\/code>
\n2 | postgres2 | standby_register | t | 2021-01-07 17:05:09 | standby registration succeeded; upstream node ID is 1 <\/code>
\n2 | postgres2 | standby_clone | t | 2021-01-07 17:01:55 | cloned from host \"192.168.0.101\", port 5432; backup method: pg_basebackup; --force: N <\/code>
\n2 | postgres2 | standby_clone | t | 2021-01-07 16:59:49 | cloned from host \"192.168.0.101\", port 5432; backup method: pg_basebackup; --force: N <\/code>
\n1 | postgres1 | primary_register | t | 2021-01-07 16:39:53 | <\/code>
\n1 | postgres1 | cluster_created | t | 2021-01-07 16:39:53 |<\/code><\/p>\n

 <\/p>\n

Ver failover<\/a><\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

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

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NOTICE: attempting to install extension \"repmgr\" NOTICE: \"repmgr\" extension successfully installed NOTICE: primary node record (ID: 1) registered \u00a0 Mostramos el estado del cluster: [postgres@postgres1 ~]$ repmgr cluster show ID\u2026","rel":"","context":"En "PostgreSQL"","block_context":{"text":"PostgreSQL","link":"https:\/\/arumel.com\/es\/postgresql-es\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":10063,"url":"https:\/\/arumel.com\/es\/manual-failover-repmgr-y-postgresql-13\/","url_meta":{"origin":10057,"position":1},"title":"Manual failover – Repmgr y Postgresql 13","author":"sm","date":"12 de enero de 2021","format":false,"excerpt":"Ver configuraci\u00f3n parte 1. Ver configuraci\u00f3n parte 2. Ver switchover manual. Estado previo del cluster: [postgres@postgres1 ~]$ repmgr cluster show ID | Name | Role | Status | Upstream | Location | Priority | Timeline | Connection string ----+-----------+---------+-----------+-----------+----------+----------+----------+---------------------------------------------- 1 | postgres1 | standby | running | postgres2 | default\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-manual-300x183.png?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":10087,"url":"https:\/\/arumel.com\/es\/auto-failover-repmgr-y-postgresql-13-parte-2\/","url_meta":{"origin":10057,"position":2},"title":"Auto failover – Repmgr y Postgresql 13 (parte 2)","author":"sm","date":"12 de enero de 2021","format":false,"excerpt":"Ver configuraci\u00f3n de la parte 1. El estado previo del cluster es el siguiente: [postgres@postgres1 ~]$ repmgr cluster show ID | Name | Role | Status | Upstream | Location | Priority | Timeline | Connection string ----+-------------------+---------+-----------+-----------+----------+----------+----------+---------------------------------------------- 1 | postgres1 | primary | * running | | default |\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":10119,"url":"https:\/\/arumel.com\/es\/failover-auto-pgbouncer-repmgr-postgresql-13-parte-4\/","url_meta":{"origin":10057,"position":3},"title":"Failover auto – Pgbouncer + Repmgr + Postgresql 13 (parte 4)","author":"sm","date":"12 de enero de 2021","format":false,"excerpt":"Ver parte 1 Ver parte 2 Ver parte 3 Vamos a hacer una prueba de balanceo autom\u00e1tico tras la p\u00e9rdida del nodo primario (postgres2) y como balancea el failover a un nodo secundario (postgres1), tras la parada de la conexiones en el pgbouncer, posterior reconfiguraci\u00f3n, y conexi\u00f3n posterior al nuevo\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\/pgbouncer-repmgr-auto-285x300.png?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/arumel.com\/wp-content\/uploads\/2021\/01\/pgbouncer-repmgr-auto-285x300.png?resize=350%2C200 1x, https:\/\/i0.wp.com\/arumel.com\/wp-content\/uploads\/2021\/01\/pgbouncer-repmgr-auto-285x300.png?resize=525%2C300 1.5x"},"classes":[]},{"id":10067,"url":"https:\/\/arumel.com\/es\/auto-failover-repmgr-y-postgresql-13-parte-1\/","url_meta":{"origin":10057,"position":4},"title":"Auto failover – Repmgr y Postgresql 13 (parte 1)","author":"sm","date":"12 de enero de 2021","format":false,"excerpt":"Si repasamos las entradas anteriores Parte1 y Parte2, vemos que tenemos configurado el repmgr pero no hemos activado el demonio para que haga el chequeo continuo. 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":9995,"url":"https:\/\/arumel.com\/es\/preparacion-entorno-repmgr-y-postgresql-13-parte-1\/","url_meta":{"origin":10057,"position":5},"title":"Preparaci\u00f3n entorno – Repmgr y Postgresql 13 (parte 1)","author":"sm","date":"12 de enero de 2021","format":false,"excerpt":"\u00a0 Nos disponemos a preparar un entorno sobre el que realizar pruebas con repmgr 13 (versi\u00f3n 5.2) y postgresql versi\u00f3n 13. En nuestro caso se tratar\u00e1 de un OEL 8.3 (con kernel de redhat). Una vez creada la primera m\u00e1quina virtual procedemos a la instalaci\u00f3n de los repositorios y desactivar\u2026","rel":"","context":"En "PostgreSQL"","block_context":{"text":"PostgreSQL","link":"https:\/\/arumel.com\/es\/postgresql-es\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/arumel.com\/wp-content\/uploads\/2021\/01\/repmgr-manual.png?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/arumel.com\/wp-content\/uploads\/2021\/01\/repmgr-manual.png?resize=350%2C200 1x, https:\/\/i0.wp.com\/arumel.com\/wp-content\/uploads\/2021\/01\/repmgr-manual.png?resize=525%2C300 1.5x"},"classes":[]}],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/arumel.com\/es\/wp-json\/wp\/v2\/posts\/10057","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/arumel.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/arumel.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/arumel.com\/es\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/arumel.com\/es\/wp-json\/wp\/v2\/comments?post=10057"}],"version-history":[{"count":14,"href":"https:\/\/arumel.com\/es\/wp-json\/wp\/v2\/posts\/10057\/revisions"}],"predecessor-version":[{"id":10188,"href":"https:\/\/arumel.com\/es\/wp-json\/wp\/v2\/posts\/10057\/revisions\/10188"}],"wp:attachment":[{"href":"https:\/\/arumel.com\/es\/wp-json\/wp\/v2\/media?parent=10057"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/arumel.com\/es\/wp-json\/wp\/v2\/categories?post=10057"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/arumel.com\/es\/wp-json\/wp\/v2\/tags?post=10057"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}