{"id":12216,"date":"2019-01-30T06:37:55","date_gmt":"2019-01-30T05:37:55","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/postgresql-12-detach-postmaster-process-from-pg_ctls-session-at-server-startup\/"},"modified":"2019-01-30T06:37:55","modified_gmt":"2019-01-30T05:37:55","slug":"postgresql-12-detach-postmaster-process-from-pg_ctls-session-at-server-startup","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/postgresql-12-detach-postmaster-process-from-pg_ctls-session-at-server-startup\/","title":{"rendered":"PostgreSQL 12: Detach postmaster process from pg_ctl&#8217;s session at server startup"},"content":{"rendered":"<p>Recently <a href=\"https:\/\/git.postgresql.org\/gitweb\/?p=postgresql.git;a=commit;h=bb24439cefead34f195c78f400982f3834593df6\" target=\"_blank\" rel=\"noopener noreferrer\">a commit<\/a> landed in the PostgreSQL development tree that made me aware of something I did not know so far: When you start PostgreSQL with a script using <a href=\"https:\/\/www.postgresql.org\/docs\/11\/app-pg-ctl.html\" target=\"_blank\" rel=\"noopener noreferrer\">pg_ctl<\/a> and that script was cancelled the postmaster was killed as well before PostgreSQL 12. Sounds weird? Lets do a little demo.<\/p>\n<p><!--more--><\/p>\n<p>The little demo script is quite simple: Print the version of pg_ctl, startup PostgreSQL and then sleep for 10 seconds:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres@pgbox:\/home\/postgres\/ [PG10] cat start.sh \n#!\/bin\/bash\n\/u01\/app\/postgres\/product\/10\/db_3\/bin\/pg_ctl --version\n\/u01\/app\/postgres\/product\/10\/db_3\/bin\/pg_ctl -D \/u02\/pgdata\/10\/PG103 start\nsleep 10\n<\/pre>\n<p>When you execute that against PostgreSQL before version 12 and then CRTL-C the script while it is sleeping the postmaster will be killed as well:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres@pgbox:\/home\/postgres\/ [PG10] .\/start.sh \npg_ctl (PostgreSQL) 10.5\nwaiting for server to start....2019-01-25 13:00:07.258 CET - 1 - 6853 -  - @ LOG:  listening on IPv4 address \"0.0.0.0\", port 5432\n2019-01-25 13:00:07.259 CET - 2 - 6853 -  - @ LOG:  listening on IPv6 address \"::\", port 5432\n2019-01-25 13:00:07.263 CET - 3 - 6853 -  - @ LOG:  listening on Unix socket \"\/tmp\/.s.PGSQL.5432\"\n2019-01-25 13:00:07.282 CET - 4 - 6853 -  - @ LOG:  redirecting log output to logging collector process\n2019-01-25 13:00:07.282 CET - 5 - 6853 -  - @ HINT:  Future log output will appear in directory \"pg_log\".\n done\nserver started\n^C\npostgres@pgbox:\/home\/postgres\/ [PG10] ps -ef | grep postgres\n<\/pre>\n<p>Starting with PostgreSQL 12 this will not happen anymore:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres@pgbox:\/home\/postgres\/ [PG10] cat start.sh \n#!\/bin\/bash\n\/u01\/app\/postgres\/product\/DEV\/db_1\/bin\/pg_ctl --version\n\/u01\/app\/postgres\/product\/DEV\/db_1\/bin\/pg_ctl -D \/u02\/pgdata\/DEV start\nsleep 10\npostgres@pgbox:\/home\/postgres\/ [PGDEV] .\/start.sh \npg_ctl (PostgreSQL) 12devel\nwaiting for server to start....2019-01-25 13:02:51.690 CET - 1 - 9408 -  - @ LOG:  listening on IPv6 address \"::1\", port 5433\n2019-01-25 13:02:51.690 CET - 2 - 9408 -  - @ LOG:  listening on IPv4 address \"127.0.0.1\", port 5433\n2019-01-25 13:02:51.700 CET - 3 - 9408 -  - @ LOG:  listening on Unix socket \"\/tmp\/.s.PGSQL.5433\"\n2019-01-25 13:02:51.734 CET - 4 - 9408 -  - @ LOG:  redirecting log output to logging collector process\n2019-01-25 13:02:51.734 CET - 5 - 9408 -  - @ HINT:  Future log output will appear in directory \"pg_log\".\n done\nserver started\n^C\npostgres@pgbox:\/home\/postgres\/ [PGDEV] ps -ef | grep postgres\npostgres  9408     1  0 13:02 ?        00:00:00 \/u01\/app\/postgres\/product\/DEV\/db_1\/bin\/postgres -D \/u02\/pgdata\/DEV\npostgres  9409  9408  0 13:02 ?        00:00:00 postgres: logger   \npostgres  9411  9408  0 13:02 ?        00:00:00 postgres: checkpointer   \npostgres  9412  9408  0 13:02 ?        00:00:00 postgres: background writer   \npostgres  9413  9408  0 13:02 ?        00:00:00 postgres: walwriter   \npostgres  9414  9408  0 13:02 ?        00:00:00 postgres: autovacuum launcher   \npostgres  9415  9408  0 13:02 ?        00:00:00 postgres: stats collector   \npostgres  9416  9408  0 13:02 ?        00:00:00 postgres: logical replication launcher   \npostgres  9422 29009  0 13:03 pts\/2    00:00:00 ps -ef\npostgres  9423 29009  0 13:03 pts\/2    00:00:00 grep --color=auto postgres\nroot     29005  2910  0 12:53 ?        00:00:00 sshd: postgres [priv]\npostgres 29008 29005  0 12:53 ?        00:00:01 sshd: postgres@pts\/2\npostgres 29009 29008  0 12:53 pts\/2    00:00:00 -bash\nroot     29463  2910  0 12:54 ?        00:00:00 sshd: postgres [priv]\npostgres 29466 29463  0 12:54 ?        00:00:00 sshd: postgres@pts\/1\npostgres 29467 29466  0 12:54 pts\/1    00:00:00 -bash\n<\/pre>\n<p>Learned something new again.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Recently a commit landed in the PostgreSQL development tree that made me aware of something I did not know so far: When you start PostgreSQL with a script using pg_ctl and that script was cancelled the postmaster was killed as well before PostgreSQL 12. Sounds weird? Lets do a little demo.<\/p>\n","protected":false},"author":28,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229],"tags":[77],"type_dbi":[],"class_list":["post-12216","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","tag-postgresql"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>PostgreSQL 12: Detach postmaster process from pg_ctl&#039;s session at server startup - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/postgresql-12-detach-postmaster-process-from-pg_ctls-session-at-server-startup\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL 12: Detach postmaster process from pg_ctl&#039;s session at server startup\" \/>\n<meta property=\"og:description\" content=\"Recently a commit landed in the PostgreSQL development tree that made me aware of something I did not know so far: When you start PostgreSQL with a script using pg_ctl and that script was cancelled the postmaster was killed as well before PostgreSQL 12. 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