{"id":4002,"date":"2023-05-10T05:53:12","date_gmt":"2023-05-10T05:53:12","guid":{"rendered":"https:\/\/test.opensource-db.in\/wp1\/?p=4002"},"modified":"2023-05-10T05:54:52","modified_gmt":"2023-05-10T05:54:52","slug":"enable-core-dumps-on-ubuntu-debian-and-rocky-linux","status":"publish","type":"post","link":"https:\/\/test.opensource-db.in\/wp1\/enable-core-dumps-on-ubuntu-debian-and-rocky-linux\/","title":{"rendered":"Enable core dumps on Ubuntu, Debian, and Rocky Linux"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"538\" src=\"https:\/\/test.opensource-db.in\/wp1\/wp-content\/uploads\/2023\/05\/Core-dump-image-1024x538.png\" alt=\"\" class=\"wp-image-4004\" srcset=\"https:\/\/test.opensource-db.in\/wp1\/wp-content\/uploads\/2023\/05\/Core-dump-image-1024x538.png 1024w, https:\/\/test.opensource-db.in\/wp1\/wp-content\/uploads\/2023\/05\/Core-dump-image-300x158.png 300w, https:\/\/test.opensource-db.in\/wp1\/wp-content\/uploads\/2023\/05\/Core-dump-image-768x403.png 768w, https:\/\/test.opensource-db.in\/wp1\/wp-content\/uploads\/2023\/05\/Core-dump-image-1536x806.png 1536w, https:\/\/test.opensource-db.in\/wp1\/wp-content\/uploads\/2023\/05\/Core-dump-image-2048x1075.png 2048w, https:\/\/test.opensource-db.in\/wp1\/wp-content\/uploads\/2023\/05\/Core-dump-image-189x99.png 189w, https:\/\/test.opensource-db.in\/wp1\/wp-content\/uploads\/2023\/05\/Core-dump-image-152x80.png 152w, https:\/\/test.opensource-db.in\/wp1\/wp-content\/uploads\/2023\/05\/Core-dump-image-394x207.png 394w, https:\/\/test.opensource-db.in\/wp1\/wp-content\/uploads\/2023\/05\/Core-dump-image-915x480.png 915w, https:\/\/test.opensource-db.in\/wp1\/wp-content\/uploads\/2023\/05\/Core-dump-image-1240x651.png 1240w, https:\/\/test.opensource-db.in\/wp1\/wp-content\/uploads\/2023\/05\/Core-dump-image-1920x1008.png 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Core dumps are often used to diagnose or debug errors in Linux or UNIX programs. Core dumps can serve as useful debugging aids for sysadmins to find out why an application or any other program crashed.<br>This article provides some baselines on enabling core dumps on the main Linux distributions and on making a core dump of a process.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A core dump is a file containing a process&#8217;s address space (memory) when the process terminates unexpectedly. Core dumps may be produced on-demand (such as by a debugger), or automatically upon termination. Support engineers may ask for a core dump after a PostgreSQL crash to understand the state of PostgreSQL during the failure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Enabling core dump production changes between the distributions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Below are the instructions for:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Ubuntu 16\/18\/20<\/li><li>Debian 9\/10<\/li><li>Rocky 8\/9<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Ubuntu 16.04 (Xenial) 18.04 (Bionic) 20.04 (Focal)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Since all of them have <code>systemd<\/code> enabled as system and sessions manager, the following is the procedure to enable core dumps:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Systemd will not use <code>\/etc\/security\/limits.conf<\/code>, the limits will be defined in the service unit or in the global <code>systemd<\/code> configuration.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">First, create the directory in which the core dumps will be stored and change <code>kernel.core_pattern<\/code> to store the dumps in the said directory:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># mkdir -p \/var\/coredumps<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">You can choose a different location to store the core dumps, as long as you find a partition with enough free space.<br>Moreover, keep in mind that the users running the <code>postmaster<\/code> service (i.e., <code>postgres<\/code> and\/or <code>enterprisedb<\/code>) will have to be able to write their core dumps in that directory:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># chmod a+w \/var\/coredumps\n\n# sysctl kernel.core_pattern=\/var\/coredumps\/core-%e-%p<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>kernel.core_pattern<\/code> setting can be persisted across reboots:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># echo 'kernel.core_pattern=\/var\/coredumps\/core-%e-%p' &gt;&gt; \/etc\/sysctl.conf<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Then, you can override the PostgreSQL service unit to define the core limit or, alternatively, specify a global default limit for all the services.<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>To set the limit only for the PostgreSQL service, run<\/li><\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>  # systemctl edit postgresql-15.service<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">and paste the following snippet:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  &#91;Service]\n  LimitCORE=infinity<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Then reload the service configuration:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  # systemctl daemon-reload<\/code><\/pre>\n\n\n\n<ol class=\"wp-block-list\"><li>To change the global default you can edit <code>\/etc\/systemd\/system.conf<\/code> setting<\/li><\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>  DefaultLimitCORE=infinity<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">and then restarting <code>systemd<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>  # systemctl daemon-reexec<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Restart PostgreSQL:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># systemctl stop postgresql-15\n# systemctl start postgresql-15<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">At this point, the core dumps should be enabled correctly and you can proceed with the installation of the <code>gdb<\/code> tool and the debug packages.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On <strong>Ubuntu 18.04<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># apt-get install gdb postgresql-15-dbgsym<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">whereas on <strong>Ubuntu 16.04<\/strong> the name of the debug package is slightly different:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># apt-get install gdb postgresql-15-dbg<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Replace the path to a core dump file such as below:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gdb \/usr\/lib\/postgresql\/15\/bin\/postgres \/var\/coredumps\/core-postgres-42317<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">You can see that <code>core-postgres-42317<\/code> is the core dump produced? Finally, you can get a backtrace, running:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(gdb) bt full<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">in the <code>gdb<\/code> console.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Debian 9 (Stretch) and 10 (Buster)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">To enable core dumps on <strong>Debian Stretch<\/strong> and on <strong>Debian Buster<\/strong> you can follow the same procedure we described for <strong>Ubuntu 18.04<\/strong>. The debug package names are the same as well.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">RHEL or Rocky Linux<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">On RHEL\/Rocky Linux 8.x, core file creation is disabled by default. To enable the core file generation, follow the following commands:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Identify the system&#8217;s current limit using the&nbsp;<code>ulimit -c<\/code>&nbsp;or&nbsp;<code>ulimit -a<\/code>&nbsp;command.&nbsp;<code>0<\/code>&nbsp;indicates that core file generation is disabled.<\/li><li>Create the directory to store the core dump &lt;refer to the commands above&gt;<\/li><li>Use the following command to persist the&nbsp;<code>kernel.core_pattern<\/code>&nbsp;setting across reboots:<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>echo 'kernel.core_pattern=\/var\/coredumps\/core-%e-%p' &gt;&gt; \/etc\/sysctl.conf<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Enable core dumps in&nbsp;<code>\/etc\/security\/limits.conf<\/code>&nbsp;to allow a user to create core files. Each line describes a limit for a user in the following form:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;domain&gt;  &lt;type&gt;  &lt;item&gt;  &lt;value&gt;\n   *       soft    core    unlimited<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">The <code>*<\/code>  enables core dump size to be <strong>unlimited.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Edit the core limit in the service file &#8211; <code>\/etc\/systemd\/system\/postgres.service<\/code><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;Service]\nLimitCore=Infinity<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Reload the service configurations to make sure the changes take effect:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># systemctl daemon-reload\n# systemctl stop postgresql-15\n# systemctl start postgresql-15<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Now that the core dumps are enabled, install the&nbsp;<code>gdb<\/code>&nbsp;tool and debug packages for your Operating system:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># yum install gdb\n# debuginfo-install postgresql11-server<\/code><\/pre>\n\n\n\n<pre id=\"block-5e4ff9c0-a937-4fdc-97de-2568819b34d8\" class=\"wp-block-preformatted\">Happy Debugging!<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Core dumps are often used to diagnose or debug errors in Linux or UNIX programs. Core dumps can serve as [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[23,42],"tags":[71,70,26],"class_list":["post-4002","post","type-post","status-publish","format-standard","hentry","category-postgresql-14","category-postgresql-15","tag-debugging","tag-gdb","tag-postgresql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Enable core dumps on Ubuntu, Debian, and Rocky Linux - OpenSource DB<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Enable core dumps on Ubuntu, Debian, and Rocky Linux - OpenSource DB\" \/>\n<meta property=\"og:description\" content=\"Core dumps are often used to diagnose or debug errors in Linux or UNIX programs. 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