{"id":27588,"date":"2023-09-05T09:16:09","date_gmt":"2023-09-05T07:16:09","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/?p=27588"},"modified":"2024-09-11T10:18:25","modified_gmt":"2024-09-11T08:18:25","slug":"zabbix-better-storage","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/zabbix-better-storage\/","title":{"rendered":"Zabbix Better Storage"},"content":{"rendered":"\n<p>Among the different possibilities for Zabbix storage, one piqued my curiosity: <strong>TimescaleDB<\/strong><\/p>\n\n\n\n<p>TimescaleDB is a time series database plugin for PostgreSQL. <a href=\"https:\/\/www.dbi-services.com\/blog\/author\/joel-cattin\/\" target=\"_blank\" rel=\"noreferrer noopener\">Jo\u00ebl Cattin<\/a> already blogged about it <a href=\"https:\/\/www.dbi-services.com\/blog\/timescaledb\/\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a> from a general point of view. In this blog post, I will focus on Zabbix setup and visible improvements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-overview\">Overview<\/h2>\n\n\n\n<p>As a reminder, my Zabbix was installed with a PostgreSQL database backend, thus migration to TimescaleDB should be easy. I will follow these steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Install TimescaleDB<\/li>\n\n\n\n<li>Enable TimescaleDB extension in PostgreSQL<\/li>\n\n\n\n<li>Migrate tables to hypertables<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-timescaledb-installation\">TimescaleDB Installation<\/h2>\n\n\n\n<p>Before starting anything, we must stop Zabbix services:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: bash; title: ; notranslate\" title=\"\">\nsystemctl stop zabbix-java-gateway.service\nsystemctl stop zabbix-agent.service\nsystemctl stop zabbix-server.service\n<\/pre><\/div>\n\n\n<p>Next, we can add TimescaleDB repository:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: bash; title: ; notranslate\" title=\"\">\ntee \/etc\/yum.repos.d\/timescale_timescaledb.repo &lt;&lt;EOL\n&#x5B;timescale_timescaledb]\nname=timescale_timescaledb\nbaseurl=https:\/\/packagecloud.io\/timescale\/timescaledb\/el\/$(rpm -E %{rhel})\/\\$basearch\nrepo_gpgcheck=1\ngpgcheck=0\nenabled=1\ngpgkey=https:\/\/packagecloud.io\/timescale\/timescaledb\/gpgkey\nsslverify=1\nsslcacert=\/etc\/pki\/tls\/certs\/ca-bundle.crt\nmetadata_expire=300\nEOL\n<\/pre><\/div>\n\n\n<p>Run a simple <code>yum update<\/code> and install package:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: bash; title: ; notranslate\" title=\"\">\nyum install timescaledb-2-postgresql-15\n<\/pre><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-enable-timescaledb-extension\">Enable TimescaleDB Extension<\/h2>\n\n\n\n<p>Next step is to make PostgreSQL preload the newly installed library by add <code>timescaledb <\/code>to the <code>shared_preload_libraries <\/code>parameter in <code>\/u02\/pgdata\/15\/zabbix\/postgresql.conf<\/code> configuration file:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nshared_preload_libraries = &#039;timescaledb&#039;\n<\/pre><\/div>\n\n\n<p>On a standard Zabbix setup, there will be no existing line with <code>shared_preload_libraries<\/code>. If you have already a line like that, you must add <code>timescaledb <\/code>to the parameter and not replacing it completely.<\/p>\n\n\n\n<p>Then, we need to restart the database:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nsystemctl restart postgres-zabbix.service\n<\/pre><\/div>\n\n\n<p>And we don&#8217;t forget to check it is running after that:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: bash; title: ; notranslate\" title=\"\">\n$ systemctl status postgres-zabbix.service\n\u25cf postgres-zabbix.service - PostgreSQL for Zabbix\n   Loaded: loaded (\/etc\/systemd\/system\/postgres-zabbix.service; enabled; vendor preset: disabled)\n   Active: active (running) since Mon 2023-09-04 15:08:58 CEST; 1s ago\n Main PID: 12370 (postgres)\n    Tasks: 8 (limit: 23220)\n   Memory: 21.6M\n<\/pre><\/div>\n\n\n<p>And one last check to confirm extension is present<sup data-fn=\"8bb334fe-8fc9-40d0-bd0c-2eeeba739945\" class=\"fn\"><a href=\"#8bb334fe-8fc9-40d0-bd0c-2eeeba739945\" id=\"8bb334fe-8fc9-40d0-bd0c-2eeeba739945-link\">1<\/a><\/sup>:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; title: ; notranslate\" title=\"\">\n# select extname, extversion from pg_extension;\n   extname   | extversion\n-------------+------------\n plpgsql     | 1.0\n timescaledb | 2.11.2\n(2 rows)\n<\/pre><\/div>\n\n\n<p>Subsequently, we must enable extension for zabbix database<sup data-fn=\"4fd36762-8ba8-4739-b6aa-331e1bc32483\" class=\"fn\"><a href=\"#4fd36762-8ba8-4739-b6aa-331e1bc32483\" id=\"4fd36762-8ba8-4739-b6aa-331e1bc32483-link\">2<\/a><\/sup>.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: bash; title: ; notranslate\" title=\"\">\necho &quot;CREATE EXTENSION IF NOT EXISTS timescaledb CASCADE;&quot; | sudo -u postgres psql zabbix\n<\/pre><\/div>\n\n\n<p>Expected output is the following:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nWARNING:\nWELCOME TO\n _____ _                               _     ____________\n|_   _(_)                             | |    |  _  \\ ___ \\\n  | |  _ _ __ ___   ___  ___  ___ __ _| | ___| | | | |_\/ \/\n  | | | |  _ ` _ \\ \/ _ \\\/ __|\/ __\/ _` | |\/ _ \\ | | | ___ \\\n  | | | | | | | | |  __\/\\__ \\ (_| (_| | |  __\/ |\/ \/| |_\/ \/\n  |_| |_|_| |_| |_|\\___||___\/\\___\\__,_|_|\\___|___\/ \\____\/\n               Running version 2.11.2\nFor more information on TimescaleDB, please visit the following links:\n\n 1. Getting started: https:\/\/docs.timescale.com\/timescaledb\/latest\/getting-started\n 2. API reference documentation: https:\/\/docs.timescale.com\/api\/latest\n 3. How TimescaleDB is designed: https:\/\/docs.timescale.com\/timescaledb\/latest\/overview\/core-concepts\n\nNote: TimescaleDB collects anonymous reports to better understand and assist our users.\nFor more information and how to disable, please see our docs https:\/\/docs.timescale.com\/timescaledb\/latest\/how-to-guides\/configuration\/telemetry.\n\nCREATE EXTENSION\n<\/pre><\/div>\n\n\n<p>If extension is not preloaded, a message like that will show:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nFATAL:  extension &quot;timescaledb&quot; must be preloaded\nHINT:  Please preload the timescaledb library via shared_preload_libraries.\n<\/pre><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-migrate-tables\">Migrate Tables<\/h2>\n\n\n\n<p>Finally, we can run the sql script provided with Zabbix to migrate tables to hypertables.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: bash; title: ; notranslate\" title=\"\">\n$ cat \/usr\/share\/zabbix-sql-scripts\/postgresql\/timescaledb.sql | sudo -u zabbix psql zabbix\nNOTICE:  PostgreSQL version 15.4 is valid\nNOTICE:  TimescaleDB extension is detected\nNOTICE:  TimescaleDB version 2.11.2 is valid\nNOTICE:  migrating data to chunks\nDETAIL:  Migration might take a while depending on the amount of data.\nNOTICE:  migrating data to chunks\nDETAIL:  Migration might take a while depending on the amount of data.\nWARNING:  column type &quot;character varying&quot; used for &quot;source&quot; does not follow best practices\nHINT:  Use datatype TEXT instead.\nNOTICE:  migrating data to chunks\nDETAIL:  Migration might take a while depending on the amount of data.\nWARNING:  column type &quot;character varying&quot; used for &quot;value&quot; does not follow best practices\nHINT:  Use datatype TEXT instead.\nNOTICE:  migrating data to chunks\nDETAIL:  Migration might take a while depending on the amount of data.\nNOTICE:  migrating data to chunks\nDETAIL:  Migration might take a while depending on the amount of data.\nNOTICE:  migrating data to chunks\nDETAIL:  Migration might take a while depending on the amount of data.\nNOTICE:  TimescaleDB is configured successfully\nDO\n<\/pre><\/div>\n\n\n<p>Database is migrated; thus we can start Zabbix services:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: bash; title: ; notranslate\" title=\"\">\nsystemctl start zabbix-java-gateway.service\nsystemctl start zabbix-agent.service\nsystemctl start zabbix-server.service\n<\/pre><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-verifications\">Verifications<\/h2>\n\n\n\n<p>My first check is to list the created hypertables:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; title: ; notranslate\" title=\"\">\n# select hypertable_name from timescaledb_information.hypertables where owner = &#039;zabbix&#039;;\n hypertable_name\n-----------------\n history\n history_uint\n history_str\n history_text\n history_log\n trends\n trends_uint\n(7 rows)\n<\/pre><\/div>\n\n\n<p>I can also list the list of jobs managed by TimescaleDB<sup data-fn=\"8120a77f-6b22-4df1-801b-c42a4cef16f1\" class=\"fn\"><a href=\"#8120a77f-6b22-4df1-801b-c42a4cef16f1\" id=\"8120a77f-6b22-4df1-801b-c42a4cef16f1-link\">3<\/a><\/sup>:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; title: ; notranslate\" title=\"\">\n# select job_id, application_name, hypertable_name FROM timescaledb_information.jobs;\n job_id |        application_name        | hypertable_name\n--------+--------------------------------+-----------------\n      2 | Error Log Retention Policy &#x5B;2] |\n      1 | Telemetry Reporter &#x5B;1]         |\n   1000 | Compression Policy &#x5B;1000]      | history\n   1001 | Compression Policy &#x5B;1001]      | history_uint\n   1002 | Compression Policy &#x5B;1002]      | history_str\n   1003 | Compression Policy &#x5B;1003]      | history_text\n   1004 | Compression Policy &#x5B;1004]      | history_log\n   1005 | Compression Policy &#x5B;1005]      | trends\n   1006 | Compression Policy &#x5B;1006]      | trends_uint\n(9 rows)\n<\/pre><\/div>\n\n\n<p>My Zabbix server does not ingest so many values (ie. trends, events, tags), thus the advantage on storage might not be so good as on a more loaded server. Nevertheless, I can see some benefits:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; title: ; notranslate\" title=\"\">\n# SELECT pg_size_pretty(before_compression_total_bytes) as &quot;before compression&quot;, pg_size_pretty(after_compression_total_bytes) as &quot;after compression&quot; FROM hypertable_compression_stats(&#039;trends&#039;);\n before compression | after compression\n--------------------+-------------------\n 1272 kB            | 672 kB\n(1 row)\n\n# SELECT pg_size_pretty(before_compression_total_bytes) as &quot;before compression&quot;, pg_size_pretty(after_compression_total_bytes) as &quot;after compression&quot; FROM hypertable_compression_stats(&#039;history_uint&#039;);\n before compression | after compression\n--------------------+-------------------\n 872 kB             | 528 kB\n(1 row)\n<\/pre><\/div>\n\n\n<p>I will add more agent to my Zabbix setup and follow these compression figures closely.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n<ol class=\"wp-block-footnotes\"><li id=\"8bb334fe-8fc9-40d0-bd0c-2eeeba739945\">Use command below to connect to the database:<code><br>sudo -u postgres psql<\/code> <a href=\"#8bb334fe-8fc9-40d0-bd0c-2eeeba739945-link\" aria-label=\"Jump to footnote reference 1\">\u21a9\ufe0e<\/a><\/li><li id=\"4fd36762-8ba8-4739-b6aa-331e1bc32483\">Use sql command below to switch to zabbix database<br><code>\\c zabbix<\/code> <a href=\"#4fd36762-8ba8-4739-b6aa-331e1bc32483-link\" aria-label=\"Jump to footnote reference 2\">\u21a9\ufe0e<\/a><\/li><li id=\"8120a77f-6b22-4df1-801b-c42a4cef16f1\">Jobs are created by Zabbix housekeeper which is run every hour per default <a href=\"#8120a77f-6b22-4df1-801b-c42a4cef16f1-link\" aria-label=\"Jump to footnote reference 3\">\u21a9\ufe0e<\/a><\/li><\/ol>","protected":false},"excerpt":{"rendered":"<p>Among the different possibilities for Zabbix storage, one piqued my curiosity: TimescaleDB TimescaleDB is a time series database plugin for PostgreSQL. Jo\u00ebl Cattin already blogged about it here from a general point of view. In this blog post, I will focus on Zabbix setup and visible improvements. Overview As a reminder, my Zabbix was installed [&hellip;]<\/p>\n","protected":false},"author":40,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"[{\"id\":\"8bb334fe-8fc9-40d0-bd0c-2eeeba739945\",\"content\":\"Use command below to connect to the database:<code><br>sudo -u postgres psql<\\\/code>\"},{\"id\":\"4fd36762-8ba8-4739-b6aa-331e1bc32483\",\"content\":\"Use sql command below to switch to zabbix database<br><code>\\\\c zabbix<\\\/code>\"},{\"id\":\"8120a77f-6b22-4df1-801b-c42a4cef16f1\",\"content\":\"Jobs are created by Zabbix housekeeper which is run every hour per default\"}]"},"categories":[197],"tags":[77,2841,2430],"type_dbi":[],"class_list":["post-27588","post","type-post","status-publish","format-standard","hentry","category-application-integration-middleware","tag-postgresql","tag-timescaledb","tag-zabbix"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Zabbix Better Storage - dbi Blog<\/title>\n<meta name=\"description\" content=\"What could improve current PostgreSQL storage solution? 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