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Zabbix: Add idle_connections monitoring item #1

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6 changes: 6 additions & 0 deletions defaults/main.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -59,3 +59,9 @@ pgsql_users: []
# - name: database1
# owner: user1
pgsql_databases: []

# Zabbix/monitoring part
psql_zabbix_templates:
- Template CentOS PostgreSQL server
psql_zabbix_groups:
- CentOS PostgreSQL servers
16 changes: 16 additions & 0 deletions files/psql-monitoring-checks.sh
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@@ -0,0 +1,16 @@


#!/bin/bash

# Managed by Ansible : don't edit !
# Purposes : checks some services locally (like kojira or others) and send status to zabbix
# Called by: cron
#

# Check idle_connections in PostgreSQL
cd /tmp # avoid dir_read issues with sudo
idle=$(sudo -u postgres psql koji -A -t -F" " \
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@arrfab arrfab Nov 28, 2025

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We don't need/want to hardcode a db name for postgresql activity itself, as koji db doesn't exist everywhere :)

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@GregSutcliffe GregSutcliffe Nov 28, 2025

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good catch, let me template that

-c "select state, count(*) from pg_stat_activity where state = 'idle' and pid <> pg_backend_pid() group by 1 order by 1;" |\
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@arrfab arrfab Nov 28, 2025

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Wondering (just another metric) selecting active, idle , others, and the three together == count() from pg_stat_activity , or just count() from pg_activity ?

select count(*) from pg_stat_activity ; 
 count 
-------
    91

 select state, count(*) from pg_stat_activity  where pid <> pg_backend_pid() group by 1 order by 1;
 state  | count 
--------+-------
 active |     4
 idle   |    93
        |     5

There can be time were there is no active connections and that's fine too (so sending zero)

cut -f2 -d" ")

zabbix_sender -c /etc/zabbix/zabbix_agentd.conf -k psql.idle_connections -o $idle >/dev/null 2>&1
4 changes: 4 additions & 0 deletions tasks/main.yml
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Expand Up @@ -100,3 +100,7 @@
name: centos-backup
tasks_from: client

- name: Include monitoring
ansible.builtin.include_tasks: monitoring.yml
tags:
- monitoring
26 changes: 26 additions & 0 deletions tasks/monitoring.yml
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- name: Add host in Zabbix UI
block:
- name: Configuring agent in Zabbix server
ansible.builtin.include_role:
name: zabbix-server
tasks_from: agent_config
vars:
zabbix_templates: "{{ psql_zabbix_templates }}"
zabbix_groups: "{{ psql_zabbix_groups }}"
tags:
- monitoring
delegate_to: "{{ zabbix_api_srv }}"
when: zabbix_api_srv is defined

- name: Distribute local PostgreSQL idle_connections check
copy:
src: files/psql-monitoring-checks.sh
dest: /usr/lib/zabbix/psql-monitoring-checks.sh
mode: 0750
owner: root

- name: Zabbix cron jobs
ansible.builtin.cron:
name: PostgreSQL monitoring
job: /usr/lib/zabbix/psql-monitoring-checks.sh
minute: "*/5"