fix #78

Author: ccErrors

content/3.misc/1.tools-and-utilities/4.utilities/monit.md

@@ -0,0 +1,95 @@
+---
+title: "Monit"
+date: 2023-02-23
+---
+
+Monit is free and open source software that helps you keep track of processes. It can restart services that are not responding or that have crashed. You can use Systemd or daemontools for the same purpose. In this article, we'll show you how to install and configure monit to control processes on Debian or Ubuntu Linux.
+
+## Install
+
+<details><summary>for Centos 7-8</summary>
+
+To install, run the command on the server:
+
+```sh
+yum install epel-release
+yum update
+yum install monit
+systemctl enable monit
+systemctl start monit
+```
+
+</details>
+
+<details><summary>for Debian-like system:</summary>
+
+To install, run the command on the server:
+
+```sh
+sudo apt install monit
+```
+
+</details>
+
+Recommended configuration file `/etc/monit/monitrc`:
+
+```
+set daemon 1
+  with start delay 1
+
+set logfile /var/log/monit.log
+set idfile /var/lib/monit/id
+set statefile /var/lib/monit/state
+
+set httpd port 2812 and
+  use address localhost
+  allow localhost
+
+include /etc/monit/conf.d/*
+```
+
+<details><summary>Configuration file for Astra service</summary>
+
+`/etc/monit/conf.d/astra.conf`
+
+```
+check process astra with pidfile /var/run/astra.pid
+    start program = "/etc/init.d/astra start"
+    stop program = "/etc/init.d/astra stop"
+```
+
+</details>
+
+OR
+
+<details><summary>Configuration file for simple Astra process</summary>
+
+`/etc/monit/conf.d/astra.conf`
+
+```
+check process astra.pid with pidfile /var/run/astra.pid
+    start program = "/bin/sh -c 'ulimit -n 65536;  /usr/bin/astra -c /etc/astra/astra.conf -p 8000 --pid /var/run/astra.pid --log /var/log/astra.log --daemon'"
+    stop program = "/bin/sh -c 'kill `cat /var/run/astra.pid`'"
+```
+
+</details>
+
+Restart monit to apply changes:
+
+```sh
+systemctl restart monit
+```
+
+or
+
+```sh
+sudo /etc/init.d/monit restart
+```
+
+## Commands:
+
+- `monit reload` — reload configuration files
+- `monit summary` — short information
+- `monit start astra` — start Astra
+- `monit stop astra` — stop Astra
+- `monit restart astra` — restart Astra