Systemd - Revision history

M: /* Logging */

2022-11-07T20:00:12Z

Logging

← Older revision		Revision as of 20:00, 7 November 2022
Line 14:		Line 14:
	service network-manager restart		service network-manager restart

	=== ~~Logging~~ ===		=== Log limit ===
	Prevent systemd from casually eating your entire drive with logs by clipping it, here:		Prevent systemd from casually eating your entire drive with logs by clipping it, here:
	$ sudo emacs /etc/systemd/journald.conf		$ sudo emacs /etc/systemd/journald.conf
Line 21:		Line 21:
	# MBM do not let systemd logs fill drive		# MBM do not let systemd logs fill drive
	SystemMaxUse=200M		SystemMaxUse=200M
			Then reload config:
			sudo systemctl daemon-reload

	=== NTP ===		=== NTP ===

M: /* Logging */

2022-11-07T19:58:49Z

Logging

← Older revision		Revision as of 19:58, 7 November 2022
Line 18:		Line 18:
	$ sudo emacs /etc/systemd/journald.conf		$ sudo emacs /etc/systemd/journald.conf

	[Journal]		[Journal]
	# MBM do not let systemd logs fill drive		# MBM do not let systemd logs fill drive
	SystemMaxUse=200M		SystemMaxUse=200M

	=== NTP ===		=== NTP ===

M at 19:58, 7 November 2022

2022-11-07T19:58:31Z

← Older revision		Revision as of 19:58, 7 November 2022
Line 13:		Line 13:
	dpkg-reconfigure resolvconf		dpkg-reconfigure resolvconf
	service network-manager restart		service network-manager restart

			=== Logging ===
			Prevent systemd from casually eating your entire drive with logs by clipping it, here:
			$ sudo emacs /etc/systemd/journald.conf

			[Journal]
			# MBM do not let systemd logs fill drive
			SystemMaxUse=200M

	=== NTP ===		=== NTP ===

M: /* Timers */

2021-04-08T14:59:42Z

Timers

← Older revision		Revision as of 14:59, 8 April 2021
Line 28:		Line 28:
	Use these in place of cron. Each one typically does one task.		Use these in place of cron. Each one typically does one task.

	~~systemd timer services~~		[https://www.certdepot.net/rhel7-use-systemd-timers/ systemd timer services]
	~~----------------------~~
	https://www.certdepot.net/rhel7-use-systemd-timers/

	create a script to do the work:		create a script to do the work:
	echo "/usr/sbin/logrotate /etc/logrotate.conf" >/usr/local/sbin/logrotate.sh		echo "/usr/sbin/logrotate /etc/logrotate.conf" >/usr/local/sbin/logrotate.sh

			create a service file:
			nano /usr/lib/systemd/system/logrotate.service
			[Unit]
			Description=Rotate logs

	~~create a service file:~~		[Service]
	~~nano~~ /usr/~~lib~~/~~systemd/system~~/logrotate.~~service~~		Type=simple
	~~[Unit]~~		ExecStart=/usr/local/sbin/logrotate.sh
	~~Description~~=~~Rotate logs~~		User=root

	[~~Service~~]		[Install]
	~~Type~~=~~simple~~		WantedBy=multi-user.target
	~~ExecStart=~~/usr/~~local~~/~~sbin~~/logrotate.sh
	~~User~~=~~root~~		create a timer file:
			nano /usr/lib/systemd/system/logrotate.timer
			[Unit]
			Description=Rotate logs as needed every night at 2am

	[~~Install~~]		[Timer]
	~~WantedBy~~=~~multi~~-~~user~~.~~target~~		OnCalendar=--* 02:00:00
			Unit=logrotate.service

	~~create a timer file:~~		[Install]
	~~nano /usr/lib/systemd/system/logrotate.timer~~		WantedBy=multi-user.target
	[~~Unit~~]
	~~Description~~=~~Rotate logs as needed every night at 2am~~

	~~[Timer]~~		activate on boot:
	~~OnCalendar=--* 02:00:00~~		# NOTE you must enable the service (even though not run directly), plus the timer
	~~Unit=logrotate.service~~		# then start the timer
			systemctl enable logrotate
	~~[Install]~~		systemctl enable logrotate.timer
	~~WantedBy=multi-user.target~~		systemctl start logrotate.timer
			utils:
	activate on boot:		systemctl is-enabled ####.timer
	# NOTE you must enable the service (even though not run directly), plus the timer		systemctl is-active ####.timer # to see if timer is active and enabled
	# then start the timer		systemctl start #### # to run service immediately
	systemctl enable logrotate		systemctl status #### # nice status output
	systemctl enable logrotate.timer		systemctl daemon-reload # to restart services after config changes
	systemctl start logrotate.timer		systemctl list-timers [####*] # to list timers that start with #####

	utils:
	systemctl is-enabled ####.timer
	systemctl is-active ####.timer # to see if timer is active and enabled
	systemctl start #### # to run service immediately
	systemctl status #### # nice status output
	systemctl daemon-reload # to restart services after config changes
	systemctl list-timers [####*] # to list timers that start with #####

	=== Creating a custom managed service ===		=== Creating a custom managed service ===

M: /* DNS */

2021-04-03T13:28:17Z

DNS

@@ Line 13: / Line 13: @@
   dpkg-reconfigure resolvconf
   service network-manager restart
 === NTP ===

M: /* DNS */

2021-04-03T13:27:51Z

DNS

← Older revision		Revision as of 13:27, 3 April 2021
Line 3:		Line 3:
	=== DNS ===		=== DNS ===

	''UPDATE'': it ~~might be~~ working now in Ubuntu 18.04, ~~try this to turn~~ it back on:		''UPDATE'': it is working now in Ubuntu 20.04 with my dnsmasq DHCP serving up my 192.168.22.1 nameserver, YAY.

			Turn it back on:
	sudo su -		sudo su -
			rm -f /etc/resolv.conf
			ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf
			systemctl unmask systemd-resolved
	systemctl enable systemd-resolved		systemctl enable systemd-resolved
	dpkg-reconfigure resolvconf		dpkg-reconfigure resolvconf

M: /* Creating a custom managed service */

2021-02-15T04:56:32Z

Creating a custom managed service

← Older revision		Revision as of 04:56, 15 February 2021
Line 101:		Line 101:
	ExecStart=/usr/bin/screen -d -m -fa -S rtorrent /usr/bin/rtorrent		ExecStart=/usr/bin/screen -d -m -fa -S rtorrent /usr/bin/rtorrent
	ExecStop=/usr/bin/killall -w -s 2 /usr/bin/rtorrent		ExecStop=/usr/bin/killall -w -s 2 /usr/bin/rtorrent
	WorkingDirectory=%h		WorkingDirectory=/home/m/download/torrents/rtorrent
	[Install]		[Install]
	WantedBy=default.target		WantedBy=default.target

M: /* Creating a custom managed service */

2021-02-15T04:25:27Z

Creating a custom managed service

← Older revision		Revision as of 04:25, 15 February 2021
Line 88:		Line 88:
	Let's get an official systemd service going! This example is for rtorrent on bandit.		Let's get an official systemd service going! This example is for rtorrent on bandit.

	~~```~~		<pre>
	emacs /etc/systemd/system/rtorrent.service		emacs /etc/systemd/system/rtorrent.service
	------------		------------
Line 108:		Line 108:
	systemctl enable rtorrent.service		systemctl enable rtorrent.service
	systemctl start rtorrent		systemctl start rtorrent
	~~```~~		</pre>

M at 04:25, 15 February 2021

2021-02-15T04:25:08Z

← Older revision		Revision as of 04:25, 15 February 2021
Line 83:		Line 83:
	systemctl daemon-reload # to restart services after config changes		systemctl daemon-reload # to restart services after config changes
	systemctl list-timers [####*] # to list timers that start with #####		systemctl list-timers [####*] # to list timers that start with #####

			=== Creating a custom managed service ===

			Let's get an official systemd service going! This example is for rtorrent on bandit.

			```
			emacs /etc/systemd/system/rtorrent.service
			------------

			[Unit]
			Description=rTorrent
			After=network.target
			[Service]
			User=m
			Type=forking
			KillMode=none
			ExecStart=/usr/bin/screen -d -m -fa -S rtorrent /usr/bin/rtorrent
			ExecStop=/usr/bin/killall -w -s 2 /usr/bin/rtorrent
			WorkingDirectory=%h
			[Install]
			WantedBy=default.target

			--------------
			systemctl enable rtorrent.service
			systemctl start rtorrent
			```

M: /* DNS */

2019-09-11T23:35:22Z

DNS

← Older revision		Revision as of 23:35, 11 September 2019
Line 2:		Line 2:

	=== DNS ===		=== DNS ===

			''UPDATE'': it might be working now in Ubuntu 18.04, try this to turn it back on:
			sudo su -
			systemctl enable systemd-resolved
			dpkg-reconfigure resolvconf
			service network-manager restart

			''TO KILL IT''

	You should probably turn off systemd-resolved and manually configure /etc/resolv.conf, since systemd sucks the chrome off a donkey's ballbearings.		You should probably turn off systemd-resolved and manually configure /etc/resolv.conf, since systemd sucks the chrome off a donkey's ballbearings.