MkWikiEnSysOp: Added Networking/Accounting

2021-09-16T18:10:44Z

Added Networking/Accounting

← Older revision		Revision as of 18:10, 16 September 2021
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	[https://bbs.archlinux.org/viewtopic.php?id=129509 Credits] - I have enhanced it by "sudo -u nobody", otherwise anybody with physical access to the system would be able to manipulate it, i.e. killing processes by pressing F9.		[https://bbs.archlinux.org/viewtopic.php?id=129509 Credits] - I have enhanced it by "sudo -u nobody", otherwise anybody with physical access to the system would be able to manipulate it, i.e. killing processes by pressing F9.

			== Networking ==

			=== Accounting ===

			Requires at least version 235 (Debian 11 has 247, Ubuntu 20.04 LTS has 245).

			In the service file, add this in section <nowiki>[[Service]]</nowiki>:

			IPAccounting=yes

			It can also be used for the time a program is running:

			systemd-run -p IPAccounting=1 -t ''program''

			Tested on Ubuntu 20.04: '''Did not work!'''

			[http://0pointer.net/blog/ip-accounting-and-access-lists-with-systemd.html Credits]

	[[Category:Linux]]		[[Category:Linux]]

MkWikiEnSysOp: 4 revisions imported

2018-06-28T17:19:37Z

4 revisions imported

New page

== Booting, Shutting down and the like ==

=== Problems shutting down ===

In case there are problems:

[https://github.com/systemd/systemd/issues/3282#issuecomment-220006014 RFE: when "systemctl poweroff" or "systemctl poweroff -f" fails, because PID 1 is hosed, recommend retrying with "systemctl poweroff -ff"]

== SystemD and tty ==

=== Don't clear tty1 before login screen appears ===

'''Debian 8:''' "edit" command of systemctl is not available.

systemctl edit getty@tty1

[Service]
TTYVTDisallocate=no

[http://askubuntu.com/questions/58097/how-can-i-remove-the-clear-screen-before-login/781923 Credits]

=== Set another number of ttys than 6 ===

In /etc/systemd/logind.conf, locate NAutoVTs and change its value.

[https://wiki.archlinux.org/index.php/Systemd_FAQ#How_do_I_change_the_default_number_of_gettys.3F Credits]

=== journald on tty ===

Let's have journald output on tty12 for example: Create file /etc/systemd/journald.conf.d/fw-tty12.conf (perform mkdir /etc/systemd/journald.conf.d/ if necessary) and put

[Journal]
ForwardToConsole=yes
TTYPath=/dev/tty12
MaxLevelConsole=info

inside this file, then do a

systemctl restart systemd-journald

[https://wiki.archlinux.org/index.php/Systemd#Forward_journald_to_.2Fdev.2Ftty12 Credits]

=== Arbitrary program on specific tty ===

This SystemD service starts "[https://linux.die.net/man/1/htop htop]" on tty11 (as user "nobody" for security reasons):

[Unit]
Description=htop on tty11

[Service]
Type=simple
ExecStart=/usr/bin/sudo -u nobody /usr/bin/htop
StandardInput=tty
StandardOutput=tty
TTYPath=/dev/tty11

[Install]
WantedBy=multi-user.target

It can be saved in <code>/etc/systemd/system</code> as <code>htop.service</code> and later be started by <code>systemctl start htop</code>. If it should be started at boot, <code>systemctl enable htop</code> can be used.

[https://bbs.archlinux.org/viewtopic.php?id=129509 Credits] - I have enhanced it by "sudo -u nobody", otherwise anybody with physical access to the system would be able to manipulate it, i.e. killing processes by pressing F9.

[[Category:Linux]]

SystemD - Revision history

MkWikiEnSysOp: Added Networking/Accounting

MkWikiEnSysOp: 4 revisions imported