The default limit is to allow 5 restarts in a 10sec period. If a service goes over that threshold due to the Restart= config option in the service definition, it will not attempt to restart any further. The rates are configured with the StartLimitIntervalSec= and StartLimitBurst= options and the Restart= option controls when SystemD tries … Read more
systemd-cat is the equivalent to logger: echo ‘hello’ | systemd-cat In another terminal, running journalctl -f: Feb 07 13:38:33 localhost.localdomain cat[15162]: hello Priorities are specified just by part of the string: echo ‘hello’ | systemd-cat -p info echo ‘hello’ | systemd-cat -p warning echo ‘hello’ | systemd-cat -p emerg Warnings are bold, emergencies are bold … Read more
systemd-analyze is your friend. For example systemd-analyze critical-chain outputs blocking tree of daemons. Mine for example: graphical.target @20.211s └─multi-user.target @20.211s └─nginx.service @19.348s +862ms └─network.target @19.347s └─NetworkManager.service @10.315s +9.031s └─basic.target @10.312s └─timers.target @10.311s └─systemd-tmpfiles-clean.timer @10.311s └─sysinit.target @10.295s └─systemd-update-utmp.service @10.167s +127ms └─systemd-tmpfiles-setup.service @10.124s +41ms └─local-fs.target @10.097s └─home-entd-Downloads.mount @10.093s +2ms └─home.mount @9.326s +672ms └─[email protected] @8.472s +696ms └─dev-sda6.device @8.471s … Read more
Edit for 2016: This Q&A predates the systemd v230 debacle. As of systemd v230, the new default is to kill all children of a terminating login session, regardless of what historically valid precautions were taken to prevent this. The behavior can be changed by setting KillUserProcesses=no in /etc/systemd/logind.conf, or circumvented using the systemd-specific mechanisms for … Read more
After= configures service order (do X only after Y), while Requires= state dependencies. If you don’t specify an order, a service depending on another would be started at the same time as the one it is depending on. Also, the way I understand it (although I can’t test that now and don’t find a reference), … Read more
For units that are defined in actual, static files, this can be seen in systemctl status: $ systemctl status halt-local.service ● halt-local.service – /usr/sbin/halt.local Compatibility Loaded: loaded (/lib/systemd/system/halt-local.service; static) Active: inactive (dead) But there are units that are not defined by files, e.g. with systemd-cron installed. These have no useful location listed with status: $ … Read more
After you make changes to your unit file, you should run systemctl daemon-reload, as outlined here. daemon-reload Reload systemd manager configuration. This will rerun all generators (see systemd.generator(7)), reload all unit files, and recreate the entire dependency tree. While the daemon is being reloaded, all sockets systemd listens on behalf of user configuration will stay … Read more
Times change and so do best practices. The current best way to do this is to run systemctl edit myservice, which will create an override file for you or let you edit an existing one. In normal installations this will create a directory /etc/systemd/system/myservice.service.d, and inside that directory create a file whose name ends in … Read more
Vivek’s answer is correct, however, the setting will only last for the duration of the session. If the host reboots, the setting will be reset to the original value. If you want to set this permanently, you need to edit /etc/sysctl.conf and set vm.max_map_count to 262144. When the host reboots, you can verify that the setting is still correct … Read more
I have an Ubuntu 18.04 image runing on my docker container. I login into it and installed Openresty. also installed systemd. When I use command “systemctl” I get this error: How can I fix it?