How to manage processes with cgroup on Systemd

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Apr 122015
 

systemd is a suite of system management daemons, libraries, and utilities designed as a central management and configuration platform for the GNU/Linux computer operating system.
It provides a system and service manager that runs as PID 1 and starts the rest of the system as alternative to the traditional sysVinit.
systemd provides aggressive parallelization capabilities, uses socket and D-Bus activation for starting services, offers on-demand starting of daemons,

It’s becoming the standard of all the major GNU/Linux distributions and at the moment it’s the default for Arch Linux, Red Hat Enterprise/Centos (version 7), Fedora, Mageia and Suse Enterprise, it’s planned to be used on Debian 8 and Ubuntu 15.04.

There is a lot of people talking for and against systemd on the net as some see it as too intrusive, complex and against the Unix philosophy to keep things simple and make them do just one task.

Using Red Hat 7 at work and Arch Linux on my laptop I’ve started to use it and I must agree that it’s not so simple in the start, but let’s try to take the good thing from it and in this article I’d like to show you some commands that you can use with systemd to manage the processes on a GNU/Linux system and that I’ve found really useful.
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Linux Terminal: Reptyr attach a running process to a new terminal

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Aug 012014
 

If, like me, you work on terminals connected via ssh to remote computer/server you are probably used to tmux and screen and so it’s not a problem if you have to close your session, as you’ll be able to easily re-connect when you need it, but sometimes you could forget about using one of these utility.

Started a long-running process over ssh, but have to leave and don’t want to interrupt it?
Just start a screen, use reptyr to grab it, and then kill the ssh session and head on home.

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Linux Terminal: Manage Processes with killall and kill

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Feb 192014
 

Original article by http://blog.shineservers.com/

Sometime a process “hang” both if you are using Gnu/Linux on your desktop (maybe a game ?) or as server, in these cases the best thing to do it’s to terminate that process, that probably is using precious resources, the basic commands to do this from a terminal are kill and killall.

killall is a tool for ending running processes on your system based on name. In contrast, kill terminates processes based on process ID number or “PID.” kill and killallcan also send specific system signals to processes. Use killall and kill in conjunction with tools including ps to manage processes and end processes that have become stuck or unresponsive when necessary.

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Linux Terminal: pidstat, know everything about your processes

When something goes wrong on your Linux server or desktop, is important to understand which process is taking all the resources, in the past I’ve published some information about top and htop, two great tools to have a general overview of your system with just a glance, but sometimes you need to gather more information […]

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