Home > In English, IT-bullshit, System administration > Meet the systemd, or short introduction

Meet the systemd, or short introduction

systemd – is initialization system for other demons to Linux, which came to replace the previously used /sbin/init. Its special feature is the intensive parallelization while start services at boot time, which can significantly speed up the launch of the operating system.
The name comes from the Unix suffix «d» to the demon (c) Wikipedia. In this article, we will speak only about CentOS, but of course, this will also be true for other systems.

A problem often encountered in systemd, when even with seemingly correct configuration, the service does not start. Looking through the logs, you can understand that mistakes are usually standard – for the example of httpd he can not listen to the port, or resolve ldap user. After many experiments, we found the optimal configuration scripts that run in servers correctly.
All startup scripts are in the directory /lib/systemd/system


The file is called httpd.service. The problem is that he did not work until until network subsystem will not loaded and resolving ldap users. For Apache start network-online.target, nss-lookup.target and nss-user-lookup.target must be loaded before Apache. It is easy to understand, if you take a look on config file below:

Description = The Apache HTTP Server
After = network-online.target remote-fs.target nss-lookup.target nss-user-lookup.target
Documentation = man: httpd (8)
Documentation = man: apachectl (8)

Type = notify
EnvironmentFile = /etc/sysconfig/httpd
ExecStart = /usr/sbin/httpd $ OPTIONS -DFOREGROUND
ExecReload = /usr/sbin/ httpd $ OPTIONS -k graceful
ExecStop = /bin/kill -WINCH $ {MAINPID}
KillSignal = SIGCONT
PrivateTmp = true

WantedBy = multi-user.target

Configuring Apache additional instances in systemd

In order to configure Apache to work on multiple ports at once (additional instances or “profiles”), you need to do a little creative action.

Create Apache configs

Additional Apache will listen to another port, so we need an another config file, which will be described. For example, here is this one.

Include conf/Includes/ *. Conf
Include conf/hosting/ *. Conf
Include conf/vhosts/ *. Conf

CustomLog "/var/log/apache/access1.log" combined env =! Dontlog
ErrorLog "/var/log/apache/error1.log"

User apache
Group apache

PidFile /var/run/httpd/httpd1.pid

You must specify a folder with our configs, by analogy with the standard the httpd.conf, be sure to rename the name of the log, enter the user/group of the web server and the pid-file. In fact nothing more is needed for configuration. Let’s call httpd1.conf file for port 8001, httpd2.conf for port 8002 and then more, by analogy, if you need more.

Edit files with parameters

To get started, copy a file from the folder / etc / sysconfig

# Cp httpd httpd1

If you need to do more profiles, copy as needed.
Next, edit the copied a file. Do not touch the default file. All that should be in it, it’s two lines:

OPTIONS = -f conf / httpd1.conf

More, in fact, do not need anything. As you guessed, conf / httpd1.conf is a workpiece Apache config, which we did in the preceding paragraph.

Make and run the service

So, go to the folder with start scripts systemd

# Cd /lib/systemd/system

Copy the current service and a file called names by analogy with configs and files from the sysconfig

# Cp httpd.service httpd1.service.

Edit the config file which we COPIED before, leaving intact a default one

# EnvironmentFile = /etc/sysconfig/httpd

Replace the created us

# EnvironmentFile = /etc/sysconfig/httpd1

Save, switch service on

# Systemctl enable httpd1

Run it

# Systemctl start httpd1.service

Or so – also fulfills

# Systemctl start httpd1

So, you have additional instance Apache.


nginx.service adjusted by analogy – the main thing that against official documentation in “After” was present network-online.target. Also, it is important (applies also, and apache) remote-fs.target option – any occurred after loading it as a Web server files can take, for example, GlusterFS.

Description = The NGINX HTTP and reverse proxy server
After = syslog.target network-online.target remote-fs.target nss-lookup.target

Type = forking
PIDFile = /run/nginx.pid
ExecStartPre = /usr/sbin/nginx -t
ExecStart = /usr/sbin/nginx
ExecReload = /bin/kill -s HUP $ MAINPID
ExecStop = /bin/kill -s QUIT $ MAINPID
PrivateTmp = true

WantedBy = multi-user.target


Similarly configs web server, you need to change in the default script

After = network.target
After = network-online.target


For easy management, systemd has a large number of commands. Know all of them is not necessarily, but here is a list of basic and necessary good to know.


In the case if you edited boot scripts and other components systemd, you can restart it by command:

systemctl daemon-reload

Generate a report on the boot systemd and put it in a file (by the way, it is very useful for understanding the operation of systemd)

systemd-analyze plot> /home/vtorov/boot.svg

Take a look what services are loaded in systemd, or enabled while system start

systemctl list-units --type service

As above, but more and shows the “Target”

systemctl list-units

Switching on and off, reload/restart the service, or other actions (see them below)

systemctl <action> <object>

That is, for example,

systemctl restart httpd

Where restart is an action, but httpd is an object. The list of actions below.



By the way, old chkconfig, redirecting their actions into systemd, but because it will soon be expelled from the CentOS, then to use it is not necessary to devote more time and systemd.

  1. No comments yet.
  1. No trackbacks yet.