What Are Services And Daemons In Linux?

Daemons:

They are the processes which run in the background and are not interactive. They have no controlling terminal. They perform certain actions at predefined times or in response to certain events. In Linux, the names of daemons end in d. Some examples include httpd, nfsd, sshd,named and lpd. Daemons usually perform critical system tasks such as control swap-space, memory management and various other tasks. Service run on Windows, Daemons run on Linux. In short, system service in Linux are called Daemons.

Introduction to Systemd:

Systemd is a system and service manager for Linux-based operating system for managing services. Systemd as a default “service management tool. Systemd uses “units”, which can be services (.service), mount point (.mount, device(.device), or socket (.socket). The systemctl command manages all these types of unis. In short, Systemd is a suie of tools that provides system and services management for the Linux operating system

Introduction to Systemctl:

system and service manager. To manage services on a systemd enabled for controlling the systemd the systemctl command. To manage services on a systemd enabled server, our main tool is the systemctl command. To view, start, stop, restart, enable, or disable system services daemons, use the systemctl command

Display systemctl version
[root@asim ~]# systemctl –version
Check the installed binaries and libraries
[root@asim ~]# whereis systemctl
To start service
[root@asim ~]# systemctl start httpd.service
Or
[root@asim ~]# systemctl start httpd
Reload the services
[root@asim ~]# systemctl reload httpd
To restart the service
[root@asim ~]# systemctl restart httpd
Check the status of a service
[root@asim ~]# systemctl status httpd
Enable service to start on boot
[root@asim ~]# systemctl enable httpd
Disabled service to not to start  on boot
[root@asim ~]# systemctl disabled httpd
Check if service active or not
[root@asim ~]# systemctl is-active httpd
Check if service enabled or not
[root@asim ~]# systemctl is-enabled httpd
Display a list of properties
[root@asim ~]# systemctl show httpd
Making it impossible to start
[root@asim ~]# systemctl mask httpd
Making it possible to start
[root@asim ~]# systemctl umask httpd
kill a service
[root@asim ~]# systemctl kill httpd
Check all the services running
[root@asim ~]# systemctl –t service

2 thoughts on “What Are Services And Daemons In Linux?”

  1. Tһanks on your marvelous posting! I truly enjoyeⅾ reading it,
    you will be a greаt author. I wіll be ѕure to bookmark yߋur blog and may come back
    down the rоad. I want to encourage one to continuе your great
    work, have a nice holiday weekend!

Leave a Reply

Your email address will not be published. Required fields are marked *