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There are various ways and tools to find and list all running services under Fedora / RHEL / CentOS Linux systems.

service command – list running services

The syntax is as follows for CentOS/RHEL 6.x and older (pre systemd):

service --status-all
service --status-all | more
service --status-all | grep ntpd
service --status-all | less

Print the status of any service

To print the status of apache (httpd) service:

service httpd status

List all known services (configured via SysV)

chkconfig --list

List service and their open ports

netstat -tulpn

Turn on / off service

ntsysv
chkconfig service off
chkconfig service on
chkconfig httpd off
chkconfig ntpd on

ntsysv is a simple interface for configuring runlevel services which are also configurable through chkconfig. By default, it configures the current runlevel. Just type ntsysv and select service you want to run.

A note about RHEL/CentOS 7.x with systemd

If you are using systemd based distro such as Fedora Linux v22/23/24 or RHEL/CentOS Linux 7.x+. Try the following command to list running services using the systemctl command. It control the systemd system and service manager.

To list systemd services on CentOS/RHEL 7.x+ use

The syntax is:


systemctl
systemctl | more
systemctl | grep httpd
systemctl list-units --type service
systemctl list-units --type mount

To list all services:

systemctl list-unit-files

Sample outputs:

Fig.01: List all units installed on the CentOS /RHEL 7 systemd based system, along with their current states

To view processes associated with a particular service (cgroup), you can use the systemd-cgtop command. Like the top command, systemd-cgtop lists running processes based on their service:

systemd-cgtop