### It’s possible to check all services like follow:
# the list of all services
[root@testos]# systemctl list-unit-files -t service UNIT FILE STATE abrt-ccpp.service enabled abrt-oops.service enabled abrt-pstoreoops.service disabled abrt-vmcore.service enabled abrt-xorg.service enabled abrtd.service enabled arp-ethers.service disabled atd.service enabled auditd.service disabled auth-rpcgss-module.service static autofs.service disabled autovt@.service enabled blk-availability.service disabled brandbot.service static certmonger.service enabled chrony-dnssrv@.service static chrony-wait.service disabled chronyd.service disabled console-getty.service disabled console-shell.service disabled container-getty@.service static containerd.service disabled cpupower.service disabled crond.service enabled dbus-org.freedesktop.hostname1.service static dbus-org.freedesktop.import1.service static dbus-org.freedesktop.locale1.service static dbus-org.freedesktop.login1.service static dbus-org.freedesktop.machine1.service static dbus-org.freedesktop.timedate1.service static dbus.service static debug-shell.service disabled dirsrv@.service enabled . .
# display the list of services which are running
[root@testos]# systemctl -t service UNIT LOAD ACTIVE SUB DESCRIPTION abrt-ccpp.service loaded active exited Install ABRT coredump hook abrt-oops.service loaded active running ABRT kernel log watcher abrtd.service loaded active running ABRT Automated Bug Reporting Tool atd.service loaded active running Job spooling tools certmonger.service loaded active running Certificate monitoring and PKI enrollment containerd.service loaded active running containerd container runtime crond.service loaded active running Command Scheduler dbus.service loaded active running D-Bus System Message Bus dirsrv@MTNIRANCELL-IR.service loaded active running 389 Directory Server MTNIRANCELL-IR. docker.service loaded active running Docker Application Container Engine getty@tty1.service loaded active running Getty on tty1 gssproxy.service loaded active running GSSAPI Proxy Daemon httpd.service loaded active running The Apache HTTP Server ipa-custodia.service loaded active running IPA Custodia Service ipa.service loaded active exited Identity, Policy, Audit irqbalance.service loaded active running irqbalance daemon kadmin.service loaded active running Kerberos 5 Password-changing and Administration kmod-static-nodes.service loaded active exited Create list of required static device nodes for the current kernel krb5kdc.service loaded active running Kerberos 5 KDC libstoragemgmt.service loaded active running libstoragemgmt plug-in server daemon lvm2-lvmetad.service loaded active running LVM2 metadata daemon lvm2-monitor.service loaded active exited Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling lvm2-pvscan@8:16.service loaded active exited LVM2 PV scan on device 8:16 lvm2-pvscan@8:2.service loaded active exited LVM2 PV scan on device 8:2 network.service loaded active exited LSB: Bring up/down networking ntpd.service loaded active running Network Time Service oddjobd.service loaded active running privileged operations for unprivileged applications pki-tomcatd@pki-tomcat.service loaded active running PKI Tomcat Server pki-tomcat polkit.service loaded active running Authorization Manager postfix.service loaded active running Postfix Mail Transport Agent . .
### Start/Stop/status/restart/enable/disable a service:
[root@testos]# systemctl stop httpd
[root@testos]# systemctl start httpd
[root@testos]# systemctl restart httpd
[root@testos]# systemctl status httpd
● httpd.service - The Apache HTTP Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/httpd.service.d
└─ipa.conf
Active: active (running) since Wed 2022-11-30 15:47:20 +0330; 6s ago
Docs: man:httpd(8)
man:apachectl(8)
Process: 1603 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=0/SUCCESS)
Process: 1615 ExecStartPre=/usr/libexec/ipa/ipa-httpd-kdcproxy (code=exited, status=0/SUCCESS)
Main PID: 1620 (httpd)
Status: "Processing requests..."
Tasks: 60
Memory: 430.9M
CGroup: /system.slice/httpd.service
├─1620 /usr/sbin/httpd -DFOREGROUND
├─1622 /usr/libexec/nss_pcache 98364 off
├─1625 (wsgi:kdcproxy) -DFOREGROUND
├─1626 (wsgi:kdcproxy) -DFOREGROUND
├─1627 (wsgi:ipa) -DFOREGROUND
├─1628 (wsgi:ipa) -DFOREGROUND
├─1629 (wsgi:ipa) -DFOREGROUND
├─1630 (wsgi:ipa) -DFOREGROUND
├─1631 /usr/sbin/httpd -DFOREGROUND
├─1632 /usr/sbin/httpd -DFOREGROUND
├─1633 /usr/sbin/httpd -DFOREGROUND
├─1634 /usr/sbin/httpd -DFOREGROUND
└─1635 /usr/sbin/httpd -DFOREGROUND
Nov 30 15:47:19 rhel7-67130 systemd[1]: Starting The Apache HTTP Server...
Nov 30 15:47:20 rhel7-67130 ipa-httpd-kdcproxy[1615]: ipa: INFO: KDC proxy enabled
Nov 30 15:47:20 rhel7-67130 ipa-httpd-kdcproxy[1615]: ipa-httpd-kdcproxy: INFO KDC proxy enabled
Nov 30 15:47:20 rhel7-67130 systemd[1]: Started The Apache HTTP Server.
[root@testos]# systemctl disable httpd
Removed symlink /etc/systemd/system/multi-user.target.wants/httpd.service.
[root@testos]# systemctl enable httpd
Created symlink from /etc/systemd/system/multi-user.target.wants/httpd.service to /usr/lib/systemd/system/httpd.service.
### There are some SysV services yet. Those are controlled by chkconfig like below:
[root@testos]# chkconfig --list
Note: This output shows SysV services only and does not include native
systemd services. SysV configuration data might be overridden by native
systemd configuration.
If you want to list systemd services use 'systemctl list-unit-files'.
To see services enabled on particular target use
'systemctl list-dependencies [target]'.
netconsole 0:off 1:off 2:off 3:off 4:off 5:off 6:off
network 0:off 1:off 2:on 3:on 4:on 5:on 6:off
rhnsd 0:off 1:off 2:on 3:on 4:on 5:on 6:off