CentOS / RHEL: Check If A Service Is Running Or Not

How do I find out if a service such as MySQL or Apache running on my Centos/RHEL/Fedora Linux server? You need to use service command.

It runs a System V init script in as predictable environment as possible, removing most environment variables and with current working directory set to /. The syntax is as follows:

service SERVER status

OR

/etc/init.d/SERVER status

Examples

Find, out if a service called mysqld (MySQL server) is running on CentOS OR RHEL. Open a terminal or login using ssh, enter:

 

# service mysqld status

 

Sample outputs:

mysqld (pid  7556) is running…

Find out status of all services

The service –status-all command runs all init scripts, in alphabetical order, with the status command:

# service –status-all

 

Sample outputs:

….

…..

irqbalance (pid 2183) is running…

iscsi is stopped

iscsid is stopped

Kdump is operational

i5k_amb-isa-0000

Adapter: ISA adapter

Ch. 0 DIMM 0: +63.0°C  (low  = +127.5°C, high = +127.5°C)

Ch. 0 DIMM 1: +56.5°C  (low  = +127.5°C, high = +127.5°C)

Ch. 1 DIMM 0: +62.0°C  (low  = +127.5°C, high = +127.5°C)

Ch. 1 DIMM 1: +49.0°C  (low  = +127.5°C, high = +127.5°C)

Ch. 2 DIMM 0: +54.0°C  (low  = +127.5°C, high = +127.5°C)

Ch. 3 DIMM 0: +49.0°C  (low  = +127.5°C, high = +127.5°C)

 

coretemp-isa-0000

Adapter: ISA adapter

Core 0:      +37.0°C  (high = +78.0°C, crit = +100.0°C)

Core 1:      +38.0°C  (high = +78.0°C, crit = +100.0°C)

Core 2:      +34.0°C  (high = +78.0°C, crit = +100.0°C)

Core 3:      +38.0°C  (high = +78.0°C, crit = +100.0°C)

 

coretemp-isa-0001

Adapter: ISA adapter

Core 0:      +40.0°C  (high = +78.0°C, crit = +100.0°C)

Core 1:      +40.0°C  (high = +78.0°C, crit = +100.0°C)

Core 2:      +39.0°C  (high = +78.0°C, crit = +100.0°C)

Core 3:      +39.0°C  (high = +78.0°C, crit = +100.0°C)

 

w83627hf-isa-0290

Adapter: ISA adapter

in0:         +4.08 V  (min =  +0.00 V, max =  +4.08 V)

in1:         +4.08 V  (min =  +0.00 V, max =  +4.08 V)

in2:         +4.08 V  (min =  +2.82 V, max =  +3.79 V)   ALARM

in3:         +3.07 V  (min =  +4.08 V, max =  +4.05 V)   ALARM

in4:         +3.12 V  (min =  +4.08 V, max =  +4.08 V)   ALARM

in5:         +3.15 V  (min =  +4.08 V, max =  +4.06 V)   ALARM

in6:         +3.20 V  (min =  +4.08 V, max =  +4.06 V)   ALARM

in7:         +3.28 V  (min =  +3.82 V, max =  +4.06 V)   ALARM

in8:         +3.28 V  (min =  +4.06 V, max =  +4.06 V)   ALARM

fan1:          0 RPM  (min =    0 RPM, div = 2)

fan2:          0 RPM  (min =    0 RPM, div = 2)

fan3:          0 RPM  (min =    0 RPM, div = 2)

temp1:       -48.0°C  (high = +60.0°C, hyst = +55.0°C)  sensor = thermistor

temp2:       -48.0°C  (high = +80.0°C, hyst = +75.0°C)  sensor = thermistor

temp3:       -48.0°C  (high = +80.0°C, hyst = +75.0°C)  sensor = thermistor

cpu0_vid:   +1.419 V

beep_enable:enabled

 

lvmetad is stopped

mdmonitor is stopped

memcached (pid  45560) is running…

messagebus (pid  7066) is running…

mysqld (pid  7556) is running…

netconsole module not loaded

Configured devices:

lo eth0 eth1

Currently active devices:

lo eth0 eth1

rpc.svcgssd is stopped

rpc.mountd (pid 7199) is running…

nfsd (pid 7262 7261 7260 7259 7258 7257 7256 7255) is running…

rpc.rquotad (pid 7195) is running…

rpc.statd (pid  2215) is running…

ntpd (pid  7295) is running…

master (pid  7649) is running…

Process accounting is enabled.

ipmi_msghandler module not loaded.

ipmi_si module not loaded.

ipmi_devintf module not loaded.

/dev/ipmi0 does not exist.

quota_nld is stopped

rdisc is stopped

…..

..

ps or pgrep command

You can use ps or pgrep command as follows to find out if service is running or not on RHEL/Centos:

# ps aux | grep  serviceNameHere

# ps aux | grep  mysqld

 

OR

# pgrep serviceNameHere

match user name ##

# pgrep -u userName serviceNameHere

# pgrep mysqld

# pgrep -u mysql mysqld

Starting service

Say if a service called httpd is not running on server and you wish to start the same:

# service httpd status

if httpd is not running start it ##

# chkconfig httpd on

# service httpd start

References

For more information see man pages – service(8),pgrep(1),ps(1).

 

 

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