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Linux Process Management
How to see list of Processes running ?
[kloudway@ ~]$ps -ef
UID PID PPID C STIME TTY TIME CMD
root 2 0 0 13:00 ? 00:00:00 [kthreadd]
root 4 2 0 13:00 ? 00:00:00 [kworker/0:0H]
root 5 2 0 13:00 ? 00:00:00 [kworker/u30:0]
root 6 2 0 13:00 ? 00:00:00 [mm_percpu_wq]
root 7 2 0 13:00 ? 00:00:00 [ksoftirqd/0]
root 8 2 0 13:00 ? 00:00:00 [rcu_sched]
root 9 2 0 13:00 ? 00:00:00 [rcu_bh]
root 10 2 0 13:00 ? 00:00:00 [migration/0]
How to kill a process?
[kloudway@ ~]$kill 432 #Here 432 is the Process ID
[kloudway@ ~]$How to see List of Top Processes consuming more Computing Resources
[kloudway@ ~]$ top
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 20 0 125568 5328 3892 S 0.0 0.5 0:01.74 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
4 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker/0:0H
5 root 20 0 0 0 0 I 0.0 0.0 0:00.04 kworker/u30:0
6 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 mm_percpu_wq
7 root 20 0 0 0 0 S 0.0 0.0 0:00.11 ksoftirqd/0
8 root 20 0 0 0 0 I 0.0 0.0 0:00.17 rcu_sched
9 root 20 0 0 0 0 I 0.0 0.0 0:00.00 rcu_bh
10 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0How to see Linux Process State - Sleep(s), Running(R),, Zombie(Z)
[kloudway@ ~]$ps aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.5 125568 5328 ? Ss 13:00 0:01 /usr/lib/systemd/systemd --swit
root 2 0.0 0.0 0 0 ? S 13:00 0:00 [kthreadd]
root 4 0.0 0.0 0 0 ? I< 13:00 0:00 [kworker/0:0H]
root 5 0.0 0.0 0 0 ? I 13:00 0:00 [kworker/u30:0]
root 6 0.0 0.0 0 0 ? I< 13:00 0:00 [mm_percpu_wq]
root 7 0.0 0.0 0 0 ? S 13:00 0:00 [ksoftirqd/0]
root 8 0.0 0.0 0 0 ? I 13:00 0:00 [rcu_sched]
What is Service?
- A Process which is running continuously on the system is called as service. Service program usually start at booting time and ends only at server shutdown time.
- Service is the responsible process to serve certain services to the client applications.
- Service process can be controlled using 'service or systemctl' command.
- It is possible to start/stop/restart a service during the session as per the requirements.
- service is also called as daemon.
Examples: httpd, vsftpd, sshd etc...
What is chkconfig?
- chkconfig is the command to control the service startup behavior at the time of system boot time.
- Its possible to control weather the service needs to be started or not at the time of system boot using chkconfig
Commands used to control a service:
Syntax:
- #service <name of the service> status --- To check the status of the service
- #service <name of the service> start --- To start the service
- #service <name of the service > stop --- To stop a service
- #service <name of the service> reload --- To reload the service
- #service <name of the service> restart --- To restart the service
Examples:
- service sshd status
- service sshd start
- service sshd stop
- service sshd reload
- service sshd restart
How to use chkconfig?
Syntax:
- #chkconfig - -list --- To check the availability of service
- #chkconfig <service> on --- To make the service available after restart
- #chkconfig <service> off --- To make the service unavailable after restart
Examples:
- #chkconfig --list
- #chkconfig htpd on
- #chkconfig httpd off
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