linux services and processes

Services:

1. Classification of linux services

1. RPM services: including independent services and xinetd services
       /etc/init.d Startup script location
      /etc/xinetd.config xineted configuration files
      /etc/xinetd.d/: based on xinetd services Startup script
      /var/lib/ : The data generated by the service is placed here
      /var /log/: log

2, the source code service
       is placed in the usr/local/ directory

3, chkconfig --list View the self-starting status of the
      service chkconfig service name on Set the service's self-start

4, view the connection
   netstat -ltun

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Process

1 , Process View
1, Introduction: A process refers to an executing one Program or command, each process is a running entity and has its own address space

2, view all processes in the system
   ps aux

   tty

3, top command
   The three main parameters
  load average load percentage 1 minute, 5 minutes, 15 minutes
  cpu(s): 87.53%id CPU idle ratio
  mem: 2024k free free memory

4, view the process tree
pstree