Linux Learning Diary-linux Foundation

Suggestions for Beginners:

Shutting down the firewall

1: Close the iptables:

# chkconfig iptables off

2: Close the Sellinux:

Double-click the mouse to open:/etc/sysconfig/selinux file

Modify "selinux=disabled"

After saving, exit and restart the system.

Inittab configuration file:

• /etc/inittaab Configuring the default run level

• /etc/sysconfig/init control the number of open TTY terminals, terminal color scheme

• /etc/init/rcs.conf loading the Rc.sysinit script to complete the system initialization task

• /etc/init/rc.conf compatible scripts, with run-level call handling

• /etc/init/rcs-sulogin.conf starting the/sbin/sushell environment for single-user mode

• Ctrl+alt+del Hotkey operation under the/etc/init/control-alt-delete.conf control terminal

• /etc/init/start-ttys.conf Configure the number of TTY terminal turns on, device files

• . etc/init/tty.conf control the opening of the TTY terminal

id:runlevels:action:proccess

That

tag: Run Level: Action type: Program or script

Command explanation:

(1): id--tag field with 1~4 characters to distinguish the configuration from other lines

(2): runlevels--Run Level field, which specifies which runlevel the record runs in

• 0: Shutdown state, the host will be turned off when using this level

• 1: Single user mode, no password Authentication required to log in system, more for system maintenance

• 2: Multi-user mode for character interface (network access not supported)

• 3: Full multi-user mode for character interface, most server hosts run at this level

• 4: Not assigned to use

• 5: Graphical interface for multi-user mode, providing a graphical desktop operating environment

• 6: Reboot, use this level is will reboot the host

(3) action--action Type field, which describes what kind of action the record will perform

(4) process--program or Script field to set the command that the startup process executes

System Service Control:

Service Name control type

/etc/rc.d/init.d/Service Name control type

Control type:
Start: Startup
STOP: Stop
Restart: restart
Reload: Reload
Status: View service status

To view the run level:
Use the RunLevel command to display, respectively, the runlevel before switching, the current RunLevel

To temporarily switch the run level:
Using the init command to combine 0-6 run-level parameters

[[email protected] ~]# runlevel//View system level
N 5//The first character is n indicates a previous switch-over level
[[Email protected] ~]# init 3//Modify system level to 3
[Email protected] ~]# RunLevel
5 3
[[Email protected] ~]# init 6//Restart system
[[Email protected] ~]# init 0//Shutdown system

System Services Administration Tools:

NTSYSV Tools
Provides an interactive, visual window
Can be run at the character terminal to facilitate centralized management of multiple services

              command: NTSYSV
                     ntsysv --level  Level list 650) this.width=650; "Name=" image_operate_39251463391052842 "src=" http://s16.sinaimg.cn/ mw690/006ggi6wgy71jjrobyt1f&690 "width=" 690 "height=" 381 "alt=" 006ggi6wgy71jjrobyt1f&690 "/>

   chkconfig tools:
                            does not provide interactive, Visual Window
                            Manage individual services more efficiently

to view the Startup status command for system services: chkconfig--list
Chkconfig--list Service Name

Service Script location:/etc/init.d/etc/rc.d/init.d

Case:

[email protected] ~]# chkconfig--list Network
Network 0: Off 1: Off 2: Enable 3: Enable 4: Enable 5: Enable 6: Off
[Email protected] ~]#chkconfig--list
NetworkManager 0: Off 1: Off 2: Off 3: Off 4: off 5: off 6: Off
Abrt–ccpp 0: Off 1: Off 2: Off 3: Enable 4: Off 5: Enable 6: Off
ABRTD 0: Off 1: Off 2: Off 3: Enable 4: Off 5: Enable 6: Off
Acpid 0: Off 1: Off 2: Off 3: Enable 4: Enable 5: Enable 6: Off
......

To set the system service startup status:

chkconfig--level Level list service name On|off

Case:

[Email protected] ~]# chkconfig--level 2345 Network on
[Email protected] ~]# chkconfig--list Network
Network 0: Off 1: Off 2: Enable 3: Enable 4: Enable 5: Enable 6: Off

This article is from the "Dark Cloud Technology" blog, please be sure to keep this source http://wuyunkeji.blog.51cto.com/12028005/1866066

Linux Learning Diary-linux Basics