Installation and service management of Linux

1. Red Hat 6.5 steps to turn off the firewall:

(1). Close Iptables:chkconfig

Iptables off

(2). Close SELINUX, double-click Open, Etc/stsconfig/selinux file, modify "Selinux=disabled", save exit.

(3). Restart

2.linux boot process: post---MBR boot----GRUB MENU----Load the Linux kernel----init process initialization .

Meaning and purpose of the 3.linux operation level:

(1: Single user mode, no user name and password to log in, 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: Multi-user mode of graphical interface, providing a graphical desktop operating environment)

(6: Restart)

(0: Shutdown status)

The role of each field in the 4.inittab file;

1. ) ID---tag field to differentiate the configuration of other rows

2.) runlevels------runlevel field, Linux works together to meet different functional requirements by combining different system services

3.) Action--------Action Type field, which describes the action category for the row configuration, Initdefault indicates "default entry to run level after setting initialization system"

4.) process------Program or script field for actual operation

5. Methods to control the specified system services;

1. )Service Name control type
   

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

6. Several common types of control:

*start-------Start up

*stop---------Stop

*restart---------Restart

*reload------Overloading

*status-----View Status

7. View the RunLevel RunLevel (the first column will show N if the run level was previously switched)

Switching the operating level of the system init RunLevel

8. Optimized boot load service can use NTSYSV tools and Chkconfig tools

Chkconfig--list View the default boot status for all services

Chkconfig--level Run-level service name On|off set the default startup state for the service

9. View the free memory grep "Memfree"/proc/meminfo

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Installation and service management of Linux