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AIX /etc/inittab文件

原创 Linux操作系统 作者:spider0283 时间:2012-05-11 09:20:52 0 删除 编辑

Introduction
The /etc/inittab file lists the processes that init starts, and it also specifies when to
start them. If this file gets corrupted, the system cannot boot properly. Because of this, it
is a good idea to keep a backup of this file. This file should never be edited directly. Use
lsitab, chitab, and mkitab commands. After editing the /etc/inittab file, force the
system to reread the file by using the telinit q command.
To list the inittab type: lsitab –a
To add an entry into the inittab type: mkitab [ -i Identifier ] { [
Identifier ] : [ RunLevel ] : [ Action ] : [ Command ] }
• Example: mkitab "tty002:2:respawn:/usr/sbin/getty /dev/tty2“
To chance an entry in the inittab type: chitab { [ Identifier ] : [ RunLevel
] : [ Action ] : [ Command ] }
• Example: chitab "tty002:4:respawn:/usr/sbin/getty /dev/tty“

Format of entries
The individual line entries in /etc/inittab contain the following fields:
• Id: Up to 14 characters that identify the process.
• Runlevel: Defines the run levels for which the process is valid. AIX uses run levels of
0-9. If the telinit command is used to change the run level, a SIGTERM signal is sent to
all processes that are not defined for the new run level. If, after 20 seconds, a process
has not terminated, a SIGKILL signal is sent. The default run level for the system is 2,
which is AIX multiuser mode.
• Action: How to treat the process. Valid actions are:
- respawn: If the process does not exist, start it. If the process dies then restart it.
- wait: Start the process and wait for it to finish before reading the next line.
- once: Start the process and immediately read the next line. Do not restart it if it
stops.
- sysinit: Commands to be run before trying to access the console
- off: Do not run the command.
- Command. Use the AIX command to run to start the process.
Run levels
AIX uses a default run level of 2. This is the normal multi-user mode. You may want to
perform. maintenance on your system without having other users logged in. The
command shutdown -m places your machine into a single user mode terminating all
logins. Once the machine reaches the single user mode, you are prompted to enter the
root password. When you are ready to return to normal mode, type telinit 2.

inittab.JPG

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