Free web hosts - 314 Part II . Getting Around in Linux
314 Part II . Getting Around in Linux 28. Generate the header file named /boot/kernel.h. 29. Create the symbolic links for /boot/System.map-kernel_version. 30. Dump the boot information gathered in to /var/log/dmesg. Once inithas processed the rc.sysinit script, it will execute any other processes configured to run at boot and then enter the default runlevel. The runlevel is entered by running the /etc/rc.d/rcscript with a parameter of the runlevel. For example, to enter runlevel 3, initwould execute the following: /etc/rc.d/rc 3 The /etc/rc.d/rc script then goes to the correct runlevel directory, in this example /etc/rc.d/rc3.d, and runs the specified script files. In runlevels 2, 3, and 5 the final script to run is S99local, which is a link to /etc/rc.d/rc.local. This script runs last and is used to do any tasks that don t really need a separate script in init.d. The default script performs the following tasks. 1. Gather system information in to several variables. 2. Create the /etc/issue file. 3. Create the /etc/issue.net file. The /etc/issue file is displayed when a user logs in to the local console. For example: Red Hat Linux release 6.2 (Zoot) Kernel 2.2.16-3 on an i686 The /etc/issue.net file is displayed when a user logs in remotely over the network. By default it is just a copy of the /etc/issuefile. Making a new version of this file that does not give out as much useful information to those who may want to break in to your system is a common practice. In the If you make a new /etc/issue.net file, remember that it will be overwritten Real World when the system is rebooted unless you modify the /etc/rc.d/rc.local script. Red Hat provides a couple of tools to help manage the runlevel directories, without having to manually make link file changes. The first is a quick tool known as chkconfig. It takes its directives from the command line. The supported parameters are shown in Table 8-10. For example, to see which runlevels the inet service is started in, you would use the following: [root@redhat rc.d]# chkconfig –list inet inet 0:off 1:off 2:off 3:on 4:on 5:on 6:off
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