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COP 4343 Unix System Administration

COP 4343 Unix System Administration. Unit 3: Run levels Installing software Modifying kernel. Run Levels. Linux Initialization Process. Service configuration. /etc/rc3.d or /etc/rc5.d scripts starting with S to start service scripts starting with K to stop service /etc/init.d

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COP 4343 Unix System Administration

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  1. COP 4343Unix System Administration Unit 3: Run levels Installing software Modifying kernel

  2. Run Levels

  3. Linux Initialization Process

  4. Service configuration • /etc/rc3.d or /etc/rc5.d • scripts starting with S to start service • scripts starting with K to stop service • /etc/init.d • chkconfig • add service • turn service on/off in run level • service • start/stop/restart utility

  5. Changing run level • init • Command to change run level • halt, reboot • shutdown • with delay and message to uses

  6. Installing software • yum • via rpm command • install, update and query options • tarball • collection of files in compressed tar archive • use tar xvf command to extract • check /usr/share/doc directory • read INSTALL or README files

  7. The Linux Kernel • released by Linus Torvalds in source code • ftp.kernel.org • current release number: 2.6.16 • obtain and prepare kernel source code • mirror.cs.fiu.edu/pub/mirrors/fedora/5/i386/os/RELEASE-NOTES • www.mjmwired.net/resources/mjm-fedora-fc5.html#kernelsrc

  8. Linux Kernel components • Linux executable • bzImage or vmlinuz • Modules • kernel code that can be loaded/unloaded • stored in /lib/modules • module utilities • lsmod • insmod, modprobe • rmmod

  9. Kernel customization • customize kernel options • make xconfig • may require qt-devel package • make menuconfig • compile kernel • make bzImage • make modules • install • make modules_install • make install • check boot loader configuration • install on boot sector: grub-install

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