Linux Patch Management: Keeping Linux Systems Up To Date
- ICMP (Internet Control Message Protocol)
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A protocol for sending online error control messages. Associated with the ping command.
- ifconfig
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The ifconfig command is used to configure and display network devices.
- init
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The init process is the first Linux process called by the kernel. This process starts other processes that compose a working Linux system, including the shell.
- Initial RAM Disk
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RHEL uses an initial RAM disk in the boot process; it's stored as an initrd-`uname -r`.img file in the /boot directory. You can create your own from the currently booted kernel with the mkinitrd initrd-`uname -r`.img `uname -r` command.
- Internet Print Protocol (IPP)
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The Internet Print Protocol (IPP) is the evolving standard for printers shared over networks. It's being adapted by all major operating systems; the Linux implementation is CUPS.
- IP forwarding
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IP forwarding is when data is forwarded between computers or networks through your computer.
- iptables
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The iptables command is the basic command for firewalls and masquerading.
- IPv4, IPv6
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IPv4 and IPv6 are different systems of IP addressing. Version 4 is what we use today and is based on 32-bit addresses; version 6 is coming on line and is based on 128-bit addresses.
- iSCSI (Internet SCSI)
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Internet SCSI is a network protocol standard, associated with SCSI-3 specifications on network storage devices.
- KDE
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A GUI for Linux and Unix computers. Also known as the K Desktop Environment.
- Kdump
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The Kdump service allows you to configure what happens in the event of a kernel crash. You can dedicate a specific amount of RAM to the process, which is then unavailable for other processes.
- kernel
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The kernel is the heart of any operating system. It loads device drivers. You can recompile a Linux kernel for additional drivers, for faster loading and to minimize the required memory.
- kernel module
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Kernel modules are pluggable drivers that can be loaded and unloaded into the kernel as needed. Some loaded kernel modules are shown with the lsmod command.
- Kickstart
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Kickstart is the Red Hat automated installation system that allows you to supply the answers required during the installation process. When properly configured, a kickstart floppy can allow you to start your computer and install RHEL automatically from a network source.
- LDP (Linux Documentation Project)
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The LDP is a global effort to produce reliable documentation for all aspects of the Linux operating system. Its work is available online at www.tldp.org.
- lftp
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The lftp command starts a slightly more flexible FTP command line client.
- Lightweight Directory Access Protocol (LDAP)
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The Lightweight Directory Access Protocol allows you to keep authentication information on a central server on your network.
- locate
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The locate command searches through a default database of files and directories. The database is refreshed daily with the mlocate.cron script in the /etc/ cron.daily/ directory.
- logrotate
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The logrotate command utility allows you to maintain log files. By default, RHEL uses the cron daemon to rotate, compress, and remove various log files.
- lpc
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You can use the lpc command to scan all configured print devices and queues.
- lpq
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You can use the lpq command to view print jobs still in progress.
- lpr
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You can use the lpr command to send print requests.
- lprm
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You can use the lprm command to remove print jobs from the queue.
- logical extent (LE)
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A logical extent (LE) chunk of disk space that corresponds to a physical extent (PE).
- logical volume (LV)
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A logical volume (LV) is composed of a group of logical extents (LEs).
- Logical Volume Management (LVM)
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Logical Volume Management (LVM) allows you to set up a filesystem on multiple partitions. Also known as the Logical Volume Manager.
- lsattr
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The lsattr command lists file attributes.
- lvcreate
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The lvcreate command creates a logical volume (LV) from a specified number of available physical extents (PEs).
- lvdisplay
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The lvdisplay command specifies current configuration information for logical volumes (LVs).
- lvextend
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The lvextend command allows you to increase the physical volume (PV) area allocated to a logical volume (LV).
- lvremove
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Functionally opposite to the lvcreate command.