LPI Linux Certification in a Nutshell (In a Nutshell (O'Reilly))
Format: PDF / Kindle (mobi) / ePub
Linux deployment continues to increase, and so does the demand for qualified and certified Linux system administrators. If you're seeking a job-based certification from the Linux Professional Institute (LPI), this updated guide will help you prepare for the technically challenging LPIC Level 1 Exams 101 and 102.
The third edition of this book is a meticulously researched reference to these exams, written by trainers who work closely with LPI. You'll find an overview of each exam, a summary of the core skills you need, review questions and exercises, as well as a study guide, a practice test, and hints to help you focus.
Major topics include:
- Critical GNU and Unix commands
- Linux installation and package management
- Devices and filesystems
- Text editing, processing, and printing
- The X Window System
- Networking and security
- Mail transfer agents
- Email, FTP, and web services
These exams are for junior to mid-level Linux administrators with about two years of practical system administration experience. You should be comfortable with Linux at the command line and capable of performing simple tasks, including system installation and troubleshooting.
immediately: # init 6 Go to single-user mode immediately: # init 1 or: # init s telinit The telinit command may be used in place of init. telinit is simply a link to init, and the two may be used interchangeably. System shutdown with shutdown When shutdown is initiated, all users who are logged into terminal sessions are notified that the system is going down. In addition, further logins are blocked to prevent new users from entering the system as it is being shut down. Chapter 4: Change
mounting is called a mount point. You must create the directories that you will use for mount points if they do not already exist. During system startup, these directories and mount points may be managed through the /etc/fstab file, which contains the information about filesystems to mount when the system boots and the directories that are to be mounted. Superblock A superblock is a block on each filesystem that contains metadata information about the filesystem layout. The information contained
Chapter 5: Linux Installation and Package Management (Topic 102) | 57 www.it-ebooks.info Installation/Package Management Example 5 rpm Verify mode Files from installed packages can be compared against their expected configuration from the RPM database by using rpm -V. Frequently used verify options --nofiles Ignores missing files. --nomd5 Ignores MD5 checksum errors. --nopgp Ignores PGP checking errors. On the Exam Make certain that you are aware of rpm’s major operational modes and their
is compared to this value by the kernel and e2fsck -p, much like the maximum mount count. A value of 0 disables this check. -L label Sets the volume label of the filesystem to label. The volume label can also be set with the e2label command. -j Adds an ext3 journal file to the filesystem and sets the has_journal feature flag. Sets the reserved block percentage to n. By default, ext2 filesystems reserve 5 percent of the total number of available blocks for the root user. This means that if a
USB modules, and configuring USB devices. USB Topology USB devices are attached to a host in a tree through some number of hub devices. The lsusb command can be used to see how devices are physically attached to a Linux system. # lsusb -t Bus# 4 '-Dev# 1 Bus# 3 '-Dev# 1 |-Dev# '-Dev# Bus# 2 '-Dev# 1 |-Dev# | |-Dev# | '-Dev# '-Dev# '-Dev# Bus# 1 '-Dev# 1 Vendor 0x0000 Product 0x0000 Vendor 0x0000 Product 0x0000 2 Vendor 0x046d Product 0xc501 3 Vendor 0x0781 Product 0x0002 Vendor 0x0000 Product