sca_sles15 SUSE Certified Administrator in Enterprise Linux 15 Question and Answers

If you have a service named tftp, the command and options that would enable tftp to start automatically when the server starts are systemctl enable tftp. This command will create symbolic links in the appropriate systemd target directories to enable the tftp service unit. To start the service immediately, you can also use systemctl start tftp or systemctl enable --now tftp. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-systemd-services.html#sec-systemd-enable

You have just added a new directory to be exported via NFS. To make that directory available, you should run systemctl restart nfsserver.service. This command will restart the NFS server service and reload the /etc/exports file that contains the export definitions. References: https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-nfs-server.html#sec-nfs-server-export

The scripts in the /etc/grub.d directory are used to generate the /boot/grub2/grub.cfg file and are taken as input by the grub2-mkconfig command. The /boot/grub2/grub.cfg file contains the menu entries and settings for the GRUB2 boot loader. The grub2-mkconfig command is used to create or update this file based on the scripts in /etc/grub.d and other configuration files. The scripts in /etc/grub.d are executed in numerical order and can be customized by the user or administrator. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-grub2-config.html#sec-grub2-config-files

The file that contains the list of DNS servers SLES will contact is /etc/resolv.conf. This file specifies one or more nameserver addresses that will be used to resolve hostnames to IP addresses. It may also contain other options such as search domains, sort lists, etc. The /etc/resolv.conf file can be generated automatically by network configuration tools or edited manually by the administrator. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-network-dns.html#sec-network-dns-resolv.conf

The command that will display the value of a variable named TMPDIR is echoTMPDIR.Theechocommandwillprintitsargumentstothestandardoutput.Thesign is used to reference the value of a variable in bash. If you omit the $ sign, echo will print the name of the variable instead of its value. If you use single quotes around the variable name, echo will also print the name instead of its value. If you use double quotes around the variable name, echo will print its value as expected. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-bash.html#sec-bash-variables

The file that contains information about secondary groups on the system is /etc/group. This file defines the group names, group IDs, group passwords, and group members for each group on the system. The primary group information for each user is stored in /etc/passwd file. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-user-group.html#sec-user-group-files

It is false that it is not possible to open more than one file in Vim without running a second instance. Vim supports multiple buffers, windows, and tabs that allow you to work with multiple files within one Vim session. You can use various commands and options to open, switch, split, close, and manipulate files in different ways. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-vim.html#sec-vim-multiple-files

The command that is used to manage software RAID is mdadm. This command can be used to create, assemble, monitor, and manage multiple device (md) arrays that provide RAID functionality. It can also be used to query and modify various parameters and settings of md arrays. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-raid.html#sec-raid-mdadm

The command that you would use to set an Extended ACL so that the jsmith user has all permissions to just the tstparse.sh file in your scripts subdirectory under your home directory is setfacl -m u:jsmith:rwx ~/scripts/tstparse.sh. This command will modify (or create if it does not exist) the Extended ACL for the specified file and add an entry for the jsmith user with read, write, and execute permissions. You can use getfacl ~/scripts/tstparse.sh to view the Extended ACL for the file. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-acl.html#sec-acl-set

The program systemd is the process with process ID 1. It is responsible for initializing the system in the required way. systemd is started directly by the kernel and resists signal 9, which normally terminates processes. All other programs are either started directly by systemd or by one of its child processes.

https://documentation.suse.com/sles/15-GA/html/SLES-all/cha-systemd.html

Systemd is the first process that is started by the kernel during boot. It has the process ID of 1. It is responsible for initializing and managing other processes and services on the system. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-systemd-basics.html#sec-systemd-intro

By default, the VNC Client and the VNC server daemon use a self-signed SSL certificate for secure communications. The VNC server generates a self-signed certificate when it is started for the first time. The VNC Client will prompt the user to accept or reject the certificate when connecting to the server. Alternatively, the user can provide a custom certificate for the VNC server or disable encryption if desired. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-vnc-security.html

Log file rotation is the process of compressing or deleting old log files to save disk space and improve performance. The /etc/logrotate.conf file controls the global settings for log file rotation, such as frequency, size limit, compression method, etc. The /etc/logrotate.d/ directory contains configuration files for specific log files that can override the global settings in /etc/logrotate.conf. The /usr/sbin/logrotate program is used to perform log file rotation according to the configuration files. It is usually invoked by a cron job in /etc/cron.daily/logrotate. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-logrotate.html

The command that is used to ensure an ext3 file system is checked every 50 times it is mounted is tune2fs. The tune2fs command can be used to adjust various parameters of an ext2, ext3, or ext4 file system. The -c option can be used to set the maximum number of mounts between two file system checks. For example, tune2fs -c 50 /dev/sda1 will set the check interval to 50 mounts for /dev/sda1. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-tune2fs.html

The initrd file is an initial ramdisk image that contains the necessary drivers and tools to mount the root file system and start the boot process. It is usually located in the /boot directory along with the kernel image (vmlinuz). References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-boot-initrd.html

The openSUSE Leap version of Linux is designed for desktop power users and developers. It is a community-driven distribution that offers a stable and reliable operating system with cutting-edge software and tools. It is suitable for personal use, development, testing, and experimentation. It is not intended for high-availability or data center environments that require enterprise-level support and security. References:https://en.opensuse.org/Portal:Leap

The command that will take a foreground process and suspend it, and then place it in the background as a stopped job is Ctrl+Z. This keyboard shortcut will send a SIGTSTP signal to the foreground process group, which will stop its execution and return control to the shell. The shell will then display the job number and status of the stopped process. To resume the process in the background, you can use the bg command with the job number or % sign. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-cli-jobs.html

You can view manual pages by running the man command followed by a specific command name. If the man command is not installed on your system, install it by runningzypper install man.

https://documentation.suse.com/sles/15-GA/html/SLES-all/pre-sle.html

The command that is used to view the manual pages is man. The man command will display the formatted documentation for a given command, function, or file. The manual pages are organized into sections based on their type and purpose. The user can specify the section number and the name of the item to view its manual page. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-cli-help.html#sec-cli-help-man

If you want to define alias commands so that each time you open a terminal window those aliases are available from the command prompt, you should create a file named -/.alias and put your alias commands in that file. The -/.alias file is one of the files that are sourced by the bash shell when it starts. It can contain alias definitions and other customizations for your shellenvironment. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-bash.html#sec-bash-startup