SUSE sca_sles15 - SUSE Certified Administrator in Enterprise Linux 15

To add additional physical volumes to an existing volume group, use the vgextend command. The vgextend command increases a volume group's capacity by adding one or more free physical volumes.

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/4/html/cluster_logical_volume_manager/vg_grow#:~:text=To%20add%20additional%20physical%20volumes,or%20more%20free%20phys ical%20volumes.

The command that is used to add new physical volumes to an existing volume group is vgextend. This command will extend a volume group by adding one or more physical volumes to it. The physical volumes must be initialized with pvcreate before they can be added to a volume group. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-lvm-vgs.html#sec-lvm-vgs-add-pv

The /etc/fstab file contains information about file systems that need to be mounted at boot time or on demand. It specifies the device name, mount point, file system type, mount options, dump frequency, and fsck order for each file system. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-storage-mounting.html#sec-storage-mounting-fstab

The name of the system logging facility in SUSE Linux Enterprise is syslog-ng. It is a flexible and scalable implementation of the syslog protocol that can handle various types of log messages from different sources and destinations. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-syslog.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

Save a File in Vim / Vi #The command to save a file in Vim is :w.

To save the file without exiting the editor, switch back to normal mode by pressing Esc, type :w and hit Enter.

https://linuxize.com/post/how-to-save-file-in-vim-quit-editor/

The w command will save the current file without exiting Vim. It stands for write. The other commands are either invalid or will exit Vim after saving. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/cha-vim.html#sec-vim-save

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 statement that is true regarding VFS is that VFS is an abstraction layer in the kernel that provides the same interface to applications and users regardless of which file system format is used. VFS stands for Virtual File System or Virtual File System Switch. It allows different types of file systems (such as ext4, xfs, nfs, etc.) to be accessed through a common set of system calls and functions. VFS also provides caching and buffering mechanisms to improveperformance and reliability. References: https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-vfs.html

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

The command that you would run to create an updated initial file system, if your server hardware requires additional drivers to be available for the kernel at boot up, is mkinitrd. This command will create or update the initrd file in /boot based on the current kernel and configuration files. 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. References:https://documentation.suse.com/sles/15-SP3/html/SLES-all/sec-boot-initrd.html