RHCSA Linux System Administration Flashcards

Which command creates a physical volume on /dev/sdc for use with LVM?

Answer: pvcreate /dev/sdc

pvcreate initializes a block device as an LVM physical volume by writing the PV metadata.

How do you configure a NetworkManager connection to use the static IP 192.168.1.50/24 with gateway 192.168.1.1?

Answer: nmcli con mod eth0 ipv4.addresses 192.168.1.50/24 ipv4.gateway 192.168.1.1 ipv4.method manual

nmcli con mod modifies an existing connection profile; ipv4.method manual disables DHCP and applies the static address.

Which directive in /etc/ssh/sshd_config disables root login over SSH?

Answer: PermitRootLogin no

PermitRootLogin no is the standard sshd_config directive that prevents root from authenticating via SSH.

A script needs to run as root at reboot via cron. Which crontab time field triggers this?

Answer: @reboot

@reboot is a cron shorthand that runs the command once when the cron daemon starts, typically at system boot.

Which command shows the SELinux boolean 'httpd_can_network_connect' and its current value?

Answer: getsebool httpd_can_network_connect

getsebool prints the current on/off state of one or more SELinux booleans.

What command archives /etc into /backup/etc.tar.gz while preserving permissions?

Answer: tar -czpf /backup/etc.tar.gz /etc

The -p flag tells tar to preserve file permissions and ownership in the archive.

Which command sets the default systemd boot target to multi-user (non-graphical) mode permanently?

Answer: systemctl set-default multi-user.target

set-default creates a symlink from /etc/systemd/system/default.target to multi-user.target, persisting across reboots.