Your support on Ko-Fi is much appreciated:
Recommended RHCSA book:
📔 Amazon AU: https://amzn.to/2X5FL98
Buy CSG Merchandise:
More information on Sophos Home Antivirus:
More information about Hostinger VPS:
👉 http://bit.ly/H-VPS
Join our new discord channel:
👉 https://discord.gg/kBQ6Jry
This video is based on RHEL 8. Video to cover the section ‘Configure hostname resolution’ for the RHCSA (Red Hat Certified System Administrator).
More information on the required learning: http://bit.ly/rhcsa8
Notes from the video:
Hostnames
All machines in a network have in addition to an IP address, a hostname. The hostname is literally a name for the host.
To view the current hostname in short format:
# hostname -s
The view the fully qualified domain name (FQDN):
# hostname -f
To change the hostname edit the following file:
# vi /etc/hostname
To then force the update of the hostname run:
# hostnamectl
DNS
DNS or Domain Name Servers are special servers that provide resolution of a FQDN to an IP address. This allows to have the added benefit of not having to type in the IP address every time you want to connect to a network device.
To see the current configured DNS servers you can check the following file:
# cat /etc/resolv.conf
To add/update the DNS servers on an interface (this example eth0) run the following:
# nmcli con mod eth0 ipv4.dns "8.8.8.8 8.8.4.4"
To then force the read of this for configuration for DNS resolution run:
# nmcli con reload
# systemctl restart NetworkManager
To manually overwride what is configured on the DNS server with a local configuration you can edit the following file which acts as a local DNS server.
# vi /etc/hosts
An example entry would be:
172.28.18.3 RHEL8.local RHEL8
Computers, Security & Gadgets 