RHCSA RHEL 8 - Configure hostname resolution
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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
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