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Step 1: To view the existing list of DNS servers, check the resolv.conf file.
$ cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 8.8.8.8
Step 2: Check the reachability of the new DNS server by using the ping command.
$ ping -c 2 8.8.4.4
PING 8.8.4.4 (8.8.4.4) 56(84) bytes of data.
64 bytes from 8.8.4.4: icmp_seq=1 ttl=113 time=4.70 ms
64 bytes from 8.8.4.4: icmp_seq=2 ttl=113 time=4.50 ms
--- 8.8.4.4 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 4.497/4.597/4.697/0.100 ms
Note: The ping does not check port 53 specifically. It helps verify if the DNS server is reachable.
Step 3: Use the csadm hostname command with the --dns-name option to set the new DNS server globally for the FortiSOAR instance.
$ sudo csadm hostname --dns-name 8.8.4.4
Step 4: Verify the updated DNS information in the resolv.conf file.
$ cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 8.8.8.8
nameserver 8.8.4.4
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