Nomad executors are not starting in Jenkins. This was due to the DNS for
the Nomad URL in Jenkins which is configured to use
nomad.fdiopoc.net:4646 pointing to the wrong IP address.

; <<>> DiG 9.11.14-RedHat-9.11.14-2.fc30 <<>> nomad.fdiopoc.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22624
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;nomad.fdiopoc.net.        IN    A
;; ANSWER SECTION:
nomad.fdiopoc.net.    180    IN    A    157.230.67.179
;; Query time: 38 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Thu Oct 29 09:55:49 CDT 2020
;; MSG SIZE  rcvd: 62

We tried hard-coding the Nomad URL to the IP address 10.30.51.32:4646
and 10.39.51.33:4646. Unfortunately that is not resolving the issue.

We will continue to work with the community to resolve this issue as
quickly as possible.

Thank you,
Vanessa