Use the seq(1) command to loop over nslookup in the init container.

[roehrich-hpe]

Switch to using seq(1), which works with sh(1).

[roehrich-hpe]

Here's the loop in action:

: dean-mbp; kubectl logs violet-launcher-vqp9p -f -c mpi-wait-for-worker-0
contacting violet-worker-0.violet-worker.default.svc...
attempt 1 of 100...
Server:		10.96.0.10
Address:	10.96.0.10#53

** server can't find violet-worker-0.violet-worker.default.svc: NXDOMAIN

attempt 2 of 100...
Server:		10.96.0.10
Address:	10.96.0.10#53

** server can't find violet-worker-0.violet-worker.default.svc: NXDOMAIN

attempt 3 of 100...
Server:		10.96.0.10
Address:	10.96.0.10#53

** server can't find violet-worker-0.violet-worker.default.svc: NXDOMAIN

attempt 4 of 100...
Server:		10.96.0.10
Address:	10.96.0.10#53

Name:	violet-worker-0.violet-worker.default.svc.cluster.local
Address: 10.244.3.5

successfully contacted violet-worker-0.violet-worker.default.svc; done