Start a pod with psql installed for connecting to a postgres instance:

1$ k run -n postgres -it --rm psql-client --image=postgres --restart=Never -- bash
2$ psql -h "postgres.posgres.svc.cluster.local" -U "admin" -d "db"

Start a pod with redis-cli installed for connecting to a redis instance:

1# Start a redis container
2$ kubectl run -n redis --rm -it --image=redis redis-cli -- bash
3$ redis-cli -h redis.redis.svc.cluster.local -p 6379