Check for used ports 443/80 - LB can't boot up - "Still waiting for the Kubernetes API"

[mschindl]

Following error occurs if the ports 443/80 are in use on the server,
which cause that the container openshift-4-loadbalancer-mschindl-ocp4 can't boot up.

Error:

[root@mschindl-hz1 ~]# tail -f  /root/hetzner-ocp4/ansible/../mschindl-ocp4/.openshift_install.log
time="2021-01-05T14:20:43+01:00" level=debug msg="OpenShift Installer 4.6.8"
time="2021-01-05T14:20:43+01:00" level=debug msg="Built from commit f5ba6239853f0904704c04d8b1c04c78172f1141"
time="2021-01-05T14:20:43+01:00" level=info msg="Waiting up to 20m0s for the Kubernetes API at https://api.mschindl-ocp4.srv1.redmarc.de:6443..."
time="2021-01-05T14:20:43+01:00" level=debug msg="Still waiting for the Kubernetes API: Get \"https://api.mschindl-ocp4.srv1.redmarc.de:6443/version?timeout=32s\": dial tcp 144.76.199.107:6443: connect: connection refused"

Check:

• open ports on server

[root@mschindl-hz1 ~]#  nmap -sT -O localhost 
Starting Nmap 7.70 ( https://nmap.org ) at 2021-01-05 16:06 CET
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00027s latency).
rDNS record for 127.0.0.1: localhost.localdomain
Not shown: 994 closed ports
PORT     STATE SERVICE
80/tcp   open  http
...
443/tcp  open  https
...

• container load balancer

[root@mschindl-hz1 ~]# podman logs openshift-4-loadbalancer-mschindl-ocp4
...

Third-party application blocked both ports on the server and was reconfigured/removed.

[rbo]

We can easily check with:

https://docs.ansible.com/ansible/latest/collections/community/general/listen_ports_facts_module.html