How to fix FAILED - RETRYING: Wait for the ServiceMonitor CRD to be created

Error - FAILED - RETRYING: Wait for the ServiceMonitor CRD to be created on AWS EC2

I was installing Openshift(OKD) Version 3.11 on Cent0S 7.6 with one master and 1 node configuration on the AWS EC2 instance. I have faced this error FAILED - RETRYING: Wait for the ServiceMonitor CRD so many times during installation. 

First of all, check the status of SDN pods by using below command

oc get pods -n openshift-sdn

The output of the above command is

NAME        READY     STATUS             RESTARTS   AGE

ovs-k85zh   1/1       Running                            0               1h

sdn-ds457   0/1       CrashLoopBackOff          16             1h

Now check the logs of the sdn pod

oc logs sdn-ds457 -n openshift-sdn

Once you entered the above command it will show output like this

From the logs it is clear that our subnet doest not match with node ip i.e there is a problem in DNS configuration. In my case, I did 2 following changes in my configuration

1. Add your public IP of the master node in /etc/resolv.conf like this

nameserver 172.31.7.2(my private ip which is already present)

nameserver 18.239.xx.xxx

2. Add details of your master and nodes in /etc/hosts file
public ip of master   hostname of master
public ip of node      hostname of node
private ip of master  hostname of master
private ip of node     hostname of node

3. Make sure that docker service is running.