How to replace the default admin user with a simple identity provider for an Openshift demo environment?

Steps

1. Move to a directory where you want to put the temp files.
   cd /home
2. Install the htpasswd command.
   yum install httpd-tools
3. Create some users and passwords. Note, the first command creates a password file and 2nd adds to it.
   htpasswd -c -B -b users.htpasswd ocpadmin 123456
   htpasswd -B -b users.htpasswd cpadmin 123456
4. Optionally, you can verify users with these commands:
   htpasswd -b -v users.htpasswd cpadmin 123456
   htpasswd -b -v users.htpasswd ocpadmin 123456
5. Create a secret to contain the htpasswd file.
   oc create secret generic htpass-secret --from-file=htpasswd=./users.htpasswd -n openshift-config
6. Create a CR file for the config change as mentioned in Configuring an HTPasswd identity provider. In this example, we use htpasswdCR.yaml.

   apiVersion: config.openshift.io/v1
   kind: OAuth
   metadata:
     name: cluster
   spec:
     identityProviders:
     - name: admins_htpasswd_provider 
       mappingMethod: claim 
       type: HTPasswd
       htpasswd:
         fileData:
           name: htpass-secret
7. Apply the yaml file with htpasswd identity provider settings.
   oc apply -f htpasswdCR.yaml
8. Log in with kubeadmin by using the generated password.
   oc login -u kubeadmin -p <token_from_install>
9. Give the ocpadmin user cluster admin permissions as mentioned in Using RBAC to define and apply permissions. This user is the new cluster admin.
   oc adm policy add-cluster-role-to-user cluster-admin ocpadmin
10. Log out as kubeadmin.
    oc logout
11. Log in and log out as cpadmin so the user object is created.
    oc login -u cpadmin -p 123456
    oc logout
12. Log in as the new cluster admin. ocpadmin in this example.
    oc login -u ocpadmin -p 123456
13. Optional: Once you have a real cluster admin user, you can remove the secret that allows the kubeadmin user to work as mentioned in Removing the kubeadmin user.
    oc delete secrets kubeadmin -n kube-system