Month: May 2018

Configure and Troubleshoot LDAP on OpenShift

One of the most frequent asked questions that I get is how to configure LDAP on OpenShift. Instead of replying back with my PDF every time I get a request about this. It maybe good to share the info here, so I can always refer back to. As for configuring LDAP on OpenShift is pretty straight forward if you have all the correct information to connect. In the blog I will walk you through the configuration for both pre & post installation options. Also, I will provide some of the troubleshooting steps on how to debug if you run into issues.

Problem: Can’t login with LDAP users.

AD usually is using sAMAccountName as uid for login. LDAP usually is using uid for login

Step 1

Use the following ldapsearch to validate the informaiton was given by customer: ldapsearch -x – D “CN=xxx,OU=Service-Accounts,OU=DCS,DC=homeoffice,DC=example,DC=com” \ -W -H ldaps://ldaphost.example.com -b “ou=Users,dc=office,dc=example,DC=com” \ -s sub ‘sAMAccountName=user1’

If the ldapsearch did not return any user, it means -D or -b may not be correct. Retry different baseDN. If there is too many enteries returns, add filter to your search. Filter example is (objectclass=people)

filter example: (objectclass=person)

Step 2

Logging: set OPTIONS=–loglevel=5 in /etc/sysconfig/atomic-openshift-master step 3

Since customer had htpasswd provider setup before switch to Active Directory and the user identity was created for the same users. In journalctl -u atomic-openshift-master, it logged conflict with the user identity when user trying to login.

Here was the step
oc get identity 
oc delete identity <name_of_identity_that_user1> 
oc get user oc delete user user1
Inspiration from :
https://access.redhat.com/solutions/2016873
https://access.redhat.com/solutions/1978013
Final configuration in master-config.yaml was as shown below.

oauthConfig:
  assetPublicURL: https://master.example.com:8443/console/
  grantConfig:
    method: auto
  identityProviders:
  - name: "OfficeAD"
    challenge: true
    login: true
    provider:
      apiVersion: v1
      kind: LDAPPasswordIdentityProvider
      attributes:
        id:
        - dn
        email:
        - mail
        name:
        - cn
        preferredUsername:
        - sAMAccountName
      bindDN: "CN=LinuxSVC,OU=Service-Accounts,OU=DCS,DC=office,DC=example,DC=com"
      bindPassword: "password"
      ca: ad-ca.pem.crt
      insecure: false
      url: "ldaps://ad-server.example.com:636/CN=Users,DC=hoffice,DC=example,DC=com?sAMAccountName?sub"