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Description of problem: ipa upgrade fails from RHEL7.0 to RHEL7.6


Version-Release number of selected component (if applicable):
From RHEL7.0 ---> RHEL7.6

How reproducible: Always.


Steps to Reproduce:
1. Install IPA Server on RHEL7.0
2. Setup RHEL7.6 repo
3. yum update -y

Actual results: Upgrade fails from RHEL7.0 to RHEL7.6


Expected results: Upgrade from RHEL7.0 to RHEL7.6 should work without any errors


Additional info: Refer comment #24 in bz1596467
Logging seperate bug as per comment #27 in bz1596467

Created attachment 1475538 [details]
Logs for upgrade

It seems similar to 1482776  ipa upgrade fails with error message "RuntimeError: attribute "allowWeakCipher" not allowed" for older builds

and the doc [1] states:

Red Hat recommends upgrading to the next version only. For example, if you want to upgrade to Identity Management for Red Hat Enterprise Linux 7.4, we recommend upgrading from Identity Management for Red Hat Enterprise Linux 7.3. Upgrading from earlier versions can cause problems. 

Petr, I think the above means that we do not support 7.0 -> 7.6 direct update, do you confirm my understanding? If it's the case, we can close this issue as a duplicate of 1482776.

[1] https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/linux_domain_identity_authentication_and_policy_guide/updating-migrating#update-ipa-prereqs