Red Hat Summit19.3. Uninstalling an IdM client: additional steps after multiple past installations
If you install and uninstall a host as an Identity Management (IdM) client multiple times, the uninstallation procedure might not restore the pre-IdM Kerberos configuration.
In this situation, you must manually remove the IdM Kerberos configuration. In extreme cases, you must reinstall the operating system.
Prerequisites
-
You have used the
ipa-client-install --uninstallcommand to uninstall the IdM client configuration from the host. However, you can still obtain a Kerberos ticket-granting ticket (TGT) for an IdM user from the IdM server. -
You have checked that the
/var/lib/ipa-client/sysrestoredirectory is empty and hence you cannot restore the prior-to-IdM-client configuration of the system using the files in the directory.
Procedure
Check the
/etc/krb5.conf.ipafile:If the contents of the
/etc/krb5.conf.ipafile are the same as the contents of thekrb5.conffile prior to the installation of the IdM client, you can:Remove the
/etc/krb5.conffile:# rm /etc/krb5.confRename the
/etc/krb5.conf.ipafile into/etc/krb5.conf:# mv /etc/krb5.conf.ipa /etc/krb5.conf
-
If the contents of the
/etc/krb5.conf.ipafile are not the same as the contents of thekrb5.conffile prior to the installation of the IdM client, you can at least restore the Kerberos configuration to the state directly after the installation of the operating system:
Re-install the
krb5-libspackage:# dnf reinstall krb5-libsAs a dependency, this command will also re-install the
krb5-workstationpackage and the original version of the/etc/krb5.conffile.
-
Remove the
var/log/ipaclient-install.logfile if present.
Verification
On the IdM client, try to obtain IdM user credentials. This should fail:
# kinit admin kinit: Client 'admin@EXAMPLE.COM' not found in Kerberos database while getting initial credentials #
The /etc/krb5.conf file is now restored to its factory state. As a result, you cannot obtain a Kerberos TGT for an IdM user on the host.
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