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tutorial:adm:server_os_updates [2019/12/17 07:47] fiserp [Performing the OS update] |
tutorial:adm:server_os_updates [2019/12/17 07:52] fiserp [Solving issues] |
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* Know how long (at worst) the whole rollback will take (rollback time **RT**). | * Know how long (at worst) the whole rollback will take (rollback time **RT**). | ||
* Have a maintenance window that spans at least **MT**+**RT** with some extra time **ET**. | * Have a maintenance window that spans at least **MT**+**RT** with some extra time **ET**. | ||
- | * You are not able to safely perform the maintenance in shorter window, there is simply not enough time. If something goes wrong, you need at most **RT** time to perform the rollback! | + | * You are not able to safely perform the maintenance in shorter window, there is simply not enough time. If something goes wrong, you will need **RT** time to perform the rollback! |
- | * If you do not have any **ET**, if anything goes wrong you have to perform rollback procedure. Therefore, **ET** gives you some time you can spend on solving the issue so you can carry on with updates. | + | * When you have no **ET**, if anything goes wrong you have to perform rollback procedure. Therefore, **ET** gives you some time you can spend on solving the issue so you can carry on with updates. |
- | You should have a rollback procedure that can safely restore the deployment. This depends on your environment. | + | * You should have a rollback procedure that can safely restore the deployment. |
- | + | * This depends on your environment | |
- | Fortunately, | + | |
- | Minor issues can be generally resolved with the help of ``/boot`` and ``/etc`` backups you created before updating the OS. | + | * After restoring the snapshot, you have to perform tests (with test use-cases) to confirm the rollback was performed correctly. |
- | + | | |
- | If IdM installation gets hit, you can debug the configuration or restore it from periodic backup. Since IdM is not installed from OS packages, this basically never happens. | + | |