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tutorial:adm:server_os_updates [2019/12/17 07:43]
fiserp [Performing the OS update] 		tutorial:adm:server_os_updates [2019/12/17 07:50]
fiserp [Solving issues]
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   - Perform the update   - Perform the update
     - Begin the maintenance.     - Begin the maintenance.
 +    - Disable monitoring system notifications.
     - (If you use hot snapshots, make one.)     - (If you use hot snapshots, make one.)
     - Make sure no user or external application can access the IdM.     - Make sure no user or external application can access the IdM.
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     - Make backup of ``/boot``, ``/etc``, list of processes ``ps -ef`` and list of network services ``netstat -tulnp`` (or ``ss -tulnp``). Those dumps will help you check if all the services started. You can also recover some settings from backups in case something goes wrong (in a minor way) - you will not need to roll back whole snapshot.     - Make backup of ``/boot``, ``/etc``, list of processes ``ps -ef`` and list of network services ``netstat -tulnp`` (or ``ss -tulnp``). Those dumps will help you check if all the services started. You can also recover some settings from backups in case something goes wrong (in a minor way) - you will not need to roll back whole snapshot.
     - Perform the update (e.g. ``yum update``).     - Perform the update (e.g. ``yum update``).
-    - Reboot the affected services or the whole machine if necessary.+    - Restart affected services or reboot the whole machine if necessary.
     - When the machine is up, check ``dmesg`` and ``/var/log/{messages,syslog}`` or analogous files for your OS.     - When the machine is up, check ``dmesg`` and ``/var/log/{messages,syslog}`` or analogous files for your OS.
     - Check running processes and network services whether everything started properly.     - Check running processes and network services whether everything started properly.
       - Namely PostgreSQL and HTTPd should be up and running. Those are parts of IdM deployment.       - Namely PostgreSQL and HTTPd should be up and running. Those are parts of IdM deployment.
     - If everything is ok, start the IdM service.     - If everything is ok, start the IdM service.
-    - Enable autostart of IdM service upon OS start. 
     - Check IdM logs whether it started successfuly.     - Check IdM logs whether it started successfuly.
     - Log into the IdM and test connection to end systems (configuration form for the system, green button "Test connector").     - Log into the IdM and test connection to end systems (configuration form for the system, green button "Test connector").
     - Check your testing use-cases.     - Check your testing use-cases.
 +    - Enable autostart of IdM service upon OS start.
 +    - (If there were changes to the database (e.g. PostgreSQL major version upgrade), make a backup of the upgraded database.)
     - Allow users to access the IdM.     - Allow users to access the IdM.
 +    - Enable monitoring system notifications.
     - End the maintenance.     - End the maintenance.
   - Wrap-up   - Wrap-up
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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 and on the way you updated OS packages.
  
 Fortunately, in most cases it simply means restoring the snapshot of the virtual machine. After restoring the snapshot, you have to perform tests (with test use-cases) to confirm the rollback was performed correctly. Fortunately, in most cases it simply means restoring the snapshot of the virtual machine. After restoring the snapshot, you have to perform tests (with test use-cases) to confirm the rollback was performed correctly.
  • by fiserp