Log Collection: Collecting logs of the whole installation process
-----------------------------------------------------------------

The ability to collect logs during the installation (diskful and diskless) can be enabled by setting the "site.xcatdebugmode" to different levels (0,1,2), which is quite helpful when debugging installation problems.

The diskful provision logs:
``````````````````````````````````
+---------------------+--------------+--------------+--------------+
|  **xcatdebugmode**  |       0      |       1      |       2      |
+---------------------+----+----+----+----+----+----+----+----+----+
| OS Distribution     |RHEL|SLES|UBT |RHEL|SLES|UBT |RHEL|SLES|UBT |
+================+====+====+====+====+====+====+====+====+====+====+
| Pre-Install    | MN | N            | N            | N            |
+  logs          +----+----+----+----+----+----+----+----+----+----+
|                | CN | C1           | C1   C2      | C1   C2      |
+----------------+----+----+----+----+----+----+----+----+----+----+
| Installer      | MN | N  | N  | N  | M1 | M1 | M1 | M1 | M1 | M1 |
+  logs          +----+----+----+----+----+----+----+----+----+----+
|                | CN | C3 | C3 | C3 | C3 | C3 | C3 | C3 | C3 | C3 |
+----------------+----+----+----+----+----+----+----+----+----+----+
| Post-Install   | MN | M2           | M3           | M3           |
+  logs          +----+----+----+----+----+----+----+----+----+----+
|                | CN | C1           | C1   C2      | C1   C2      |
+----------------+----+----+----+----+----+----+----+----+----+----+
| PostBootScript | MN | M2           | M3           | M3           |
+  logs          +----+----+----+----+----+----+----+----+----+----+
|                | CN | C1           | C1   C2      | C1   C2      |
+----------------+----+----+----+----+----+----+----+----+----+----+

The diskless provision logs:
```````````````````````````````````
+---------------------+--------------+--------------+--------------+
|  **xcatdebugmode**  |      0       |       1      |       2      |
+---------------------+----+----+----+----+----+----+----+----+----+
| OS Distribution     |RHEL|SLES|UBT |RHEL|SLES|UBT |RHEL|SLES|UBT |
+================+====+====+====+====+====+====+====+====+====+====+
| Provision      | MN | N            | M3           | M3           |
+  logs          +----+----+----+----+----+----+----+----+----+----+
|                | CN | N            | N            | N            |
+----------------+----+----+----+----+----+----+----+----+----+----+
| PostBootScript | MN | M3           | M3   M4      | M3   M4      |
+  logs          +----+----+----+----+----+----+----+----+----+----+
|                | CN | C1           | C1   C2      | C1   C2      |
+----------------+----+----+----+----+----+----+----+----+----+----+

* **Pre-Install** logs: the logs of pre-installation scripts, including:

  * ``%pre`` section in anaconda,
  * ``<pre-scripts/>`` section for SUSE and ``partman/early_command`` and ``preseed/early_command`` sections for ubuntu.
  * STDOUT and STDERR of the scripts
  * debug trace output of bash scripts with ``set -x``

* **Installer** logs: the logs from the os installer itself, i.e, the logs of installation program (anaconda, autoyast and preseed,etc.)

* **Post-Install** logs: the logs of post-installation scripts, including

  * ``%post`` section in anaconda,
  * ``<chroot-scripts/>`` and ``<post-scripts/>`` sections for SUSE and ``preseed/late_command`` section for ubuntu.
  * STDOUT and STDERR of the scripts
  * debug trace output of bash scripts with ``set -x``

* **Provision** logs: the logs during the diskless provision.

* **PostBootScript** logs: the logs during the post boot scripts execution, which are specified in ``postbootscripts`` attribute of node and osimage definition and run during the 1st reboot after installation.

MN: the logs forwarded to management node:

* M1: the installer logs will be forwarded to the MN in ``/var/log/xcat/computes.log`` file.

* M2: the error messages will be forwarded to ``/var/log/xcat/computes.log`` file on MN only when critical error happens.

* M3: the installation logs will be forwarded to ``/var/log/xcat/computes.log`` file on MN.

* M4: the debug trace(``set -x`` or ``-o xtrace``) of bash scripts enabled.

* N: the logs will not be forwarded to MN.

CN: the logs on compute node:

* C1 - the installation logs will be saved to ``/var/log/xcat/xcat.log`` file on CN.

* C2 - the debug trace(``set -x`` or ``-o xtrace``) of bash scripts enabled.

* C3 - the installer logs will be saved to the CN in ``/var/log/anaconda`` for RHEL, ``/var/log/YaST2`` for SLES, ``/var/log/installer`` for UBT.

* N - the logs will not be saved to CN.

