Running WinCC OA on CentOS with User other than root.

[Harish]

We have installed WinCC 3.15 on CentOS. And running /executing WinCC Application with a User other than root.

Scenario:

WinCC Console is running as service.

This user has execute rights on all folders.

With this user some functions can not be executed, they returns error. e.g. Online backup returns following error: "WCCOAToolMedia ended unexpectedly"

Are there any standard suggestions/practices to run WinCC OA on CentOS as another user (other than root).

We will be happy if you share your experinces with this.

[mkoller]

"This user has execute rights on all folders."
You have 2 folder trees: the installation and your project.
This user needs at least rx rights on all directories in the installation and the project and it needs write rights for all files in the project.
You simply can make this user the owner of the whole project tree.

[Harish]

Hi Martin,

thanks for your reply.

The user has all rights to those directories you mentioned. Still it won't work.

Just to test we tried with all rights to all directories without any success.


Regards,

Harish

[mkoller]

Then please get in contact with our support crew and describe exactly what you tried and what does not work with which errors

[leoknipp]

Our support was working on similar topics in the last time.
Have you been in contact with the support?
Does it work when WinCC OA is not running as service?

Best Regards
Leopold Knipp
Senior Support Specialist

[Harish]

Yes, we already forwarded this issue to our Siemens partner.

Everything works fine if WinCC OA is running as Desktop application.

Regards,

Harish

[agruber]

When I have tested for your error description I could not see the same one, but I have found some other problem.

On the more modern operating systems the sudo command lets certain environment variables not pass through to the called command with sudo, even when "preserve env"-flag (-E) is set.

With our suggested way in the documentation to run the pmon as another user the WinCC OA bin path is not added to the PATH environment variable from the WinCC OA processes, this results in WCCOAtoolMedia not to be found when running the online backup.

But the error message in that case is a different one:

Code: Select all

WCCILdata0:error in exec WCCOAtoolMedia: Datei oder Verzeichnis nicht gefunden
WCCILdata    (0), 2017.06.30 11:41:56.728, SYS,  SEVERE,    113, Online-Backup of database, DataManDpInternSup, refreshBckupStatus, Could not open output file from WCCOAtoolMedia

This is fixed in the upcoming P004 or can be solved by modification of the PMON start when you use the "old" init.d method. Within the init.d script call your pmon like this:

Code: Select all

sudo -E -u myOSuser PATH=$PATH LD_LIBRARY_PATH=$LD_LIBRARY_PATH ${PVSS_PATH}/bin/WCCILpmon &

As said, your error is different, so it will probably not solve your issue. But its worth a try.

BR,
Andreas
Customer Care

[Harish]

Hi Andreas,

I will give try. On positive results, i will post here.

Thanks.

Regards,

Harish