NetWeaver ABAP, SICK and UUID on Linux

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Situation

Newly installed NetWeaver ABAP 7.5 system on top of SUSE Enterprise Linux 12. Installation via sapinst was executed without errors. NetWeaver system is up and running, first logon into SAP system via SAPGui. Some programs are compiled when logging in, and all ends in a runtime error message.

Error screen

Analysis

Error message contains a hint to SAP note 1391070. The SAP Note states that the UUID service on the Linux server is broken and needs to be fixed. A shell script (check-libuuid.sh) that you need to run to get a better error analysis is included in the note. Copy the script to your Linux computer and make it executable:

chmod u+x check-libuuid.sh

Output

The output of the script will tell you what you did wrong and how to fix it.

./check-libuuid.sh

Output

In the output the steps to solve the problem are given.

Solution: activate UUID daemon

See also SAP Note 1984787 on how to configure the UUID service.

  1. Enable the daemon: systemctl enable uuidd
  2. Run the daemon: systemctl start uuid

  3. Check status of deamon: systemctl status uuidd.socket

  4. Final check of uuidd using script from SAP Note

It seems normal to be able to simply use a Linux distribution to run a SAP system that has the name “for SAP” in its name, but that`s obviously a newbie assumption. The UUID daemon delivered with SLES for SAP SP12 does not create unique id. Not sure how this wasn`t discovered – or more precisely, how this was discovered – but it is as it is. No need to panic, a solution is available. Moreover, this means that you cannot simply go out there and install an SAP system and expect it to work, you have to read the documentation (didn`t find the uuidd error there) and even more important, the SAP notes.

Erroneous libuuid and uuidd

SEL12 comes with a bug in uuidd. The generated numbers are not unique (yes, testing is not everyone strength). To find out if this bug and therefore, target of an imminent upgrade affects your uuidd, use the shell script.

./check-libuuid.sh

Output

The output states clearly that you need to update your libuuid and uuidd.

Solution: update libuuid and uuidd

The solution is simple. Do as advised by the given SAP note. If you are not a customer of SUSE for their enterprise distribution, you can register for a 60 day trial which gives you access to the update server at no cost. I tried to compile a newer version, without success. It seems the script checks the rpm version and not the actual version of uuidd in use.

Register at SUSE (for trial)

To be able to update the UUIDD package, you need to be registered at SUSE. I was using Yast2 and wasn`t able to update the packages; I got an error when registering. No luck at all. Using the command line tool, however, I was able to register my server.

SUSEConnect –r <code> -e <email> -u https://scc.suse.com

Output

Checking the dashboard at SUSE customer center shows the system is registered.

Now Yast2 let me connect to the update server and I could update the program.

Result

The check tool is OK with the newly installed version of uuidd.

Reinstall the system?

The original error message stated that an installation error occurred. The root cause is now solved, however, installation error sounds pretty much like: system screwed up beyond all repair. Do you now have to reinstall the whole SAP NetWeaver ABAP system? Not a hard task, but time consuming. I do believe that the SAP team responsible for the installer knows what they are doing and in case the UUIDD bug would have prevented a successful installation, the installer would have told me so. Therefore, I did not reinstall the system (hey, only for demo anyway) and started NetWeaver. And logged on. And finally got no error message, but this:

To be sure, I ran SICK (transaction SM28):

Will keep you posted in case the system is FUBAR. For now it looks good. And is fast.

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2 thoughts on “NetWeaver ABAP, SICK and UUID on Linux

  1. Pingback: Install your own SAP NetWeaver ABAP system | It`s full of stars!

  2. Pingback: UUIDD problem when running SAP NW ABAP inside Docker | It`s full of stars!

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