VM removing Java installation

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VM removing Java installation

Andrew Robie 1

I set up a VM to do some Java development on azure and installed a number of tools including Oracle JDK 1.8 u202. Everything works fine for the most part, but certain things seem to remove some or all parts of the JDK installation. It seems to happen overnight pretty consistently, resizing seems to cause it, and occasionally restarting does too. Reinstalling Java isn't particularly difficult so it's not a blocker, and this is a pretty old version of Java, so I was wondering if this is expected behavior or if there's something up with my VM.

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Answer 1

deherman-MSFT 38,021 Microsoft Employee Moderator

@Andrew Robie
I understand that your Java installation is disappearing overnight, sometimes after resizing or a restart. Let me know if I am missing something.

Based on the clues you provided I am guessing you might be installing this on the temporary disk. The temporary disk provides short-term storage for applications and processes, and is intended to only store data such as page or swap files. Data on the temporary disk may be lost during a maintenance event or when you redeploy a VM.

On Azure Linux VMs, the temporary disk is typically /dev/sdb and on Windows VMs the temporary disk is D: by default. The temporary disk is not encrypted by server side encryption unless you enable encryption at host.

Can you confirm if you are installing this on the main data disk or OS disk?

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Andrew Robie 1 Reputation point

2022-03-15T12:38:55.817+00:00

@deherman-MSFT I'm installing it to its default location of C:\Program Files.
deherman-MSFT 38,021 Reputation points Microsoft Employee Moderator

2022-03-15T20:32:10.38+00:00

@Andrew Robie Microsoft does not delete files or programs from the C:\ drive. Have you checked to see if there is any automation or something which might be removing it? Also check java settings to see if there is some automatic update or change occurring. You might try checking the application logs in Even Viewer for hints as to what is happening.
https://betterstack.com/community/guides/logging/how-to-view-and-analyze-logs-with-windows-event-viewer/
Andrew Robie 1 Reputation point

2022-03-16T12:10:04.907+00:00

@deherman-MSFT I'm using the same JDK installation with the same configuration on my desktop and it says in place as expected, so it seems to be specific to the Azure VM. To my knowledge there aren't any policies on our slice aside from general resource clean up after a time window which I've disabled for my resource group. I'll take a look at the event viewer, thanks.
Andrew Robie 1 Reputation point

2022-03-16T17:25:59.983+00:00

I looked through the event viewer logs and I found these two event types related to that Java installation

From Application logs:

Application 'C:\Program Files\Java\jdk1.8.0_202\bin\java.exe' (pid 10396) cannot be restarted - Application SID does not match Conductor SID..

From Security logs:

A rule was listed when the Windows Firewall started.

Profile used: Public

Rule:
Rule ID: UDP Query User{B6344BBC-3FE5-4F0C-B3B9-09BD15BAE6B8}C:\program files\java\jdk1.8.0_202\bin\java.exe
Rule Name: Java(TM) Platform SE binary

Would either of these have anything to do with it getting removed?
deherman-MSFT 38,021 Reputation points Microsoft Employee Moderator

2022-03-16T18:31:34.937+00:00

@Andrew Robie It appears that the process is unable to run after restart. The error from the application logs indicates that there is a permissions issue. The error ”Application SID does not match Conductor SID” will be generated whenever the user account the service is being run under does not match the user account used to launch the setup instance. The term “Conductor” refers to the MSI setup engine. It also appears that if the setup is executed with elevated permissions (Run As Administrator), then the SID check is bypassed. This behavior is by design and is intended to prevent the malicious restarting of critical system services.
Andrew Robie 1 Reputation point

2022-03-17T18:06:17.547+00:00

Does that mean that the VM manager is intentionally not including the Java installation when the VM restarts?
deherman-MSFT 38,021 Reputation points Microsoft Employee Moderator

2022-03-18T17:19:05.117+00:00

No, the OS is unable to start the java process after restart due to permissions issue.
Andrew Robie 1 Reputation point

2022-03-18T19:35:37.497+00:00

@deherman-MSFT The only Java process that might have been running should've been my IDE one time when I got prompted for a restart. Since that seems to be unrelated to the JDK directory getting removed, is there anything else I can check to see why this might be happening?

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VM removing Java installation

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