在IBM Cloud上为Python Cloud Foundry应用程序调整DB2 keepalive设置

Question

I have a working Python Cloud Foundry app on Bluemix / IBM Cloud that connects to, and otherwise works well with a DB2 on Cloud instance on Bluemix / IBM Cloud.

However, after long intervals (I haven't been able to measure the time), the connection to DB2 closes, and my queries fail. I could modify my code to check for this, but it would be great to be able to adjust the TCP keepalive settings. Something along the lines of this .

Would greatly appreciate any pointers. I'm not sure how one adjusts the client-side settings on a Python Cloud Foundry app.

Cheers.

Answer 1

I tried reproducing this using a Python Flask Cloud Foundry app and a Db2 on Cloud Lite plan instance. My connections seem to stay alive for hours. It might be the python application you are running that has some kind of timeout.

Answer 2

I could not find a satisfactory resolution. Like @jackic23 mentioned, there may be other factors at play. Few things:

• The problem is hard to replicate
• The app works fine on localhost, but not when deployed
• I do have other simultaneous CRUD operations happening, which may be potentially conflicting somehow. There could be a race condition that somehow never happens on localhost.
• My flask app is deployed using gunicorn , which was killing the worker thread after 30 seconds, so the DB connection terminated mid-query. I adjusted the timeout to 75 seconds, but then the query started returning in under 1 s.

At this point, I have switched to an Enterprise DB2 plan, and the app is working fine. To @jackic23's point, there may still be something else going on here (in my app's code) that may eventually need to be figured out.

For now, I'm moving on. Thank you @jackic23 for looking into this!