i have error on postgresql 2026-03-18 08:15:56.455 UTC [51555] ERROR: could not resize shared memory segment "/PostgreSQL.243058984" to 16777216 bytes: No space left on device

The PostgreSQL error you shared - "could not resize shared memory segment: No space left on device" - is caused by the default shared memory (SHM) size being too small. The default is 64MB. You can increase it by adding the RAILWAY_SHM_SIZE_BYTES variable to your PostgreSQL service's environment variables. For example, to set it to 256MB, use the value 268435456. After adding the variable, redeploy your PostgreSQL service. This is very likely the cause of your slow performance and 502/499 errors, as PostgreSQL cannot function properly when it runs out of shared memory. More details here: PostgreSQL docs.

Sam, please take a look at this: https://station.railway.com/questions/database-down-again-51872573

I also have a lot of 499 errors by 12:20 CET

still problem

Hey, in addition to the SHM sizing that Sam mentioned above, we also identified elevated connections on a single machine in our infrastructure that was contributing to the 502/499 errors around this timeframe. That infrastructure issue has been resolved. If you're still experiencing issues after increasing the SHM size and redeploying, please let us know.

@angelo-railway this is still an issue.

Hi all, the infrastructure disruption Angelo mentioned has been resolved but anyone here is still running into the 502/499 errors, could you please try the SHM fix Sam described? (add RAILWAY_SHM_SIZE_BYTES=268435456 to your Postgres service and redeploy)

If that still doesn't fix it, please open a thread with your project link and we'll look into it!