Werk #17754: Do not open an unlimited amount of file descriptors in the EC
| Component | Event Console | ||||||
| Title | Do not open an unlimited amount of file descriptors in the EC | ||||||
| Date | Jun 16, 2025 | ||||||
| Level | Trivial Change | ||||||
| Class | Bug Fix | ||||||
| Compatibility | Compatible - no manual interaction needed | ||||||
| Checkmk versions & editions |
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Previously, the event console accepted an unlimited amount of concurrent connections via TCP and the UNIX domain socket. This could lead to running out of file descriptors in the EC process. We limit the number of concurrent connections now to a fixed value to avoid this. When reaching that limit, any new connections are queued in the OS queue, and when even that is full, the client gets an error, which is the right thing here.
Note: The limit is currently at a relatively arbitrary high number (900 concurrent connections), making this configurable is probably not needed. The only essential thing is that we have some breathing room below the hard limit of 1024 file descriptors caused by the usage of select().