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Logserver: Allow many TCP sessions.
We would like to allow our clients to send their logs over TCP for more reliable delivery, and so they will be able to detect if the central log server is not running. By default, the imtcp input module only allows 200 concurrent connections, though, which is a bit small. Increase that to 4096, which should be enough for a long time for NSC (at least as long as worker nodes in our compute clusters don't send logs directly, but relay via a cluster head node). We also need to increase the maximum number of open files (i.e. the 'ulimit -n' limit) for this to work.
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