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How to search for errors in software or hardware

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i have this server vm and some services on it, namely mqtt, nodered, influxdb and grafana. i run into some weird errors: the vm stops working for some unknown reason and blocks all traffic to it. that's not good. i know it's not the hypervisor.

what are the best practices for searching and finding errors on the side of the operating system? which logs to check, how to find the error in generell, what to do? is there any general advice in how to hunt down bugs like that? what can i do to find the error(s)?

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