Why some time my coreos hangs?

I newly with coreos. I often create or reload my docker containers. All work fine. But some time my coreos hangs. I can’t not connect to it from ssh, no docker containers responds by network. What logs can I see for solve problem?

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A good place to start is with something such as an MTR or ping when the issue is occurring. This will give you an idea if the droplet is responding to anything at all.

For logs, it’s hard to say, as you will want to get an idea of what’s going on first. For the most part, most logs are found in the /var/log/ folder. You can find a great guide on viewing logs here

If I had to guess, something is using up all your resources. It seems like it based on the symptoms. So You may want to check the logs of services running. The dmesg command may also be of help, as it may indicate errors with memory, CPU, disk, etc that may shed some light.