VDS hangs how to find out the reason?

Question

linux

how to find out the cause of hanging OS Centos. Hangs VDS tightly only reboot helps.
It hangs not even at the moment of loading when there are 100 people on the sites, but usually it hangs when there are 10-20 people on the site. In the messages log, the last entry is 30 minutes before the hangup, how to find out the cause of the hangup and how to make the system reboot itself in case of a failure.
RAM: 2 GB
Processor: Xeon 2 core
HDD 100 GB

Answer 1

Is kdump enabled? You can see if a kernel error occurs.
I recently encountered a problem that CentOS 7 was unstable on Xeon D-1521 of the Intel skylake family. On skylake in the Linux kernel (including in recent versions) there are problems with working with power-saving functions that dynamically lower frequencies. Installing microcode_ctl package from rep might help