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ae6a2ba810
There were minimal grammatical and spelling mistakes in the files which I corrected as documentation proof reading. Also added information about few ipsec vpn parameters.
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47 lines
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.. _vyosonvmware:
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Running on VMware ESXi
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######################
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ESXi 5.5 or later
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*****************
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.ova files are available for supporting users, and a VyOS can also be stood up
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using a generic Linux instance, and attaching the bootable ISO file and
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installing from the ISO using the normal process around `install image`.
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.. NOTE:: There have been previous documented issues with GRE/IPSEC tunneling
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using the E1000 adapter on the VyOS guest, and use of the VMXNET3 has been
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advised.
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Memory Contention Considerations
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--------------------------------
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When the underlying ESXi host is approaching ~92% memory utilisation it will
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start the balloon process in a 'soft' state to start reclaiming memory from
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guest operating systems. This causes an artificial pressure using the vmmemctl
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driver on memory usage on the virtual guest. As VyOS by default does not have
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a swap file, this vmmemctl pressure is unable to force processes to move in
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memory data to the paging file, and blindly consumes memory forcing the
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virtual guest into a low memory state with no way to escape. The balloon
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can expand to 65% of guest allocated memory, so a VyOS guest running >35% of
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memory usage, can encounter an out of memory situation, and trigger the kernel
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oom_kill process. At this point a weighted lottery favouring memory hungry
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processes will be run with the unlucky winner being terminated by the kernel.
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It is advised that VyOS routers are configured in a resource group with
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adequate memory reservations so that ballooning is not inflicted on
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virtual VyOS guests.
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References
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----------
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.. stop_vyoslinter
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https://muralidba.blogspot.com/2018/03/how-does-linux-out-of-memory-oom-killer.html
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.. start_vyoslinter
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