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| author | Michael J. Carmody <mjcar@mikeit.com.au> | 2019-09-24 16:12:09 +1000 |
|---|---|---|
| committer | Michael J. Carmody <mjcar@mikeit.com.au> | 2019-09-24 16:12:09 +1000 |
| commit | ef010e6456b796b5fc7bcf33793255ccd89b53a6 (patch) | |
| tree | 3f8e0fae20e5f685bd3c892a3a64d8f968afe09c /docs | |
| parent | fab0fff43b2ec633de21355865d2cb91e8c18086 (diff) | |
| download | vyos-documentation-ef010e6456b796b5fc7bcf33793255ccd89b53a6.tar.gz vyos-documentation-ef010e6456b796b5fc7bcf33793255ccd89b53a6.zip | |
feature: adding notes for running on vmware around contending memory and memory management in low memory situations
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/appendix/vyos-on-vmware.rst | 32 | ||||
| -rw-r--r-- | docs/index.rst | 1 |
2 files changed, 33 insertions, 0 deletions
diff --git a/docs/appendix/vyos-on-vmware.rst b/docs/appendix/vyos-on-vmware.rst new file mode 100644 index 00000000..85b4cef5 --- /dev/null +++ b/docs/appendix/vyos-on-vmware.rst @@ -0,0 +1,32 @@ +.. _vyosonvmware:
+
+Running on VMWare ESXi
+#####################
+
+ESXi 5.5 or later
+****************
+
+.ova files are available for supporting users, and a VyOS can also be stood up using a generic Linux instance, and attaching the bootable ISO file and installing from the ISO
+using the normal process around `install image`.
+
+.. NOTE:: There have been previous documented issues with GRE/IPSEC tunneling using the E1000 adapter on the VyOS guest, and use of the VMXNET3 has been advised.
+
+Memory Contention Considerations
+--------------------------------
+When the underlying ESXi host is approaching ~92% memory utilisation it will start the balloon process in s a 'soft' state to start reclaiming memory from guest operating systems.
+This causes an artifical pressure using the vmmemctl driver on memory usage on the virtual guest. As VyOS by default does not have a swap file, this vmmemctl pressure is unable to
+force processes to move in memory data to the paging file, and blindly consumes memory forcing the virtual guest into a low memory state with no way to escape. The balloon can expand to 65% of
+guest allocated memory, so a VyOS guest running >35% of memory usage, can encoutner an out of memory situation, and trigger the kernel oom_kill process. At this point a weighted
+lottery favouring memory hungry processes will be run with the unlucky winner being terminated by the kernel.
+
+It is advised that VyOS routers are configured in a resource group with adequate memory reservations so that ballooning is not inflicted on virtual VyOS guests.
+
+
+
+
+
+References
+----------
+
+https://muralidba.blogspot.com/2018/03/how-does-linux-out-of-memory-oom-killer.html
+
diff --git a/docs/index.rst b/docs/index.rst index 58461850..59b74b38 100644 --- a/docs/index.rst +++ b/docs/index.rst @@ -43,6 +43,7 @@ as a router and firewall platform for cloud deployments. appendix/troubleshooting.rst appendix/examples/index.rst appendix/commandtree/index.rst + appendix/vyos-on-vmware.rst appendix/vyos-on-baremetal.rst appendix/migrate-from-vyatta.rst |