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OpenVZ node : Unable to fork: Cannot allocate memory
When you see a message “Unable to fork: Cannot allocate memory” while logging to a VPS from the node. The reason is the VPS is running out of resources RAM. To temporary solve this issue, you may restart the VPS by executing below command:

vzctl restart VEID

NOTE : Replace your VEID with your VPS ID.

OR increase RAM of the VPS and increase "privvmpages" and "kmemsize" parameters for the VPS in below file:

Edit the configuration file of the VPS

vi /etc/sysconfig/vz-scripts/veid.conf

After increase the value of the above two parameters, restart the VPS.

Let me know your views in our comment section below.
Thanks perfect solution.

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