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DiverseAndRemote.com
Asked: 2012-12-03 13:16:47 +0800 CST

how to drop_caches in OpenVZ centos6 container

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I have tried 

sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'

sudo echo 3 > /proc/sys/vm/drop_caches

echo 3 > /proc/sys/vm/drop_caches

echo 3 | sudo tee /proc/sys/vm/drop_caches

and a bunch of other variations but with every try I get 

bash: /proc/sys/vm/drop_caches: Permission denied

How do I clear the ram used for buffers/cache in my centos6 openvz container?

It seems like the only way to do what I need is to reboot the container.

centos

2 Answers

  1. Best Answer

    Get a real non-OpenVZ machine (KVM, Xen, etc) and this will work just fine. With OpenVZ, you don't get your own kernel instance and as such, are restricted from performing commands like this.

    • 4 
  2. echo 3 | sudo tee /proc/sys/vm/drop_caches
    • 0