how to drop_caches in OpenVZ centos6 container

Question

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.

Why would you want to? – David Schwartz Dec 03 '12 at 02:45 — David Schwartz, Dec 03 '12 at 02:45

score 4 · Accepted Answer · answered Dec 02 '12 at 21:19

4

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.

answered Dec 02 '12 at 21:19

EEAA

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score 0 · Answer 2 · answered Dec 02 '12 at 21:17

0

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

answered Dec 02 '12 at 21:17

Dennis Kaarsemaker

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That was one of the things I also tried and it doesn't work – DiverseAndRemote.com Dec 03 '12 at 00:14

how to drop_caches in OpenVZ centos6 container

2 Answers2

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