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Disable migration [message #37591]

Mon, 28 September 2009 19:19

tyggna
Messages: 1
Registered: September 2009

Junior Member

Is there a configuration directive I can use to disable the migration feature?

I'm in an environment where kernel memory is scarce--and being rid of the 8 process threads that migration spawns would be very helpful.

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Re: Disable migration [message #37595 is a reply to message #37591]

Tue, 29 September 2009 07:31

curx
Messages: 739
Registered: February 2006
Location: Nürnberg, Germany

Senior Member

Hi,

you can disable to load OpenVZ migration/checkpointing linux kernel modules, vzrst and vzcpt in vz init script

---8<...
if [ "${MODULES_DISABLED}" != "yes" ]; then
PRELOAD_MODULES="af_packet"
MODULES="vzmon vzdquota vzdev"
----> #CPT_MODULES="vzcpt vzrst" <----
MODULES_OTHER="vzcompat ${CPT_MODULES}"
---8<...

or add a directive, in /etc/vz/vz.conf

---8<...
MIGRATION="no"
---8<...

and a patched vz init.d script:

--- /etc/init.d/vz 2009-09-29 09:24:36.336995392 +0200
+++ /etc/init.d/vz-new 2009-09-29 09:26:31.398503384 +0200
@@ -60,7 +60,9 @@
if [ "${MODULES_DISABLED}" != "yes" ]; then
PRELOAD_MODULES="af_packet"
MODULES="vzmon vzdquota vzdev"
- CPT_MODULES="vzcpt vzrst"
+ if [ "${MIGRATION}" != "no" ]; then
+ CPT_MODULES="vzcpt vzrst"
+ fi
MODULES_OTHER="vzcompat ${CPT_MODULES}"
VNET_MODULES="vznetdev vznet"
VETH_MODULES="vzethdev"

Bye,
Thorsten

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