Moby: Debian stock kernel doesn't support limiting memory
Docker testing harness fails in Debian as its kernel does not support cgroup memory limitation. Although the following patch in the Debian kernel config will enable named support, this is not yet part of the official kernel package
--- /boot/config-3.2.0-4-amd64 2013-02-27 01:21:37.000000000 -0800
+++ config-3.2.0-4-amd64 2013-04-02 19:23:20.661887146 -0700
@@ -128,9 +128,9 @@
CONFIG_CGROUP_CPUACCT=y
CONFIG_RESOURCE_COUNTERS=y
CONFIG_CGROUP_MEM_RES_CTLR=y
-CONFIG_CGROUP_MEM_RES_CTLR_DISABLED=y
+# CONFIG_CGROUP_MEM_RES_CTLR_DISABLED is not set
CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y
-# CONFIG_CGROUP_MEM_RES_CTLR_SWAP_ENABLED is not set
+CONFIG_CGROUP_MEM_RES_CTLR_SWAP_ENABLED=y
CONFIG_CGROUP_PERF=y
CONFIG_CGROUP_SCHED=y
CONFIG_FAIR_GROUP_SCHED=y
mzdaniel
All 7 comments
This issue relates with packaging issue #251
mzdaniel
on 11 Apr 2013
This should probably be reported to the Debian project so they can fix it.
unclejack
on 11 Apr 2013
@creack: It works. Thank you!
mzdaniel
on 12 Apr 2013
@unclejack: I did more research on this to present it to Debian, and it turns out that although the stock kernel doesn't support limiting memory, it does support setting kernel boot parameters to enable it. The parameter settings are:
cgroup_enable=memory swapaccount=1
In summary for this issue, Debian users can fully enjoy docker passing all its tests with standard Wheesy kernel adding the following parameters into their /boot/grub/grub.cfg:
linux /boot/vmlinuz-3.2.0-4-amd64 [other parameters] cgroup_enable=memory swapaccount=1
This implies that with good documentation, Debian Wheesy with no special packages fully support Docker
mzdaniel
on 16 Apr 2013
Crossposting this issue to the Debian docker package, issue #251
mzdaniel
on 16 Apr 2013
just for information to anyone coming here, the standard way in debian to add these options if you want them to persist when the kernel package is updated or the initrd is regenerated, is to add them to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub
soul9
on 9 Jun 2013
for any other poor non-bearded noobs like me wondering how to do this...
http://askubuntu.com/a/19487/62915
- add
cgroup_enable=memory swapaccount=1to whatever is currently in theGRUB_CMDLINE_LINUX_DEFAULTvar in/etc/default/grub sudo update-grubto make it ready to use- restart the instance, should be working
anentropic
on 3 Feb 2016
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Most helpful comment
for any other poor non-bearded noobs like me wondering how to do this...
http://askubuntu.com/a/19487/62915
cgroup_enable=memory swapaccount=1to whatever is currently in theGRUB_CMDLINE_LINUX_DEFAULTvar in/etc/default/grubsudo update-grubto make it ready to use