Wido - Looks like the problem resides in the logic that does the detection of the host resources. It looks like most, if not all, the KVM host detection occurs in the LibvirtComputingResource class. Here I can modify it so it will take the value stored in dom0MinMem into account when calculating the ram available.
I've forked the repo and am working on a fix. Does anyone have anything to add? Suggestions? ________________________________________ From: Wido den Hollander <w...@widodh.nl> Sent: Friday, August 28, 2015 12:38 AM To: dev@cloudstack.apache.org Subject: Re: Discuss reserving memory on KVM hypervisors ref: CLOUDSTACK-8678 Josh Harshman Cloud Engineer Intrinium On 27-08-15 18:36, Josh Harshman wrote: > In a KVM cluster, CloudStack sees 100% of the compute node's RAM and treats > it as allocatable space which eventually leads to OOM killing guests. > > > There is an agent property named host.reserved.mem.mb which is able to be set > in the agent.properties file and passed to the management server. This value > is stored as dom0MinMem, however, it appears to be ignored. > > > If we could tweak the host capacity calculation and have it take this into > account, I believe that would be ideal. > > > Side note: the variable dom0MinMem is declared as an int and can be > overflowed. Suggested change would be make it a long and add a check > especially if we are going to make this a configurable parameter. > > Yes, that seems like a sane thing to do. We should be able to say that eg 8GB of memory should stay available for the HV. Don't know where the problem lies though. A PR is welcome :) Wido > > > Josh Harshman > > Cloud Engineer > > > Intrinium > Tel: (509) 465-1234 x5259 > Fax: (866) 565-4578 > Lync / Skype: josh.harsh...@intrinium.com > Web: http://intrinium.com<http://intrinium.com/> > > > [Intrinium Long Sig Logo]<http://intrinium.com/> > > > [Facebook]<http://www.facebook.com/pages/intrinium/154891544582822> [Twitter] > <http://twitter.com/intrinium> [Linkedin] > <http://www.linkedin.com/company/intrinium_networks_it_security?trk=fc_badge> > [Youtube] <http://www.youtube.com/user/intrinium> [Blog] > <http://intrinium.com/blog/> > > Information Security and Compliance Consulting | Managed IT and Security > Services | Cloud Services > > > > > > ________________________________ > > This email and any files transmitted with it are confidential and intended > solely for the use of the individual or entity to whom they are addressed. If > you have received this email in error please notify the system manager. This > message contains confidential information and is intended only for the > individual named. If you are not the named addressee you should not > disseminate, distribute or copy this e-mail. Please notify the sender > immediately by e-mail if you have received this e-mail by mistake and delete > this e-mail from your system. If you are not the intended recipient you are > notified that disclosing, copying, distributing or taking any action in > reliance on the contents of this information is strictly prohibited. >
