In 3.6 you can look at which master is using the most memory (the passive controllers won’t use much at all).
You can also do a GET /controllers against :8444 which returns 200 if this is the active controller, or 404 (iirc) otherwise. That’s been removed though in newer versions in favor of the election annotations. > On Feb 21, 2018, at 12:49 AM, Srinivas Naga Kotaru (skotaru) > <skot...@cisco.com> wrote: > > Thanks, that make sense. We are using 3.6 currently > > -- > > Srinivas Kotaru > On 2/20/18, 9:46 PM, "Takayoshi Kimura" <tkim...@redhat.com> wrote: > > In 3.7+ "oc get cm openshift-master-controllers -n kube-system -o yaml" > you can see the annotation described in that article. > > Regards, > Takayoshi > > On Wed, 21 Feb 2018 14:37:32 +0900, > "Srinivas Naga Kotaru (skotaru)" <skot...@cisco.com> wrote: >> >> It has just client-ca-file. We have 3 masters in each cluster. not sure how >> to identify which control manager is active? I usually find which oneʼs is >> writing logs by using journalctl >> atomic-openshift-master-controllers.service. passive oneʼs donʼt write or >> generate >> any logs. >> >> -- >> >> Srinivas Kotaru >> >> From: Clayton Coleman <ccole...@redhat.com> >> Date: Tuesday, February 20, 2018 at 9:29 PM >> To: Srinivas Naga Kotaru <skot...@cisco.com> >> Cc: dev <dev@lists.openshift.redhat.com> >> Subject: Re: Leader election in Kubernetes control plane >> >> We use config maps - check in kube-system for that. >> >> On Feb 15, 2018, at 2:48 PM, Srinivas Naga Kotaru (skotaru) >> <skot...@cisco.com> wrote: >> >> while I was reading below article, I tried to do the same to find out >> which one is active control plane in Openshift. I could see zero end points >> in kube-system name space. Am I missing something or not implemented in >> Openshift? >> >> >> https://blog.heptio.com/leader-election-in-kubernetes-control-plane-heptioprotip-1ed9fb0f3e6d >> >> $oc project >> >> Using project "kube-system" on server >> >> $ oc get ep >> >> No resources found. >> >> $oc get all >> >> No resources found. >> >> -- >> >> Srinivas Kotaru >> >> _______________________________________________ >> dev mailing list >> dev@lists.openshift.redhat.com >> http://lists.openshift.redhat.com/openshiftmm/listinfo/dev >> >> _______________________________________________ >> dev mailing list >> dev@lists.openshift.redhat.com >> http://lists.openshift.redhat.com/openshiftmm/listinfo/dev > > _______________________________________________ dev mailing list dev@lists.openshift.redhat.com http://lists.openshift.redhat.com/openshiftmm/listinfo/dev
