Re:The Basics: Kubernetes, Mesosphere, and Docker Swarm
by Artemis2 on Thursday February 16, 2017 @03:46AM
(#13658513)
This is right on point with our experience. Kubernetes is great tech but it could be smarter with respect to scheduling decisions.
Docker is always packed full of bugs; we had to increase redundancy everywhere in our stack. It's consistently been the source for me getting paged at night, and now it's the first thing I look at when there is a new issue. Some components I feel could fail more easily: our etcd and Consul clusters have been chugging along fore more than a year, even though they solve a problem much more complex than Docker does. Docker has been "production-ready" for years now, but I would not recommend it. The developers always fix that critical, production-affecting bug in the next release, but it's been disappointing for some time. I look forward to rkt + Kubernetes getting more mature.
> - once a pod has been scheduled onto a node, it never reschedules it anywhere else. The node may be experiencing problems, thus the pod is affected. k8s doesn't do anything to heal that -- it could simply delete the pod so it is rescheduled somewhere else.
IIRC, if a node goes from NodeReady to NodeNotReady, pods are drained from it.
Docker is always packed full of bugs; we had to increase redundancy everywhere in our stack. It's consistently been the source for me getting paged at night, and now it's the first thing I look at when there is a new issue. Some components I feel could fail more easily: our etcd and Consul clusters have been chugging along fore more than a year, even though they solve a problem much more complex than Docker does. Docker has been "production-ready" for years now, but I would not recommend it. The developers always fix that critical, production-affecting bug in the next release, but it's been disappointing for some time. I look forward to rkt + Kubernetes getting more mature.
> - once a pod has been scheduled onto a node, it never reschedules it anywhere else. The node may be experiencing problems, thus the pod is affected. k8s doesn't do anything to heal that -- it could simply delete the pod so it is rescheduled somewhere else.
IIRC, if a node goes from NodeReady to NodeNotReady, pods are drained from it.