I have only 1 node with multiple processors and a lot of memory. I actually did this on purpose to eliminate the "how are the pods distributed on nodes" variable. I tail the application logs of the 4 pods at the same time, that's how I noticed the uneven distribution. Also, in my response from the pod, I added the "hostname", and printing it out in the pod that issues the requests. The troubling issue is that if I send a lot of requests in fast succession (in a loop), they ALL go to the same pod, there is no distribution at all.
On Fri, Apr 13, 2018 at 10:16 AM, Rodrigo Campos <rodrig...@gmail.com> wrote: > Why are obviously not evenly distributed? How are pods asgined to nodes? > > And also, how do you noticed, exactly, that they are not "evenly > distributed"? > > On Friday, April 13, 2018, <cristian.coch...@gmail.com> wrote: > >> >> I have a ClusterIP service in my cluster with 4 pods behind it. I noticed >> that requests to the service are not evenly distributed among pods. After >> further reading I learned that the kube-proxy pod is responsible for >> setting up the iptables rules that forward requests to the pods. After >> logging into the kube-proxy pod and listing the nat table rules, this is >> what I got: >> >> Chain KUBE-SVC-4F4JXO37LX4IKRUC (1 references) >> target prot opt source destination >> KUBE-SEP-6X4IVU3LDAAZJUPD all -- 0.0.0.0/0 0.0.0.0/0 >> /* default/btm-calculator: */ statistic mode random probability >> 0.25000000000 >> KUBE-SEP-TXRPWWIIUWW3MNFH all -- 0.0.0.0/0 0.0.0.0/0 >> /* default/btm-calculator: */ statistic mode random probability >> 0.33332999982 >> KUBE-SEP-HW6SF2LJM4S7X5ZN all -- 0.0.0.0/0 0.0.0.0/0 >> /* default/btm-calculator: */ statistic mode random probability >> 0.50000000000 >> KUBE-SEP-TTJKD52QZSH2OH4O all -- 0.0.0.0/0 0.0.0.0/0 >> /* default/btm-calculator: */ >> >> The comments seem to suggest that the load is balanced according to the >> static mode random probability with an uneven probability distribution. Is >> this how it's supposed to work? Every piece of documentation that I read >> about load balancing by a ClusterIP service indicates that it should be >> round robin. Obviously this is not the case here. >> Is there a way to set a ClusterIP to perform round robin load balancing? >> >> Thank you, >> Cristian >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Kubernetes user discussion and Q&A" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to kubernetes-users+unsubscr...@googlegroups.com. >> To post to this group, send email to kubernetes-users@googlegroups.com. >> Visit this group at https://groups.google.com/group/kubernetes-users. >> For more options, visit https://groups.google.com/d/optout. >> > -- > You received this message because you are subscribed to a topic in the > Google Groups "Kubernetes user discussion and Q&A" group. > To unsubscribe from this topic, visit https://groups.google.com/d/ > topic/kubernetes-users/lvfyKzUf-Vg/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > kubernetes-users+unsubscr...@googlegroups.com. > To post to this group, send email to kubernetes-users@googlegroups.com. > Visit this group at https://groups.google.com/group/kubernetes-users. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Kubernetes user discussion and Q&A" group. To unsubscribe from this group and stop receiving emails from it, send an email to kubernetes-users+unsubscr...@googlegroups.com. To post to this group, send email to kubernetes-users@googlegroups.com. Visit this group at https://groups.google.com/group/kubernetes-users. For more options, visit https://groups.google.com/d/optout.
