How do I use a node selector with a build config in openshift?

Question

I am running a large world spanning openshift cluster. When I run a build from a BuildConfig it will randomly assign the build to any node in the entire cluster. This is problematic as many regions have higher latency which dramatically slows down build times and image uploads. I can't find any information in the documentation on using node selector tags at this level. I have tried adding openshift.io/node-selector: dc=mex01 to the annotations as it is done with project level node-selectors to no avail. Any help would be great. Thanks!

Project node selectors should apply to build pods - please open an issue at https://github.com/openshift/origin/issues/new so we can debug — Clayton, May 04 '16 at 23:35
I just wanted to check that project node selectors were the only way and that seems to be the case. Thanks! — Timothy Allen, May 17 '16 at 16:01
This question is a duplicate of http://stackoverflow.com/questions/36511443/running-builds-on-a-specific-dedicated-node-set :) — Danielle Madeley, Oct 24 '16 at 00:00

score 0 · Accepted Answer · answered May 17 '16 at 16:03

0

Project node selectors are the only way to control where builds happen at the present time.

answered May 17 '16 at 16:03

Timothy Allen

21
3

This is now possible on Build Configs since Origin 1.3: https://docs.openshift.org/latest/dev_guide/builds.html#dev-guide-assigning-builds-to-nodes – Lionel Orellana Dec 13 '16 at 06:15

score 0 · Answer 2 · answered Mar 23 '17 at 12:44

0

Since this is the Question that shows up first on Google:

This is now possible (since 1.3 apparently): https://docs.openshift.org/latest/dev_guide/builds/advanced_build_operations.html#dev-guide-assigning-builds-to-nodes

answered Mar 23 '17 at 12:44

mhutter

2,800
22
30

score 0 · Answer 3 · answered Aug 18 '17 at 11:32

To elaborate a bit on mhutter's answer, here are example yaml fragments using node selectors:

a BuildConfig:

apiVersion: "v1"
kind: "BuildConfig"
metadata:
  name: "sample-build"
spec:
  nodeSelector:
    canbuild: yes

and a Node:

apiVersion: v1
kind: Node
metadata:
  creationTimestamp: null
  labels:
    beta.kubernetes.io/arch: amd64
    beta.kubernetes.io/os: linux
    kubernetes.io/hostname: mybestnodeever
    canbuild: yes

Since OCPv3.6 there are the taints and tolerations, which can be applied to nodes and pods, but I haven't yet found any docs on applying tolerations to the build configs (or on whether they propagate to the builder pods). https://docs.openshift.com/container-

How do I use a node selector with a build config in openshift?

3 Answers3