4 11 2015
Openshift 3 : My node can’t spaw more than 40 pods, why ?
talset | ansible, debug, devops, docker, openshift3, redhat |
If you deploy a lot of pods on each nodes, you might faced to an ressource error. Openshift 3 have a limits set on how many pods can be run on a node by default ?
The answer is yes, by default the limits is 40 pods per node. It can be to low for some usage so i recommend you to increase to 100.
How can i increase the limit ?
On each nodes you have to edit node-config.yaml and add the kubeletArguments section with thoses params :
kubeletArguments:
max-pods:
- "100"
/etc/openshift/node/node-config.yaml
and of course restart your openshift-node service.
It is possible to use ansible for that
#Update max-pods in node-config.yaml max-pods 100
- name: Add kubeletArguments section in node-config.yaml
lineinfile:
dest: /etc/openshift/node/node-config.yaml
line: 'kubeletArguments:'
tags:
- openshift-node
- name: Add max-pods in node-config.yaml
lineinfile:
dest: /etc/openshift/node/node-config.yaml
regexp: "{{ item.regexp }}"
line: "{{ item.line }}"
insertafter: "{{ item.insertafter }}"
with_items:
- { line: " max-pods:", regexp: '^ max-pods:$', insertafter: "^kubeletArguments:$"}
- { line: " - \"100\"", regexp: ' - "[0-9]+"', insertafter: "^ max-pods:$"}
tags:
- openshift-node
notify:
- restart openshift-node
ansible task
- name: restart openshift-node
service: name=openshift-node state=restarted
ansible handler
ansible, debug, docker, kubernate, openshift3, redhat
