I want to deploy a DaemonSet for monitoring purpose. So these Pods need to be deployed in all Nodes.
A DaemonSet ensures that all (or some) Nodes run a copy of a Pod.
I am using a DaemonSet so that all nodes get a copy.
spec:
containers:
- name: fluentd
image: aerocloud.io/containers/fluentd:0.0.1
volumeMounts:
- name: varlog
mountPath: /var/log
volumes:
- name: varlog
hostPath:
path: /var/log
When I'm creating this DaemonSet
in my Kubernetes cluster, I don't see Pod running in my master node.
Pod for this DaemonSet are running in all nodes except Master node.
What am I missing here? How can I enforce scheduler to schedule a Pod in Master node?
Security pods are not scheduled since the master nodes do not meet the required memory or CPU requirements. The output has the information about memory and CPU requirements. If the resource requirement is not met, increase the master node's memory or CPU.
A DaemonSet ensures that all (or some) Nodes run a copy of a Pod. I am using a DaemonSet so that all nodes get a copy. When I'm creating this DaemonSet in my Kubernetes cluster, I don't see Pod running in my master node. Pod for this DaemonSet are running in all nodes except Master node.
If you want to be able to schedule pods on the Kubernetes control-plane node, you need to remove a taint on the master nodes. This will remove the node-role.kubernetes.io/master taint from any nodes that have it, including the control-plane node, meaning that the scheduler will then be able to schedule pods everywhere.
Put security on gate: Apply taint on node Above command places a taint on node “<node-name>”. The taint has key “type”, value “db”, and taint effect “NoSchedule”. This means that no pod will be scheduled on node <node-name> unless it has a matching toleration.
Since Kubernetes 1.6, DaemonSets do not schedule on master nodes by default. In order to schedule it on master, you have to add a toleration into the Pod spec section:
tolerations:
- key: node-role.kubernetes.io/master
effect: NoSchedule
For more details, check out the example YAML files in Kubernetss DeamonSet docu. It is also mentioned in the chapter How Daemon Pods are Scheduled.
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