Difference between revisions of "Kubernetes DaemonSets"
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== Official example == | == Official example == | ||
https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/ | https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/ | ||
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| − | + | apiVersion: apps/v1 | |
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| − | template: | + | kind: DaemonSet |
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| − | + | metadata: | |
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| − | + | name: fluentd-elasticsearch | |
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| − | + | namespace: kube-system | |
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| − | + | labels: | |
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| − | + | k8s-app: fluentd-logging | |
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| + | spec: | ||
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| + | selector: | ||
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| + | matchLabels: | ||
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| + | name: fluentd-elasticsearch | ||
| + | |||
| + | template: | ||
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| + | metadata: | ||
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| + | labels: | ||
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| + | name: fluentd-elasticsearch | ||
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| + | spec: | ||
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| + | [[tolerations:]] | ||
# these tolerations are to have the daemonset runnable on control plane nodes | # these tolerations are to have the daemonset runnable on control plane nodes | ||
# remove them if your control plane nodes should not run pods | # remove them if your control plane nodes should not run pods | ||
| − | + | <pre> | |
- key: node-role.kubernetes.io/control-plane | - key: node-role.kubernetes.io/control-plane | ||
Revision as of 13:52, 25 August 2022
Kubernetes Daemonset can be used to run replicas of a pod on specific or all node.
Typical uses of a DaemonSet are:
- Running a cluster storage daemon on every node
- Running a logs collection daemon on every node
- Running a node monitoring daemon on every node
Official example
https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: fluentd-elasticsearch
namespace: kube-system
labels:
k8s-app: fluentd-logging
spec:
selector:
matchLabels:
name: fluentd-elasticsearch
template:
metadata:
labels:
name: fluentd-elasticsearch
spec:
tolerations:
# these tolerations are to have the daemonset runnable on control plane nodes
# remove them if your control plane nodes should not run pods
- key: node-role.kubernetes.io/control-plane
operator: Exists
effect: NoSchedule
- key: node-role.kubernetes.io/master
operator: Exists
effect: NoSchedule
containers:
- name: fluentd-elasticsearch
image: quay.io/fluentd_elasticsearch/fluentd:v2.5.2
resources:
limits:
memory: 200Mi
requests:
cpu: 100m
memory: 200Mi
volumeMounts:
- name: varlog
mountPath: /var/log
- name: varlibdockercontainers
mountPath: /var/lib/docker/containers
readOnly: true
terminationGracePeriodSeconds: 30
volumes:
- name: varlog
hostPath:
path: /var/log
- name: varlibdockercontainers
hostPath:
path: /var/lib/docker/containers
Activities
- CKA v1.18: Understand the role of DaemonSets
Related terms
See also
Advertising:
