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Kubernetes

Explained Kubernetes DaemonSet with Example

March 24, 2021 comments off

Creating a Kubernetes DaemonSet

Let’s use a simple DaemonSet for Apache HTTP server to illustrate this

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: logging
spec:
  selector:
    matchLabels:
      app: httpd-logging
  template:
    metadata:
      labels:
        app: httpd-logging
    spec:
      containers:
        - name: webserver
          image: httpd
          ports:
          - containerPort: 80
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
terminationGracePeriodSeconds: 30
volumes:
- name: varlog
hostPath:
path: /var/log
view raw DaemonSet.yaml hosted with ❤ by GitHub
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: logging
spec:
selector:
matchLabels:
app: httpd-logging
template:
metadata:
labels:
app: httpd-logging
spec:
containers:
- name: webserver
image: httpd
ports:
- containerPort: 80
view raw DaemonSet1.yaml hosted with ❤ by GitHub

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