DaemonSet

What is Daemonset ? K8s feature allows single copy of pod running on each node in cluster all time.

only single copy of pod per node.

When new node added to cluster there is single copy of pod deployed to new node [automatic].

When node evicted from cluster ———> pod will evicted from node[automatic].

Use cases?

Logging agent

monitoring agent

networking agent [waevenet]

Examples ————>

kube-proxy deployed as daemonset

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How to list daemonsets ?

$ kubectl get daemonsets

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Deploy a DaemonSet for FluentD Logging.

Name: elasticsearch

Namespace: kube-system

Image: registry.k8s.io/fluentd-elasticsearch:1.20

apiVersion: apps/v1

kind: DaemonSet

metadata:

name: elasticsearch

namespace: kube-system

spec:

selector:

matchLabels:

app: Tier1

template:

metadata:

labels:

app: Tier1

spec:

containers:

- name: c1

image: registry.k8s.io/fluentd-elasticsearch:1.20

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