Deployment 部署的副本 Pod 会分布在各个 Node 上，每个 Node 都可能运行好几个副本。DaemonSet 的不同之处在于：每个 Node 上最多只能运行一个副本。
主要区别
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The scalability is much better when using a Deployment, because you will have a Single-Pod-per-Node model when using the DaemonSet.
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It is possible to exclusively run a Service on a dedicated set of machines using taints and tolerations with a DaemonSet.
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On the other hand the DaemonSet allows you to access any Node directly on Port 80 and 443, where you have to setup a Service object with a Deployment.
DaemonSet 的典型应用场景有
- 在集群的每个节点上运行存储 Daemon，比如 glusterd 或 ceph
- 在每个节点上运行日志收集 Daemon，比如 flunentd 或 logstash
- 在每个节点上运行监控 Daemon，比如 Prometheus Node Exporter 或 collectd
