红帽全球峰会This documentation is for a release that is no longer maintained
See documentation for the latest supported version 3 or the latest supported version 4.第 4 章 OpenShift Container Platform 中的 DNS Operator
DNS Operator 部署并管理 CoreDNS，以便为 Pod 提供名称解析服务，从而在 OpenShift 中启用基于 DNS 的 Kubernetes 服务发现。
4.1. DNS Operator
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DNS Operator 从 operator.openshift.io API 组实现 dns API。Operator 使用 DaemonSet 部署 CoreDNS，为 DaemonSet 创建服务，并将 kubelet 配置为指示 Pod 使用 CoreDNS 服务 IP 进行名称解析。
流程
在安装过程中，DNS Operator 被部署为一个 Kubernetes 部署。
使用
oc get命令来查看部署状态：oc get -n openshift-dns-operator deployment/dns-operator
$ oc get -n openshift-dns-operator deployment/dns-operatorCopy to Clipboard Copied! Toggle word wrap Toggle overflow 输出示例
NAME READY UP-TO-DATE AVAILABLE AGE dns-operator 1/1 1 1 23h
NAME READY UP-TO-DATE AVAILABLE AGE dns-operator 1/1 1 1 23hCopy to Clipboard Copied! Toggle word wrap Toggle overflow ClusterOperator 是存放 Operator 当前状态的自定义资源对象。Operator 使用这个对象将其状态传递给集群的其余部分。
使用
oc get命令来查看 DNS Operator 的状态：oc get clusteroperator/dns
$ oc get clusteroperator/dnsCopy to Clipboard Copied! Toggle word wrap Toggle overflow 输出示例
NAME VERSION AVAILABLE PROGRESSING DEGRADED SINCE dns 4.1.0-0.11 True False False 92m
NAME VERSION AVAILABLE PROGRESSING DEGRADED SINCE dns 4.1.0-0.11 True False False 92mCopy to Clipboard Copied! Toggle word wrap Toggle overflow AVAILABLE、PROGRESSING和DEGRADED提供了有关 Operator 状态的信息。当 CoreDNS DaemonSet 中至少有 1 个 Pod 报告了Available状态时，AVAILABLE为True。
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