{"id":35917,"date":"2023-10-22T07:29:13","date_gmt":"2023-12-12T12:29:39","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/kubernetes1-10-cluster%e5%86%85dns%e3%81%ae%e6%8c%99%e5%8b%95%e7%a2%ba%e8%aa%8d\/"},"modified":"2024-05-04T05:27:52","modified_gmt":"2024-05-03T21:27:52","slug":"kubernetes1-10-cluster%e5%86%85dns%e3%81%ae%e6%8c%99%e5%8b%95%e7%a2%ba%e8%aa%8d","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/kubernetes1-10-cluster%e5%86%85dns%e3%81%ae%e6%8c%99%e5%8b%95%e7%a2%ba%e8%aa%8d\/","title":{"rendered":"Kubernetes1.10 Cluster\u5185DNS\u306e\u6319\u52d5\u78ba\u8a8d"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>Kubernetes\u306e\u516c\u5f0f\u30da\u30fc\u30b8\u306b\u3001\u591a\u304f\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u304c\u63b2\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\nKubernetes\u306e\u52c9\u5f37\u306e\u4e00\u74b0\u3067\u3001\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3092\u6d88\u5316\u3057\u3066\u3044\u304d\u307e\u3059\u3002<br \/>\n\u4eca\u56de\u306f Kubernetes\u30af\u30e9\u30b9\u30bf\u5185\u90e8\u3067\u4f7f\u7528\u3059\u308bDNS\u3092\u52c9\u5f37\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h1>\u901a\u5e38\u306eService\u306e\u540d\u524d\u89e3\u6c7a<\/h1>\n<p>Kubernetes\u30af\u30e9\u30b9\u30bf\u306e\u3059\u3079\u3066\u306e\u30b5\u30fc\u30d3\u30b9\u306f\u3001DNS\u540d\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u3066\u3044\u307e\u3059\u3002Kubernetes\u304cPod\u3092\u4f5c\u6210\u3057\u305f\u6642\u306b\u3001Pod\u5185\u90e8\u306e \/etc\/resolv.conf \u306b\u3001\u30cd\u30fc\u30e0\u30b9\u30da\u30fc\u30b9\u3068\u30c7\u30d5\u30a9\u30eb\u30c8\u30c9\u30e1\u30a4\u30f3\u304c\u542b\u307e\u308c\u305f search list \u304c\u81ea\u52d5\u7684\u306b\u8a2d\u5b9a\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>\u540c\u4e00\u30cd\u30fc\u30e0\u30b9\u30da\u30fc\u30b9\u5185\u3067\u540d\u524d\u89e3\u6c7a(PodtoService)<\/h2>\n<p>Service\u540d\u304c foo1 \u3067 Namespace\u304c bar \u306e\u3082\u306e\u3092\u4f5c\u6210\u3057\u3066\u3001\u52d5\u4f5c\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<p>\u9996\u5148\uff0c\u521b\u5efa\u4e00\u4e2a\u540d\u4e3a&#8221;\u547d\u540d\u7a7a\u95f4\u680f&#8221;\u7684\u6761\u76ee\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 ~(default kubernetes-admin)]# kubectl create namespace bar\r\nnamespace \"bar\" created\r\n<\/code><\/pre>\n<p>kubens\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001bar \u30cd\u30fc\u30e0\u30b9\u30da\u30fc\u30b9\u3078\u5207\u308a\u66ff\u3048\u307e\u3059<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 ~(default kubernetes-admin)]# kubens bar\r\nContext \"kubernetes-admin@kubernetes\" modified.\r\nActive namespace is \"bar\".\r\n[root@sugi-kubernetes110-master01 ~(bar kubernetes-admin)]# \r\n<\/code><\/pre>\n<p>\u4e3a\u4e86\u521b\u5efaCentOS\u7684Pod\uff0c\u751f\u6210\u4ee5\u4e0b\u6e05\u5355\u6587\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code>cat &lt;&lt;'EOF' &gt; \/root\/kube_yaml\/dns\/centos_pod.yaml\r\napiVersion: apps\/v1 # for versions before 1.9.0 use apps\/v1beta2\r\nkind: Deployment\r\nmetadata:\r\n  name: centos\r\nspec:\r\n  selector:\r\n    matchLabels:\r\n      app: centos\r\n  replicas: 2\r\n  template:\r\n    metadata:\r\n      labels:\r\n        app: centos\r\n    spec:\r\n      containers:\r\n      - name: centos\r\n        image: centos\r\n        command: [ \"sleep\", \"3600\" ]\r\nEOF\r\n<\/code><\/pre>\n<p>\u521b\u5efaCentOS\u7684Pod<\/p>\n<pre class=\"post-pre\"><code>kubectl create -f \/root\/kube_yaml\/dns\/centos_pod.yaml\r\n<\/code><\/pre>\n<p>\u6211\u67e5\u770b\u4e00\u4e0bPod\u6e05\u5355\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 ~(bar kubernetes-admin)]# kubectl get pod -o wide \r\nNAME                     READY     STATUS        RESTARTS   AGE       IP            NODE\r\ncentos-749b5dff6-hhhnr   1\/1       Running       0          32s       10.244.1.26   sugi-kubernetes110-node01.localdomain\r\ncentos-749b5dff6-xwdfw   1\/1       Running       0          32s       10.244.2.24   sugi-kubernetes110-node02.localdomain\r\n<\/code><\/pre>\n<p>\u6b21\u306b Service foo1 \u3092\u4f5c\u6210\u3057\u307e\u3059<\/p>\n<pre class=\"post-pre\"><code>cat &lt;&lt;'EOF' &gt; \/root\/kube_yaml\/dns\/foo1_service.yaml\r\napiVersion: v1\r\nkind: Service\r\nmetadata:\r\n  name: foo1\r\n  labels:\r\n    app: foo1\r\nspec:\r\n  ports:\r\n  - protocol: TCP\r\n    name: foo1portname\r\n    port: 6379\r\n    targetPort: 6380\r\n  selector:\r\n    app: foo1\r\nEOF\r\n<\/code><\/pre>\n<p>Service\u3092\u4f5c\u6210\u3057\u307e\u3059<\/p>\n<pre class=\"post-pre\"><code>kubectl create -f \/root\/kube_yaml\/dns\/foo1_service.yaml\r\n<\/code><\/pre>\n<p>\u6211\u4f1a\u67e5\u770b\u670d\u52a1\u5217\u8868\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 ~(bar kubernetes-admin)]# kubectl get svc -o wide --all-namespaces\r\nNAMESPACE     NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)         AGE       SELECTOR\r\nbar           foo1         ClusterIP   10.109.77.128   &lt;none&gt;        6379\/TCP        3m        app=foo1\r\ndefault       kubernetes   ClusterIP   10.96.0.1       &lt;none&gt;        443\/TCP         3d        &lt;none&gt;\r\nkube-system   kube-dns     ClusterIP   10.96.0.10      &lt;none&gt;        53\/UDP,53\/TCP   3d        k8s-app=kube-dns\r\n<\/code><\/pre>\n<p>\u786e\u8ba4\u670d\u52a1\u7684\u8be6\u7ec6\u4fe1\u606f<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 ~(bar kubernetes-admin)]# kubectl describe svc foo1 \r\nName:              foo1\r\nNamespace:         bar\r\nLabels:            app=foo1\r\nAnnotations:       &lt;none&gt;\r\nSelector:          app=foo1\r\nType:              ClusterIP\r\nIP:                10.109.77.128\r\nPort:              foo1portname  6379\/TCP\r\nTargetPort:        6380\/TCP\r\nEndpoints:         &lt;none&gt;\r\nSession Affinity:  None\r\nEvents:            &lt;none&gt;\r\n<\/code><\/pre>\n<p>CentOS\u306eshell\u3078\u30ed\u30b0\u30a4\u30f3\u3057\u307e\u3059<\/p>\n<pre class=\"post-pre\"><code>kubectl exec -it centos-749b5dff6-hhhnr bash\r\n<\/code><\/pre>\n<p>nslookup\u53ca\u3073dig\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u307e\u3059<\/p>\n<pre class=\"post-pre\"><code>yum install bind-utils\r\n<\/code><\/pre>\n<p>\u6211\u4eec\u4f1a\u68c0\u67e5 resolv.conf \u6587\u4ef6<br \/>\nkube-dns \u670d\u52a1\u7684 ClusterIP \u88ab\u7528\u4f5c nameserver\u3002<br \/>\n\u6b64\u5916\uff0csearch \u4e5f\u4ee5 namespace \u540d\u79f0.svc.\u9ed8\u8ba4\u57df\u540d \u7684\u5f62\u5f0f\u5b9a\u4e49\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@centos-749b5dff6-hhhnr \/]# cat \/etc\/resolv.conf \r\nnameserver 10.96.0.10\r\nsearch bar.svc.cluster.local svc.cluster.local cluster.local localdomain\r\noptions ndots:5\r\n<\/code><\/pre>\n<p>\u5f53\u5bf9 foo1 \u8fdb\u884c nslookup \u64cd\u4f5c\u65f6\uff0c\u53ef\u4ee5\u8fdb\u884c\u540d\u79f0\u89e3\u6790\u3002<br \/>\n\u4e0e bar \u547d\u540d\u7a7a\u95f4\u4e2d\u7684 foo1 \u670d\u52a1\u5173\u8054\u7684 ClusterIP \u53ef\u4ee5\u8fdb\u884c\u540d\u79f0\u89e3\u6790\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@centos-749b5dff6-hhhnr \/]# nslookup foo1\r\nServer:         10.96.0.10\r\nAddress:        10.96.0.10#53\r\n\r\nName:   foo1.bar.svc.cluster.local\r\nAddress: 10.109.77.128\r\n\r\n<\/code><\/pre>\n<p>IP\u30a2\u30c9\u30ec\u30b9\u306f\u308f\u304b\u308a\u307e\u3057\u305f\u304c\u3001ClusterIP\u306b\u7d10\u3065\u304f\u30dd\u30fc\u30c8\u756a\u53f7\u304c\u3001\u4e0a\u8a18\u3067\u306f\u78ba\u8a8d\u3067\u304d\u307e\u305b\u3093\u3002<br \/>\nKubernetes\u306eDNS\u3067\u306f\u3001\u30b5\u30fc\u30d3\u30b9\u306eIP\u30a2\u30c9\u30ec\u30b9\u306b\u7d10\u3065\u304f\u30dd\u30fc\u30c8\u756a\u53f7\u3092\u901a\u77e5\u3059\u308b\u305f\u3081\u3001SRV \u30ec\u30b3\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4e3a\u4e86\u5728Kubernetes\u4e2d\u4f7f\u7528SRV\u8bb0\u5f55\uff0c\u9700\u8981\u6309\u7167\u4e0b\u9762\u7684\u65b9\u5f0f\u6307\u5b9aService\u7684\u540d\u79f0\u548c\u534f\u8bae\u5b57\u6bb5\u3002<\/p>\n<pre class=\"post-pre\"><code>\u7565\r\nspec:\r\n  ports:\r\n  - protocol: TCP\r\n    name: foo1portname\r\n    port: 6379\r\n    targetPort: 6380\r\n\u7565\r\n<\/code><\/pre>\n<p>\u5982\u679c\u8981\u4f7f\u7528nslookup\u83b7\u53d6SRV\u8bb0\u5f55\u6765\u5bf9\u6b64\u8fdb\u884c\u64cd\u4f5c\uff0c\u60a8\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u547d\u4ee4\u4ee5\u5bf9\u8bdd\u65b9\u5f0f\u6267\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@centos-749b5dff6-hhhnr \/]# nslookup \r\n&gt; set type=SRV\r\n&gt; _foo1portname._tcp.foo1\r\nServer:         10.96.0.10\r\nAddress:        10.96.0.10#53\r\n\r\n_foo1portname._tcp.foo1.bar.svc.cluster.local   service = 10 100 6379 foo1.bar.svc.cluster.local.\r\n&gt; exit\r\n[root@centos-749b5dff6-hhhnr \/]# \r\n<\/code><\/pre>\n<p>\u540d\u524d\u89e3\u6c7a\u306e\u7d50\u679c\u3092\u78ba\u8a8d\u3059\u308b\u3068\u3001\u300cervice = 10 100 6379 foo1.bar.svc.cluster.local.\u300d\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<br \/>\n\u6570\u5b57\u306e\u610f\u5473\u306f\u4e0b\u8a18\u306e\u5185\u5bb9\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">10 : \u30d7\u30e9\u30a4\u30aa\u30ea\u30c6\u30a3<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">100 : \u30a6\u30a7\u30a4\u30c8<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">6379 : \u30dd\u30fc\u30c8\u756a\u53f7 (Service\u306eport\u3067\u6307\u5b9a\u3057\u305f\u756a\u53f7)<\/ul>\n<p>\u6574\u5408\u8d77\u6765\uff0c\u5982\u679cPod\u4e2d\u7684\u5e94\u7528\u7a0b\u5e8f\u60f3\u8981\u8bbf\u95ee\u53e6\u4e00\u4e2aPod\uff0c\u5219\u53ef\u4ee5\u8003\u8651\u4ee5\u4e0b\u4e24\u79cd\u60c5\u51b5\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Service\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u77e5\u308a\u305f\u3044\u5834\u5408 : \u300c\u30b5\u30fc\u30d3\u30b9\u540d\u300d\u3092\u4f7f\u7528\u3057\u3066Kubernetes\u306eDNS\u306b\u554f\u3044\u5408\u308f\u305b\u3059\u308b\u3053\u3068\u3067\u3001IP\u30a2\u30c9\u30ec\u30b9\u3092\u6b63\u5f15\u304d\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Service\u306eIP\u30a2\u30c9\u30ec\u30b9\u3068\u3001\u30dd\u30fc\u30c8\u756a\u53f7\u3092\u77e5\u308a\u305f\u3044\u5834\u5408 : \u300c\u30b5\u30fc\u30d3\u30b9\u540d\u300d\u300c\u30dd\u30fc\u30c8\u540d\u300d\u300c\u30d7\u30ed\u30c8\u30b3\u30eb\u300d\u3092\u4f7f\u7528\u3057\u3066Kubernetes\u306eDNS\u306b\u554f\u3044\u5408\u308f\u305b\u3059\u308b\u3053\u3068\u3067\u3001IP\u30a2\u30c9\u30ec\u30b9\u3068\u30dd\u30fc\u30c8\u756a\u53f7\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/ul>\n<h2>\u4ece\u53e6\u4e00\u4e2a\u547d\u540d\u7a7a\u95f4\u4e2d\u8fdb\u884c\u540d\u79f0\u89e3\u6790<\/h2>\n<p>\u521b\u5efa\u4e00\u4e2a\u540d\u4e3aquux\u7684\u547d\u540d\u7a7a\u95f4\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 ~(bar kubernetes-admin)]# kubectl create namespace quux\r\nnamespace \"quux\" created\r\n<\/code><\/pre>\n<p>\u30cd\u30fc\u30e0\u30b9\u30da\u30fc\u30b9\u306e\u5207\u308a\u66ff\u3048<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 ~(bar kubernetes-admin)]# kubens quux\r\nContext \"kubernetes-admin@kubernetes\" modified.\r\nActive namespace is \"quux\".\r\n[root@sugi-kubernetes110-master01 ~(quux kubernetes-admin)]# \r\n<\/code><\/pre>\n<p>\u521b\u5efaCentOS\u7684Pod<\/p>\n<pre class=\"post-pre\"><code>cat &lt;&lt;'EOF' &gt; \/root\/kube_yaml\/dns\/centos_pod.yaml\r\napiVersion: apps\/v1 # for versions before 1.9.0 use apps\/v1beta2\r\nkind: Deployment\r\nmetadata:\r\n  name: centos\r\nspec:\r\n  selector:\r\n    matchLabels:\r\n      app: centos\r\n  replicas: 1\r\n  template:\r\n    metadata:\r\n      labels:\r\n        app: centos\r\n    spec:\r\n      containers:\r\n      - name: centos\r\n        image: centos\r\n        command: [ \"sleep\", \"3600\" ]\r\nEOF\r\n<\/code><\/pre>\n<p>\u521b\u5efa\u90e8\u7f72<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 ~(quux kubernetes-admin)]# kubectl create -f \/root\/kube_yaml\/dns\/centos_pod.yaml\r\ndeployment.apps \"centos\" created\r\n<\/code><\/pre>\n<p>\u786e\u8ba4<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 ~(quux kubernetes-admin)]# kubectl get pods -o wide\r\nNAME                     READY     STATUS    RESTARTS   AGE       IP            NODE\r\ncentos-749b5dff6-plkc8   1\/1       Running   0          24s       10.244.2.25   sugi-kubernetes110-node02.localdomain\r\n<\/code><\/pre>\n<p>\u767b\u5f55\u5230bash<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 ~(quux kubernetes-admin)]# kubectl exec centos-749b5dff6-plkc8 -it bash\r\n[root@centos-749b5dff6-plkc8 \/]# \r\n<\/code><\/pre>\n<p>\u5b89\u88c5bind-utils<\/p>\n<pre class=\"post-pre\"><code>yum install -y bind-utils\r\n<\/code><\/pre>\n<p>resolv.conf\u3092\u78ba\u8a8d\u3057\u307e\u3059<br \/>\nquux \u30cd\u30fc\u30e0\u30b9\u30da\u30fc\u30b9\u306a\u306e\u3067\u3001search lust \u306b\u306f quux \u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059<\/p>\n<pre class=\"post-pre\"><code>[root@centos-749b5dff6-plkc8 \/]# cat \/etc\/resolv.conf \r\nnameserver 10.96.0.10\r\nsearch quux.svc.cluster.local svc.cluster.local cluster.local localdomain\r\noptions ndots:5\r\n<\/code><\/pre>\n<p>\u5982\u679c\u7701\u7565\u4e86\u540e\u7f00\uff0c\u65e0\u6cd5\u89e3\u6790 bar \u547d\u540d\u7a7a\u95f4\u4e2d\u7684 foo1\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@centos-749b5dff6-plkc8 \/]# nslookup foo1   \r\nServer:         10.96.0.10\r\nAddress:        10.96.0.10#53\r\n\r\n** server can't find foo1: NXDOMAIN\r\n\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u4f7f\u7528foo1.bar\uff0c\u53ef\u4ee5\u8fdb\u884c\u540d\u79f0\u89e3\u6790\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@centos-749b5dff6-plkc8 \/]# nslookup foo1.bar\r\nServer:         10.96.0.10\r\nAddress:        10.96.0.10#53\r\n\r\nName:   foo1.bar.svc.cluster.local\r\nAddress: 10.109.77.128\r\n<\/code><\/pre>\n<p>\u540c\u6837\uff0c\u60a8\u4e5f\u53ef\u4ee5\u83b7\u53d6SRV\u8bb0\u5f55\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@centos-749b5dff6-plkc8 \/]# nslookup \r\n&gt; set type=SRV\r\n&gt; _foo1portname._tcp.foo1.bar\r\nServer:         10.96.0.10\r\nAddress:        10.96.0.10#53\r\n\r\n_foo1portname._tcp.foo1.bar.svc.cluster.local   service = 10 100 6379 foo1.bar.svc.cluster.local.\r\n<\/code><\/pre>\n<p>\u80fd\u5426\u8bbf\u95ee\u5177\u6709\u4e0d\u540c\u547d\u540d\u7a7a\u95f4\u7684\u670d\u52a1\u53d6\u51b3\u4e8e\u4e0d\u540c\u7684\u8bbe\u7f6e\u3002<br \/>\n\u5982\u679c\u7f51\u7edc\u63d2\u4ef6\u901a\u8fc7NetworkPolicy\u8fdb\u884c\u9694\u79bb\uff0c\u90a3\u4e48\u5b83\u4eec\u5c06\u65e0\u6cd5\u901a\u4fe1\u3002<br \/>\n\u8bf7\u6ce8\u610f\uff0c\u6211\u6b63\u5728\u4f7f\u7528Flannel\u8fdb\u884c\u9a8c\u8bc1\u3002\u7531\u4e8e\u76ee\u524d\u5c1a\u672a\u5b9e\u73b0NetworkPolicy\uff0c\u6240\u4ee5\u5373\u4f7f\u5728\u4e0d\u540c\u7684\u547d\u540d\u7a7a\u95f4\u4e4b\u95f4\u4e5f\u53ef\u4ee5\u8fdb\u884c\u8fde\u63a5\u3002<\/p>\n<h1>\u65e0\u5934\u670d\u52a1\u7684\u540d\u79f0\u89e3\u6790<\/h1>\n<p>Headless\u30b5\u30fc\u30d3\u30b9\u3068\u306f\u3001Service\u3092\u5229\u7528\u3057\u305fLoadbalance\u304c\u4e0d\u8981\u306a\u6642\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002Service\u3092\u4f5c\u6210\u3059\u308b\u3068\u304d\u306b\u3001spec.clusterIP \u3092 none \u306b\u3059\u308b\u3068\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<br \/>\nHeadless\u30b5\u30fc\u30d3\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001Kuberenetes\u306eLoadbalance\u30b5\u30fc\u30d3\u30b9\u3092\u4f7f\u7528\u305b\u305a\u306b\u3001\u72ec\u81ea\u306b\u5b9f\u88c5\u3057\u305f\u65b9\u6cd5\u3067\u30b5\u30fc\u30d3\u30b9\u30c7\u30a3\u30b9\u30ab\u30d0\u30ea\u30fc\u3092\u884c\u3046\u4e8b\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n<p>\u5728\u65e0\u5934\u670d\u52a1\u4e2d\uff0ckube-proxy\u6ca1\u6709\u4efb\u4f55\u4f5c\u7528\uff0c\u540c\u65f6\u8d1f\u8f7d\u5747\u8861\u548c\u4ee3\u7406\u4e5f\u4e0d\u5de5\u4f5c\u3002<br \/>\n\u8fd9\u65f6DNS\u7684\u5206\u914d\u53d6\u51b3\u4e8eService\u7684\u9009\u62e9\u5668\u5b9a\u4e49\u3002<\/p>\n<h2>\u9009\u62e9\u5668\u5b58\u5728<\/h2>\n<p>\u5c06Service\u7684selector\u8bbe\u7f6e\u4e3a &#8220;\u6709&#8221; \u65f6\uff0c\u5f53\u4ecePod\u89e3\u6790Service\u7684\u540d\u79f0\u65f6\uff0c\u5c06\u91c7\u7528\u89e3\u6790\u5c5e\u4e8e\u8be5Service\u7684\u6240\u6709Pod\u7684IP\u5730\u5740\u7684\u65b9\u5f0f\u3002<br \/>\n\u901a\u5e38\u7684Service\uff0c\u5982\u524d\u9762\u7684\u6d4b\u8bd5\u4e2d\u9a8c\u8bc1\u7684\u90a3\u6837\uff0c\u4f1a\u89e3\u6790\u4e0eService\u5173\u8054\u7684ClusterIP\u3002<br \/>\nHeadless\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u65b9\u5f0f\uff0c\u901a\u5e38\u4e0d\u4f1a\u4f7f\u7528\u3002<\/p>\n<p>\u8003\u8651\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528\u53ef\u80fd\u6709\u4ee5\u4e0b\u6a21\u5f0f\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">ClusterIP\u30b5\u30fc\u30d3\u30b9\u306e\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b9\u306b\u504f\u308a\u304c\u3042\u308a\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u3067\u4efb\u610f\u306b\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b9\u3057\u305f\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Kubernetes\u306e\u30dd\u30ea\u30b7\u30fc\u306b\u306f\u9055\u53cd\u3059\u308b\u304c\u3001\u8907\u6570\u3042\u308bPod\u306e\u3046\u30611\u500b\u306e\u307f\u4f7f\u7528\u3057\u3066\u30a2\u30af\u30bb\u30b9\u3057\u305f\u3044<\/ul>\n<p>\u5728\u4f7f\u7528selectors\u4e2d\u521b\u5efa\u65e0\u5934\u670d\u52a1\u65f6\uff0cendpoints\u63a7\u5236\u5668\u5c06\u521b\u5efaEndpoint\u5bf9\u8c61\u5e76\u66f4\u6539DNS\u8bb0\u5f55\u3002<\/p>\n<p>\u4e3a\u4e86\u68c0\u67e5\u662f\u5426\u542f\u7528\u4e86Headless\u9009\u62e9\u5668\uff0c\u6211\u4eec\u5c06\u521b\u5efa\u4ee5\u4e0b\u7684\u90e8\u7f72\u548c\u670d\u52a1\u3002<\/p>\n<pre class=\"post-pre\"><code>cat &lt;&lt;'EOF' &gt; \/root\/kube_yaml\/dns\/nginx-deployment.yaml\r\napiVersion: apps\/v1 # for versions before 1.9.0 use apps\/v1beta2\r\nkind: Deployment\r\nmetadata:\r\n  name: nginx\r\nspec:\r\n  selector:\r\n    matchLabels:\r\n      app: nginx\r\n  replicas: 2\r\n  template:\r\n    metadata:\r\n      labels:\r\n        app: nginx\r\n    spec:\r\n      containers:\r\n      - name: nginx\r\n        image: nginx\r\n        resources:\r\n          requests:\r\n            cpu: 100m\r\n            memory: 100Mi\r\n        ports:\r\n        - containerPort: 80\r\nEOF\r\n<\/code><\/pre>\n<p>\u521b\u5efa\u4e00\u4e2aDeployment\u3002<\/p>\n<pre class=\"post-pre\"><code>kubectl apply -f \/root\/kube_yaml\/dns\/nginx-deployment.yaml\r\n<\/code><\/pre>\n<p>\u4e3a\u4e86\u521b\u5efaService\uff0c\u6211\u4eec\u9700\u8981\u5728\u4e0b\u9762\u521b\u5efa\u4e00\u4e2a\u6e05\u5355\u6587\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code>cat &lt;&lt;'EOF' &gt; \/root\/kube_yaml\/dns\/nginx-service.yaml\r\napiVersion: v1\r\nkind: Service\r\nmetadata:\r\n  name: nginx-service\r\n  labels:\r\n    app: nginx\r\nspec:\r\n  ports:\r\n  - protocol: TCP\r\n    name: nginx-service-portname\r\n    port: 15315\r\n    targetPort: 80\r\n  clusterIP: None\r\n  selector:\r\n    app: nginx\r\nEOF\r\n<\/code><\/pre>\n<p>\u6211\u4f1a\u521b\u5efa\u4e00\u4e2a\u670d\u52a1\u3002<\/p>\n<pre class=\"post-pre\"><code>kubectl apply -f \/root\/kube_yaml\/dns\/nginx-service.yaml\r\n<\/code><\/pre>\n<p>\u6211\u4f1a\u67e5\u770b\u5217\u8868\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 dns(bar kubernetes-admin)]# kubectl get svc -o wide\r\nNAME            TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)     AGE       SELECTOR\r\nnginx-service   ClusterIP   None         &lt;none&gt;        15315\/TCP   7s        app=nginx\r\n<\/code><\/pre>\n<p>\u6211\u4f1a\u4ed4\u7ec6\u6838\u5b9e\u3002 (W\u01d2 hu\u00ec .)<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 dns(bar kubernetes-admin)]# kubectl describe svc nginx-service \r\nName:              nginx-service\r\nNamespace:         bar\r\nLabels:            app=nginx\r\nAnnotations:       kubectl.kubernetes.io\/last-applied-configuration={\"apiVersion\":\"v1\",\"kind\":\"Service\",\"metadata\":{\"annotations\":{},\"labels\":{\"app\":\"nginx\"},\"name\":\"nginx-service\",\"namespace\":\"bar\"},\"spec\":{\"clusterIP\"...\r\nSelector:          app=nginx\r\nType:              ClusterIP\r\nIP:                None\r\nPort:              nginx-service-portname  15315\/TCP\r\nTargetPort:        80\/TCP\r\nEndpoints:         10.244.1.27:80,10.244.2.26:80\r\nSession Affinity:  None\r\nEvents:            &lt;none&gt;\r\n<\/code><\/pre>\n<p>\u6211\u5c06\u67e5\u770b\u4ee5\u4e0b\u7aef\u70b9\u7684\u5217\u8868\u3002\u5b83\u4e0e\u670d\u52a1\u8fdb\u884c\u534f\u4f5c\uff0c\u81ea\u52a8\u521b\u5efa\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 dns(bar kubernetes-admin)]# kubectl get endpoints \r\nNAME            ENDPOINTS                       AGE\r\nnginx-service   10.244.1.27:80,10.244.2.26:80   1m\r\n<\/code><\/pre>\n<p>\u4f7f\u7528\u5728\u7aef\u70b9\u4e0a\u7684IP\u5730\u5740\u662f\u81ea\u52a8\u5206\u914d\u7ed9Pod\u7684IP\u5730\u5740<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 dns(bar kubernetes-admin)]# kubectl get pods -o wide\r\nNAME                     READY     STATUS    RESTARTS   AGE       IP            NODE\r\nnginx-5c9845d857-5tvlt   1\/1       Running   0          9m        10.244.1.27   sugi-kubernetes110-node01.localdomain\r\nnginx-5c9845d857-vlgl2   1\/1       Running   0          9m        10.244.2.26   sugi-kubernetes110-node02.localdomain\r\n<\/code><\/pre>\n<p>nslookup\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306b\u3001CentOS\u306ePod\u3092\u4f5c\u6210\u3057\u3001bash\u306b\u30ed\u30b0\u30a4\u30f3\u3057\u307e\u3059<\/p>\n<pre class=\"post-pre\"><code>kubectl create -f \/root\/kube_yaml\/dns\/centos_pod.yaml\r\nkubectl exec centos-749b5dff6-bpcrb -it bash\r\n<\/code><\/pre>\n<p>nslookup\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u307e\u3059<\/p>\n<pre class=\"post-pre\"><code>yum install -y bind-utils\r\n<\/code><\/pre>\n<p>nslookup\u3067HeadlessService\u306e\u540d\u524d\u89e3\u6c7a\u3092\u5b9f\u65bd\u3059\u308b\u3068\u5168\u3066\u306ePod\u306eIP\u30a2\u30c9\u30ec\u30b9\u304creturn\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@centos-749b5dff6-bpcrb \/]# nslookup nginx-service\r\nServer:         10.96.0.10\r\nAddress:        10.96.0.10#53\r\n\r\nName:   nginx-service.bar.svc.cluster.local\r\nAddress: 10.244.1.27\r\nName:   nginx-service.bar.svc.cluster.local\r\nAddress: 10.244.2.26\r\n<\/code><\/pre>\n<h2>\u6ca1\u6709\u9009\u62e9\u5668\uff08ServiceType: ExternalName\u7684\u522b\u540d\uff09<\/h2>\n<p>\u5728\u6ca1\u6709\u9009\u62e9\u5668\u7684\u60c5\u51b5\u4e0b\u521b\u5efa\u65e0\u5934\u670d\u52a1\u65f6\uff0c\u65e0\u6cd5\u521b\u5efa\u7aef\u70b9\u5bf9\u8c61\u3002\u4f5c\u4e3aDNS\u7684CNAME\uff0c\u670d\u52a1\u7684\u5916\u90e8\u540d\u79f0\u5c06\u88ab\u6ce8\u518c\u3002<\/p>\n<p>\u4e3a\u4e86\u786e\u8ba4\u64cd\u4f5c\uff0c\u5c06\u521b\u5efa\u4ee5\u4e0b\u6e05\u5355\u6587\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code>cat &lt;&lt;'EOF' &gt; \/root\/kube_yaml\/dns\/nginx-service.yaml\r\napiVersion: v1\r\nkind: Service\r\nmetadata:\r\n  name: nginx-headless-noselector\r\n  labels:\r\n    app: nginx\r\nspec:\r\n  type: ExternalName\r\n  externalName: 10.132.253.39\r\nEOF\r\n<\/code><\/pre>\n<p>\u670d\u52a1\u7684\u521b\u5efa<\/p>\n<pre class=\"post-pre\"><code>kubectl apply -f \/root\/kube_yaml\/dns\/nginx-service.yaml\r\n<\/code><\/pre>\n<p>Service\u306e\u4e00\u89a7\u78ba\u8a8d<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 ~(bar kubernetes-admin)]# kubectl get svc\r\nNAME                        TYPE           CLUSTER-IP   EXTERNAL-IP     PORT(S)     AGE\r\nnginx-headless-noselector   ExternalName   &lt;none&gt;       10.132.253.39   &lt;none&gt;      5s\r\nnginx-service               ClusterIP      None         &lt;none&gt;          15315\/TCP   53m\r\n<\/code><\/pre>\n<p>\u67e5\u770b\u7ec6\u8282<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 ~(bar kubernetes-admin)]# kubectl describe svc nginx-headless-noselector \r\nName:              nginx-headless-noselector\r\nNamespace:         bar\r\nLabels:            app=nginx\r\nAnnotations:       kubectl.kubernetes.io\/last-applied-configuration={\"apiVersion\":\"v1\",\"kind\":\"Service\",\"metadata\":{\"annotations\":{},\"labels\":{\"app\":\"nginx\"},\"name\":\"nginx-headless-noselector\",\"namespace\":\"bar\"},\"spec\":...\r\nSelector:          &lt;none&gt;\r\nType:              ExternalName\r\nIP:                \r\nExternal Name:     10.132.253.39\r\nSession Affinity:  None\r\nEvents:            &lt;none&gt;\r\n<\/code><\/pre>\n<p>\u5f53\u5728Pod\u4e2d\u6267\u884cService\u7684\u540d\u79f0\u89e3\u6790\u65f6\uff0c\u53ef\u4ee5\u89e3\u6790\u4e0a\u8ff0\u7684ExternalIP\u3002<br \/>\n\u5982\u679c\u6307\u5b9aIP\u5730\u5740\uff0c\u5219\u4f1a\u8fd4\u56deA\u8bb0\u5f55\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@centos-749b5dff6-bpcrb \/]# nslookup nginx-headless-noselector \r\nServer:         10.96.0.10\r\nAddress:        10.96.0.10#53\r\n\r\nName:   nginx-headless-noselector.bar.svc.cluster.local\r\nAddress: 10.132.253.39\r\n<\/code><\/pre>\n<p>\u7528\u4e3b\u673a\u540d\u4ee3\u66ffIP\u5730\u5740\u6765\u9009\u62e9\u53e6\u4e00\u79cd\u6a21\u5f0f\u3002<\/p>\n<pre class=\"post-pre\"><code>cat &lt;&lt;'EOF' &gt; \/root\/kube_yaml\/dns\/nginx-service-name.yaml\r\napiVersion: v1\r\nkind: Service\r\nmetadata:\r\n  name: nginx-headless-noselector\r\n  labels:\r\n    app: nginx\r\nspec:\r\n  type: ExternalName\r\n  externalName: www.google.co.jp\r\nEOF\r\n<\/code><\/pre>\n<p>\u7533\u8bf7<\/p>\n<pre class=\"post-pre\"><code>kubectl apply -f \/root\/kube_yaml\/dns\/nginx-service-name.yaml\r\n<\/code><\/pre>\n<p>\u5f53\u8fdb\u884cnslookup\u65f6\uff0c\u4f1a\u8fd4\u56de&#8221;www.google.co.jp&#8221;\u4f5c\u4e3aCNAME\u8bb0\u5f55\uff0c\u5e76\u5bf9\u5176\u8fdb\u884c\u540d\u79f0\u89e3\u6790\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@centos-749b5dff6-bpcrb \/]# nslookup nginx-headless-noselector \r\nServer:         10.96.0.10\r\nAddress:        10.96.0.10#53\r\n\r\nNon-authoritative answer:\r\nnginx-headless-noselector.bar.svc.cluster.local canonical name = www.google.co.jp.\r\nName:   www.google.co.jp\r\nAddress: 172.217.27.67\r\n\r\n<\/code><\/pre>\n<p>\u6316\u6398\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>[root@centos-749b5dff6-bpcrb \/]# dig nginx-headless-noselector.bar.svc.cluster.local\r\n\r\n; &lt;&lt;&gt;&gt; DiG 9.9.4-RedHat-9.9.4-51.el7_4.2 &lt;&lt;&gt;&gt; nginx-headless-noselector.bar.svc.cluster.local\r\n;; global options: +cmd\r\n;; Got answer:\r\n;; -&gt;&gt;HEADER&lt;&lt;- opcode: QUERY, status: NOERROR, id: 53443\r\n;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1\r\n\r\n;; OPT PSEUDOSECTION:\r\n; EDNS: version: 0, flags:; udp: 4096\r\n;; QUESTION SECTION:\r\n;nginx-headless-noselector.bar.svc.cluster.local. IN A\r\n\r\n;; ANSWER SECTION:\r\nnginx-headless-noselector.bar.svc.cluster.local. 20 IN CNAME www.google.co.jp.\r\nwww.google.co.jp.       20      IN      A       172.217.27.67\r\n\r\n;; Query time: 1 msec\r\n;; SERVER: 10.96.0.10#53(10.96.0.10)\r\n;; WHEN: Wed May 02 15:01:32 UTC 2018\r\n;; MSG SIZE  rcvd: 122\r\n\r\n<\/code><\/pre>\n<h1>Pod\u7684\u540d\u79f0\u89e3\u6790<\/h1>\n<h2>\u81ea\u52a8\u6ce8\u518cA\u8bb0\u5f55<\/h2>\n<p>Pod\u7684DNS A\u8bb0\u5f55\u662f\u81ea\u52a8\u914d\u7f6e\u7684\uff0c\u5177\u4f53\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre class=\"post-pre\"><code>pod-ip-address.my-namespace.pod.cluster.local\r\n<\/code><\/pre>\n<p>\u5982\u679c\u5728bar\u547d\u540d\u7a7a\u95f4\u4e2d\u5b58\u5728\u4ee5\u4e0b3\u79cd\u7c7b\u578b\u7684Pod\uff0c<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 ~(bar kubernetes-admin)]# kubectl get pods -o wide\r\nNAME                     READY     STATUS    RESTARTS   AGE       IP            NODE\r\ncentos-749b5dff6-bpcrb   1\/1       Running   0          57m       10.244.1.28   sugi-kubernetes110-node01.localdomain\r\nnginx-5c9845d857-5tvlt   1\/1       Running   0          1h        10.244.1.27   sugi-kubernetes110-node01.localdomain\r\nnginx-5c9845d857-vlgl2   1\/1       Running   0          1h        10.244.2.26   sugi-kubernetes110-node02.localdomain\r\n<\/code><\/pre>\n<p>\u4f60\u53ef\u4ee5\u901a\u8fc7\u300c10-244-1-28.bar.pod.cluster.local.\u300d\u6765\u8fdb\u884c\u540d\u79f0\u89e3\u6790\uff08\u8bf7\u6ce8\u610f\uff0c\u5b83\u4e0d\u5305\u542b\u5728\u641c\u7d22\u5217\u8868\u4e2d\u7684\u540e\u7f00\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@centos-749b5dff6-bpcrb \/]# nslookup 10-244-1-28.bar.pod.cluster.local.\r\nServer:         10.96.0.10\r\nAddress:        10.96.0.10#53\r\n\r\nName:   10-244-1-28.bar.pod.cluster.local\r\nAddress: 10.244.1.28\r\n<\/code><\/pre>\n<h2>Pod\u7684DNS\u7b56\u7565<\/h2>\n<p>Pod\u7684DNS\u7b56\u7565\u53ef\u4ee5\u5728Pod\u7ea7\u522b\u8fdb\u884c\u8bbe\u7f6e\u3002\u5f53\u524d\uff0c\u5728Kubernetes\u4e2d\u53ef\u9009\u62e9\u4ee5\u4e0b\u7b56\u7565\u3002<br \/>\n\u60a8\u53ef\u4ee5\u5728\u6e05\u5355\u6587\u4ef6\u4e2d\u4f7f\u7528dnsPolicy\u5b57\u6bb5\u8fdb\u884c\u6307\u5b9a\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">default (\u203b) : kube-dns\u3067\u89e3\u6c7a\u51fa\u6765\u306a\u3044\u540d\u524d\u89e3\u6c7a\u306e\u5834\u5408\u3001Pod\u304c\u7a3c\u50cd\u3057\u3066\u3044\u308bNode\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u3001DNS\u30b5\u30fc\u30d0(upstream nameserver\u3068\u8868\u73fe\u3055\u308c\u3066\u3044\u308b)\u3092\u4f7f\u7528\u3057\u3066\u540d\u524d\u89e3\u6c7a\u3092\u884c\u3044\u307e\u3059\u3002\u6b21\u306e\u300cClusterFirst\u300d\u3067\u306f\u3001stub-domain\u3084upstreamDNS\u30b5\u30fc\u30d0\u3092\u500b\u5225\u306b\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u304c\u3001default\u30dd\u30ea\u30b7\u30fc\u3067\u306f\u8a2d\u5b9a\u3092\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u305b\u3093\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">ClusterFirst : kube-dns\u3067\u89e3\u6c7a\u51fa\u6765\u306a\u3044\u540d\u524d\u89e3\u6c7a\u306e\u5834\u5408\u3001Pod\u304c\u7a3c\u50cd\u3057\u3066\u3044\u308bNode\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u3001DNS\u30b5\u30fc\u30d0(upstream nameserver\u3068\u8868\u73fe\u3055\u308c\u3066\u3044\u308b)\u3092\u4f7f\u7528\u3057\u3066\u540d\u524d\u89e3\u6c7a\u3092\u884c\u3044\u307e\u3059\u3002Cluster\u7ba1\u7406\u8005\u306f\u3001stub-domain\u3084upstreamDNS\u30b5\u30fc\u30d0\u3092\u500b\u5225\u306b\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002https:\/\/kubernetes.io\/docs\/tasks\/administer-cluster\/dns-custom-nameservers\/#impacts-on-pods<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">ClusterFirstWithHostNet : hostNetwork\u3067\u7a3c\u50cd\u3057\u3066\u3044\u308bPod\u306f\u3001\u300cClusterFirstWithHostNet\u300d\u3092DNS\u30dd\u30ea\u30b7\u30fc\u3068\u3057\u3066\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">None : Kubernetes version 1.9 \u3067\u8ffd\u52a0\u3055\u308c\u305f\u6a5f\u80fd\u3067\u3059\u3002Kubernetes\u306eDNS\u81ea\u52d5\u8a2d\u5b9a\u3092\u7121\u8996\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059 dnsConfig \u306b\u3088\u308b\u8a2d\u5b9a\u306e\u307f\u884c\u3046\u4e8b\u304c\u51fa\u6765\u307e\u3059\u3002https:\/\/kubernetes.io\/docs\/concepts\/services-networking\/dns-pod-service\/#pods-dns-config<\/ul>\n<p>\u203b \u9ed8\u8ba4\u503c\u5e76\u975e\u9ed8\u8ba4DNS\u7b56\u7565\u3002\u82e5\u672a\u6307\u5b9aDNS\u7b56\u7565\uff0c\u5219\u9009\u62e9\u201cClusterFirst\u201d\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u6307\u5b9a DNS \u7b56\u7565\u4e3a &#8220;ClusterFirstWithHostNet&#8221; \u7684\u4e0b\u4e00\u4e2a\u6e05\u5355\u6587\u4ef6\u3002\u540c\u65f6\u5c06 spec.hostNetwork \u8bbe\u7f6e\u4e3a true\u3002<\/p>\n<pre class=\"post-pre\"><code>cat &lt;&lt;'EOF' &gt; \/root\/kube_yaml\/dns\/busybox-hostnw.yaml\r\napiVersion: v1\r\nkind: Pod\r\nmetadata:\r\n  name: busybox\r\nspec:\r\n  containers:\r\n  - image: busybox\r\n    command:\r\n      - sleep\r\n      - \"3600\"\r\n    imagePullPolicy: IfNotPresent\r\n    name: busybox\r\n  restartPolicy: Always\r\n  hostNetwork: true\r\n  dnsPolicy: ClusterFirstWithHostNet\r\nEOF\r\n<\/code><\/pre>\n<p>\u521b\u4f5c<\/p>\n<pre class=\"post-pre\"><code>kubectl apply -f \/root\/kube_yaml\/dns\/busybox-hostnw.yaml\r\n<\/code><\/pre>\n<p>\u6211\u4f1a\u786e\u8ba4\u4e00\u4e0b\u3002busybox\u7684IP\u5df2\u7ecf\u53d8\u6210\u4e86node\u7684IP\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@sugi-kubernetes110-master01 dns(bar kubernetes-admin)]# kubectl get pods -o wide\r\nNAME                     READY     STATUS    RESTARTS   AGE       IP                NODE\r\nbusybox                  1\/1       Running   0          10s       192.168.120.223   sugi-kubernetes110-node01.localdomain\r\ncentos-749b5dff6-bpcrb   1\/1       Running   2          2h        10.244.1.28       sugi-kubernetes110-node01.localdomain\r\nnginx-5c9845d857-5tvlt   1\/1       Running   0          2h        10.244.1.27       sugi-kubernetes110-node01.localdomain\r\nnginx-5c9845d857-vlgl2   1\/1       Running   0          2h        10.244.2.26       sugi-kubernetes110-node02.localdomain\r\n<\/code><\/pre>\n<p>\u542f\u52a8sh\u5e76\u767b\u5f55<\/p>\n<pre class=\"post-pre\"><code>kubectl exec busybox -it sh\r\n<\/code><\/pre>\n<p>\u5728\u5bb9\u5668\u4e2d\uff0c\u53ef\u4ee5\u770b\u5230\u4e3b\u673a\u7aef\u7684\u7f51\u7edc\u3002<\/p>\n<pre class=\"post-pre\"><code>\/ # ip a\r\n1: lo: &lt;LOOPBACK,UP,LOWER_UP&gt; mtu 65536 qdisc noqueue qlen 1\r\n    link\/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00\r\n    inet 127.0.0.1\/8 scope host lo\r\n       valid_lft forever preferred_lft forever\r\n    inet6 ::1\/128 scope host \r\n       valid_lft forever preferred_lft forever\r\n2: ens192: &lt;BROADCAST,MULTICAST,UP,LOWER_UP&gt; mtu 1500 qdisc mq qlen 1000\r\n    link\/ether 00:50:56:98:70:ab brd ff:ff:ff:ff:ff:ff\r\n    inet 192.168.120.223\/24 brd 192.168.120.255 scope global ens192\r\n       valid_lft forever preferred_lft forever\r\n    inet6 fe80::f59f:2d01:78d0:bcb9\/64 scope link \r\n       valid_lft forever preferred_lft forever\r\n    inet6 fe80::98a0:413d:6b71:8fbd\/64 scope link tentative flags 08 \r\n       valid_lft forever preferred_lft forever\r\n3: docker0: &lt;NO-CARRIER,BROADCAST,MULTICAST,UP&gt; mtu 1500 qdisc noqueue \r\n    link\/ether 02:42:3e:8b:64:af brd ff:ff:ff:ff:ff:ff\r\n    inet 172.17.0.1\/16 scope global docker0\r\n       valid_lft forever preferred_lft forever\r\n4: flannel.1: &lt;BROADCAST,MULTICAST,UP,LOWER_UP&gt; mtu 1450 qdisc noqueue \r\n    link\/ether 62:c4:05:0d:c1:d3 brd ff:ff:ff:ff:ff:ff\r\n    inet 10.244.1.0\/32 scope global flannel.1\r\n       valid_lft forever preferred_lft forever\r\n    inet6 fe80::60c4:5ff:fe0d:c1d3\/64 scope link \r\n       valid_lft forever preferred_lft forever\r\n5: cni0: &lt;BROADCAST,MULTICAST,UP,LOWER_UP&gt; mtu 1450 qdisc noqueue qlen 1000\r\n    link\/ether 0a:58:0a:f4:01:01 brd ff:ff:ff:ff:ff:ff\r\n    inet 10.244.1.1\/24 scope global cni0\r\n       valid_lft forever preferred_lft forever\r\n    inet6 fe80::9ca5:24ff:fe55:9672\/64 scope link \r\n       valid_lft forever preferred_lft forever\r\n31: vetha1c264dc@docker0: &lt;BROADCAST,MULTICAST,UP,LOWER_UP&gt; mtu 1450 qdisc noqueue master cni0 \r\n    link\/ether 1e:a2:df:06:57:ba brd ff:ff:ff:ff:ff:ff\r\n    inet6 fe80::1ca2:dfff:fe06:57ba\/64 scope link \r\n       valid_lft forever preferred_lft forever\r\n32: veth224aaf36@docker0: &lt;BROADCAST,MULTICAST,UP,LOWER_UP&gt; mtu 1450 qdisc noqueue master cni0 \r\n    link\/ether a2:17:d4:7c:55:ea brd ff:ff:ff:ff:ff:ff\r\n    inet6 fe80::a017:d4ff:fe7c:55ea\/64 scope link \r\n       valid_lft forever preferred_lft forever\r\n<\/code><\/pre>\n<p>\u67e5\u770bresolv.conf\u6587\u4ef6<\/p>\n<pre class=\"post-pre\"><code>\/ # cat \/etc\/resolv.conf \r\nnameserver 10.96.0.10\r\nsearch bar.svc.cluster.local svc.cluster.local cluster.local localdomain\r\noptions ndots:5\r\n<\/code><\/pre>\n<p>nslookup\u770b\u8d77\u6765\u4e0e\u666e\u901a\u7684Pod\u4e00\u6837\u3002<\/p>\n<pre class=\"post-pre\"><code>\/ # nslookup foo1\r\nServer:    10.96.0.10\r\nAddress 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local\r\n\r\nName:      foo1\r\nAddress 1: 10.107.131.250 foo1.bar.svc.cluster.local\r\n<\/code><\/pre>\n<h2>Pod\u7684DNS\u914d\u7f6e<\/h2>\n<p>\u4ece Kubernetes v1.9 \u5f00\u59cb\uff0c\u60a8\u53ef\u4ee5\u63a7\u5236 Pod \u7684 DNS \u8bbe\u7f6e\u3002\u5c3d\u7ba1 Kubernetes 1.10 \u9ed8\u8ba4\u542f\u7528\u4e86\u8be5\u529f\u80fd\uff0c\u4f46\u5728 v1.9 \u4e2d\uff0c\u60a8\u9700\u8981\u901a\u8fc7\u8bbe\u7f6e kubelete \u7684\u53c2\u6570 &#8211;feature-gates=CustomPodDNS=true,&#8230;\u6765\u542f\u52a8\u8be5\u8fdb\u7a0b\u3002<\/p>\n<p>\u521b\u5efa\u90e8\u7f72\u6e05\u5355\u6587\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code>cat &lt;&lt;'EOF' &gt; \/root\/kube_yaml\/dns\/dnsconfig_centos_pod.yaml\r\napiVersion: apps\/v1 # for versions before 1.9.0 use apps\/v1beta2\r\nkind: Deployment\r\nmetadata:\r\n  name: dnsconfig-centos\r\nspec:\r\n  selector:\r\n    matchLabels:\r\n      app: dnsconfig-centos\r\n  replicas: 1\r\n  template:\r\n    metadata:\r\n      labels:\r\n        app: dnsconfig-centos\r\n    spec:\r\n      containers:\r\n      - name: dnsconfig-centos\r\n        image: centos\r\n        command: [ \"sleep\", \"3600\" ]\r\n      dnsPolicy: \"None\"\r\n      dnsConfig:\r\n        nameservers:\r\n          - 1.2.3.4\r\n        searches:\r\n          - ns1.svc.cluster.local\r\n          - my.dns.search.suffix\r\n        options:\r\n          - name: ndots\r\n            value: \"2\"\r\n          - name: edns0\r\nEOF\r\n<\/code><\/pre>\n<p>\u521b\u5efa\u90e8\u7f72 (Chuangjian bushu)<\/p>\n<pre class=\"post-pre\"><code>kubectl apply -f \/root\/kube_yaml\/dns\/dnsconfig_centos_pod.yaml\r\n<\/code><\/pre>\n<p>\u542f\u52a8bash<\/p>\n<pre class=\"post-pre\"><code>kubectl exec dnsconfig-centos-d9c4f576f-k9kj8 -it bash\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0b\u662fPod\u7684resolv.config\u8bbe\u7f6e<br \/>\n\u5f53\u7136\uff0c\u4e0b\u9762\u7684\u8bbe\u7f6e\u65e0\u6cd5\u89e3\u51b3\u96c6\u7fa4\u5185\u90e8\u7684\u540d\u79f0\u89e3\u6790\u95ee\u9898\uff0c\u4e5f\u65e0\u6cd5\u89e3\u51b3\u5916\u90e8\u7684\u540d\u79f0\u89e3\u6790\u95ee\u9898\u3002<\/p>\n<pre class=\"post-pre\"><code>[root@dnsconfig-centos-d9c4f576f-k9kj8 \/]# cat \/etc\/resolv.conf \r\nnameserver 1.2.3.4\r\nsearch ns1.svc.cluster.local my.dns.search.suffix\r\noptions ndots:2 edns0\r\n<\/code><\/pre>\n<h1>\u8bf7\u63d0\u4f9b\u4e00\u4e2a\u53c2\u8003\u7f51\u5740\u3002<\/h1>\n<p>\u5173\u4e8eKubernetes &#8220;\u670d\u52a1&#8221;\u6982\u8ff0\u7684\u81ea\u5b66\u7b14\u8bb0<br \/>\nhttps:\/\/qiita.com\/MahoTakara\/items\/d18d8f9b36416353066c<\/p>\n<p>Kubernetes Blog<br \/>\nhttps:\/\/kubernetes.io\/blog\/2017\/04\/configuring-private-dns-zones-upstream-nameservers-kubernetes<\/p>\n<p>\u5b58\u6839\u57df\uff0c\u4e0a\u6e38DNS\u3002\u8bf7\u53c2\u8003 https:\/\/kubernetes.io\/docs\/tasks\/administer-cluster\/dns-custom-nameservers\/#impacts-on-pods\u3002<\/p>\n<p>DNS\u914d\u7f6e<br \/>\nhttps:\/\/kubernetes.io\/docs\/concepts\/services-networking\/dns-pod-service\/#pods-dns-config<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 Kubernetes\u306e\u516c\u5f0f\u30da\u30fc\u30b8\u306b\u3001\u591a\u304f\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u304c\u63b2\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002 Kubernetes\u306e\u52c9\u5f37 [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-35917","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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