{"id":35527,"date":"2023-06-08T16:41:37","date_gmt":"2024-01-30T23:46:38","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%8e%a5%e8%a7%a6kubernetes%ef%bc%9a%e6%8e%a2%e7%b4%a2kubernetes%e5%86%85%e9%83%a8%e7%9a%84%e7%bd%91%e7%bb%9c%e5%92%8cdns%e3%80%82\/"},"modified":"2024-04-30T07:54:01","modified_gmt":"2024-04-29T23:54:01","slug":"%e6%8e%a5%e8%a7%a6kubernetes%ef%bc%9a%e6%8e%a2%e7%b4%a2kubernetes%e5%86%85%e9%83%a8%e7%9a%84%e7%bd%91%e7%bb%9c%e5%92%8cdns%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%8e%a5%e8%a7%a6kubernetes%ef%bc%9a%e6%8e%a2%e7%b4%a2kubernetes%e5%86%85%e9%83%a8%e7%9a%84%e7%bd%91%e7%bb%9c%e5%92%8cdns%e3%80%82\/","title":{"rendered":"\u63a5\u89e6Kubernetes\uff1a\u63a2\u7d22Kubernetes\u5185\u90e8\u7684\u7f51\u7edc\u548cDNS"},"content":{"rendered":"

Kubernetes\u306b\u89e6\u308c\u308b \u306e\u7d9a\u304d\u3002Kubernetes\u306eNetwork\u95a2\u9023\u306e\u8a71\u984c\u306b\u3064\u3044\u3066\u3002<\/p>\n

Network\u306b\u3064\u3044\u3066<\/h1>\n

Pod\u9593\u306e\u901a\u4fe1<\/h2>\n

Kubernetes\u30af\u30e9\u30b9\u30bf\u3092kubeadm\u306a\u3069\u3092\u4f7f\u3063\u3066\u69cb\u7bc9\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u306b\u306a\u308b\u3002<\/p>\n

kubectl apply -n kube-system -f \\\r\n    \"https:\/\/cloud.weave.works\/k8s\/net?k8s-version=$(kubectl version | base64 |tr -d '\\n')\"\r\n<\/code><\/pre>\n
\u3053\u306e\u4f5c\u696d\u3067\u3001Kubernetes\u4e0a\u3067\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304c\u4f5c\u3089\u308c\u308b\u3002Weave Net\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f10.32.0.0\/12\u3068\u3044\u3046\u30bb\u30b0\u30e1\u30f3\u30c8\u3067\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u4f5c\u308b\u3002\u3053\u306e\u30bb\u30b0\u30e1\u30f3\u30c8\u306e\u6307\u5b9a\u306f\u5909\u66f4\u53ef\u80fd\u3067\u3042\u308b\u3002\u30db\u30b9\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3068\u88ab\u3063\u3066\u306f\u3044\u3051\u306a\u3044\u3068\u3044\u3046\u5236\u7d04\u304c\u3042\u308b\u306e\u3067\u3001\u30db\u30b9\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304c\u4f8b\u3048\u307010.0.0.0\/8\u3067\u3042\u308b\u5834\u5408\u306f\u3001\u660e\u793a\u7684\u306b\u5225\u306e\u30bb\u30b0\u30e1\u30f3\u30c8\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n
\u8fd9\u6b21\u6211\u4eec\u9009\u62e9\u4e86\u5e94\u7528Weave Net\uff0c\u4f46\u8fd8\u6709\u5176\u4ed6\u9009\u62e9\uff0c\u5982Flannel\u548cCalico\u3002\u8bf7\u53c2\u8003kubeadm\u7684\u5b98\u65b9\u7f51\u7ad9\u3002<\/p>\n
Pod\u30922\u3064\u30c7\u30d7\u30ed\u30a4\u3057\u3066\u307f\u308b\u3002\u4ee5\u4e0b\u306fcentos7\u306eContainer\u30a4\u30e1\u30fc\u30b8\u3092\u52d5\u304b\u3057\u3066sleep 3600\u3092\u5b9f\u884c\u3057\u305fPod\u304c\u30c7\u30d7\u30ed\u30a4\u3055\u308c\u3066\u3044\u308b\u69d8\u5b50\u3002<\/p>\n
[node1 ~]$<\/span> kubectl get po -o<\/span> wide\r\nNAME      READY     STATUS    RESTARTS   AGE       IP          NODE      NOMINATED NODE\r\n<\/span>cent-1    1\/1       Running   0          17s       10.44.0.1   node3     <none><\/span>\r\ncent-2    1\/1       Running   0          13s       10.36.0.1   node2     <none><\/span>\r\n<\/code><\/pre>\n
\u5f53\u67e5\u770bPod\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230IP\u5730\u5740\u5206\u914d\u572810.32.0.0\/12\u7684\u8303\u56f4\u5185\u3002\u8fd9\u6837\uff0c\u5728Kubernetes\u4e2d\uff0c\u6bcf\u4e2aPod\u90fd\u88ab\u5206\u914d\u4e00\u4e2aIP\u5730\u5740\u3002<\/p>\n
\u8272\u3005\u306a\u3068\u3053\u308d\u304b\u3089ping\u3057\u3066\u307f\u308b\u3002\u4eca\u56de\u306f\u3001node1\u304cMaster\u3067node2, node3, node4\u304cNodes\u3067\u3042\u308b\u3002<\/p>\n
\u4eceNodenode2\u5411Podcent-1\u53d1\u9001ping\u8bf7\u6c42\u3002<\/p>\n
[node2 ~]$<\/span> ping 10.44.0.1\r\nPING 10.44.0.1 (10.44.0.1) 56(84) bytes of data.\r\n64 bytes from 10.44.0.1: icmp_seq=1 ttl=64 time=1.45 ms\r\n64 bytes from 10.44.0.1: icmp_seq=2 ttl=64 time=0.769 ms\r\n^C\r\n--- 10.44.0.1 ping statistics ---\r\n2 packets transmitted, 2 received, 0% packet loss, time 1000ms\r\nrtt min\/avg\/max\/mdev = 0.769\/1.110\/1.452\/0.343 ms\r\n<\/span><\/code><\/pre>\n
Podcent-1\u5411Podcent-2\u53d1\u9001ping\u8bf7\u6c42\u3002<\/p>\n
[node1 ~]$<\/span> kubectl exec<\/span> -it<\/span> cent-1 \/bin\/sh\r\nsh-4.2#<\/span> ping 10.36.0.1\r\nPING 10.36.0.1 (10.36.0.1) 56(84) bytes of data.\r\n64 bytes from 10.36.0.1: icmp_seq=1 ttl=64 time=2.54 ms\r\n64 bytes from 10.36.0.1: icmp_seq=2 ttl=64 time=0.781 ms\r\n^C\r\n--- 10.36.0.1 ping statistics ---\r\n2 packets transmitted, 2 received, 0% packet loss, time 1001ms\r\nrtt min\/avg\/max\/mdev = 0.781\/1.663\/2.545\/0.882 ms\r\n<\/span><\/code><\/pre>\n
\u3053\u306e\u3088\u3046\u306b\u3001Kubernetes\u306e\u4e2d\u3067\u306f\u30af\u30e9\u30b9\u30bf\u56fa\u6709\u306e\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304c\u3042\u308b\u3002\u3053\u306e\u4ed5\u7d44\u307f\u306b\u3088\u3063\u3066\u3001Kubernetes\u30af\u30e9\u30b9\u30bf\u6bce\u306b\u3001\u30db\u30b9\u30c8\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u4f9d\u5b58\u3057\u306a\u3044\u3001\u72ec\u7acb\u3057\u305f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u74b0\u5883\u304c\u5b9f\u73fe\u3067\u304d\u308b\u3002<\/p>\n
Pod\u4e2d\u5bb9\u5668\u4e4b\u95f4\u7684\u901a\u4fe1<\/h2>\n
\u5047\u8bbe\u5728Pod\u5185\u90e8\u6709\u591a\u4e2a\u5bb9\u5668\u7684\u60c5\u51b5\u4e0b\u3002<\/p>\n
\u5148\u306b\u8aac\u660e\u3057\u305f\u3088\u3046\u306b\u3001Kubernetes\u4e0a\u3067\u306fPod\u306b\u4e00\u3064\u306eIP\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u3002<\/p>\n
\u5728Pod\u4e2d\u7684\u5bb9\u5668\u4e4b\u95f4\u5982\u4f55\u8fdb\u884c\u901a\u4fe1\uff1f<\/p>\n
\u8fdb\u884c”yum install tcpdump net-tools”\u64cd\u4f5c\u3002<\/p>\n
apiVersion<\/span>:<\/span> v1<\/span>\r\nkind<\/span>:<\/span> Pod<\/span>\r\nmetadata<\/span>:<\/span>\r\n  name<\/span>:<\/span> cent-cent<\/span>\r\n  labels<\/span>:<\/span>\r\n    app<\/span>:<\/span> myapp<\/span>\r\nspec<\/span>:<\/span>\r\n  containers<\/span>:<\/span>\r\n  -<\/span> name<\/span>:<\/span> cent7-1<\/span>\r\n    image<\/span>:<\/span> centos:7<\/span>\r\n    command<\/span>:<\/span> [<\/span>'<\/span>\/bin\/sh'<\/span>,<\/span> '<\/span>-c'<\/span>,<\/span> '<\/span>\/usr\/bin\/yum<\/span> install<\/span> tcpdump<\/span> net-tools<\/span> -y<\/span> &&<\/span> sleep<\/span> 3600'<\/span>]<\/span>\r\n  -<\/span> name<\/span>:<\/span> cent7-2<\/span>\r\n    image<\/span>:<\/span> centos:7<\/span>\r\n    command<\/span>:<\/span> [<\/span>'<\/span>\/bin\/sh'<\/span>,<\/span> '<\/span>-c'<\/span>,<\/span> '<\/span>\/usr\/bin\/yum<\/span> install<\/span> tcpdump<\/span> net-tools<\/span> -y<\/span> &&<\/span> sleep<\/span> 3600'<\/span>]<\/span>\r\n<\/code><\/pre>\n
\u5f53\u4f7f\u7528ifconfig\u8fdb\u884c\u786e\u8ba4\u65f6\uff0c\u53d1\u73b0\u5177\u6709\u76f8\u540c\u7684IP\u5730\u5740\u3002<\/p>\n
\r\n[node1 ~]$<\/span> kubectl exec<\/span> -it<\/span> cent-cent -c<\/span> cent7-1 \/usr\/sbin\/ifconfig\r\neth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST><\/span>  mtu 65535\r\n        inet 10.47.0.1  netmask 255.240.0.0  broadcast 10.47.255.255\r\n        ether da:aa:b4:3f:6b:87  txqueuelen 0  (Ethernet)\r\n        RX packets 14553  bytes 21243468 (20.2 MiB)\r\n        RX errors 0  dropped 0  overruns 0  frame 0\r\n        TX packets 2958  bytes 210548 (205.6 KiB)\r\n        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0\r\n\r\n<\/span>lo: flags=73<UP,LOOPBACK,RUNNING><\/span>  mtu 65536\r\n        inet 127.0.0.1  netmask 255.0.0.0\r\n        loop  txqueuelen 1  (Local Loopback)\r\n        RX packets 0  bytes 0 (0.0 B)\r\n        RX errors 0  dropped 0  overruns 0  frame 0\r\n        TX packets 0  bytes 0 (0.0 B)\r\n        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0\r\n\r\n<\/span>[node1 ~]$<\/span> kubectl exec<\/span> -it<\/span> cent-cent -c<\/span> cent7-2 \/usr\/sbin\/ifconfig\r\neth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST><\/span>  mtu 65535\r\n        inet 10.47.0.1  netmask 255.240.0.0  broadcast 10.47.255.255\r\n        ether da:aa:b4:3f:6b:87  txqueuelen 0  (Ethernet)\r\n        RX packets 14553  bytes 21243468 (20.2 MiB)\r\n        RX errors 0  dropped 0  overruns 0  frame 0\r\n        TX packets 2958  bytes 210548 (205.6 KiB)\r\n        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0\r\n\r\n<\/span>lo: flags=73<UP,LOOPBACK,RUNNING><\/span>  mtu 65536\r\n        inet 127.0.0.1  netmask 255.0.0.0\r\n        loop  txqueuelen 1  (Local Loopback)\r\n        RX packets 0  bytes 0 (0.0 B)\r\n        RX errors 0  dropped 0  overruns 0  frame 0\r\n        TX packets 0  bytes 0 (0.0 B)\r\n        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0\r\n<\/span><\/code><\/pre>\n
\u305f\u3081\u3057\u306b\u5225\u306e\u30ce\u30fc\u30c9\u304b\u3089ping\u3057\u3066tcpdump\u3057\u3066\u307f\u308b\u3002<\/p>\n
[node1 ~]$ kubectl exec -it cent-cent -c cent7-1 \/bin\/sh\r\nsh-4.2# tcpdump -i eth0 icmp\r\ntcpdump: verbose output suppressed, use -v or -vv for full protocol decode\r\nlistening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes\r\n08:30:37.554918 IP 10.36.0.0 > cent-cent: ICMP echo request, id 38327, seq 39, length 64\r\n08:30:37.554953 IP cent-cent > 10.36.0.0: ICMP echo reply, id 38327, seq 39, length 64\r\n08:30:38.554826 IP 10.36.0.0 > cent-cent: ICMP echo request, id 38327, seq 40, length 64\r\n08:30:38.554899 IP cent-cent > 10.36.0.0: ICMP echo reply, id 38327, seq 40, length 64\r\n\r\n[node1 ~]$ kubectl exec -it cent-cent -c cent7-2 \/bin\/sh\r\nsh-4.2# tcpdump -i eth0 icmp\r\ntcpdump: verbose output suppressed, use -v or -vv for full protocol decode\r\nlistening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes\r\n08:31:03.570873 IP 10.36.0.0 > cent-cent: ICMP echo request, id 38327, seq 65, length 64\r\n08:31:03.570908 IP cent-cent > 10.36.0.0: ICMP echo reply, id 38327, seq 65, length 64\r\n08:31:04.570800 IP 10.36.0.0 > cent-cent: ICMP echo request, id 38327, seq 66, length 64\r\n08:31:04.570836 IP cent-cent > 10.36.0.0: ICMP echo reply, id 38327, seq 66, length 64\r\n<\/code><\/pre>\n
\u3069\u3061\u3089\u3082\u304d\u3066\u308b\u3002<\/p>\n
VM\u306e\u6bd4\u55a9\u3092\u5f15\u304d\u305a\u3063\u3066\u308b\u3068\u308f\u304b\u308a\u306b\u304f\u3044\u73fe\u8c61\u3067\u3042\u308b\u304c\u3001\u3053\u3053\u304b\u3089\u3082\u308f\u304b\u308b\u3088\u3046\u306b\u3001pod\u306fIP\u3092\u5171\u6709\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u3053\u306ePod\u3078ping\u3059\u308b\u3068\u3001\u305d\u308c\u305e\u308c\u306eContainer\u306b\u3042\u305f\u308b\u3002\u3057\u305f\u304c\u3063\u3066\u3053\u306e\u5185\u306eContainer\u4e00\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u306b\u306f\u3001\u30dd\u30fc\u30c8\u3067\u308f\u3051\u308b\u3057\u304b\u306a\u3044\u3002\u5b9f\u969b\u3001Pod\u5185\u306eContainer\u304c\u540c\u3058\u30dd\u30fc\u30c8\u3092\u30d0\u30a4\u30f3\u30c9\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u3002\u4f8b\u3048\u3070Pod\u306b\u4e8c\u3064\u306eNginx\u3092\u7acb\u3066\u3088\u3046\u3068\u3057\u306680\u756a\u30dd\u30fc\u30c8\u3092\u305d\u308c\u305e\u308c\u306eContainer\u304c\u30d0\u30a4\u30f3\u30c9\u3057\u3088\u3046\u3068\u3057\u305f\u5834\u5408\u3001\u30a8\u30e9\u30fc\u3068\u306a\u3063\u3066Pod\u306f\u8d77\u52d5\u3067\u304d\u306a\u3044\u3002<\/p>\n
\u5173\u4e8eDNS<\/h1>\n
\u5404\u79cd\u5404\u6837\u7684\u547d\u540d\u89e3\u51b3\u65b9\u6cd5<\/h2>\n
\u4ee5\u524d\u306b\u3082\u7d39\u4ecb\u3057\u305f\u304c\u3001ClusterIP\u306f\u3053\u308c\u306f\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b7\u30f3\u30b0\u306e\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u3066\u304f\u308c\u308b\u3002\u4eca\u56de\u306f\u3053\u308c\u306e\u540d\u524d\u89e3\u6c7a\u306b\u3064\u3044\u3066\u3002<\/p>\n
Kubernetes\u63d0\u4f9b\u4e86DNS\u670d\u52a1\uff0c\u5e76\u4e3aClusterIP\u5206\u914d\u4e86\u53ef\u89e3\u6790\u7684\u540d\u79f0\u3002<\/p>\n
\u7528\u4e0e\u4e0a\u4e00\u6b21\u76f8\u540c\u7684nginx\u793a\u4f8b\u6765\u601d\u8003\u3002<\/p>\n
[node1 ~]$<\/span> k get pods\r\nNAME                       READY     STATUS    RESTARTS   AGE\r\nmy-nginx-b685dc965-4hc7w   1\/1       Running   0          1m\r\nmy-nginx-b685dc965-7527g   1\/1       Running   0          1m\r\nmy-nginx-b685dc965-mkv9l   1\/1       Running   0          1m\r\n<\/span>[node1 ~]$<\/span> k get svc\r\nNAME           TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE\r\n<\/span>kubernetes     ClusterIP   10.96.0.1      <none><\/span>        443\/TCP    1h\r\nmy-nginx-svc   ClusterIP   10.110.220.5   <none><\/span>        8080\/TCP   1m\r\n<\/code><\/pre>\n
\u6bcf\u4e2aPod\u90fd\u5c0610.96.0.10\u6307\u5b9a\u4e3a\u5176nameserver\u3002<\/p>\n
[node1 ~]$ k exec -it my-nginx-b685dc965-4hc7w \/bin\/sh\r\n# cat \/etc\/resolv.conf\r\nnameserver 10.96.0.10\r\nsearch default.svc.cluster.local svc.cluster.local cluster.local\r\noptions ndots:5\r\n<\/code><\/pre>\n
\u5f53\u6211\u67e5\u8be2\u540d\u4e3amy-nginx-svc.default.svc.cluster.local\u7684\u540d\u79f0\u65f6\uff0c\u4f1a\u8fd4\u56de\u4e00\u4e2aIP\u5730\u5740\u3002\u8fd4\u56de\u7684\u7ed3\u679c\u5c06\u662fClusterIP\u7684IP\u5730\u5740\u3002\u56e0\u6b64\uff0c\u8981\u4ecePod\u4e2d\u4ee5\u968f\u673a\u65b9\u5f0f\u8bbf\u95ee\u67d0\u4e2a\u96c6\u7fa4\uff08\u4f8b\u5982\uff0c\u7528\u4e8e\u53d1\u9001REST API\u7b49\u7528\u9014\uff09\uff0c\u53ea\u9700\u5411\u81ea\u5b9a\u4e49\u7684my-nginx-svc\u540d\u79f0\u53d1\u9001\u8bf7\u6c42\u5373\u53ef\u3002<\/p>\n
[node1 ~]$ dig my-nginx-svc.default.svc.cluster.local @10.96.0.10\r\n\r\n; <<>> DiG 9.9.4-RedHat-9.9.4-73.el7_6 <<>> my-nginx-svc.default.svc.cluster.local @10.96.0.10\r\n;; global options: +cmd\r\n;; Got answer:\r\n;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21647\r\n;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1\r\n\r\n;; OPT PSEUDOSECTION:\r\n; EDNS: version: 0, flags:; udp: 4096\r\n;; QUESTION SECTION:\r\n;my-nginx-svc.default.svc.cluster.local.        IN A\r\n\r\n;; ANSWER SECTION:\r\nmy-nginx-svc.default.svc.cluster.local. 1 IN A  10.110.220.5\r\n\r\n;; Query time: 0 msec\r\n;; SERVER: 10.96.0.10#53(10.96.0.10)\r\n;; WHEN: Sat Mar 09 09:05:23 UTC 2019\r\n;; MSG SIZE  rcvd: 121\r\n<\/code><\/pre>\n
\u4e0a\u8a18\u306e\u4f8b\u3067\u306fA\u30ec\u30b3\u30fc\u30c9\u3092\u8fd4\u3057\u305f\u3002\u3053\u308c\u3092CNAME\u30ec\u30b3\u30fc\u30c9\u3068\u3057\u3066\u6271\u3046\u3053\u3068\u3082\u3067\u304d\u308b\u3002\u305d\u306e\u305f\u3081\u306b\u306fPod\u3067\u30c7\u30d7\u30ed\u30a4\u3057\u3066\u3044\u305f\u3082\u306e\u3092\u3001StatefulSet\u3068\u3057\u3066\u30c7\u30d7\u30ed\u30a4\u3057\u3066\u304a\u304f\u5fc5\u8981\u304c\u3042\u308b\u3002StatefulSet\u3068\u306f\u3001Kubernetes\u4e0a\u3067Stateful\u306a\u5f79\u5272\u3092\u6301\u3064Container\u3092\u6271\u3044\u305f\u3044\u3068\u304d\u306b\u4f7f\u3046\u30ea\u30bd\u30fc\u30b9\u3002\u305f\u3068\u3048\u3070\u30c7\u30a3\u30b9\u30af\u3078\u306e\u30a2\u30af\u30bb\u30b9\u304c\u5fc5\u8981\u306aDB\u3084Kafka\u3092\u30c7\u30d7\u30ed\u30a4\u3057\u305f\u3044\u5834\u5408\u306f\u3053\u308c\u3092\u5229\u7528\u3059\u308b\u3002<\/p>\n
---<\/span>\r\nkind<\/span>:<\/span> Service<\/span>\r\nmetadata<\/span>:<\/span>\r\n  name<\/span>:<\/span> my-nginx-svc<\/span>\r\n  labels<\/span>:<\/span>\r\n    app<\/span>:<\/span> nginx<\/span>\r\nspec<\/span>:<\/span>\r\n  type<\/span>:<\/span> ClusterIP<\/span>\r\n  clusterIP<\/span>:<\/span> None<\/span>\r\n  ports<\/span>:<\/span>\r\n  -<\/span> port<\/span>:<\/span> 8080<\/span>\r\n    targetPort<\/span>:<\/span> 80<\/span>\r\n  selector<\/span>:<\/span>\r\n    app<\/span>:<\/span> nginx<\/span>\r\n---<\/span>\r\napiVersion<\/span>:<\/span> apps\/v1<\/span>\r\nkind<\/span>:<\/span> StatefulSet<\/span>\r\nmetadata<\/span>:<\/span>\r\n  name<\/span>:<\/span> my-nginx<\/span>\r\n  labels<\/span>:<\/span>\r\n    app<\/span>:<\/span> nginx<\/span>\r\nspec<\/span>:<\/span>\r\n  serviceName<\/span>:<\/span> my-nginx-svc<\/span>\r\n  replicas<\/span>:<\/span> 3<\/span>\r\n  selector<\/span>:<\/span>\r\n    matchLabels<\/span>:<\/span>\r\n      app<\/span>:<\/span> nginx<\/span>\r\n  template<\/span>:<\/span>\r\n    metadata<\/span>:<\/span>\r\n      labels<\/span>:<\/span>\r\n        app<\/span>:<\/span> nginx<\/span>\r\n    spec<\/span>:<\/span>\r\n      containers<\/span>:<\/span>\r\n      -<\/span> name<\/span>:<\/span> nginx<\/span>\r\n        image<\/span>:<\/span> nginx:latest<\/span>\r\n<\/code><\/pre>\n
\u3053\u308c\u3092\u9069\u7528\u3059\u308b\u3068Service\u3068StatefulSet\u304c\u30c7\u30d7\u30ed\u30a4\u3055\u308c\u308b\u3002\u307e\u305aService\u306b\u306fClusterIP\u304c\u3064\u3044\u3066\u3044\u306a\u3044\u3002\u4e00\u65b9\u3001\u305d\u308c\u305e\u308c\u306ePod\u306e\u540d\u524d\u304c-0\u3001-1\u3001… \u3068\u3044\u3063\u305f\u3001\u9023\u756a\u306b\u306a\u3063\u3066\u3044\u308b\u3002<\/p>\n
[node1 ~]$<\/span> kubectl get pods\r\nNAME         READY     STATUS    RESTARTS   AGE\r\nmy-nginx-0   1\/1       Running   0          2m\r\nmy-nginx-1   1\/1       Running   0          1m\r\nmy-nginx-2   1\/1       Running   0          1m\r\n<\/span>[node1 ~]$<\/span> kubectl get svc\r\nNAME           TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)    AGE\r\n<\/span>kubernetes     ClusterIP   10.96.0.1    <none><\/span>        443\/TCP    1h\r\nmy-nginx-svc   ClusterIP   None         <none><\/span>        8080\/TCP   2m\r\n<\/code><\/pre>\n
\u3053\u3053\u3067my-nginx-svc\u306e\u540d\u524d\u3092\u5f15\u3044\u3066\u307f\u308b\u3068CNAME\u3067\u304b\u3048\u3063\u3066\u304f\u308b\u3053\u3068\u304c\u308f\u304b\u308b\u3002\u307e\u305f\u3001\u3053\u306e\u72b6\u614b\u306a\u3089\u3070\u305d\u308c\u305e\u308c\u306ePod\u306b\u5bfe\u3057\u3066\u3082\u540d\u524d\u89e3\u6c7a\u3057\u3066\u901a\u4fe1\u3092\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n
[node1 ~]$<\/span> dig my-nginx-svc.default.svc.cluster.local @10.96.0.10\r\n\r\n;<\/span> <<>><\/span> DiG 9.9.4-RedHat-9.9.4-73.el7_6 <<>><\/span> my-nginx-svc.default.svc.cluster.local @10.96.0.10\r\n;<\/span>;<\/span> global options: +cmd\r\n;<\/span>;<\/span> Got answer:\r\n;<\/span>;<\/span> ->>HEADER<<-<\/span> opcode<\/span>: QUERY, status: NOERROR, id: 9330\r\n<\/span>;<\/span>; flags: qr aa rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1\r\n<\/span>\r\n;<\/span>;<\/span> OPT PSEUDOSECTION:\r\n;<\/span> EDNS: version: 0, flags:;<\/span> udp: 4096\r\n;<\/span>;<\/span> QUESTION SECTION:\r\n;<\/span>my-nginx-svc.default.svc.cluster.local.        IN A\r\n\r\n;<\/span>;<\/span> ANSWER SECTION:\r\nmy-nginx-svc.default.svc.cluster.local. 5 IN A  10.36.0.1\r\nmy-nginx-svc.default.svc.cluster.local. 5 IN A  10.44.0.1\r\nmy-nginx-svc.default.svc.cluster.local. 5 IN A  10.47.0.1\r\n\r\n<\/span>;<\/span>;<\/span> Query time<\/span>: 1 msec\r\n;<\/span>;<\/span> SERVER: 10.96.0.10#53(<\/span>10.96.0.10)<\/span>\r\n;<\/span>;<\/span> WHEN: Sat Mar 09 09:19:23 UTC 2019\r\n;<\/span>;<\/span> MSG SIZE  rcvd: 229\r\n\r\n[node1 ~]$<\/span> dig my-nginx-0.my-nginx-svc.default.svc.cluster.local @10.96.0.10\r\n\r\n;<\/span> <<>><\/span> DiG 9.9.4-RedHat-9.9.4-73.el7_6 <<>><\/span> my-nginx-0.my-nginx-svc.default.svc.cluster.local @10.96.0.10\r\n;<\/span>;<\/span> global options: +cmd\r\n;<\/span>;<\/span> Got answer:\r\n;<\/span>;<\/span> ->>HEADER<<-<\/span> opcode<\/span>: QUERY, status: NOERROR, id: 8834\r\n<\/span>;<\/span>; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1\r\n<\/span>\r\n;<\/span>;<\/span> OPT PSEUDOSECTION:\r\n;<\/span> EDNS: version: 0, flags:;<\/span> udp: 4096\r\n;<\/span>;<\/span> QUESTION SECTION:\r\n;<\/span>my-nginx-0.my-nginx-svc.default.svc.cluster.local. IN A\r\n\r\n;<\/span>;<\/span> ANSWER SECTION:\r\nmy-nginx-0.my-nginx-svc.default.svc.cluster.local. 5 IN A 10.44.0.1\r\n\r\n<\/span>;<\/span>;<\/span> Query time<\/span>: 0 msec\r\n;<\/span>;<\/span> SERVER: 10.96.0.10#53(<\/span>10.96.0.10)<\/span>\r\n;<\/span>;<\/span> WHEN: Sat Mar 09 09:21:35 UTC 2019\r\n;<\/span>;<\/span> MSG SIZE  rcvd: 143\r\n<\/code><\/pre>\n
DNS\u306b\u3064\u3044\u3066\u306e\u6700\u5f8c\u306b\u3001Kubernetes\u30af\u30e9\u30b9\u30bf\u5185\u304b\u3089\u5916\u90e8\u3078\u306e\u901a\u4fe1\u306e\u969b\u306e\u540d\u524d\u89e3\u6c7a\u306b\u3064\u3044\u3066\u3002<\/p>\n
\u5982\u679c\u521b\u5efa\u4ee5\u4e0b\u8fd9\u6837\u7684\u670d\u52a1\uff0c\u8fd8\u53ef\u4ee5\u5305\u88c5\u5916\u90e8\u8d44\u6e90\u7684\u540d\u79f0\u3002<\/p>\n
kind<\/span>:<\/span> Service<\/span>\r\napiVersion<\/span>:<\/span> v1<\/span>\r\nmetadata<\/span>:<\/span>\r\n  name<\/span>:<\/span> google-externalname<\/span>\r\n  namespace<\/span>:<\/span> default<\/span>\r\nspec<\/span>:<\/span>\r\n  type<\/span>:<\/span> ExternalName<\/span>\r\n  externalName<\/span>:<\/span> google.com<\/span>\r\n<\/code><\/pre>\n
\u5f53\u67e5\u8be2\u540d\u79f0\u65f6\uff0c\u901a\u8fc7CNAME\u8fd4\u56de\u4e86google.com\u3002<\/p>\n
[node1 ~]$ kubectl get svc\r\nNAME                  TYPE           CLUSTER-IP   EXTERNAL-IP   PORT(S)    AGE\r\ngoogle-externalname   ExternalName   <none>       google.com    <none>     5s\r\nkubernetes            ClusterIP      10.96.0.1    <none>        443\/TCP    2h\r\nmy-nginx-svc          ClusterIP      None         <none>        8080\/TCP   16m\r\n[node1 ~]$ dig google-externalname.default.svc.cluster.local @10.96.0.10\r\n\r\n; <<>> DiG 9.9.4-RedHat-9.9.4-73.el7_6 <<>> google-externalname.default.svc.cluster.local @10.96.0.10\r\n;; global options: +cmd\r\n;; Got answer:\r\n;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20827\r\n;; flags: qr aa 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;google-externalname.default.svc.cluster.local. IN A\r\n\r\n;; ANSWER SECTION:\r\ngoogle-externalname.default.svc.cluster.local. 5 IN CNAME google.com.\r\ngoogle.com.             5       IN      A       172.217.168.206\r\n\r\n;; Query time: 10 msec\r\n;; SERVER: 10.96.0.10#53(10.96.0.10)\r\n;; WHEN: Sat Mar 09 09:31:56 UTC 2019\r\n;; MSG SIZE  rcvd: 169\r\n<\/code><\/pre>\n
\u4ec0\u4e48\u8ba9\u4f60\u611f\u5230\u9ad8\u5174\uff1f<\/h2>\n
\u4ee5\u5f80\u6211\u4eec\u9700\u8981\u81ea\u884c\u7ba1\u7406IP\u548c\u7ec8\u7aef\u70b9\u3002\u7279\u522b\u662f\u5728\u751f\u4ea7\u73af\u5883\u548c\u5206\u6bb5\u73af\u5883\u4e2d\uff0c\u5982\u679c\u7ec8\u7aef\u70b9\u4e0d\u540c\uff0c\u9700\u8981\u5728\u5e94\u7528\u7a0b\u5e8f\u7684\u914d\u7f6e\u6587\u4ef6\u4e2d\u5199\u5165\u5404\u81ea\u7ec8\u7aef\u70b9\u7684\u4e3b\u673a\u540d\uff0c\u7136\u540e\u5728\u8fd0\u884c\u65f6\u8fdb\u884c\u5206\u914d\u548c\u5e94\u7528\u3002<\/p>\n
\u4e00\u65b9\u3001\u4e0a\u306e\u4ed5\u7d44\u307f\u306a\u3089IP\u3084\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u306e\u540d\u524d\u306e\u7ba1\u7406\u3092\u3059\u308b\u5fc5\u8981\u304c\u305d\u3082\u305d\u3082\u306a\u304f\u306a\u308b\u3002Kubernetes\u3067\u3053\u306e\u6a5f\u80fd\u304c\u4e00\u756a\u611f\u52d5\u3057\u305f\u3002<\/p>\n
\u6765\u81ea\u5916\u90e8\u7684\u8bbf\u95ee de<\/h1>\n
\u5f53\u5728\u516c\u5f00\u7f51\u7ad9\u7b49\u65f6\u9700\u8981\u4ece\u5916\u90e8\u8bbf\u95ee\u65f6\uff0c\u53ef\u4ee5\u9009\u62e9\u4f7f\u7528\u8d1f\u8f7d\u5747\u8861\u5668\u6216Ingress\u6765\u5b9e\u73b0\u3002\u4e0d\u505a\u8fc7\u591a\u8be6\u7ec6\u4ecb\u7ecd\u3002<\/p>\n
\u8fd9\u4e9b\u5dee\u522b\u5728\u8fd9\u91cc\u6709\u8be6\u7ec6\u89e3\u91ca\u3002<\/p>\n
    Kubernetes NodePort vs LoadBalancer vs Ingress? When should I use what?<\/ul>\n
    \u305d\u308c\u305e\u308c\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5fb4\u304c\u3042\u308b\u3002<\/p>\n
      \n
    • \n
        LoadBalancer<\/ul>\n<\/li>\n<\/ul>\n
        L4\u306e\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b7\u30f3\u30b0<\/p>\n
        Ingress<\/p>\n
        L7\u306e\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b7\u30f3\u30b0
        \n\u30d1\u30b9\u30d9\u30fc\u30b9\u3067\u306e\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0
        \nSSL\/TSL\u306e\u7d42\u7aef\u306b\u306a\u308b\u3002
        \n\u5b9f\u88c5\u306fNginx\u306a\u3069\u3002<\/p>\n
        \u6211\u672c\u6765\u60f3\u5199\u4e66\u7684\uff0c\u4f46\u540e\u6765\u653e\u5f03\u4e86\u3002<\/h1>\n
          \n
        • \n
            NetworkPolicy<\/ul>\n<\/li>\n<\/ul>\n
             <\/p>\n
              Kafka Cluster(Zookeeper\u3082\u542b\u3080) \u3092StatefulSet\u3067k8s\u4e0a\u306b\u30c7\u30d7\u30ed\u30a4\u3057\u3066\u307f\u308b\u3002<\/ul>\n
              \u8bf7\u53c2\u7167\u4ee5\u4e0b\u6750\u6599\u3002<\/h1>\n
                AKS\u3067NetworkPolicy\u3092\u6709\u52b9\u306b\u3059\u308b: https:\/\/docs.microsoft.com\/ja-jp\/azure\/aks\/use-network-policies#code-try-0<\/ul>\n","protected":false},"excerpt":{"rendered":"
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