github.com/qsunny/k8s@v0.0.0-20220101153623-e6dca256d5bf/examples-master/staging/explorer/README.md (about) 1 ### explorer 2 3 Explorer is a little container for examining the runtime environment Kubernetes produces for your pods. 4 5 The intended use is to substitute k8s.gcr.io/explorer for your intended container, and then visit it via the proxy. 6 7 Currently, you can look at: 8 * The environment variables to make sure Kubernetes is doing what you expect. 9 * The filesystem to make sure the mounted volumes and files are also what you expect. 10 * Perform DNS lookups, to see how DNS works. 11 12 `pod.yaml` is supplied as an example. You can control the port it serves on with the -port flag. 13 14 Example from command line (the DNS lookup looks better from a web browser): 15 16 ```console 17 $ kubectl create -f examples/explorer/pod.yaml 18 $ kubectl proxy & 19 Starting to serve on localhost:8001 20 21 $ curl localhost:8001/api/v1/proxy/namespaces/default/pods/explorer:8080/vars/ 22 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin 23 HOSTNAME=explorer 24 KIBANA_LOGGING_PORT_5601_TCP_PORT=5601 25 KUBERNETES_SERVICE_HOST=10.0.0.2 26 MONITORING_GRAFANA_PORT_80_TCP_PROTO=tcp 27 MONITORING_INFLUXDB_UI_PORT_80_TCP_PROTO=tcp 28 KIBANA_LOGGING_SERVICE_PORT=5601 29 MONITORING_HEAPSTER_PORT_80_TCP_PORT=80 30 MONITORING_INFLUXDB_UI_PORT_80_TCP_PORT=80 31 KIBANA_LOGGING_SERVICE_HOST=10.0.204.206 32 KIBANA_LOGGING_PORT_5601_TCP=tcp://10.0.204.206:5601 33 KUBERNETES_PORT=tcp://10.0.0.2:443 34 MONITORING_INFLUXDB_PORT=tcp://10.0.2.30:80 35 MONITORING_INFLUXDB_PORT_80_TCP_PROTO=tcp 36 MONITORING_INFLUXDB_UI_PORT=tcp://10.0.36.78:80 37 KUBE_DNS_PORT_53_UDP=udp://10.0.0.10:53 38 MONITORING_INFLUXDB_SERVICE_HOST=10.0.2.30 39 ELASTICSEARCH_LOGGING_PORT=tcp://10.0.48.200:9200 40 ELASTICSEARCH_LOGGING_PORT_9200_TCP_PORT=9200 41 KUBERNETES_PORT_443_TCP=tcp://10.0.0.2:443 42 ELASTICSEARCH_LOGGING_PORT_9200_TCP_PROTO=tcp 43 KIBANA_LOGGING_PORT_5601_TCP_ADDR=10.0.204.206 44 KUBE_DNS_PORT_53_UDP_ADDR=10.0.0.10 45 MONITORING_HEAPSTER_PORT_80_TCP_PROTO=tcp 46 MONITORING_INFLUXDB_PORT_80_TCP_ADDR=10.0.2.30 47 KIBANA_LOGGING_PORT=tcp://10.0.204.206:5601 48 MONITORING_GRAFANA_SERVICE_PORT=80 49 MONITORING_HEAPSTER_SERVICE_PORT=80 50 MONITORING_HEAPSTER_PORT_80_TCP=tcp://10.0.150.238:80 51 ELASTICSEARCH_LOGGING_PORT_9200_TCP=tcp://10.0.48.200:9200 52 ELASTICSEARCH_LOGGING_PORT_9200_TCP_ADDR=10.0.48.200 53 MONITORING_GRAFANA_PORT_80_TCP_PORT=80 54 MONITORING_HEAPSTER_PORT=tcp://10.0.150.238:80 55 MONITORING_INFLUXDB_PORT_80_TCP=tcp://10.0.2.30:80 56 KUBE_DNS_SERVICE_PORT=53 57 KUBE_DNS_PORT_53_UDP_PORT=53 58 MONITORING_GRAFANA_PORT_80_TCP_ADDR=10.0.100.174 59 MONITORING_INFLUXDB_UI_SERVICE_HOST=10.0.36.78 60 KIBANA_LOGGING_PORT_5601_TCP_PROTO=tcp 61 MONITORING_GRAFANA_PORT=tcp://10.0.100.174:80 62 MONITORING_INFLUXDB_UI_PORT_80_TCP_ADDR=10.0.36.78 63 KUBE_DNS_SERVICE_HOST=10.0.0.10 64 KUBERNETES_PORT_443_TCP_PORT=443 65 MONITORING_HEAPSTER_PORT_80_TCP_ADDR=10.0.150.238 66 MONITORING_INFLUXDB_UI_SERVICE_PORT=80 67 KUBE_DNS_PORT=udp://10.0.0.10:53 68 ELASTICSEARCH_LOGGING_SERVICE_HOST=10.0.48.200 69 KUBERNETES_SERVICE_PORT=443 70 MONITORING_HEAPSTER_SERVICE_HOST=10.0.150.238 71 MONITORING_INFLUXDB_SERVICE_PORT=80 72 MONITORING_INFLUXDB_PORT_80_TCP_PORT=80 73 KUBE_DNS_PORT_53_UDP_PROTO=udp 74 MONITORING_GRAFANA_PORT_80_TCP=tcp://10.0.100.174:80 75 ELASTICSEARCH_LOGGING_SERVICE_PORT=9200 76 MONITORING_GRAFANA_SERVICE_HOST=10.0.100.174 77 MONITORING_INFLUXDB_UI_PORT_80_TCP=tcp://10.0.36.78:80 78 KUBERNETES_PORT_443_TCP_PROTO=tcp 79 KUBERNETES_PORT_443_TCP_ADDR=10.0.0.2 80 HOME=/ 81 82 $ curl localhost:8001/api/v1/proxy/namespaces/default/pods/explorer:8080/fs/ 83 mount/ 84 var/ 85 .dockerenv 86 etc/ 87 dev/ 88 proc/ 89 .dockerinit 90 sys/ 91 README.md 92 explorer 93 94 $ curl localhost:8001/api/v1/proxy/namespaces/default/pods/explorer:8080/dns?q=elasticsearch-logging 95 <html><head></head><body> 96 <form action="/api/v1/proxy/namespaces/default/pods/explorer:8080/dns"> 97 <input name="q" type="text" value="elasticsearch-logging"/> 98 <button type="submit">Lookup</button> 99 </form> 100 <br/><br/><pre>LookupNS(elasticsearch-logging): 101 Result: ([]*net.NS)<nil> 102 Error: <*>lookup elasticsearch-logging: no such host 103 104 LookupTXT(elasticsearch-logging): 105 Result: ([]string)<nil> 106 Error: <*>lookup elasticsearch-logging: no such host 107 108 LookupSRV("", "", elasticsearch-logging): 109 cname: elasticsearch-logging.default.svc.cluster.local. 110 Result: ([]*net.SRV)[<*>{Target:(string)elasticsearch-logging.default.svc.cluster.local. Port:(uint16)9200 Priority:(uint16)10 Weight:(uint16)100}] 111 Error: <nil> 112 113 LookupHost(elasticsearch-logging): 114 Result: ([]string)[10.0.60.245] 115 Error: <nil> 116 117 LookupIP(elasticsearch-logging): 118 Result: ([]net.IP)[10.0.60.245] 119 Error: <nil> 120 121 LookupMX(elasticsearch-logging): 122 Result: ([]*net.MX)<nil> 123 Error: <*>lookup elasticsearch-logging: no such host 124 125 </nil></nil></nil></nil></nil></nil></pre> 126 127 </body></html> 128 ``` 129 130 131 <!-- BEGIN MUNGE: GENERATED_ANALYTICS --> 132 []() 133 <!-- END MUNGE: GENERATED_ANALYTICS -->