134 lines
4.7 KiB
Markdown
134 lines
4.7 KiB
Markdown
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### explorer
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Explorer is a little container for examining the runtime environment Kubernetes produces for your pods.
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The intended use is to substitute gcr.io/google_containers/explorer for your intended container, and then visit it via the proxy.
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Currently, you can look at:
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* The environment variables to make sure Kubernetes is doing what you expect.
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* The filesystem to make sure the mounted volumes and files are also what you expect.
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* Perform DNS lookups, to see how DNS works.
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`pod.yaml` is supplied as an example. You can control the port it serves on with the -port flag.
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Example from command line (the DNS lookup looks better from a web browser):
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```console
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$ kubectl create -f examples/explorer/pod.yaml
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$ kubectl proxy &
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Starting to serve on localhost:8001
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$ curl localhost:8001/api/v1/proxy/namespaces/default/pods/explorer:8080/vars/
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PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
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HOSTNAME=explorer
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KIBANA_LOGGING_PORT_5601_TCP_PORT=5601
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KUBERNETES_SERVICE_HOST=10.0.0.2
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MONITORING_GRAFANA_PORT_80_TCP_PROTO=tcp
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MONITORING_INFLUXDB_UI_PORT_80_TCP_PROTO=tcp
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KIBANA_LOGGING_SERVICE_PORT=5601
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MONITORING_HEAPSTER_PORT_80_TCP_PORT=80
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MONITORING_INFLUXDB_UI_PORT_80_TCP_PORT=80
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KIBANA_LOGGING_SERVICE_HOST=10.0.204.206
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KIBANA_LOGGING_PORT_5601_TCP=tcp://10.0.204.206:5601
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KUBERNETES_PORT=tcp://10.0.0.2:443
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MONITORING_INFLUXDB_PORT=tcp://10.0.2.30:80
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MONITORING_INFLUXDB_PORT_80_TCP_PROTO=tcp
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MONITORING_INFLUXDB_UI_PORT=tcp://10.0.36.78:80
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KUBE_DNS_PORT_53_UDP=udp://10.0.0.10:53
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MONITORING_INFLUXDB_SERVICE_HOST=10.0.2.30
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ELASTICSEARCH_LOGGING_PORT=tcp://10.0.48.200:9200
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ELASTICSEARCH_LOGGING_PORT_9200_TCP_PORT=9200
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KUBERNETES_PORT_443_TCP=tcp://10.0.0.2:443
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ELASTICSEARCH_LOGGING_PORT_9200_TCP_PROTO=tcp
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KIBANA_LOGGING_PORT_5601_TCP_ADDR=10.0.204.206
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KUBE_DNS_PORT_53_UDP_ADDR=10.0.0.10
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MONITORING_HEAPSTER_PORT_80_TCP_PROTO=tcp
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MONITORING_INFLUXDB_PORT_80_TCP_ADDR=10.0.2.30
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KIBANA_LOGGING_PORT=tcp://10.0.204.206:5601
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MONITORING_GRAFANA_SERVICE_PORT=80
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MONITORING_HEAPSTER_SERVICE_PORT=80
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MONITORING_HEAPSTER_PORT_80_TCP=tcp://10.0.150.238:80
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ELASTICSEARCH_LOGGING_PORT_9200_TCP=tcp://10.0.48.200:9200
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ELASTICSEARCH_LOGGING_PORT_9200_TCP_ADDR=10.0.48.200
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MONITORING_GRAFANA_PORT_80_TCP_PORT=80
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MONITORING_HEAPSTER_PORT=tcp://10.0.150.238:80
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MONITORING_INFLUXDB_PORT_80_TCP=tcp://10.0.2.30:80
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KUBE_DNS_SERVICE_PORT=53
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KUBE_DNS_PORT_53_UDP_PORT=53
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MONITORING_GRAFANA_PORT_80_TCP_ADDR=10.0.100.174
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MONITORING_INFLUXDB_UI_SERVICE_HOST=10.0.36.78
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KIBANA_LOGGING_PORT_5601_TCP_PROTO=tcp
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MONITORING_GRAFANA_PORT=tcp://10.0.100.174:80
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MONITORING_INFLUXDB_UI_PORT_80_TCP_ADDR=10.0.36.78
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KUBE_DNS_SERVICE_HOST=10.0.0.10
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KUBERNETES_PORT_443_TCP_PORT=443
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MONITORING_HEAPSTER_PORT_80_TCP_ADDR=10.0.150.238
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MONITORING_INFLUXDB_UI_SERVICE_PORT=80
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KUBE_DNS_PORT=udp://10.0.0.10:53
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ELASTICSEARCH_LOGGING_SERVICE_HOST=10.0.48.200
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KUBERNETES_SERVICE_PORT=443
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MONITORING_HEAPSTER_SERVICE_HOST=10.0.150.238
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MONITORING_INFLUXDB_SERVICE_PORT=80
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MONITORING_INFLUXDB_PORT_80_TCP_PORT=80
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KUBE_DNS_PORT_53_UDP_PROTO=udp
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MONITORING_GRAFANA_PORT_80_TCP=tcp://10.0.100.174:80
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ELASTICSEARCH_LOGGING_SERVICE_PORT=9200
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MONITORING_GRAFANA_SERVICE_HOST=10.0.100.174
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MONITORING_INFLUXDB_UI_PORT_80_TCP=tcp://10.0.36.78:80
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KUBERNETES_PORT_443_TCP_PROTO=tcp
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KUBERNETES_PORT_443_TCP_ADDR=10.0.0.2
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HOME=/
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$ curl localhost:8001/api/v1/proxy/namespaces/default/pods/explorer:8080/fs/
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mount/
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var/
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.dockerenv
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etc/
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dev/
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proc/
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.dockerinit
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sys/
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README.md
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explorer
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$ curl localhost:8001/api/v1/proxy/namespaces/default/pods/explorer:8080/dns?q=elasticsearch-logging
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<html><head></head><body>
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<form action="/api/v1/proxy/namespaces/default/pods/explorer:8080/dns">
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<input name="q" type="text" value="elasticsearch-logging"/>
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<button type="submit">Lookup</button>
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</form>
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<br/><br/><pre>LookupNS(elasticsearch-logging):
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Result: ([]*net.NS)<nil>
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Error: <*>lookup elasticsearch-logging: no such host
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LookupTXT(elasticsearch-logging):
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Result: ([]string)<nil>
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Error: <*>lookup elasticsearch-logging: no such host
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LookupSRV("", "", elasticsearch-logging):
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cname: elasticsearch-logging.default.svc.cluster.local.
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Result: ([]*net.SRV)[<*>{Target:(string)elasticsearch-logging.default.svc.cluster.local. Port:(uint16)9200 Priority:(uint16)10 Weight:(uint16)100}]
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Error: <nil>
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LookupHost(elasticsearch-logging):
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Result: ([]string)[10.0.60.245]
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Error: <nil>
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LookupIP(elasticsearch-logging):
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Result: ([]net.IP)[10.0.60.245]
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Error: <nil>
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LookupMX(elasticsearch-logging):
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Result: ([]*net.MX)<nil>
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Error: <*>lookup elasticsearch-logging: no such host
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</nil></nil></nil></nil></nil></nil></pre>
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</body></html>
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```
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<!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
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[]()
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<!-- END MUNGE: GENERATED_ANALYTICS -->
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