explorer

command

v1.7.0-beta.3 Latest Latest Go to latest Published: Jun 20, 2017 License: Apache-2.0 Imports: 7 Imported by: 0

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Repository

github.com/tedyu/kubernetes

README ¶

explorer

Explorer is a little container for examining the runtime environment Kubernetes produces for your pods.

The intended use is to substitute gcr.io/google_containers/explorer for your intended container, and then visit it via the proxy.

Currently, you can look at:

The environment variables to make sure Kubernetes is doing what you expect.
The filesystem to make sure the mounted volumes and files are also what you expect.
Perform DNS lookups, to see how DNS works.

pod.yaml is supplied as an example. You can control the port it serves on with the -port flag.

Example from command line (the DNS lookup looks better from a web browser):

$ kubectl create -f examples/explorer/pod.yaml
$ kubectl proxy &
Starting to serve on localhost:8001

$ curl localhost:8001/api/v1/proxy/namespaces/default/pods/explorer:8080/vars/
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=explorer
KIBANA_LOGGING_PORT_5601_TCP_PORT=5601
KUBERNETES_SERVICE_HOST=10.0.0.2
MONITORING_GRAFANA_PORT_80_TCP_PROTO=tcp
MONITORING_INFLUXDB_UI_PORT_80_TCP_PROTO=tcp
KIBANA_LOGGING_SERVICE_PORT=5601
MONITORING_HEAPSTER_PORT_80_TCP_PORT=80
MONITORING_INFLUXDB_UI_PORT_80_TCP_PORT=80
KIBANA_LOGGING_SERVICE_HOST=10.0.204.206
KIBANA_LOGGING_PORT_5601_TCP=tcp://10.0.204.206:5601
KUBERNETES_PORT=tcp://10.0.0.2:443
MONITORING_INFLUXDB_PORT=tcp://10.0.2.30:80
MONITORING_INFLUXDB_PORT_80_TCP_PROTO=tcp
MONITORING_INFLUXDB_UI_PORT=tcp://10.0.36.78:80
KUBE_DNS_PORT_53_UDP=udp://10.0.0.10:53
MONITORING_INFLUXDB_SERVICE_HOST=10.0.2.30
ELASTICSEARCH_LOGGING_PORT=tcp://10.0.48.200:9200
ELASTICSEARCH_LOGGING_PORT_9200_TCP_PORT=9200
KUBERNETES_PORT_443_TCP=tcp://10.0.0.2:443
ELASTICSEARCH_LOGGING_PORT_9200_TCP_PROTO=tcp
KIBANA_LOGGING_PORT_5601_TCP_ADDR=10.0.204.206
KUBE_DNS_PORT_53_UDP_ADDR=10.0.0.10
MONITORING_HEAPSTER_PORT_80_TCP_PROTO=tcp
MONITORING_INFLUXDB_PORT_80_TCP_ADDR=10.0.2.30
KIBANA_LOGGING_PORT=tcp://10.0.204.206:5601
MONITORING_GRAFANA_SERVICE_PORT=80
MONITORING_HEAPSTER_SERVICE_PORT=80
MONITORING_HEAPSTER_PORT_80_TCP=tcp://10.0.150.238:80
ELASTICSEARCH_LOGGING_PORT_9200_TCP=tcp://10.0.48.200:9200
ELASTICSEARCH_LOGGING_PORT_9200_TCP_ADDR=10.0.48.200
MONITORING_GRAFANA_PORT_80_TCP_PORT=80
MONITORING_HEAPSTER_PORT=tcp://10.0.150.238:80
MONITORING_INFLUXDB_PORT_80_TCP=tcp://10.0.2.30:80
KUBE_DNS_SERVICE_PORT=53
KUBE_DNS_PORT_53_UDP_PORT=53
MONITORING_GRAFANA_PORT_80_TCP_ADDR=10.0.100.174
MONITORING_INFLUXDB_UI_SERVICE_HOST=10.0.36.78
KIBANA_LOGGING_PORT_5601_TCP_PROTO=tcp
MONITORING_GRAFANA_PORT=tcp://10.0.100.174:80
MONITORING_INFLUXDB_UI_PORT_80_TCP_ADDR=10.0.36.78
KUBE_DNS_SERVICE_HOST=10.0.0.10
KUBERNETES_PORT_443_TCP_PORT=443
MONITORING_HEAPSTER_PORT_80_TCP_ADDR=10.0.150.238
MONITORING_INFLUXDB_UI_SERVICE_PORT=80
KUBE_DNS_PORT=udp://10.0.0.10:53
ELASTICSEARCH_LOGGING_SERVICE_HOST=10.0.48.200
KUBERNETES_SERVICE_PORT=443
MONITORING_HEAPSTER_SERVICE_HOST=10.0.150.238
MONITORING_INFLUXDB_SERVICE_PORT=80
MONITORING_INFLUXDB_PORT_80_TCP_PORT=80
KUBE_DNS_PORT_53_UDP_PROTO=udp
MONITORING_GRAFANA_PORT_80_TCP=tcp://10.0.100.174:80
ELASTICSEARCH_LOGGING_SERVICE_PORT=9200
MONITORING_GRAFANA_SERVICE_HOST=10.0.100.174
MONITORING_INFLUXDB_UI_PORT_80_TCP=tcp://10.0.36.78:80
KUBERNETES_PORT_443_TCP_PROTO=tcp
KUBERNETES_PORT_443_TCP_ADDR=10.0.0.2
HOME=/

$ curl localhost:8001/api/v1/proxy/namespaces/default/pods/explorer:8080/fs/
mount/
var/
.dockerenv
etc/
dev/
proc/
.dockerinit
sys/
README.md
explorer

$ curl localhost:8001/api/v1/proxy/namespaces/default/pods/explorer:8080/dns?q=elasticsearch-logging
<html><head></head><body>
<form action="/api/v1/proxy/namespaces/default/pods/explorer:8080/dns">
<input name="q" type="text" value="elasticsearch-logging"/>
<button type="submit">Lookup</button>
</form>
<br/><br/><pre>LookupNS(elasticsearch-logging):
Result: ([]*net.NS)<nil>
Error: &lt;*&gt;lookup elasticsearch-logging: no such host

LookupTXT(elasticsearch-logging):
Result: ([]string)<nil>
Error: &lt;*&gt;lookup elasticsearch-logging: no such host

LookupSRV(&#34;&#34;, &#34;&#34;, elasticsearch-logging):
cname: elasticsearch-logging.default.svc.cluster.local.
Result: ([]*net.SRV)[&lt;*&gt;{Target:(string)elasticsearch-logging.default.svc.cluster.local. Port:(uint16)9200 Priority:(uint16)10 Weight:(uint16)100}]
Error: <nil>

LookupHost(elasticsearch-logging):
Result: ([]string)[10.0.60.245]
Error: <nil>

LookupIP(elasticsearch-logging):
Result: ([]net.IP)[10.0.60.245]
Error: <nil>

LookupMX(elasticsearch-logging):
Result: ([]*net.MX)<nil>
Error: &lt;*&gt;lookup elasticsearch-logging: no such host

</nil></nil></nil></nil></nil></nil></pre>

</body></html>

Documentation ¶

Overview ¶

A tiny web server for viewing the environment kubernetes creates for your containers. It exposes the filesystem and environment variables via http server.

Source Files ¶

View all Source files

explorer.go

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