This directory contains two pod specifications which can be used as synthetic logging sources. The pod specification in synthetic_0_25lps.yaml describes a pod that just emits a log message once every 4 seconds:
# This pod specification creates an instance of a synthetic logger. The logger
# is simply a program that writes out the hostname of the pod, a count which increments
# by one on each iteration (to help notice missing log enteries) and the date using
# a long format (RFC-3339) to nano-second precision. This program logs at a frequency
# of 0.25 lines per second. The shellscript program is given directly to bash as -c argument
# and could have been written out as:
# i="0"
# while true
# do
# echo -n "`hostname`: $i: "
# date --rfc-3339 ns
# sleep 4
# i=$[$i+1]
# done
apiVersion: v1
kind: Pod
metadata:
labels:
name: synth-logging-source
name: synthetic-logger-0.25lps-pod
spec:
containers:
- args:
- bash
- -c
- 'i="0"; while true; do echo -n "`hostname`: $i: "; date --rfc-3339 ns; sleep
4; i=$[$i+1]; done'
image: ubuntu:14.04
name: synth-lgr
The other YAML file synthetic_10lps.yaml specifies a similar synthetic logger that emits 10 log messages every second. To run both synthetic loggers:
$ make up
../../cluster/kubectl.sh create -f synthetic_0_25lps.yaml
pods/synthetic-logger-0.25lps-pod
../../cluster/kubectl.sh create -f synthetic_10lps.yaml
pods/synthetic-logger-10lps-pod
Visiting the Kibana dashboard should make it clear that logs are being collected from the two synthetic loggers:
You can report the running pods, replication controllers, and services with another Makefile rule:
$ make get
../../cluster/kubectl.sh get pods
NAME READY REASON RESTARTS AGE
elasticsearch-logging-v1-gzknt 1/1 Running 0 11m
elasticsearch-logging-v1-swgzc 1/1 Running 0 11m
fluentd-elasticsearch-kubernetes-minion-1rtv 1/1 Running 0 11m
fluentd-elasticsearch-kubernetes-minion-6bob 1/1 Running 0 10m
fluentd-elasticsearch-kubernetes-minion-98g3 1/1 Running 0 10m
fluentd-elasticsearch-kubernetes-minion-qduc 1/1 Running 0 10m
kibana-logging-v1-1w44h 1/1 Running 0 11m
kube-dns-v3-i8u9s 3/3 Running 0 11m
monitoring-heapster-v1-mles8 0/1 Running 11 11m
synthetic-logger-0.25lps-pod 1/1 Running 0 42s
synthetic-logger-10lps-pod 1/1 Running 0 41s
../../cluster/kubectl.sh get replicationControllers
CONTROLLER CONTAINER(S) IMAGE(S) SELECTOR REPLICAS
elasticsearch-logging-v1 elasticsearch-logging gcr.io/google_containers/elasticsearch:1.4 k8s-app=elasticsearch-logging,version=v1 2
kibana-logging-v1 kibana-logging gcr.io/google_containers/kibana:1.3 k8s-app=kibana-logging,version=v1 1
kube-dns-v3 etcd gcr.io/google_containers/etcd:2.0.9 k8s-app=kube-dns,version=v3 1
kube2sky gcr.io/google_containers/kube2sky:1.9
skydns gcr.io/google_containers/skydns:2015-03-11-001
monitoring-heapster-v1 heapster gcr.io/google_containers/heapster:v0.13.0 k8s-app=heapster,version=v1 1
../../cluster/kubectl.sh get services
NAME LABELS SELECTOR IP(S) PORT(S)
elasticsearch-logging k8s-app=elasticsearch-logging,kubernetes.io/cluster-service=true,kubernetes.io/name=Elasticsearch k8s-app=elasticsearch-logging 10.0.145.125 9200/TCP
kibana-logging k8s-app=kibana-logging,kubernetes.io/cluster-service=true,kubernetes.io/name=Kibana k8s-app=kibana-logging 10.0.189.192 5601/TCP
kube-dns k8s-app=kube-dns,kubernetes.io/cluster-service=true,kubernetes.io/name=KubeDNS k8s-app=kube-dns 10.0.0.10 53/UDP
53/TCP
kubernetes component=apiserver,provider=kubernetes <none> 10.0.0.1 443/TCP
The net rule in the Makefile will report information about the Elasticsearch and Kibana services including the public IP addresses of each service.
$ make net
../../cluster/kubectl.sh get services elasticsearch-logging -o json
{
"kind": "Service",
"apiVersion": "v1",
"metadata": {
"name": "elasticsearch-logging",
"namespace": "default",
"selfLink": "/api/v1/namespaces/default/services/elasticsearch-logging",
"uid": "e056e116-0fb4-11e5-9243-42010af0d13a",
"resourceVersion": "23",
"creationTimestamp": "2015-06-10T21:08:43Z",
"labels": {
"k8s-app": "elasticsearch-logging",
"kubernetes.io/cluster-service": "true",
"kubernetes.io/name": "Elasticsearch"
}
},
"spec": {
"ports": [
{
"protocol": "TCP",
"port": 9200,
"targetPort": "es-port",
"nodePort": 0
}
],
"selector": {
"k8s-app": "elasticsearch-logging"
},
"clusterIP": "10.0.145.125",
"type": "ClusterIP",
"sessionAffinity": "None"
},
"status": {
"loadBalancer": {}
}
}
../../cluster/kubectl.sh get services kibana-logging -o json
{
"kind": "Service",
"apiVersion": "v1",
"metadata": {
"name": "kibana-logging",
"namespace": "default",
"selfLink": "/api/v1/namespaces/default/services/kibana-logging",
"uid": "e05c7dae-0fb4-11e5-9243-42010af0d13a",
"resourceVersion": "30",
"creationTimestamp": "2015-06-10T21:08:43Z",
"labels": {
"k8s-app": "kibana-logging",
"kubernetes.io/cluster-service": "true",
"kubernetes.io/name": "Kibana"
}
},
"spec": {
"ports": [
{
"protocol": "TCP",
"port": 5601,
"targetPort": "kibana-port",
"nodePort": 0
}
],
"selector": {
"k8s-app": "kibana-logging"
},
"clusterIP": "10.0.189.192",
"type": "ClusterIP",
"sessionAffinity": "None"
},
"status": {
"loadBalancer": {}
}
}
To find the URLs to access the Elasticsearch and Kibana viewer,
$ kubectl cluster-info
Kubernetes master is running at https://104.154.60.226
Elasticsearch is running at https://104.154.60.226/api/v1beta3/proxy/namespaces/default/services/elasticsearch-logging
Kibana is running at https://104.154.60.226/api/v1beta3/proxy/namespaces/default/services/kibana-logging
KubeDNS is running at https://104.154.60.226/api/v1beta3/proxy/namespaces/default/services/kube-dns
To find the user name and password to access the URLs,
$ kubectl config view
apiVersion: v1
clusters:
- cluster:
certificate-authority-data: REDACTED
server: https://104.154.60.226
name: lithe-cocoa-92103_kubernetes
contexts:
- context:
cluster: lithe-cocoa-92103_kubernetes
user: lithe-cocoa-92103_kubernetes
name: lithe-cocoa-92103_kubernetes
current-context: lithe-cocoa-92103_kubernetes
kind: Config
preferences: {}
users:
- name: lithe-cocoa-92103_kubernetes
user:
client-certificate-data: REDACTED
client-key-data: REDACTED
token: 65rZW78y8HxmXXtSXuUw9DbP4FLjHi4b
- name: lithe-cocoa-92103_kubernetes-basic-auth
user:
password: h5M0FtVXXflBSdI7
username: admin
Access the Elasticsearch service at URL https://104.154.60.226/api/v1/proxy/namespaces/default/services/elasticsearch-logging, use the user name 'admin' and password 'h5M0FtVXXflBSdI7',
{
"status" : 200,
"name" : "Major Mapleleaf",
"cluster_name" : "kubernetes_logging",
"version" : {
"number" : "1.4.4",
"build_hash" : "c88f77ffc81301dfa9dfd81ca2232f09588bd512",
"build_timestamp" : "2015-02-19T13:05:36Z",
"build_snapshot" : false,
"lucene_version" : "4.10.3"
},
"tagline" : "You Know, for Search"
}
Visiting the URL https://104.154.60.226/api/v1/proxy/namespaces/default/services/kibana-logging should show the Kibana viewer for the logging information stored in the Elasticsearch service.