kubernetes-cheatsheet.txt

/---------------------------------------------------------------\
|  Author:      Lucian Maly <lucian.maly@oracle.com>            |
|  Last update: 2016-07-17                                      |
\---------------------------------------------------------------/


# PREPARE ENVIRONMENT FOR K8S
---------------------------
$ sudo apt-get update
$ sudo apt-gt install python curl
$ curl https://sdk.cloud.google.com | bash
$ gcloud auth login
$ gcloud config list project
$ gcloud config set project <PROJECT ID>


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# INSTALL LATEST K8S VERSION
--------------------------
$ curl -sS https://get.k8s.io | bash
$ $HOME/kubernetes/cluster/kube-up.sh
By default it will use gce provider
By default the cluster will have 4 minions

Configuration is stored:
$ vim $HOME/.kube/config

Binaries by default stored at:
$ $HOME/kubernetes/cluster


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# KUBERNETES UI
-------------
https://<your-master-IP>/api/v1/proxy/namespaces/kube-system/services/kube-ui
-summary of the minions, CPU, memory, used disk space, IP addresses

See the credentials for logging in to the above WebUI:
$ kubectl config view


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# GRAFANA UI
----------
https://<your-master-IP>/api/v1/proxy/namespaces/kube-system/services/monitor-grafana
-summary of the metrics on the cluster nodes - CPU, memory


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# SWAGGER
-------
https://<your-master-IP>/swagger-ui
-summary of the K8s RESTful API

i.e.
https://<your-master-IP>/api/v1/nodes/?pretty=true
https://<your-master-IP>/api/v1/nodes/?pretty=false

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# KUBECTL.SH
----------

-commands to explore our cluster and the workloads running on it
$ cd $HOME/kubernetes/cluster
$ chmod +x kubectl.sh
# Prepend a dot - the program will look in the current directory first, before searching the rest of the PATH
$ export PATH=".:$PATH"
# Append the Kubernetes path to the end:
$ export PATH=$PATH:/home/$USER/kubernetes/cluster
# To make changes permanent, add the export to the end of .bashrc in $HOME
$ ln -s kubectl.sh kubectl

Cluster summary (master, DNS, UI, Grafana, Heapster, InfluxDB) can be viewed by:
$ kubectl cluster-info

Listing the nodes in our cluster:
$ kubectl get nodes

List cluster events:
$ kubectl get events

See services that are running in the cluster:
$ kubectl get services
-you will only see one core API/monitoring/logging service called 'kubernetes' at the beginning

# K8S on AWS
----------


# WORKING WITH PODS
----------
```
# cat my-first-pod.yaml
apiVersion: v1
kind: Pod
    metadata:
name: my-first-pod
spec:
    containers:
    - name: my-nginx
      image: nginx
    - name: my-centos
      image: centos
      command: ["/bin/sh", "-c", "while : ;do curl http://localhost:80/; sleep 3; done"]
```

kubectl create -f my-first-pod.yaml pod "my-first-pod" created