Kubernetes in your Local Ubuntu vm

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Problems: I am new in kuberenetes, docker ,vagrant ,sonarqube, jenkins. so if you want to explore in your localvm about kubernetes then you have to setup that kubernetes cluster in your local vm.

I am providing here basic steps to setup kubernetes cluster in your local.

Assumptios: i'll setup master and node in one VM.same node will works as master and node both.


 Below are the basic steps:

 1. Install prerequisite software packages on both master and node(in our case only one vm)
$apt-get update

$apt-get install ssh curl vim


2.  Docker installation
sudo apt-get update

sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D


touch /etc/apt/sources.list.d/docker.list
echo deb https://apt.dockerproject.org/repo ubuntu-trusty main > /etc/apt/sources.list.d/docker.list
sudo apt-get update
sudo apt-get purge lxc-docker
sudo apt-cache policy docker-engine
sudo apt-get install docker-engine -y


3.ssh-keygen -t rsa

4.Copy the ssh id_rsa key locally ///  optional for passwordless auth
$ ssh-copy-id -i /root/.ssh/id_rsa.pub 127.0.0.1
5. In case this command fails please use this alternative solution in order to add the key //optional
$ cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
6.Validate the password-less ssh-login // optional passwordless auth test
$ ssh root@127.0.0.1
root@virtual-machine:~$ exit
logout
Connection to 127.0.0.1 closed

7. Get the Kubernetes release bundle from the official github repository



8. Untar the Kubernetes bundle in the same directory
$ tar -xvf kubernetes.tar.gz
We will build the binaries of Kubernetes code specifically for ubuntu cluster
9. Execute the following shell script
$ cd kubernetes/cluster/ubuntu  
 $ ./build.sh

10 .Configure the cluster information by editing only the following parameters of the filecluster/ubuntu/config-default.sh in the editor of your choice.

$ cd
$ vi kubernetes/cluster/ubuntu/config-default.sh
export nodes="root@127.0.0.1  root@172.16.1.8"
export roles="ai i"
export NUM_MINIONS=${NUM_MINIONS:-2}
export FLANNEL_NET=172.16.0.0/16

NOTE :- for multiple node need to edit export roles=("ai" "i" "i")   /// Script BUG

/* Only update the above mentioned information in the file, rest of the configuration will remain as it is. The first variable nodes defines all the cluster nodes, in our case same machine will be configured as master and node so it contains only one entry.The role below “ai” specifies that same machine will act as master, “a” stands for master and “i” stands for node.
Now, we will be starting the cluster with the following command; */

11. startup cluster configuration

$ cd kubernetes/cluster
$ KUBERNETES_PROVIDER=ubuntu ./kube-up.sh
Cluster validation succeeded
Done, listing cluster services:
Note :-  if validations


Kubernetes master is running at http://127.0.0.1:8080



12 .We will add kubectl binary to path in order to manage the Kubernetes cluster.

$ export PATH=$PATH:~/kubernetes/cluster/ubuntu/binaries //  to get command access
Now, we will validate if the K8s cluster created above is properly configured;
$ kubectl get nodes

NAME        LABELS                             STATUS
127.0.0.1   kubernetes.io/hostname=127.0.0.1   Ready
13. The Kubernetes UI can be accessed at the following address https://127.0.0.1:8080/ui . Suppose in case it is not accessible please run the following services and try again

// for UI configuration //optional

$ kubectl create -f addons/kube-ui/kube-ui-rc.yaml --namespace=kube-system
$ kubectl create -f addons/kube-ui/kube-ui-svc.yaml --namespace=kube-system
14 TO container monitor uI // Cadvisor

http://127.0.0.1:4194/containers/ // it can be ip of master instend of 127.0.0.1

15 To check other resource through UI

http://127.0.0.1:8080/ // and selected options

TO check kubernetes pod list
#kubernetes get pod
To get kubernetes services
#kubernetes get services

Run a container nginx (name my-nginx)  and running on 80 port(without replica)
#kubectl run-container my-nginx --image=nginx --port=80


TO create a container with yaml
#kubectl create -f replication.yaml


Replication/Scaling

Kubernetes container replication:-
1.pull image nginx at docker
#docker pull nginx
3.create a container with replication
# kubectl run my-nginxtest --image=nginx --replicas=2 --port=80
4.to check replication node
#kubectl get rc
5. to check replication node in POD
#kubectl get pod

6. create a load balancer for my-nginx container  
#kubectl expose rc my-nginxtest --port=80 --create-external-load-balancer
7.to check container full detials including IP
#kubectl describe pod my-nginxtest-h91jo
8. to stop replication service
Scaling replication
scaling our nginx replication
#kubectl scale --current-replicas=2 --replicas=3 replication controllers my-nginxtest

Note:if anybody facing some issue then plz contact me using comment section and provide suggestion

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