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Kubernetes Master & Node configuration
No. of instances 4 (1 – Master & Bot Framework; 3- Nodes) AWS Instance type m3.xlarge
OS Ubuntu 16.04 Xenial (64bit) Storage 200 GB
Mem (GiB) 15GB
vCPU 4
Software configuration
Kubernetes version: 1.7.3
Docker version Required: 1.12.6
Npm Version: 3.5.2
Node Version: 4.2.6
Elasticsearch Version: 5.4.1

Step 1: Installing kubelet and kubeadm on your hosts(to be followed in both Master and Slave)

1. apt-get update && apt-get install -y apt-transport-https
2. curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
3. cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
4. deb http://apt.kubernetes.io/ kubernetes-xenial main EOF
5. apt-get update
6. apt-get install docker.io
7. apt-get install -y kubelet kubeadm kubectl kubernetes-cni

Step 2: Initializing the master (Below Commands applicable only for master)

To initialize the master, pick one of the machines you previously installed kubeadm on, and run:

1. # kubeadm init
In case, kubernetes cluster configuration located in $HOME/.kube/config then run the following command
To start using your cluster, you need to run (as a regular user):
  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

  sudo chown $(id -u):$(id -g) $HOME/.kube/config

  export KUBECONFIG=$HOME/.kube/config

In case, kubernetes configuration located in $HOME/admin.conf then run the following commands:
To start using your cluster, run below commands as root user or prefix with sudo:
    cp /etc/kubernetes/admin.conf $HOME/

    chown $(id -u):$(id -g) $HOME/admin.conf

    export KUBECONFIG=$HOME/admin.conf

2. To create Kubernetes dashboard, run the following commands -

     # kubectl create -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml

3. Create a cluster role and bind all services then allow anonymous user to access Kube API
     If the below kubectl commands are not executed, you will get an error -U'ser "system:serviceaccount:default:default" cannot list pods in the namespace "default"'

• 1. kubectl create clusterrolebinding serviceaccounts-cluster-admin --clusterrole=cluster-admin --group=system:serviceaccounts
  2. kubectl create rolebinding bob-admin-binding --clusterrole=admin --user=system:anonymous --namespace=default

Execute the following commands in the Slave machines to connect to the Master machine:
    1. After kubeadm init, you will obtain a token as shown below-

      # kubeadm join --token <token id> <Primary IP>:6443

Above token helps slave to join master node. Token should run in all slaves once step 3 completes.

Master Isolation:

• kubectl taint nodes --all node-role.kubernetes.io/master-

This will remove the node-role.kubernetes.io/master taint from any nodes that have it, including the master node, meaning that the scheduler will then be able to schedule pods everywhere

Step 3: Installing a pod network(Below Commands applicable only for master)

You must install a pod network add-on so that your pods can communicate with each other.

go to addon hyperlink and get weave.net

    kubectl apply -f https://git.io/weave-kube-1.6

Step 4: Adding Slaves to Master node(Below Commands applicable only for slaves)

Run the obtained token given below from Step 2 in all slave nodes not needed to run in add-on server:

    kubeadm join --token <token id> <Primary IP>:6443
1. Post execution, go to the Master machine and run"kubectl get nodes", and verify if the nodes have joined the cluster.
2. Verify if all pods are up and running.
     #kubectl get pods --all-namespaces

You will get an output similar to the one shown below -

Image Modified

Here, assign bind_ip with public IP of your machine. Specify the dbpath and logpath according to your choice.
4) Make the mongodb user as mongodb. Usually the user will be mongodb by default. You may check it and skip this step if not required:
chown -R mongodb:mongodb /var/lib/mongodb

5) Start mongodb as a service:
sudo service mongodb start
You can check the status after starting mongodb by this command: sudo service mongodb status
6) Export your existing collections from your pre-existing mongodb service (if any):

    sudo mongoexport -db <db_name> -c <collection_name> --out <filename>.json

    [eg sudo mongoexport --db botstore -c BotCategory --out BotCat_bkp.json]
This will export all your collection data into a json file inside the present working directory. Now copy that json file into the machine where you have newly installed mongodb and execute the following command:
   sudo mongoimport --db <db_name> --collection <collection_name> < /path/to/exported_json
   [eg - sudo mongoimport --db botstore --collection BotCategory < /home/487398/BotCat_bkp.json]
This will import all you data into the new mongodb installation.
7) Restart the mongodb service:
    sudo service mongodb restart