Setup 3 node Kubernetes Cluster on Ubuntu 18.04 with Weave Net CNI

Setup Kubernetes Worker Nodes

1. Step 1: Ensure Docker is installed (covered) Ensure docker engine is installed on all Worker nodes. ...
2. Step 2: Add Kubernetes repository ( covered) Ensure that repository for Kubenetes packages is added to the system. ...
3. Step 3: Install Kubenetes components. ...
4. Step 4: Join the Node to the Cluster:

1. How do you use CNI in Kubernetes?
2. How install CNI for Kubernetes?
3. How do you put weave in Kubernetes?
4. How do you set a Kubernetes cluster on premise?
5. What does CNI do in Kubernetes?
6. How do I know which CNI is used in Kubernetes?
7. How do I find my CNI version?
8. Which one is not Kubernetes installer?
9. Is Kube proxy a CNI?
10. How do you secure a weave scope?
11. Does weave support network policies?
12. What is POD eviction?

How do you use CNI in Kubernetes?

All of the CNI providers use a daemonset installation model, where their product deploys a Kubernetes Daemonset. Just use kubectl to install the provider on the master once the K8s API server has started. Please refer to each projects specific documentation.

How install CNI for Kubernetes?

Install CNI plugin

1. openssl req -newkey rsa:4096 \ -keyout cni.key \ -nodes \ -out cni.csr \ -subj "/CN=calico-cni"
2. sudo openssl x509 -req -in cni.csr \ -CA /etc/kubernetes/pki/ca.crt \ -CAkey /etc/kubernetes/pki/ca.key \ -CAcreateserial \ -out cni.crt \ -days 365 sudo chown ubuntu:ubuntu cni.crt.

How do you put weave in Kubernetes?

Weave Net for NetworkPolicy

1. Before you begin. You need to have a Kubernetes cluster. ...
2. Install the Weave Net addon. Follow the Integrating Kubernetes via the Addon guide. ...
3. Test the installation. Verify that the weave works. ...
4. What's next.

How do you set a Kubernetes cluster on premise?

How to do this?

1. Step 1: The container runtime. First up, you will need to install a runtime for your containers to run in. ...
2. Step 2: Installing kubeadm. What is kubeadm? ...
3. Step 3: Starting the Kubernetes cluster. Launching the cluster is “as easy” as running kubeadm init . ...
4. Step 4: Joining a node to the Kubernetes cluster.

What does CNI do in Kubernetes?

Using this CNI plugin allows Kubernetes pods to have the same IP address inside the pod as they do on the VPC network. The CNI allocates AWS Elastic Networking Interfaces (ENIs) to each Kubernetes node and using the secondary IP range from each ENI for pods on the node.

How do I know which CNI is used in Kubernetes?

1 Answer. if you list the pods in kube-system namespace, you can see the pods. The pod's names will be started with weave-net-xxxxx. Since it is Deamonset object, the pod's count will be based on your k8s nodes.

How do I find my CNI version?

To get a newer version of the CNI plugin on existing clusters, you must manually upgrade the plugin. We recommend that latest 1.7 patch version. You can view the latest patch version , view the different releases available for the plugin, and read the release notes for each version on GitHub .

Which one is not Kubernetes installer?

Terraform & Ansible

Terraform is not a Kubernetes installation tool on its own. But because it allows you to turn installation tasks into declarative infrastructure, it's a great way to script repeatable tasks which can then be checked into a version control system like Git.

Is Kube proxy a CNI?

Kube-proxy is responsible for communicating with the master node and routing. CNI provides connectivity by assigning IP addresses to pods and services, and reachability through its routing deamon.

How do you secure a weave scope?

Securing Scope in Kubernetes

1. Don't run Scope as a public service. The same recommendation goes for all administration tools, from the Kubernetes Dashboard to Scope. ...
2. Don't grant Scope admin permission. ...
3. Make sure Scope access is authenticated. ...
4. Block access to sensitive services at the network level.

Does weave support network policies?

The Weave Net Addon for Kubernetes comes with a Network Policy Controller. ... Once you have installed the Weave Net Addon you can follow the NetworkPolicy getting started guide to try out Kubernetes NetworkPolicy.

What is POD eviction?

Pod evicted problems

When a node in a Kubernetes cluster is running out of memory or disk, it activates a flag signaling that it is under pressure. ... At that moment, kubelet starts to reclaim resources, killing containers and declaring pods as failed until the resource usage is under the eviction threshold again.