Simple-CNI

The simplest CNI made in Shell Scripting

Author

Number	Name	Email
98678	Bruno Freitas	mailto:bruno.freitas@tecnico.ulisboa.pt

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Table of Contents

• Project Structure
• Requirements
• Installation

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Project Structure

The folder structure of this project is as follows:

|- install-cni.sh
|- install.sh
|- uninstall.sh
\- cni
    |- simple-cni
    \- simple-cni.conf

• At the root there is the install-cni.sh script to install the CNI in each node. Basically, it copies the necessary files to each machine and execute the install.sh script.
• The install.sh script is the local installation on the node. It is responsible to do the basic configuration of the CNI.
• The uninstall.sh script is to uninstall the CNI. By executing this script on each file, all the CNI resources are deleted.
• The cni folder contains the CNI binary and a CNI configuration file example. Inside of this folder there is:
  • The simple-cni CNI binary (in thi case, a shell script).
  • The simple-cni.conf CNI configuration file.

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Requirements

a. Each K8s node has installed the 'rsync' tool. Do it by running:

apt-get install -y rsync

b. Each K8s node has installed the 'jq' tool. Do it by running:

apt-get install -y jq

c. Each K8s node has ssh keys. Do it by running:

ssh-keygen -t rsa -b 4096

d. Enable SSH access for the root user account. Do it by running:

echo "PermitRootLogin yes" >> /etc/ssh/sshd_config && systemctl restart sshd

e. Enable passwordless SSH for each K8s note. Do it by running:

ssh-copy-id -i /root/.ssh/id_rsa.pub <user>@<K8s-node>

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Installation

To install this CNI run the following commands on root:

1. Give previledges to run the installation script

chmod +x install-cni.sh

2. Run the installation scrip

./install-cni.sh