centos 7 install k3s

To install k3s on CentOS 7, you can use the following steps. K3s is a lightweight Kubernetes distribution designed for use in resource-constrained environments.

1. Update System Packages:
   Ensure your system packages are up-to-date:

   sudo yum update
   

2. Disable SELinux:
   Temporarily disable SELinux as it may interfere with Kubernetes. You can modify the SELinux configuration file:

   sudo nano /etc/selinux/config
   

   Change the line SELINUX=enforcing to SELINUX=disabled, then save the file.

   Reboot your system for the changes to take effect:

   sudo reboot
   

3. Install k3s:
   Run the following command to install k3s:

   curl -sfL https://get.k3s.io | sh -
   

   This command will download and install k3s on your CentOS machine.

4. Access k3s:
   After the installation is complete, you can access the k3s cluster using kubectl. The kubectl configuration file is automatically created during the installation. You can find it at /etc/rancher/k3s/k3s.yaml.

   Copy the configuration file to your home directory:

   mkdir -p ~/.kube
   sudo cp /etc/rancher/k3s/k3s.yaml ~/.kube/config
   

   Make sure to adjust the file permissions:

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

   Now you can use kubectl to interact with your k3s cluster:

   kubectl get nodes
   

5. Uninstall k3s:
   If you ever need to uninstall k3s, you can use the following command:

   /usr/local/bin/k3s-uninstall.sh
   

   This script will stop and remove the k3s service along with its associated files.

That’s it! You should now have k3s installed on your CentOS 7 machine. Remember that k3s is designed to be lightweight and easy to use, making it a good choice for development and testing environments.