Is Dockerless world a reality ?

Workshop on 15-December. Hosted by Prathidhwani Kochi @ Ahulya InfoPark

Prerequisites

• Laptop should be capable enough to run atleast one Fedora/Centos 7 VM instance.

  • 2 GB of RAM should be allocated for the VM
  • 2 vCPU should be allocated for the VM
  • Atleast 7GB of free space should be available on the partition where the VM image is downloaded or resides.

• Laptop should have Hypervisors installed Like VirtualBox,HyperV, KVM or Vmware Workstation

• Download the prebuilt image or download Fedora/Centos cloud image or install the required packages in your existing Virtual
  machine. Choose one of the below methods

  • Prebuilt Fedora 29 Images for the workshop

  • Using Fedora 29/Centos 7 cloud images

  • Package installation instruction for your existing Centos 7/Fedora 29VM

Pre-built Image Downloads

Import this pre-built image and create a new virtual machine

Image format	OS	hypervisor	Image download Link
Qcow2	Linux	KVM	https://goo.gl/fywwKG
VDI	Windows	VirtualBox	https://goo.gl/Ne6W5b
VDI	Linux	VirtualBox	https://goo.gl/Ne6W5b

Credentials

username: root
password: passw0rd

Cloud images for KVM

Outline

• Download Fedora 29 or Centos7 cloud image from the links given below
• Either download a prebuilt cloud init image or prepare one
• Before booting the VM for the first time, cloud init iso image should be attached to the VM
• Credentials for login: username: passowrd

Image format	OS	hypervisor	Image download Link	Credentials
Qcow2	Linux	KVM	Fedora 29 qcow2 Size 230MB	user: fedora password:passw0rd [sudo enabled]
Qcow2	Linux	KVM	Centos 7 qcow2 Size 252MB	user:centos password:passw0rd [sudo enabled]

• Create Cloud-init ISO file

You can use the pre-built cloud-init iso image by clicking here. If you are downloading the pre-built cloud init image, then proceed to Creating Virtual Machine

• Steps for Preparing cloud init image

Create a directory and two files should be created with the following contents. For example, path shown here is /vm. Replace the path as per your system configuration

        mkdir -p /vm/workshop
        cd /vm/workshop

The first file should be named as user-data. Include the following contents. Note password for the debian user is set as passw0rd. Change the password as required.

#cloud-config
password: passw0rd
chpasswd: { expire: False }
ssh_pwauth: True

Create another file called meta-data. Include the following contents. Hostname of the VM is set as debian-node-0

instance-id: workshop0
local-hostname: workshop-node-0

• Create an ISO image using the two files. Execute the following command. This will create an iso image called cloud-init-workshop.iso. genisoimage package should be installed on the system.

genisoimage -output cloud-init-workshop.iso -volid cidata -joliet -rock user-data meta-data

• Download the cloud based image to /vm/workshop

Creating the Virtual Machine

• Create the VM instance using command line tool. Package virt-install should be installed on the node. In the below command, modify the path mentioned after --disk. You have to modify two --disk paths. First path should point to qcow2 image.

virt-install --import --name workshopvm --memory 2048 --vcpus 1 --disk /vm/workshop/Fedora-Cloud-Base-29-1.2.x86_64.qcow2,format=qcow2,bus=virtio --disk /vm/workshop/cloud-init-workshop.iso,device=cdrom --network bridge=virbr0,model=virtio  --noautoconsole

• Execute virt-manager to access the VM or virsh console workshopvm. In the virsh command, workshopvm was the name of the VM that was created using the virt-install command. To exit from virsh command, use CTRL+]
• To login to the virtual machine, use the credentials mentioned in the above table.
• Proceed to Package installation Instruction mentioned below

Package Installation Instruction

1. Package installation using yum

yum install podman buildah docker skopeo docker-distribution cri-o 

2. Additional package

curl -OL https://github.com/wagoodman/dive/releases/download/v0.5.0/dive_0.5.0_linux_amd64.rpm
yum localinstall dive_0.5.0_linux_amd64.rpm

3. Download kubeadm as per instruction mentioned in the below document. Choose the appropriate method based on your OS https://kubernetes.io/docs/setup/independent/install-kubeadm/

Note: No need to SElinux to permisive mode at the install time. Just install the package. For Fedora

yum install -y kubelet kubeadm kubectl cri-tools --disableexcludes=kubernetes