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02-compute-resources.md

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Provisioning Compute Resources

Note: You must have VirtualBox and Vagrant configured at this point

Download this github repository and cd into the vagrant folder

git clone https://github.com/mmumshad/kubernetes-the-hard-way.git

CD into vagrant directory

cd kubernetes-the-hard-way\vagrant

Run Vagrant up

vagrant up

This does the below:

  • Deploys 5 VMs - 2 Master, 2 Worker and 1 Loadbalancer with the name 'kubernetes-ha-* '

    This is the default settings. This can be changed at the top of the Vagrant file

  • Set's IP addresses in the range 192.168.5

    VM VM Name Purpose IP Forwarded Port
    master-1 kubernetes-ha-master-1 Master 192.168.5.11 2711
    master-2 kubernetes-ha-master-2 Master 192.168.5.12 2712
    worker-1 kubernetes-ha-worker-1 Worker 192.168.5.21 2721
    worker-2 kubernetes-ha-worker-2 Worker 192.168.5.22 2722
    loadbalancer kubernetes-ha-lb LoadBalancer 192.168.5.30 2730

    These are the default settings. These can be changed in the Vagrant file

  • Add's a DNS entry to each of the nodes to access internet

    DNS: 8.8.8.8

  • Install's Docker on Worker nodes

  • Runs the below command on all nodes to allow for network forwarding in IP Tables. This is required for kubernetes networking to function correctly.

    sysctl net.bridge.bridge-nf-call-iptables=1

SSH to the nodes

There are two ways to SSH into the nodes:

1. SSH using Vagrant

From the directory you ran the vagrant up command, run vagrant ssh <vm> for example vagrant ssh master-1.

Note: Use VM field from the above table and not the vm name itself.

2. SSH Using SSH Client Tools

Use your favourite SSH Terminal tool (putty).

Use the above IP addresses. Username and password based SSH is disabled by default. Vagrant generates a private key for each of these VMs. It is placed under the .vagrant folder (in the directory you ran the vagrant up command from) at the below path for each VM:

Private Key Path: .vagrant/machines/<machine name>/virtualbox/private_key

Username: vagrant

Verify Environment

  • Ensure all VMs are up
  • Ensure VMs are assigned the above IP addresses
  • Ensure you can SSH into these VMs using the IP and private keys
  • Ensure the VMs can ping each other
  • Ensure the worker nodes have Docker installed on them. Version: 18.06

    command sudo docker version

Troubleshooting Tips

If any of the VMs failed to provision, or is not configured correct, delete the vm using the command:

vagrant destroy <vm>

Then reprovision. Only the missing VMs will be re-provisioned

vagrant up

Sometimes the delete does not delete the folder created for the vm and throws the below error.

VirtualBox error:

VBoxManage.exe: error: Could not rename the directory 'D:\VirtualBox VMs\ubuntu-bionic-18.04-cloudimg-20190122_1552891552601_76806' to 'D:\VirtualBox VMs\kubernetes-ha-worker-2' to save the settings file (VERR_ALREADY_EXISTS)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component SessionMachine, interface IMachine, callee IUnknown
VBoxManage.exe: error: Context: "SaveSettings()" at line 3105 of file VBoxManageModifyVM.cpp

In such cases delete the VM, then delete teh VM folder and then re-provision

vagrant destroy <vm>

rmdir "<path-to-vm-folder>\kubernetes-ha-worker-2"

vagrant up