kubernetes-localhost

Due to be updated, it works, but some approaches need to be reworked. Deploys Kubernetes with loadbalancer, dashboard, persistent storage, and monitoring on local machine using Vagrant.

By default you get 1 master, 2 working nodes, NFS server, loadbalancer, monitoring, image registry, and deployed dashboard.

Version of deployed Kubernetes cluster is 1.20.1, version of Ubuntu VirtualBox image is 18.04.

Dashboard

Dashboard is available via port 30000 on worker nodes. If you didn't change network ip range or number of worker nodes in Vagrantfile, dashboard will be available on both:

• https://192.168.100.101:30000
• https://192.168.100.102:30000

Note: In order to access dashboard via Chromium based browsers, you'll have to bypass invalid error certificate error on above mentioned URLs. In order to do that, just type thisisunsafe while on dashboard page. You don't need any input field, just typing it while on that page will do the trick.

Storage

Persistent volume pv-nfs and 5GB persistent volume claim pvc-nfs are provided automatically. For examples on how to use/create your own pv/pvc, check /storage directory.

Load-balancer

For bare-metal loadbalancing purposes MetalLB is used. For deployment manifests check /lb directory.

Monitoring

Prometheus operator is installed, if you wish to consume it, check example in monitoring/prometheus-example.yaml. Full blown setup with node-exporter, kube-state-metrics, alertmanager, and Grafana is a bit too resource expensive for what this project aims to achieve.

Image registry

Docker Registry v2 is used for image registry inside of the cluster. If you wish to use it, you can access it on port 30001. Simple web ui is hosted on port 30002 (check endpoints in docker-registry namespace). You will have to add insecure registry entry to your docker daemon.

Note: In case web ui is not showing repositories properly, check REGISTRY_URL in its deployment, and make sure it has proper value.

Requirements

• Vagrant
• VirtualBox

Note: Vagrantfile uses ansible_local module, which means you don't need Ansible installed on your workstation. However, if you already have it installed, and prefer to use that instead of letting Vagrant install Ansible on each node separately, change *vm.provision from ansible_local to ansible in Vagrantfile.

Another option is having dedicated "controller" node, which can be used as Ansible host. You can learn more by visiting this link.

How-To Manual

New setup:

• Clone this repository
• Run vagrant up

Poweroff machines:

• Run vagrant halt

Checking nodes status:

• Run vagrant status

Accessing master/worker nodes:

• While in project directory, type:

vagrant ssh $NAME_OF_THE_NODE

Example:

vagrant ssh k8s-master

Using kubectl from local workstation without SSH-ing via Vagrant

• Create dedicated config directory in local .kube directory

# Create directory in which you're going to store Kubernetes config
mkdir -p ~/.kube/kubernetes-localhost
# Copy file from Kubernetes master
scp -i ~/.vagrant.d/insecure_private_key [email protected]:~/.kube/config ~/.kube/kubernetes-localhost

Note: In case you redeploy cluster, you'll have to remove previous entry from .ssh/known_hosts or you'll get WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! warning, you can use this command for example:

sed -i "/192.168.100.100/d" ~/.ssh/known_hosts

• You can now access Kubernetes cluster without sshing into Vagrant box:

kubectl --kubeconfig=/home/$USER/.kube/kubernetes-localhost get pods --all-namespaces

Optional: Create alias in configuration file of your shell, for example:

# Open rc file
vim ~/.zshrc
# Insert alias
alias kubectl_local='kubectl --kubeconfig=/home/$USER/.kube/kubernetes-localhost'
# Save and exit Vim (can't help you there), and reload config
source ~/.zshrc
# Test
kubectl_local get pods --all-namespaces

Obtaining token for Dashboard access

• Check for secret name

kubectl get secrets -n kube-system | grep 'dashboard'
# Example:
kubectl describe secret/dashboard-access-token-mb7fw -n kube-system

• Navigate to one of above mentioned URLs and paste it in there

Delete setup:

• Run vagrant destroy -f
• Remove repository