Kubernetes Docker cluster manager

Azure/Kubernetes
Notes: https://gitlab.com/snippets/1813194
Interacting with running pods - https://kubernetes.io/docs/reference/kubectl/cheatsheet/#interacting-with-running-pods

201903 minikube

Install using curl
open host fw for port 8443 admint to vm
sudo minikube start --vm-driver=kvm2
helm

201810 microk8s snap https://github.com/ubuntu/microk8s

ubuntu laptop -

sudo snap install microk8s --classic
microk8s.kubectl get all --all-namespaces
microk8s.kubectl get no
microk8s.enable dns dashboard
watch microk8s.kubectl get all --all

sudo snap alias microk8s.kubectl kubectl

201804

minikube

Install minikube

curl -Lo minikube https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64 && chmod +x minikube && sudo mv minikube /usr/local/bin/

for kvm add kvm2 driver https://github.com/kubernetes/minikube/blob/master/docs/drivers.md#kvm2-driver

curl -LO https://storage.googleapis.com/minikube/releases/latest/docker-machine-driver-kvm2 && chmod +x docker-machine-driver-kvm2 && sudo mv docker-machine-driver-kvm2 /usr/local/bin/

kubectl to manage things.

curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/v1.10.0/bin/linux/amd64/kubectl && chmod +x kubectl && sudo mv kubectl /usr/local/bin/

ensure current user belongs to libvirtd and kvm installed sudo apt install libvirt-bin qemu-kvm

ensure default kvm network up

virsh net-autostart default
virsh net-start default

start
```
minikube start --vm-driver=kvm2 
```
verify that minikube is running
```
virsh list
```
Test with examples from https://kubernetes.io/docs/getting-started-guides/minikube/#installation

201704

Add google apt-key

curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -

Add to apt sources.list

cat <<EOF > /etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF

echo "deb http://apt.kubernetes.io/ kubernetes-trusty main" >> /etc/apt/sources.list.d/kubernetes.list

install packages

sudo apt-get install -y docker.io kubelet kubeadm kubectl kubernetes-cni
sudo systemctl enable docker.service

Got a error for docker certificate, had to delete it to get the docker deamon to start
- error
  - ```
  level=fatal msg="Error creating cluster component ...Bla...Bla...Bla... certificate expired.
```
- fix rm /var/lib/docker/swarm/certificates/swarm-node.*
setup kubernetes (k8s) master node
- ```
sudo kubeadm init
```
- error in pre-flight checks
```
DOCKER_GRAPH_DRIVER: btrfs
```
- fix, edit the /etc/docker/deamon.conf and add devicemapper option, remember "," after options.
  - ```
  "storage-driver": "devicemapper",
```

Success for kubeadm init

Your Kubernetes master has initialized successfully!

To start using your cluster, you need to run (as a regular user):

  sudo cp /etc/kubernetes/admin.conf $HOME/
  sudo chown $(id -u):$(id -g) $HOME/admin.conf
  export KUBECONFIG=$HOME/admin.conf

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  http://kubernetes.io/docs/admin/addons/

You can now join any number of machines by running the following on each node
as root:

  kubeadm join --token 030871.9354eb2226c8b23b 10.0.2.15:6443

Ubuntu 14.04 trusy - does not have a full set of kubernetes packages

Install from source
1. sudo apt install git -y
2. git clone https://github.com/kubernetes/kubernetes.git
3. cd kubernetes
4. ./build/run.sh make cross

...