Installing the Kubernetes Cluster - From CKA Course - Linux Academy

install-docker-kube.sh

# Get the Docker gpg key
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

# Add the Docker repository
sudo add-apt-repository    "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"

# Get the Kubernetes gpg key
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -

# Add the Kubernetes repository
cat << EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb https://apt.kubernetes.io/ kubernetes-xenial main
EOF

# Update your packages
sudo apt-get update

# Install Docker, kubelet, kubeadm, and kubectl
sudo apt-get install -y docker-ce=5:19.03.12~3-0~ubuntu-bionic kubelet=1.17.8-00 kubeadm=1.17.8-00 kubectl=1.17.8-00

# Hold them at the current version
sudo apt-mark hold docker-ce kubelet kubeadm kubectl

# Add the iptables rule to sysctl.conf
echo "net.bridge.bridge-nf-call-iptables=1" | sudo tee -a /etc/sysctl.conf

# Enable iptables immediately
sudo sysctl -p

Suggested revision:

L21
sudo apt-get install -y docker-ce=5:19.03.123-0ubuntu-focal kubelet=1.17.8-00 kubeadm=1.17.8-00 kubectl=1.17.8-00

as of 07/28/20 only this version was available
sudo apt-get install -y docker-ce=5:19.03.9~3-0~ubuntu-focal kubelet=1.17.8-00 kubeadm=1.17.8-00 kubectl=1.17.8-00

for the acloud.guru provided lab servers I needed to run:
sudo modprobe br_netfilter
to be able to add iptables rules

@KajKandler I also noticed that only docker-ce=5:19.03.9~3-0~ubuntu-focal was available on the lab servers. This appears to be due to the servers being upgraded to Ubuntu 20.04 (Focal Fossa).

I would suggest using

sudo apt-get install -y docker-ce=18.06.0~ce~3-0~ubuntu kubelet=1.18.5-00 kubeadm=1.18.5-00 kubectl=1.18.5-00

when I try to install both versions for the deleted node and recreated new node

root@4748e5513c3c:# sudo apt install -y docker-ce=5:19.03.103-0ubuntu-focal kubelet=1.18.5-00 kubeadm=1.18.5-00 kubectl=1.18.5-00
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Version '5:19.03.103-0ubuntu-focal' for 'docker-ce' was not found
root@4748e5513c3c:# ^Cubelet=1.18.5-00 kubeadm=1.18.5-00 kubectl=1.18.5-00
root@4748e5513c3c:# sudo apt-get install -y docker-ce=18.06.0ce3-0ubuntu kubelet=1.18.5-00 kubeadm=1.18.5-00 kubectl=1.18.5-00
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Version '18.06.0ce3-0ubuntu' for 'docker-ce' was not found
root@4748e5513c3c:#