3.1 Install Kubernetes

Good afternoon.

I have a quick question regarding the instructions for installing Kubernetes.

I downloaded and unzipped the course tarball and I think I confused myself when looking at some of the files.

For example, the file ../SOLUTIONS/s_03/containerd-setup.txt

It has similar, yet differing commands to be run to install containerd.
Such as downloading the Keys and installing containerd, but using different filenames.
( /etc/sysctl.d/kubernetes.conf vs. /etc/sysctl.d/99-kubernetes-cri.conf)

Should I just ignore this, and follow the instructions from the 3.1 Lab?
I'm pretty sure they're doing the same thing but I don't want to assume that out of ignorance.

• NOTE: I'm just using minikube but I was going to install on an AWS EC2 for practice

Section from ../SOLUTIONS/s_03/containerd-setup.txt:

cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
overlay
br_netfilter
EOF


# Disable swap if not on a cloud instance - done anyway

sudo swapoff -a


# Load the modules now

sudo modprobe overlay

sudo modprobe br_netfilter


# Update sysctl to load iptables and ipforwarding

cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
net.bridge.bridge-nf-call-iptables  = 1
net.ipv4.ip_forward                 = 1
net.bridge.bridge-nf-call-ip6tables = 1
EOF

sudo sysctl --system


# Install some necessary software  

sudo apt-get update && sudo apt-get install -y apt-transport-https ca-certificates curl software-properties-common

# Install the Docker keyring
#  In Ubuntu 20.04, containerd part of local repos. 

sudo apt install containerd -y

#Older OS steps
#curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key --keyring /etc/apt/trusted.gpg.d/docker.gpg add -

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

# Install and configure the containerd package
#sudo apt-get update && sudo apt-get install -y containerd.io
#sudo mkdir -p /etc/containerd
#sudo containerd config default | sudo tee /etc/containerd/config.toml

# Verify the file has the appropriate contents
#cat /etc/containerd/config.toml

Section from 3.1 Lab:

# 10.  Update kernel networking
cat << EOF | tee /etc/sysctl.d/kubernetes.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF

# 11. Changes to be used by current kernel
sysctl --system

# 12.  Install the necessary key for the software to install
sudo mkdir -p /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg \
    | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

echo \
    "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] \
    https://download.docker.com/linux/ubuntu \
    $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

# 13. Install the containerd software
apt-get update &&  apt-get install containerd.io -y
containerd config default | tee /etc/containerd/config.toml
sed -e's/SystemdCgroup = false/SystemdCgroup = true/g'-i /etc/containerd/config.toml
systemctl restart containerd