From 06c1c4f342be841f81ab70c78a8670fadee4efd3 Mon Sep 17 00:00:00 2001
From: nsalfos <107048281+nsalfos@users.noreply.github.com>
Date: Thu, 26 Jan 2023 16:56:53 +0000
Subject: [PATCH] modified script to use contianerd instead of docker and
 install weave network CNI

---
 setup-containerd.sh | 127 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100755 setup-containerd.sh

diff --git a/setup-containerd.sh b/setup-containerd.sh
new file mode 100755
index 0000000..72c0203
--- /dev/null
+++ b/setup-containerd.sh
@@ -0,0 +1,127 @@
+#!/bin/bash
+# script that runs 
+# https://kubernetes.io/docs/setup/production-environment/container-runtime
+
+# setting MYOS variable
+MYOS=$(hostnamectl | awk '/Operating/ { print $3 }')
+OSVERSION=$(hostnamectl | awk '/Operating/ { print $4 }')
+
+echo printing MYOS $MYOS
+
+##### CentOS 7 config
+if [ $MYOS = "CentOS" ]
+then
+	if [ "$EUID" -ne 0 ]
+  then echo "Please run as root"
+  exit
+	fi
+	echo setting up CentOS 7 with containerd 
+	# Configure prerequisites
+	modprobe overlay
+	modprobe br_netfilter
+
+	cat <<EOF | tee /etc/modules-load.d/containerd.conf
+overlay
+br_netfilter
+EOF
+
+	cat <<EOF | 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
+
+	sysctl –system
+	
+	# Install containerd
+	yum install -y dnf dnf-plugins-core
+	dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
+	dnf update -y
+	dnf install -y containerd
+
+	mkdir -p /etc/containerd
+	containerd config default | tee /etc/containerd/config.toml
+	# Set cgroupdriver to systemd
+	sed -i 's/SystemdCgroup = false/SystemdCgroup = true/' /etc/containerd/config.toml
+	systemctl restart containerd
+
+	# Install weave CNI. & Make the Weave Net package executable:
+	curl -L git.io/weave -o /usr/local/bin/weave
+	chmod a+x /usr/local/bin/weave
+
+	# Create a systemd service for Weave Net  /etc/systemd/system/weave.service 
+  cat <<- WEAVE | tee /etc/systemd/system/weave.service
+	[Unit]
+	Description=Weave Net
+
+	[Service]
+	ExecStart=/usr/local/bin/weave launch
+
+	[Install]
+	WantedBy=multi-user.target
+  
+	WEAVE
+
+	systemctl daemon-reload
+	systemctl start weave
+	systemctl enable weave
+
+fi
+
+
+if [ $MYOS = "Ubuntu" ]
+then
+        ### setting up container runtime prereq
+        cat <<- EOF | sudo tee /etc/modules-load.d/containerd.conf
+        overlay
+        br_netfilter
+        
+				EOF
+
+        sudo modprobe overlay
+        sudo modprobe br_netfilter
+
+        # Setup required sysctl params, these persist across reboots.
+        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
+
+        # Apply sysctl params without reboot
+        sudo sysctl --system
+
+        # (Install containerd)
+
+        sudo apt-get update && sudo apt-get install -y containerd
+        # hopefully temporary bugfix as the containerd version provided in Ubu repo is tool old
+        # added Jan 26th 2023
+        # this needs to be updated when a recent enough containerd version will be in Ubuntu repos
+        sudo systemctl stop containerd
+        # cleanup old files from previous attempt if existing
+        [ -d bin ] && rm -rf bin
+        wget https://github.com/containerd/containerd/releases/download/v1.6.15/containerd-1.6.15-linux-amd64.tar.gz 
+        tar xvf containerd-1.6.15-linux-amd64.tar.gz
+        sudo mv bin/* /usr/bin/
+
+				# Configure containerd
+        sudo mkdir -p /etc/containerd
+        cat <<- TOML | sudo tee /etc/containerd/config.toml
+				version = 2
+				[plugins]
+  			[plugins."io.containerd.grpc.v1.cri"]
+    		[plugins."io.containerd.grpc.v1.cri".containerd]
+      	discard_unpacked_layers = true
+      	[plugins."io.containerd.grpc.v1.cri".containerd.runtimes]
+        [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
+      	runtime_type = "io.containerd.runc.v2"
+        [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
+        SystemdCgroup = true
+        
+				TOML
+
+        # Restart containerd
+        sudo systemctl restart containerd
+fi
+