Proxmox Debian VM Template Setup

proxmox-debian-ct-template-setup.sh

#!/bin/bash

set +exo pipefail

# Call with:
# wget -qO - https://gist.githubusercontent.com/mietzen/b05f050c774450247a4d1512ffaa1243/raw/proxmox-debian-ct-template-setup.sh | \
#    | bash /dev/stdin $YOUR_USER_NAME

## Install deps
apt-get update
apt-get dist-upgrade -y
apt-get install sudo curl wget python3 -y

## User Setup
CT_USER=$1

useradd -m -U -G sudo -s /usr/bin/bash ${CT_USER}
mkdir -p /home/${CT_USER}/.ssh
cp /root/.ssh/authorized_keys /home/${CT_USER}/.ssh/authorized_keys
chown -R ${CT_USER}:${CT_USER} /home/${CT_USER}/.ssh
chmod 700 /home/${CT_USER}/.ssh
chmod 600 /home/${CT_USER}/.ssh/authorized_keys
echo "${CT_USER} ALL=(ALL:ALL) NOPASSWD: ALL" | sudo tee /etc/sudoers.d/${CT_USER}

## No ssh root / password login
sed -i 's/^#PermitRootLogin.*/PermitRootLogin no/' /etc/ssh/sshd_config 
sed -i 's/^#PasswordAuthentication.*/PasswordAuthentication no/' /etc/ssh/sshd_config 

## Generate MOTD
rm -rf /etc/update-motd.d/*
cat << 'EOF' > /etc/update-motd.d/00-update-motd
#!/bin/bash

source /etc/os-release

load=$(cat /proc/loadavg | awk '{print $1}')
root_usage=$(df -h / | awk '/\// {print $(NF-1)}')
memory_usage=$(free -m | awk '/Mem:/ { total=$2 } /buffers\/cache/ { used=$3 } END { printf("%3.1f%%", used/total*100)}')
swap_usage=$(free -m | awk '/Swap/ { printf("%3.1f%%", "exit !$2;$3/$2*100") }')
users=$(users | wc -w)
time=$(uptime | grep -ohe 'up .*' | sed 's/,/\ hours/g' | awk '{ printf $2" "$3 }')
processes=$(ps aux | wc -l)
ip=$(ip addr | grep inet.*eth | sed 's/.*inet //' | sed 's/\/.*//' | head -n1)
pkgs=$(apt list --upgradable 2> /dev/null | grep 'upgradable' | wc -l)

echo $(date)
echo
echo -e "\033[1mWelcome to $(hostname) - ${ID^} ${VERSION_ID} $(uname -r)\033[0m"
echo
echo -e "System load:\t${load}\tIP Address:\t${ip}"
echo -e "Memory usage:\t${memory_usage}\tSystem uptime:\t${time}"
echo -e "Usage on /:\t${root_usage}\tSwap usage:\t${swap_usage}"
echo
if [ ${pkgs} -gt 0 ]; then
    echo -e "\033[1;31mSystem needs ${pkgs} updates!\033[0m"
else
    echo -e "\033[1;32mSystem is up to date!\033[0m"
fi
EOF

chmod +x /etc/update-motd.d/00-update-motd

echo "" > /etc/motd

## Generate Issue message

cat << EOF > /etc/issue
Debian GNU/Linux 12 \n \l

IP (eth0): \4{eth0}

EOF

## Cleanup
apt-get autoremove -y
apt-get autoclean -y
history -c