Download and install caddy on a linux box

get_caddy.sh

TARBALL=caddy.tar.gz
TARGET=/opt/caddy

echo "downloading caddy"
wget -O $TARBALL "https://caddyserver.com/download/linux/amd64?plugins=http.cors,http.expires,http.filter,http.ipfilter,http.minify,http.ratelimit"

echo "creating target directory"
sudo mkdir -p $TARGET

echo "extracting caddy"
sudo tar -xvzf $TARBALL -C $TARGET

echo "allow non privileged users to run caddy and bind to privileged ports"
sudo setcap "cap_net_bind_service=+ep" $TARGET/caddy

echo "removing tarball"
rm $TARBALL

echo "adding caddy user"
sudo adduser --disabled-password --disabled-login --no-create-home caddy

echo "adding caddy configuration directory (/var/caddy)
sudo mkdir /var/caddy
sudo chown caddy /var/caddy
sudo chmod 0700 /var/caddy

echo "creating systemd unit file"
sudo tee /etc/systemd/system/caddy.service <<EOF
[Unit]
Description=Caddy HTTP/2 web server
Documentation=https://caddyserver.com/docs
After=network.target

[Service]
User=caddy
LimitNOFILE=8192
Environment=STNORESTART=yes
ExecStart=/opt/caddy/caddy -agree=true -conf=/var/caddy/Caddyfile
Restart=on-failure

[Install]
WantedBy=multi-user.target
EOF