go caddy server install on Centos 6 and init.d config

# step 1, install caddyserver
curl -s https://getcaddy.com | bash
groupadd -g 33 www-data
useradd \
  -g www-data --no-user-group \
  --home-dir /var/www --no-create-home \
  --shell /usr/sbin/nologin \
  --system --uid 33 www-data

mkdir /etc/caddy
chown -R root:www-data /etc/caddy
mkdir /etc/ssl/caddy
chown -R www-data:root /etc/ssl/caddy
chmod 0770 /etc/ssl/caddy

# step 2, download sysvinit file
wget https://raw.githubusercontent.com/mholt/caddy/master/dist/init/linux-sysvinit/caddy -O /etc/init.d/caddy

# step 3, install daemon
cd /usr/local/src
wget http://developer.axis.com/download/distribution/apps-sys-utils-start-stop-daemon-IR1_9_18-2.tar.gz
tar zxvf apps-sys-utils-start-stop-daemon-IR1_9_18-2.tar.gz
cd apps/sys-utils/start-stop-daemon-IR1_9_18-2
gcc start-stop-daemon.c -o start-stop-daemon
cp start-stop-daemon /usr/sbin/

# step 4, start service
service caddy start