All about Debian JP Admin
rsync mirror

push mirror chain
mirror site (1)
create ssh key pair
identity	- secret
identity.pub	- public
kick mirror(2) by signal.sh
ssh -o"BatchMode yes" -o"user $2" "$1" -i $HOME/.ssh/identity sleep 1
rsync daemon setup
/etc/rsyncd.conf
mirror site (2)
mirror(1)'s identity.pub put in ~/.ssh/authorized_keys