I have this problems too. But if you run ./stack.sh after each restarting you don not have any problems and openstack work fine.

After every reboot you need to run ./stack.sh.

./rejoin-stack.sh just reconnects to the active screen. This is useful if you want to reconnect to the screen after closing the terminal.

# if screenrc exists, run screen
if [[ -e $TOP_DIR/stack-screenrc ]]; then
    if screen -ls | egrep -q "[0-9].stack"; then
        echo "Attaching to already started screen session.."
        exec screen -r stack
    fi
    exec screen -c $TOP_DIR/stack-screenrc
fi

Since devstack's main use case is not running a cloud, it will fail after a reboot. Instead of re-running ./stack.sh and after the disappearance of ./rejoin-stack.sh, the method I found useful, and it is working for me so far, is to create snapshots of the virtual machine's state, whenerver I want to save something I might be using later.

Easiest Solution is...

yum install openstack-utils dnsmasq-utils -y

openstack-service restart

openstack-status -l