configure.sh

#!/bin/bash
#
# Cluster init configuration script
#

#
# wait for cloud-init completion on the bastion host
#
execution=1

ssh_options="-i ~/.ssh/cluster.key -o StrictHostKeyChecking=no"
sudo cloud-init status --wait
#
# Install ansible and other required packages
#
source /etc/os-release

if [ $ID == "ol" ] ; then
  repo="ol7_developer_EPEL"
else
  repo="epel"
fi


# Install ansible and other required packages

sudo yum makecache --enablerepo=$repo
sudo yum install --enablerepo=$repo -y ansible python-netaddr

#
# A little waiter function to make sure all the nodes are up before we start configure 
#

echo "Waiting for SSH to come up" 

for host in $(cat /tmp/hosts) ; do
  r=0 
  echo "validating connection to: ${host}"
  while ! ssh ${ssh_options} opc@${host} uptime ; do

	if [[ $r -eq 10 ]] ; then 
		  execution=0
		  continue
	fi 
        
	echo "Still waiting for ${host}"

	sleep 60 
	r=$(($r + 1))
  done
done

#
# Ansible will take care of key exchange and learning the host fingerprints, but for the first time we need
# to disable host key checking. 

sed -i 's/^forks.*/forks = 128/' /etc/ansible/ansible.cfg

#
if [[ $execution -eq 1 ]] ; then
  ANSIBLE_HOST_KEY_CHECKING=False ansible-playbook -vv /home/opc/playbooks/site.yml -i /home/opc/playbooks/inventory
else

	cat <<- EOF > /etc/motd
	At least one of the cluster nodes has been innacessible during installation. Please validate the hosts and re-run: 
	ANSIBLE_HOST_KEY_CHECKING=False ansible-playbook /home/opc/playbooks/site.yml -i /home/opc/playbooks/inventory
EOF

fi