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
#
sudo yum makecache
sudo yum install -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
		  break
	fi 
    	  
	  echo "Still waiting for ${host}"
          sleep 60 
	  r=$(($r + 1))

  done
done

# Update the forks to a 8 * threads

threads=$(nproc)
forks=$(($threads * 8))

sudo sed -i "s/^#forks.*/forks = ${forks}/" /etc/ansible/ansible.cfg
sudo sed -i "s/^#fact_caching=.*/fact_caching=jsonfile/" /etc/ansible/ansible.cfg
sudo sed -i "s/^#fact_caching_connection.*/fact_caching_connection=\/tmp\/ansible/" /etc/ansible/ansible.cfg
sudo mv /home/opc/playbooks/inventory /etc/ansible/hosts
#
# Ansible will take care of key exchange and learning the host fingerprints, but for the first time we need
# to disable host key checking. 
#

if [[ $execution -eq 1 ]] ; then
  ANSIBLE_HOST_KEY_CHECKING=False ansible all -m setup --tree /tmp/ansible 
  ANSIBLE_HOST_KEY_CHECKING=False ansible-playbook /home/opc/playbooks/site.yml
else

	cat <<- EOF > /tmp/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 
EOF

sudo mv /tmp/motd /etc/motd

fi