if down:
log('down: find a new master!', 'info')
try:
master = r.info()['master_host']
log("master: {0}".format(master), 'info')
if cluster.exists(master):
grandmaster = cluster.get_master(master)
log("{0} = cluster.get_master({1})".format(grandmaster, master), 'info')
# and make sure the master doesn't participate anymore
cluster.incarcerate_node(master)
log("cluster.incarcerate_node({0})".format(master), 'info')
else:
grandmaster = cluster.get_master(node)
log("{0} = cluster.get_master({1})".format(grandmaster, node), 'info')
except:
log('we never were a slave', 'info')
grandmaster = None
if grandmaster == None:
r53_zone.update_record(cluster.name(), endpoint)
log("r53_zone.update_record({0}, {1})".format(cluster.name(), endpoint), 'info')
host.set_master()
log("host.set_master()", 'info')
else:
host.set_master(grandmaster)
log("host.set_master({0})".format(grandmaster), 'info')
else:
log("master is up (and running)", 'info')
def log(message, logging='info'):
events.log(node, component, message, logging)
if __name__ == '__main__':
log('joining the cluster', 'info')
log('adding the node to the cluster', 'info')
# now we are ready to be (added to) the cluster
cluster.add_node(node, endpoint)
log('creating a Route53 records', 'info')
r53_zone.create_record(node, endpoint)
log('setting the tag', 'info')
ec2.set_tag(node)
log('getting the master of the node', 'info')
master = cluster.get_master(node)
# if we don't have a master, we ARE the master
if master == None:
log('setting the main Route53 record for the cluster', 'info')
r53_zone.update_record(cluster.name(), endpoint)
# and make sure we 'run' correctly (no-slave, well-monitored)
log('set the host to run as master', 'info')
host.set_master()
else:
# attach to the master (and start watching its availability)
log('set the host to run as slave of {0}'.format(master), 'info')
host.set_master(master)
log('joined the cluster', 'info')
