def perform_self_unregistration(cluster=None):
"""Attempt self removal during unit teardown."""
etcdctl = EtcdCtl()
leader_address = leader_get("leader_address")
unit_name = os.getenv("JUJU_UNIT_NAME").replace("/", "")
members = etcdctl.member_list()
# Self Unregistration
etcdctl.unregister(members[unit_name]["unit_id"], leader_address)
def perform_self_unregistration(cluster=None):
''' Attempt self removal during unit teardown. '''
etcdctl = EtcdCtl()
leader_address = leader_get('leader_address')
unit_name = os.getenv('JUJU_UNIT_NAME').replace('/', '')
members = etcdctl.member_list()
# Self Unregistration
etcdctl.unregister(members[unit_name]['unit_id'], leader_address)
def unregister(cluster):
''' The leader will process the departing event and attempt unregistration
for the departing unit. If the leader is departing, it will unregister
all units prior to termination.
'''
etcdctl = EtcdCtl()
peers = cluster.get_peers()
members = etcdctl.member_list()
for unit in peers:
cluster_name = unit.replace('/', '')
if cluster_name in members.keys():
log("Unregistering {0}".format(unit))
etcdctl.unregister(members[cluster_name]['unit_id'])
else:
log("Received removal for disconnected member {}".format(unit))
cluster.dismiss()
def dismantle_cluster():
"""Disconnect other cluster members.
This is a preparation step before restoring snapshot on the cluster.
"""
log('Disconnecting cluster members')
etcdctl = EtcdCtl()
etcd_conf = EtcdDatabag()
my_name = etcd_conf.unit_name
endpoint = 'https://{}:{}'.format(etcd_conf.cluster_address,
etcd_conf.port)
for name, data in etcdctl.member_list(endpoint).items():
if name != my_name:
log('Disconnecting {}'.format(name), hookenv.DEBUG)
etcdctl.unregister(data['unit_id'], endpoint)
etcd_conf.cluster_state = 'new'
conf_path = os.path.join(etcd_conf.etcd_conf_dir, "etcd.conf.yml")
render('etcd3.conf', conf_path, etcd_conf.__dict__, owner='root',
group='root')
def register_node_with_leader(cluster):
'''
Control flow mechanism to perform self registration with the leader.
Before executing self registration, we must adhere to the nature of offline
static turnup rules. If we find a GUID in the member list without peering
information the unit will enter a race condition and must wait for a clean
status output before we can progress to self registration.
'''
etcdctl = EtcdCtl()
bag = EtcdDatabag()
leader_address = leader_get('leader_address')
bag.leader_address = leader_address
try:
# Check if we are already registered. Unregister ourselves if we are so
# we can register from scratch.
peer_url = 'https://%s:%s' % (bag.cluster_address, bag.management_port)
members = etcdctl.member_list(leader_address)
for member_name, member in members.items():
if member['peer_urls'] == peer_url:
log('Found member that matches our peer URL. Unregistering...')
etcdctl.unregister(member['unit_id'], leader_address)
# Now register.
resp = etcdctl.register(bag.__dict__)
bag.cluster = resp['cluster']
except EtcdCtl.CommandFailed:
log('etcdctl.register failed, will retry')
msg = 'Waiting to retry etcd registration'
status_set('waiting', msg)
return
render_config(bag)
host.service_restart(bag.etcd_daemon)
open_port(bag.port)
set_state('etcd.registered')
def register_node_with_leader(cluster):
"""
Control flow mechanism to perform self registration with the leader.
Before executing self registration, we must adhere to the nature of offline
static turnup rules. If we find a GUID in the member list without peering
information the unit will enter a race condition and must wait for a clean
status output before we can progress to self registration.
"""
etcdctl = EtcdCtl()
bag = EtcdDatabag()
leader_address = leader_get("leader_address")
bag.leader_address = leader_address
try:
# Check if we are already registered. Unregister ourselves if we are so
# we can register from scratch.
peer_url = "https://%s:%s" % (bag.cluster_address, bag.management_port)
members = etcdctl.member_list(leader_address)
for _, member in members.items():
if member["peer_urls"] == peer_url:
log("Found member that matches our peer URL. Unregistering...")
etcdctl.unregister(member["unit_id"], leader_address)
# Now register.
resp = etcdctl.register(bag.__dict__)
bag.set_cluster(resp["cluster"])
except EtcdCtl.CommandFailed:
log("etcdctl.register failed, will retry")
msg = "Waiting to retry etcd registration"
status.waiting(msg)
return
render_config(bag)
host.service_restart(bag.etcd_daemon)
open_port(bag.port)
set_state("etcd.registered")
def register_node_with_leader(cluster):
'''
Control flow mechanism to perform self registration with the leader.
Before executing self registration, we must adhere to the nature of offline
static turnup rules. If we find a GUID in the member list without peering
information the unit will enter a race condition and must wait for a clean
status output before we can progress to self registration.
'''
# We're going to communicate with the leader, and we need our bootstrap
# startup string once.. TBD after that.
etcdctl = EtcdCtl()
bag = EtcdDatabag()
# Assume a hiccup during registration and attempt a retry
if bag.cluster_unit_id:
bag.cluster = bag.registration_peer_string
# conf_path = '{}/etcd.conf'.format(bag.etcd_conf_dir)
render_config(bag)
time.sleep(2)
try:
peers = etcdctl.member_list(leader_get('leader_address'))
except CalledProcessError:
log("Etcd attempted to invoke registration before service ready")
# This error state is transient, and does not imply the unit is broken.
# Erroring at this stage can be resolved, and should not effect the
# overall condition of unit turn-up. Return from the method and let the
# charm re-invoke on next run
return
for unit in peers:
if 'client_urls' not in peers[unit].keys():
msg = 'Waiting for unit to complete registration.'
if ('peer_urls' in peers[unit].keys() and
peers[unit]['peer_urls'] and
get_ingress_address('cluster') in peers[unit]['peer_urls'] and # noqa
not host.service_running(bag.etcd_daemon)):
# We have a peer that is unstarted and it is this node.
# We do not run etcd now. Instead of blocking everyone
# try to self-unregister.
try:
leader_address = leader_get('leader_address')
msg = 'Etcd service did not start. Will retry soon.'
etcdctl.unregister(peers[unit]['unit_id'], leader_address)
except CalledProcessError:
log('Notice: Unit failed to unregister', 'WARNING')
# we cannot register. State not attainable.
status_set('waiting', msg)
return
if not bag.cluster_unit_id:
bag.leader_address = leader_get('leader_address')
resp = etcdctl.register(bag.__dict__)
if resp and 'cluster_unit_id' in resp.keys() and 'cluster' in resp.keys(): # noqa
bag.cache_registration_detail('cluster_unit_id',
resp['cluster_unit_id'])
bag.cache_registration_detail('registration_peer_string',
resp['cluster'])
bag.cluster_unit_id = resp['cluster_unit_id']
bag.cluster = resp['cluster']
else:
log('etcdctl.register failed, will retry')
msg = 'Waiting to retry etcd registration'
status_set('waiting', msg)
return
render_config(bag)
host.service_restart(bag.etcd_daemon)
time.sleep(2)
# Check health status before we say we are good
etcdctl = EtcdCtl()
status = etcdctl.cluster_health()
if 'unhealthy' in status:
status_set('blocked', 'Cluster not healthy.')
return
open_port(bag.port)
set_state('etcd.registered')
