def config_changed():
# It is critical that the installation is attempted first before any
# rendering of the configuration files occurs.
# install_percona_xtradb_cluster has the code to decide if this is the
# leader or if the leader is bootstrapped and therefore ready for install.
install_percona_xtradb_cluster()
# if we are paused, delay doing any config changed hooks. It is forced on
# the resume.
if is_unit_paused_set():
return
if config('prefer-ipv6'):
assert_charm_supports_ipv6()
hosts = get_cluster_hosts()
leader_bootstrapped = is_leader_bootstrapped()
leader_ip = leader_get('leader-ip')
if is_leader():
# If the cluster has not been fully bootstrapped once yet, use an empty
# hosts list to avoid restarting the leader node's mysqld during
# cluster buildup.
# After, the cluster has bootstrapped at least one time, it is much
# less likely to have restart collisions. It is then safe to use the
# full hosts list and have the leader node's mysqld restart.
if not clustered_once():
hosts = []
log("Leader unit - bootstrap required=%s" % (not leader_bootstrapped),
DEBUG)
render_config_restart_on_changed(hosts,
bootstrap=not leader_bootstrapped)
elif leader_bootstrapped and is_sufficient_peers():
# Speed up cluster process by bootstrapping when the leader has
# bootstrapped if we have expected number of peers
if leader_ip not in hosts:
# Fix Bug #1738896
hosts = [leader_ip] + hosts
log("Leader is bootstrapped - configuring mysql on this node", DEBUG)
# Rendering the mysqld.cnf and restarting is bootstrapping for a
# non-leader node.
render_config_restart_on_changed(hosts)
# Assert we are bootstrapped. This will throw an
# InconsistentUUIDError exception if UUIDs do not match.
update_bootstrap_uuid()
else:
# Until the bootstrap-uuid attribute is set by the leader,
# cluster_ready() will evaluate to False. So it is necessary to
# feed this information to the user.
status_set('waiting', "Waiting for bootstrap-uuid set by leader")
log('Non-leader waiting on leader bootstrap, skipping render', DEBUG)
return
# Notify any changes to the access network
update_client_db_relations()
# (re)install pcmkr agent
install_mysql_ocf()
for rid in relation_ids('ha'):
# make sure all the HA resources are (re)created
ha_relation_joined(relation_id=rid)
if is_relation_made('nrpe-external-master'):
update_nrpe_config()
open_port(DEFAULT_MYSQL_PORT)
# the password needs to be updated only if the node was already
# bootstrapped
if is_bootstrapped():
update_root_password()
set_ready_on_peers()
def config_changed():
# if we are paused or upgrading, delay doing any config changed hooks.
# It is forced on the resume.
if is_unit_paused_set() or is_unit_upgrading_set():
log("Unit is paused or upgrading. Skipping config_changed", "WARN")
return
# It is critical that the installation is attempted first before any
# rendering of the configuration files occurs.
# install_percona_xtradb_cluster has the code to decide if this is the
# leader or if the leader is bootstrapped and therefore ready for install.
install_percona_xtradb_cluster()
if config('prefer-ipv6'):
assert_charm_supports_ipv6()
hosts = get_cluster_hosts()
leader_bootstrapped = is_leader_bootstrapped()
leader_ip = leader_get('leader-ip')
# Cluster upgrade adds some complication
cluster_series_upgrading = leader_get("cluster_series_upgrading")
if cluster_series_upgrading:
leader = (leader_get('cluster_series_upgrade_leader') ==
get_relation_ip('cluster'))
leader_ip = leader_get('cluster_series_upgrade_leader')
else:
leader = is_leader()
leader_ip = leader_get('leader-ip')
if leader:
# If the cluster has not been fully bootstrapped once yet, use an empty
# hosts list to avoid restarting the leader node's mysqld during
# cluster buildup.
# After, the cluster has bootstrapped at least one time, it is much
# less likely to have restart collisions. It is then safe to use the
# full hosts list and have the leader node's mysqld restart.
# Empty hosts if cluster_series_upgrading
if not clustered_once() or cluster_series_upgrading:
hosts = []
log("Leader unit - bootstrap required=%s" % (not leader_bootstrapped),
DEBUG)
render_config_restart_on_changed(hosts,
bootstrap=not leader_bootstrapped)
elif (leader_bootstrapped and
is_sufficient_peers() and not
cluster_series_upgrading):
# Skip if cluster_series_upgrading
# Speed up cluster process by bootstrapping when the leader has
# bootstrapped if we have expected number of peers
if leader_ip not in hosts:
# Fix Bug #1738896
hosts = [leader_ip] + hosts
log("Leader is bootstrapped - configuring mysql on this node",
DEBUG)
# Rendering the mysqld.cnf and restarting is bootstrapping for a
# non-leader node.
render_config_restart_on_changed(hosts)
# Assert we are bootstrapped. This will throw an
# InconsistentUUIDError exception if UUIDs do not match.
update_bootstrap_uuid()
else:
# Until the bootstrap-uuid attribute is set by the leader,
# cluster_ready() will evaluate to False. So it is necessary to
# feed this information to the user.
status_set('waiting', "Waiting for bootstrap-uuid set by leader")
log('Non-leader waiting on leader bootstrap, skipping render',
DEBUG)
return
# Notify any changes to the access network
update_client_db_relations()
# (re)install pcmkr agent
install_mysql_ocf()
for rid in relation_ids('ha'):
# make sure all the HA resources are (re)created
ha_relation_joined(relation_id=rid)
if is_relation_made('nrpe-external-master'):
update_nrpe_config()
open_port(DEFAULT_MYSQL_PORT)
# the password needs to be updated only if the node was already
# bootstrapped
if is_bootstrapped():
update_root_password()
set_ready_on_peers()
# NOTE(tkurek): re-set 'master' relation data
if relation_ids('master'):
master_joined()