def bootstrap_pxc(args):
""" Force a bootstrap on this node
This action will run bootstrap-pxc on this node bootstrapping the cluster.
This action should only be run after a cold start requiring a bootstrap.
This action should only be run on the node with the highest sequence number
as displayed in workgoup status and found in grastate.dat.
If this unit has the highest sequence number and is not the juju leader
node, a subsequent action run of notify-bootstrapped is required.
"""
try:
# Force safe to bootstrap
percona_utils.set_grastate_safe_to_bootstrap()
# Boostrap this node
percona_utils.bootstrap_pxc()
percona_utils.notify_bootstrapped()
except (percona_utils.GRAStateFileNotFound, OSError) as e:
action_set({'output': e.output, 'return-code': e.returncode})
action_fail("The GRAState file does not exist or cannot "
"be written to.")
except (subprocess.CalledProcessError, Exception) as e:
action_set({
'output': e.output,
'return-code': e.returncode,
'traceback': traceback.format_exc()
})
action_fail("The bootstrap-pxc failed. "
"See traceback in show-action-output")
action_set({
'output':
"Bootstrap succeeded. "
"Wait for the other units to run update-status"
})
percona_utils.assess_status(percona_utils.register_configs())
def render_config_restart_on_changed(hosts, bootstrap=False):
"""Render mysql config and restart mysql service if file changes as a
result.
If bootstrap is True we do a bootstrap-pxc in order to bootstrap the
percona cluster. This should only be performed once at cluster creation
time.
If percona is already bootstrapped we can get away with just ensuring that
it is started so long as the new node to be added is guaranteed to have
been restarted so as to apply the new config.
"""
config_file = resolve_cnf_file()
pre_hash = file_hash(config_file)
render_config(hosts)
create_binlogs_directory()
update_db_rels = False
if file_hash(config_file) != pre_hash or bootstrap:
if bootstrap:
bootstrap_pxc()
# NOTE(dosaboy): this will not actually do anything if no cluster
# relation id exists yet.
notify_bootstrapped()
update_db_rels = True
else:
# NOTE(jamespage):
# if mysql@bootstrap is running, then the native
# bootstrap systemd service was used to start this
# instance, and it was the initial seed unit
# stop the bootstap version before restarting normal mysqld
if service_running('mysql@bootstrap'):
service_stop('mysql@bootstrap')
attempts = 0
max_retries = 5
cluster_wait()
while not service_restart('mysql'):
if attempts == max_retries:
raise Exception("Failed to start mysql (max retries "
"reached)")
log("Failed to start mysql - retrying per distributed wait",
WARNING)
attempts += 1
cluster_wait()
# If we get here we assume prior actions have succeeded to always
# this unit is marked as seeded so that subsequent calls don't result
# in a restart.
mark_seeded()
if update_db_rels:
update_client_db_relations()
else:
log("Config file '{}' unchanged".format(config_file), level=DEBUG)
def render_config_restart_on_changed(clustered, hosts, bootstrap=False):
"""Render mysql config and restart mysql service if file changes as a
result.
If bootstrap is True we do a bootstrap-pxc in order to bootstrap the
percona cluster. This should only be performed once at cluster creation
time.
If percona is already bootstrapped we can get away with just ensuring that
it is started so long as the new node to be added is guaranteed to have
been restarted so as to apply the new config.
"""
config_file = resolve_cnf_file()
pre_hash = file_hash(config_file)
render_config(clustered, hosts)
create_binlogs_directory()
update_db_rels = False
if file_hash(config_file) != pre_hash or bootstrap:
if bootstrap:
bootstrap_pxc()
# NOTE(dosaboy): this will not actually do anything if no cluster
# relation id exists yet.
notify_bootstrapped()
update_db_rels = True
else:
delay = 1
attempts = 0
max_retries = 5
# NOTE(dosaboy): avoid unnecessary restarts. Once mysql is started
# it needn't be restarted when new units join the cluster since the
# new units will join and apply their own config.
if not seeded():
action = service_restart
else:
action = service_start
while not action('mysql'):
if attempts == max_retries:
raise Exception("Failed to start mysql (max retries "
"reached)")
log("Failed to start mysql - retrying in %ss" % (delay),
WARNING)
time.sleep(delay)
delay += 2
attempts += 1
# If we get here we assume prior actions have succeeded to always
# this unit is marked as seeded so that subsequent calls don't result
# in a restart.
mark_seeded()
if update_db_rels:
update_shared_db_rels()
else:
log("Config file '{}' unchanged".format(config_file), level=DEBUG)
def render_config_restart_on_changed(hosts, bootstrap=False):
"""Render mysql config and restart mysql service if file changes as a
result.
If bootstrap is True we do a bootstrap-pxc in order to bootstrap the
percona cluster. This should only be performed once at cluster creation
time.
If percona is already bootstrapped we can get away with just ensuring that
it is started so long as the new node to be added is guaranteed to have
been restarted so as to apply the new config.
"""
config_file = resolve_cnf_file()
pre_hash = file_hash(config_file)
render_config(hosts)
create_binlogs_directory()
update_db_rels = False
if file_hash(config_file) != pre_hash or bootstrap:
if bootstrap:
bootstrap_pxc()
# NOTE(dosaboy): this will not actually do anything if no cluster
# relation id exists yet.
notify_bootstrapped()
update_db_rels = True
else:
# NOTE(jamespage):
# if mysql@bootstrap is running, then the native
# bootstrap systemd service was used to start this
# instance, and it was the initial seed unit
# stop the bootstap version before restarting normal mysqld
if service_running('mysql@bootstrap'):
service_stop('mysql@bootstrap')
attempts = 0
max_retries = 5
cluster_wait()
while not service_restart('mysql'):
if attempts == max_retries:
raise Exception("Failed to start mysql (max retries "
"reached)")
log("Failed to start mysql - retrying per distributed wait",
WARNING)
attempts += 1
cluster_wait()
# If we get here we assume prior actions have succeeded to always
# this unit is marked as seeded so that subsequent calls don't result
# in a restart.
mark_seeded()
if update_db_rels:
update_client_db_relations()
else:
log("Config file '{}' unchanged".format(config_file), level=DEBUG)