def promote():
assert is_secondary(), 'Cannot promote primary'
assert is_running(), 'Attempting to promote a stopped server'
wal_e_enabled = reactive.is_state('postgresql.wal_e.enabled')
if wal_e_enabled or has_version('9.3'):
# If we have PostgreSQL 9.3 or WAL archiving enabled, promote
# and do a timeline switch. We have to assume WAL-E is configured
# properly and is working.
rc = subprocess.call(['sudo', '-u', 'postgres', '-H',
pg_ctl_path(), 'promote', '-D', data_dir()],
universal_newlines=True)
if rc != 0:
helpers.status_set('blocked', 'Failed to promote to primary')
raise SystemExit(0)
else:
# Removing recovery.conf will promote the unit to master without
# a timeline switch when PostgreSQL is restarted.
os.unlink(recovery_conf_path())
# Restart now. No need to request permission, as this unit was
# previously a secondary and not being used by anything. This
# also ensures the unit is a functioning primary before returning,
# like the newer 'promote' code path above.
stop()
start()
def promote():
assert is_secondary(), "Cannot promote primary"
assert is_running(), "Attempting to promote a stopped server"
rc = subprocess.call(
["sudo", "-u", "postgres", "-H", pg_ctl_path(), "promote", "-D", data_dir()],
universal_newlines=True,
)
if rc != 0:
helpers.status_set("blocked", "Failed to promote to primary")
raise SystemExit(0)
def handle_storage_relation(dead_chicken):
# Remove this once Juju storage is no longer experiemental and
# everyone has had a chance to upgrade.
data_rels = context.Relations()['data']
if len(data_rels) > 1:
helpers.status_set('blocked',
'Too many relations to the storage subordinate')
return
elif data_rels:
relid, rel = list(data_rels.items())[0]
rel.local['mountpoint'] = external_volume_mount
if needs_remount():
reactive.set_state('postgresql.storage.needs_remount')
apt.queue_install(['rsync'])
# Migrate any data when we can restart.
coordinator.acquire('restart')
def handle_storage_relation(dead_chicken):
# Remove this once Juju storage is no longer experiemental and
# everyone has had a chance to upgrade.
data_rels = context.Relations()["data"]
if len(data_rels) > 1:
helpers.status_set("blocked",
"Too many relations to the storage subordinate")
return
elif data_rels:
relid, rel = list(data_rels.items())[0]
rel.local["mountpoint"] = external_volume_mount
if needs_remount():
reactive.set_state("postgresql.storage.needs_remount")
apt.queue_install(["rsync"])
# Migrate any data when we can restart.
coordinator.acquire("restart")
