Public bug reported:
This is using the MAAS 1.8 experimental branch.
A race condition is possible in which a persistent exception is thrown
when hitting http://<server>/MAAS, if maas-regiond starts before
postgresql. (that is, even if you start postgresql, the MAAS web
interface never recovers.)
==> Exception seen on the web page <==
MAAS failed to start
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 783, in __bootstrap
self.__bootstrap_inner()
File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 763, in run
self.__target(*self.__args, **self.__kwargs)
--- <exception caught here> ---
File "/usr/lib/python2.7/dist-packages/twisted/python/threadpool.py", line
191, in _worker
result = context.call(ctx, function, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/twisted/python/context.py", line 118,
in callWithContext
return self.currentContext().callWithContext(ctx, func, *args, **kw)
File "/usr/lib/python2.7/dist-packages/twisted/python/context.py", line 81,
in callWithContext
return func(*args,**kw)
File "/usr/lib/python2.7/dist-packages/maasserver/webapp.py", line 83, in
prepareApplication
start_up.start_up()
File "/usr/lib/python2.7/dist-packages/maasserver/start_up.py", line 48, in
start_up
security.get_shared_secret()
File "/usr/lib/python2.7/dist-packages/provisioningserver/utils/twisted.py",
line 113, in wrapper
return func_in_reactor(*args, **kwargs).wait(timeout)
File "/usr/lib/python2.7/dist-packages/crochet/_eventloop.py", line 219, in
wait
result.raiseException()
File "/usr/lib/python2.7/dist-packages/twisted/python/threadpool.py", line
191, in _worker
result = context.call(ctx, function, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/twisted/python/context.py", line 118,
in callWithContext
return self.currentContext().callWithContext(ctx, func, *args, **kw)
File "/usr/lib/python2.7/dist-packages/twisted/python/context.py", line 81,
in callWithContext
return func(*args,**kw)
File "/usr/lib/python2.7/dist-packages/provisioningserver/utils/twisted.py",
line 148, in wrapper
return func(*args, **kwargs)
File "/usr/lib/python2.7/dist-packages/maasserver/utils/async.py", line 164,
in call_within_transaction
return func_outside_txn(*args, **kwargs)
File "/usr/lib/python2.7/dist-packages/maasserver/utils/orm.py", line 216, in
retrier
return func(*args, **kwargs)
File "/usr/lib/python2.7/dist-packages/django/db/transaction.py", line 338,
in inner
with self:
File "/usr/lib/python2.7/dist-packages/django/db/transaction.py", line 237,
in __enter__
if not connection.get_autocommit():
File "/usr/lib/python2.7/dist-packages/django/db/backends/__init__.py", line
324, in get_autocommit
self.ensure_connection()
File "/usr/lib/python2.7/dist-packages/django/db/backends/__init__.py", line
124, in ensure_connection
self.connect()
File "/usr/lib/python2.7/dist-packages/django/db/utils.py", line 99, in
__exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/usr/lib/python2.7/dist-packages/django/db/backends/__init__.py", line
124, in ensure_connection
self.connect()
File "/usr/lib/python2.7/dist-packages/django/db/backends/__init__.py", line
112, in connect
self.connection = self.get_new_connection(conn_params)
File
"/usr/lib/python2.7/dist-packages/django/db/backends/postgresql_psycopg2/base.py",
line 116, in get_new_connection
return Database.connect(**conn_params)
File "/usr/lib/python2.7/dist-packages/psycopg2/__init__.py", line 179, in
connect
connection_factory=connection_factory, async=async)
django.db.utils.OperationalError: could not connect to server: Connection
refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5432?
==> Steps to Reproduce <==
$ sudo service postgresql stop
* Stopping PostgreSQL 9.3 database server
[ OK ]
$ sudo service maas-clusterd stop
maas-clusterd stop/waiting
$ sudo service maas-regiond stop
maas-regiond stop/waiting
$ sudo service maas-regiond start
maas-regiond start/running, process 10964
(then hit the MAAS web page)
(Note: this was seen upon system boot.)
==> Workaround <==
$ sudo service maas-clusterd restart
** Affects: maas (Ubuntu)
Importance: Undecided
Status: New
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Server Team, which is subscribed to maas in Ubuntu.
https://bugs.launchpad.net/bugs/1421377
Title:
"MAAS failed to start" recurs if postgresql is stopped
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