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From: Christopher Fogarty <Christopher.Fogarty@Versiant.com>
To: "users@activemq.apache.org" <users@activemq.apache.org>
Subject: RE: Testing Master Slave on Shared File System
Thread-Topic: Testing Master Slave on Shared File System
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Date: Fri, 29 Apr 2016 14:54:17 +0000
Message-ID: <88afe28bc01b4c559677ae9d0005d494@SVEEXCH01.Versiant.net>
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 <96C0DDE9-BE65-4446-B484-FFBC0B8CE46D@pronoia-solutions.com>
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Quinn

Thanks. I could use NFS, but the master slave shared docs (very Spartan) in=
dicated SAN. If ext4 is not the proper filesystem. What should I use? I cou=
ld use NFS, but I was concerned over performance. Also, NFS in a VM environ=
ment would require a third server?

Node 1
Node 2
NFS server (I would not think it would be prudent to use nfs from one of th=
e two nodes?)

Chris Fogarty

VP, System Engineering
Versiant Corporation
3700 Arco Corporate Drive
Suite 350
Charlotte, NC 28273
Office: (704) 831-3905 | Mobile: (704) 763-3333

Chris.Fogarty@Versiant.com

-----Original Message-----
From: Quinn Stevenson [mailto:quinn@pronoia-solutions.com]=20
Sent: Friday, April 29, 2016 10:45 AM
To: users@activemq.apache.org
Subject: Re: Testing Master Slave on Shared File System

I've done quite a bit of master/slave setups - they've never been an issue =
as long as I had a filesystem that supported locking.  I've used NFSv4 and =
GFSv2 for these setups.

If I'm reading this correctly, you've setup a volume on a SAN and mounted i=
t on both systems as an ext4 filesystem.  If that's the case, I think that =
is your issue - ext4 is not a shared filesystem and it isn't cluster aware.=
 =20

Can you try using NFSv4?

> On Apr 29, 2016, at 8:37 AM, Matt Pavlovich <mattrpav@gmail.com> wrote:
>=20
> Are both volumes mounted with ext4? Does EXT4 have support for distribute=
d lock sharing?  Sounds like one server would mount rw and the other would =
be mounted ro and there aren't any shared locks.
>=20
> I'm not as current on the latest EXT4 features, but do know a cluster-awa=
re filesystem such as GFSv2 is designed for this type of setup.
>=20
> -Matt
>=20
> On 4/28/16 3:14 PM, Christopher Fogarty wrote:
>> I have the disk a part of its on vggroup and an lv carved out of that wi=
th ext 4 file system on it. This is mounted on both systems and I am able t=
o start active mq fine. But would feel a lot better validating that only on=
e of the two nodes actually has a lock. I would love even more to verify th=
at both nodes when started are doing what they should, which is one has a l=
ocked access and the other is in a sort of stand by until the lock is relea=
sed.
>>=20
>> Hope this makes sense.
>>=20
>> Chris Fogarty
>>=20
>>=20
>>=20
>>=20
>>=20
>> On Thu, Apr 28, 2016 at 12:37 PM -0700, "Matt Pavlovich" <mattrpav@gmail=
.com<mailto:mattrpav@gmail.com>> wrote:
>>=20
>> Chris-
>>=20
>> What file system are you using to share the mount?  The filesystem=20
>> would need to support distributed locking (many "shareable=20
>> filesystems" don't do this properly.
>>=20
>> The other approach is to use the shared filesystem for KahaDB and a=20
>> database lease-locker to work around the=20
>> most-shared-filesystems-don't-do-locking-properly problem.
>>=20
>> -Matt
>>=20
>> On 4/28/16 12:34 PM, Christopher Fogarty wrote:
>>> I have set up two servers:
>>>=20
>>> Both CENTOS with a shared SAN disk mounted and active on both nodes.
>>>=20
>>> I have set up ActiveMQ 5.6
>>>=20
>>> I am able to start each with the following configuration
>>>=20
>>> <persistenceAdapter>
>>>    <kahaDB directory=3D"/sharedFileSystem/sharedBrokerData"/>
>>> </persistenceAdapter>
>>>=20
>>> Each node can and does start, but how can I test, or what do I look for=
 to make sure that file locking is actually working as described in the htt=
p://activemq.apache.org/shared-file-system-master-slave.html document.  Bef=
ore putting this into production, I would feel a lot better knowing that on=
ly one of the two nodes is capable of accessing the kahadb.
>>>=20
>>>=20
>>> Chris Fogarty
>>>=20
>>> VP, System Engineering
>>> Versiant Corporation
>>> 3700 Arco Corporate Drive
>>> Suite 350
>>> Charlotte, NC 28273
>>> Office: (704) 831-3905 | Mobile: (704) 763-3333
>>>=20
>>> Chris.Fogarty@Versiant.com
>>>=20
>>> -----Original Message-----
>>> From: Christopher Fogarty
>>> Sent: Wednesday, April 27, 2016 9:02 AM
>>> To: 'users@activemq.apache.org' <users@activemq.apache.org>
>>> Subject: RE: Running ActiveMQ Broker as different username unable to=20
>>> connect via web admin console
>>>=20
>>> What Platform? Do you have a firewall running
>>>=20
>>> Chris Fogarty
>>>=20
>>> VP, System Engineering
>>> Versiant Corporation
>>> 3700 Arco Corporate Drive
>>> Suite 350
>>> Charlotte, NC 28273
>>> Office: (704) 831-3905 | Mobile: (704) 763-3333
>>>=20
>>> Chris.Fogarty@Versiant.com
>>>=20
>>> -----Original Message-----
>>> From: jboss [mailto:jboss@bcidaho.com]
>>> Sent: Wednesday, April 27, 2016 8:16 AM
>>> To: users@activemq.apache.org
>>> Subject: Re: Running ActiveMQ Broker as different username unable to=20
>>> connect via web admin console
>>>=20
>>> The web console does not come up at all.   The error that the Chrome gi=
ves is
>>> "Connection Refused".  Does not even get to the point of asking for use=
rname/password.
>>>=20
>>> Thanks,
>>>=20
>>>=20
>>>=20
>>>=20
>>> --
>>> View this message in context:=20
>>> http://activemq.2283324.n4.nabble.com/Running-ActiveMQ-Broker-as-dif
>>> ferent-username-unable-to-connect-via-web-admin-console-tp4711175p47
>>> 11280.html Sent from the ActiveMQ - User mailing list archive at=20
>>> Nabble.com.
>>=20
>=20