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Posted to dev@stratos.apache.org by "Martin Eppel (meppel)" <me...@cisco.com> on 2014/10/15 02:21:19 UTC
[Question] Maintenance mode in stratos (now and future) ?
Hi,
Does stratos has a concept of a maintenance mode, for example, is there a way to put a cartridge instance or even the octl in a maintenance mode and what will a "user" be able to do in the maintenance mode ?
An example of a maintenance mode would be that the cartridge would be not active (for example not taking any service requests) but would also not being killed by the octl ? Also, how would a "user" be able to move the cartridge back into the active state ?
Is there potentially programmatic way to move a cartridge into the maintenance mode ?
Thanks
Martin
RE: [Question] Maintenance mode in stratos (now and future) ?
Posted by "Martin Eppel (meppel)" <me...@cisco.com>.
Thanks !
From: Udara Liyanage [mailto:udara@wso2.com]
Sent: Tuesday, October 14, 2014 8:28 PM
To: dev
Cc: Lakmal Warusawithana
Subject: Re: [Question] Maintenance mode in stratos (now and future) ?
Hi,
Please refer to the email thread "[DISCUSS] Patching exiting cartridge instances with updates".
I am copy pasting graceful shutdown section from Lakmal's blog post [1] since it is better described there.
Gracefully Scale down
When auto-scaler decided to scale down, it will notifier instance via “instance notifier” topic. Then instance will gracefully shut down its applications and then update “instance status topic” saying I’m ready to shut down. Then CC will get this new instance status, update the topology and terminate the instance. This will help to do some cleanup, if required, before instance going to terminated
[1] http://lakmalsview.blogspot.com/2013/12/sneak-peek-into-apache-stratos.html
On Wed, Oct 15, 2014 at 8:48 AM, Martin Eppel (meppel) <me...@cisco.com>> wrote:
Hi Udara,
By any chance do you have a reference to the email thread ?
The other question is when an instance goes into maintenance mode, is it clean up (for graceful shutdown) or is there other specific “maintenance” processing done ?
Thanks
Martin
From: Udara Liyanage [mailto:udara@wso2.com<ma...@wso2.com>]
Sent: Tuesday, October 14, 2014 8:04 PM
To: dev
Subject: Re: [Question] Maintenance mode in stratos (now and future) ?
Hi Martin,
I think this is very similar to the patching model we discussed couple of months ago. It is not yet implemented.
In graceful shutdown mode, an instance is sent to maintenance mode before it is terminated. However it is not the maintenance mode you are referring to.
@Reka will be able to provide a better answer about that.
On Wed, Oct 15, 2014 at 5:51 AM, Martin Eppel (meppel) <me...@cisco.com>> wrote:
Hi,
Does stratos has a concept of a maintenance mode, for example, is there a way to put a cartridge instance or even the octl in a maintenance mode and what will a “user” be able to do in the maintenance mode ?
An example of a maintenance mode would be that the cartridge would be not active (for example not taking any service requests) but would also not being killed by the octl ? Also, how would a “user” be able to move the cartridge back into the active state ?
Is there potentially programmatic way to move a cartridge into the maintenance mode ?
Thanks
Martin
--
Udara Liyanage
Software Engineer
WSO2, Inc.: http://wso2.com<http://wso2.com/>
lean. enterprise. middleware
web: http://udaraliyanage.wordpress.com
phone: +94 71 443 6897<tel:%2B94%2071%20443%206897>
--
Udara Liyanage
Software Engineer
WSO2, Inc.: http://wso2.com<http://wso2.com/>
lean. enterprise. middleware
web: http://udaraliyanage.wordpress.com
phone: +94 71 443 6897
Re: [Question] Maintenance mode in stratos (now and future) ?
Posted by Udara Liyanage <ud...@wso2.com>.
Hi,
Please refer to the email thread "[DISCUSS] Patching exiting cartridge
instances with updates".
I am copy pasting graceful shutdown section from Lakmal's blog post [1]
since it is better described there.
Gracefully Scale down
When auto-scaler decided to scale down, it will notifier instance via
“instance notifier” topic. Then instance will gracefully shut down its
applications and then update “instance status topic” saying I’m ready to
shut down. Then CC will get this new instance status, update the topology
and terminate the instance. This will help to do some cleanup, if required,
before instance going to terminated
[1]
http://lakmalsview.blogspot.com/2013/12/sneak-peek-into-apache-stratos.html
On Wed, Oct 15, 2014 at 8:48 AM, Martin Eppel (meppel) <me...@cisco.com>
wrote:
> Hi Udara,
>
>
>
> By any chance do you have a reference to the email thread ?
>
> The other question is when an instance goes into maintenance mode, is it
> clean up (for graceful shutdown) or is there other specific “maintenance”
> processing done ?
>
>
>
> Thanks
>
>
>
> Martin
>
>
>
> *From:* Udara Liyanage [mailto:udara@wso2.com]
> *Sent:* Tuesday, October 14, 2014 8:04 PM
> *To:* dev
> *Subject:* Re: [Question] Maintenance mode in stratos (now and future) ?
>
>
>
> Hi Martin,
>
>
>
> I think this is very similar to the patching model we discussed couple of
> months ago. It is not yet implemented.
>
>
>
> In graceful shutdown mode, an instance is sent to maintenance mode before
> it is terminated. However it is not the maintenance mode you are referring
> to.
>
> @Reka will be able to provide a better answer about that.
>
>
>
> On Wed, Oct 15, 2014 at 5:51 AM, Martin Eppel (meppel) <me...@cisco.com>
> wrote:
>
> Hi,
>
>
>
> Does stratos has a concept of a maintenance mode, for example, is there a
> way to put a cartridge instance or even the octl in a maintenance mode and
> what will a “user” be able to do in the maintenance mode ?
>
> An example of a maintenance mode would be that the cartridge would be not
> active (for example not taking any service requests) but would also not
> being killed by the octl ? Also, how would a “user” be able to move the
> cartridge back into the active state ?
>
> Is there potentially programmatic way to move a cartridge into the
> maintenance mode ?
>
>
>
> Thanks
>
>
>
> Martin
>
>
>
>
>
>
>
>
>
> --
>
>
> Udara Liyanage
>
> Software Engineer
>
> WSO2, Inc.: http://wso2.com
>
> lean. enterprise. middleware
>
> web: http://udaraliyanage.wordpress.com
>
> phone: +94 71 443 6897
>
--
Udara Liyanage
Software Engineer
WSO2, Inc.: http://wso2.com
lean. enterprise. middleware
web: http://udaraliyanage.wordpress.com
phone: +94 71 443 6897
RE: [Question] Maintenance mode in stratos (now and future) ?
Posted by "Martin Eppel (meppel)" <me...@cisco.com>.
Hi Udara,
By any chance do you have a reference to the email thread ?
The other question is when an instance goes into maintenance mode, is it clean up (for graceful shutdown) or is there other specific “maintenance” processing done ?
Thanks
Martin
From: Udara Liyanage [mailto:udara@wso2.com]
Sent: Tuesday, October 14, 2014 8:04 PM
To: dev
Subject: Re: [Question] Maintenance mode in stratos (now and future) ?
Hi Martin,
I think this is very similar to the patching model we discussed couple of months ago. It is not yet implemented.
In graceful shutdown mode, an instance is sent to maintenance mode before it is terminated. However it is not the maintenance mode you are referring to.
@Reka will be able to provide a better answer about that.
On Wed, Oct 15, 2014 at 5:51 AM, Martin Eppel (meppel) <me...@cisco.com>> wrote:
Hi,
Does stratos has a concept of a maintenance mode, for example, is there a way to put a cartridge instance or even the octl in a maintenance mode and what will a “user” be able to do in the maintenance mode ?
An example of a maintenance mode would be that the cartridge would be not active (for example not taking any service requests) but would also not being killed by the octl ? Also, how would a “user” be able to move the cartridge back into the active state ?
Is there potentially programmatic way to move a cartridge into the maintenance mode ?
Thanks
Martin
--
Udara Liyanage
Software Engineer
WSO2, Inc.: http://wso2.com<http://wso2.com/>
lean. enterprise. middleware
web: http://udaraliyanage.wordpress.com
phone: +94 71 443 6897
RE: [Question] Maintenance mode in stratos (now and future) ?
Posted by "Martin Eppel (meppel)" <me...@cisco.com>.
Hi,
I followed up on the discussion thread mentioned below ().
In one of the replies there is a “CLUSTER_INMAINTAINENCE_MODE” mentioned (see link below) – what does it do and how is it invoked respectively how is cluster moved back to ACTIVE (I checked the code but couldn’t really find it where this state is invoked)
The other questions I had are,
+ the MemberMaintenanceModeEvent puts a cluster member into the maintenance mode but it only seems to happen when the autoscaler scales down, cleans up the cluster through the InstanceCleanupNotificationService, and it is only an intermediary state before terminating the instance, is this correct ?
+ Are there any plans to implement the patching model which was discussed in the thread ?
Thanks
Martin
http://mail-archives.apache.org/mod_mbox/stratos-dev/201407.mbox/%3CCAFhGutJBUn-7FYOOhbQNwEiayr-YPzfnDs45=eEjs4gEBB+2yQ@mail.gmail.com%3E
From: Udara Liyanage [mailto:udara@wso2.com]
Sent: Tuesday, October 14, 2014 8:04 PM
To: dev
Subject: Re: [Question] Maintenance mode in stratos (now and future) ?
Hi Martin,
I think this is very similar to the patching model we discussed couple of months ago. It is not yet implemented.
In graceful shutdown mode, an instance is sent to maintenance mode before it is terminated. However it is not the maintenance mode you are referring to.
@Reka will be able to provide a better answer about that.
On Wed, Oct 15, 2014 at 5:51 AM, Martin Eppel (meppel) <me...@cisco.com>> wrote:
Hi,
Does stratos has a concept of a maintenance mode, for example, is there a way to put a cartridge instance or even the octl in a maintenance mode and what will a “user” be able to do in the maintenance mode ?
An example of a maintenance mode would be that the cartridge would be not active (for example not taking any service requests) but would also not being killed by the octl ? Also, how would a “user” be able to move the cartridge back into the active state ?
Is there potentially programmatic way to move a cartridge into the maintenance mode ?
Thanks
Martin
--
Udara Liyanage
Software Engineer
WSO2, Inc.: http://wso2.com<http://wso2.com/>
lean. enterprise. middleware
web: http://udaraliyanage.wordpress.com
phone: +94 71 443 6897
Re: [Question] Maintenance mode in stratos (now and future) ?
Posted by Udara Liyanage <ud...@wso2.com>.
Hi Martin,
I think this is very similar to the patching model we discussed couple of
months ago. It is not yet implemented.
In graceful shutdown mode, an instance is sent to maintenance mode before
it is terminated. However it is not the maintenance mode you are referring
to.
@Reka will be able to provide a better answer about that.
On Wed, Oct 15, 2014 at 5:51 AM, Martin Eppel (meppel) <me...@cisco.com>
wrote:
> Hi,
>
>
>
> Does stratos has a concept of a maintenance mode, for example, is there a
> way to put a cartridge instance or even the octl in a maintenance mode and
> what will a “user” be able to do in the maintenance mode ?
>
> An example of a maintenance mode would be that the cartridge would be not
> active (for example not taking any service requests) but would also not
> being killed by the octl ? Also, how would a “user” be able to move the
> cartridge back into the active state ?
>
> Is there potentially programmatic way to move a cartridge into the
> maintenance mode ?
>
>
>
> Thanks
>
>
>
> Martin
>
>
>
>
>
--
Udara Liyanage
Software Engineer
WSO2, Inc.: http://wso2.com
lean. enterprise. middleware
web: http://udaraliyanage.wordpress.com
phone: +94 71 443 6897