Hi Dmitriy, Thanks for the response. Sorry, I forgot to mention that i used kolla ansible for deployment. As per kolla docs, glance-api container runs only in one controller. So i am looking from kolla perspective if it can automatically switch it over other available controllers.

Regards Pradeep

On Fri, 9 Dec 2022 at 14:51, Dmitriy Rabotyagov noonedeadpunk@gmail.com wrote:

Hi,

I'm not sure if you used any deployment tool for your environment, but usually for such failover there's a load balancer in conjunction with VRRP or Anycast, that able to detect when controller1 is down and forward traffic to another controller.

As example, OpenStack-Ansible as default option installs haproxy to each controller and keepalived to implement VRRP and Virtual IPs. So when glance is down on controller1, haproxy will detect that and forward traffic to other controllers. If controller1 is down as a whole, keepalived will detect that and raise VIP on controller2, so all client traffic will go there. Since controller2 also have haproxy, it will pass traffic to available backends based on the source IP.

пт, 9 дек. 2022 г., 09:06 pradeep pradeep8985@gmail.com:

...

Hello All,

I understand that glance-api container run only one controller always. I have tried to check if the glance-api container to switch over to the next available controller by means of rebooting and stopping the containers, but nothing happened. Is there a way to make sure that glance-api container switches to other controllers if controller 1 is not available.

Thanks for you help

Regards Pradeep

Kolla only uses a single controller if you use file based backend by default. If you want to continue using the file backend, you can use something like an NFS share to share images between controllers and then change the glance_file_datadir_volume parameter which will result in the api being deployed on all controllers ________________________________ From: pradeep pradeep8985@gmail.com Sent: 12 December 2022 04:53 To: Dmitriy Rabotyagov noonedeadpunk@gmail.com Cc: openstack-discuss openstack-discuss@lists.openstack.org Subject: Re: auto switch of glance-api containers to other controllers

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________________________________ Any help is highly appreciated.

Thank you!

On Fri, 9 Dec 2022 at 21:46, pradeep <pradeep8985@gmail.commailto:pradeep8985@gmail.com> wrote: Hi Dmitriy, Thanks for the response. Sorry, I forgot to mention that i used kolla ansible for deployment. As per kolla docs, glance-api container runs only in one controller. So i am looking from kolla perspective if it can automatically switch it over other available controllers.

Regards Pradeep

On Fri, 9 Dec 2022 at 14:51, Dmitriy Rabotyagov <noonedeadpunk@gmail.commailto:noonedeadpunk@gmail.com> wrote: Hi,

I'm not sure if you used any deployment tool for your environment, but usually for such failover there's a load balancer in conjunction with VRRP or Anycast, that able to detect when controller1 is down and forward traffic to another controller.

As example, OpenStack-Ansible as default option installs haproxy to each controller and keepalived to implement VRRP and Virtual IPs. So when glance is down on controller1, haproxy will detect that and forward traffic to other controllers. If controller1 is down as a whole, keepalived will detect that and raise VIP on controller2, so all client traffic will go there. Since controller2 also have haproxy, it will pass traffic to available backends based on the source IP.

пт, 9 дек. 2022 г., 09:06 pradeep <pradeep8985@gmail.commailto:pradeep8985@gmail.com>: Hello All,

I understand that glance-api container run only one controller always. I have tried to check if the glance-api container to switch over to the next available controller by means of rebooting and stopping the containers, but nothing happened. Is there a way to make sure that glance-api container switches to other controllers if controller 1 is not available.

Thanks for you help

Regards Pradeep

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