On Thu, Jul 24, 2014 at 11:26 AM, Sajith Kariyawasam <saj...@wso2.com> wrote:
> What I meant was "rebooting" the same instance [1] > > [1] > http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-reboot.html > > While rebooting the instance, agent is down for sometime and AS will terminate the instance assuming instance is a faulty member. then Stratos will spawn a new cartridge instance. Another disadvantage it will violate the high availability concept if we only have a one instance. > > On Thu, Jul 24, 2014 at 11:21 AM, Sajith Kariyawasam <saj...@wso2.com> > wrote: > >> >> On Mon, Jun 30, 2014 at 5:11 PM, Dinesh Bandara <dine...@wso2.com> wrote: >> >>> Hi all, >>> >>> I have faced in to a situation that need to update existing cartridge >>> instances without interrupt the process. AFAIU there are two types of >>> updates that need to be applied. >>> >>> 1. OS level/ Security updates >>> 2. Application level updates (Load balancer, PHP, MySQL) >>> >>> >>> *Patching OS level/ Security updates* >>> >>> Since this is a mandatory update we have to shutdown the server and then >>> need to restart it after successfully update the patch. But this will >>> interrupt the whole process. >>> Cartridge agent related updates can be consider as OS level update. >>> >>> *Solution* >>> >>> - Spawn a new instance and apply the updates. >>> - Terminate exiting instance >>> >>> >> Can't we think of restarting the same instance (After executing updates) >> rather than terminating and spawning a new one? Because terminating and >> starting a new one may incur additional cost, for eg, AFAIK Amazon EC2 >> rates are based on per-hour, so if the instance terminate / re-spawn >> happens in the middle of an hour, it will double the cost per instance >> >>> >>> - >>> - Repeat the above steps until spawn new instances on behalf of >>> existing instances >>> >>> *Patching Application level updates* >>> >>> Status of the cartridge instance set into 'Maintenance' mode, apply >>> updates and then set again as an 'Active' instance >>> >>> *Expose to user* >>> >>> Introduce new rest endpoint via SM which will provide the access to >>> patch selected cluster. >>> >>> As the first step I would like to start with the "patching OS level >>> updates". >>> >>> Highly appreciate your thoughts on this. >>> >>> Thanks, >>> -- >>> *Dinesh Bandara* >>> Software Engineer >>> WSO2 Inc.; http://wso2.com >>> lean.enterprise.middleware >>> >>> >> >> >> -- >> *--* >> *Sajith Kariyawasam* >> *Mobile: +94772269575 <%2B94772269575>* >> > > > > -- > *--* > *Sajith Kariyawasam* > *Mobile: +94772269575 <%2B94772269575>* > -- *Dinesh Bandara* Software Engineer WSO2 Inc.; http://wso2.com lean.enterprise.middleware
