Can I reserve the ip address across different instances?
I have a few linodes being used and a number of our IOT devices in the field sending their data to these servers.
Currently the devices are configured with the linode servers. In the event of a server going down, can I reconfigure another server with the same IP address used in the previous server?
Along with keepalived, or similar service, you can configure the IP address of the Linode to failover. Here's is a post on configuring keepalived with CentOS 7.
Once the service is configured you would then make changes from within the Linode Manager.
We also recommend taking a look at our guides on High Availability.
Let us know if you have any questions. Don't forget to @pambrosky so I get pinged on your response.