Syncing data in pods

Question

I have a situation to which I can find no easy solution and I am looking for some common solutions to this issue.

I have a deployment with three pods doing simple CRUD operations with some HTTP resources. Now if first client POSTs a new resource to one of the pods and second clients posts a GET to some other pod shortly aftwerward, how can I make sure that second client gets the resource from another pod?

This resource is held abstract on purpose, as this problem can appear both with Restful and with database-stored resources ( when application internal caching is used )

Answer 1

Well, you need to share 💾 something if you want the pods to know it at the same time. Some options:

• Shared volume
  • NFS
  • Shared block storage (EBS, Google Persistent Disk, etc. depends on where you are running 🏃)
  • Ceph
  • Glusterfs
  • ...
• Cache
  • Redis
  • Memcached
  • Another DB
• Distributed K/V Stores
  • Zookeeper
  • etcd
  • Consul

You can run all of the above in Kubernetes or separately as long as your pods have network connectivity to these options.

✌️