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Cache Prerequisites

Cache locations have to be prepared upfront on the Cache servers. Considering the performance it is recommended to use local disks, ideally SSDs. Your disk performance depends on the available uplink. For servers on beefier bandwidth links consider using NVMe or TMPFS disks. Ideally there will be a support for mixed caches withing a single region and cluster.

Setup Steps

  • Prepare the storage locations, e.g. /var/cache/ssd
  • Mark your nodes with a label edgecdnx.com/cache: ssd
  • Deploy the Ingress controller as a Daemonset

Cache types

Each cache server should be designated only to a single cache type. In the future we will put effort in having multiple cache types on a single server.

Networking

We wan't to lower the overhead as much as possible. No thorough performance tests were made yet, but consider the following measures:

  • If possible use HostNetworking
  • Consider CNI with eBPF support (e.g. Cilium)
  • Consider High performance networking with NIC with SR-IOV injected to the NGINX prod with Multus CNI.
  • If possible, assign Public IPs directly to the hosts.
  • Alternatively, place an LB in front of the machines to improve HA. This will likely reduce Cache HIT ratio if hashing on the LB is not available.