ZOREIDE

High Availability daemon to share an IP around N servers.

Zoreide is a daemon service you can use to share an IP among N servers. If the server owning the IP is down, another one will replace it. Differently than Keepalived, it allows N servers instead of just 2. Perfect for docker-swarm arrays.

The daemon uses Multicast in order to elect the node which will have the IP configured.

To use it, you need:

• root access to the servers
• a valid multicast IP address in your network. (otherwise you can use the ones in zoreide.json)
• linux servers under the same router.

To compile it , you need:

• golang compiler 1.21 or superior.
• git , to download this repo.
• write "go build"
• ./zoreide &

Configuration contains:

{
  "MulticastConfig": {
    "MIpAddr": "239.0.0.19",
    "MPort": "9898",
    "MaxDatagramSize": 18
  },
  "InterfaceConfig": {
    "ExistingInterface": "eth0",
    "BridgeIpCIDR": "10.0.1.1/24"
  },
  "debug": false
  }

Where:

• MIpAddr is the multicast address all the nodes will use to align.Must be the same on all nodes.

• Mport: Multicast port to subscribe. Must be the same on all nodes.

• MaxDataGramSize : obsolete, will be removed soon.

• ExistingInterface: the name of your ingress interface (eth0, eno0 , enps18, whatever your system is using. This may be different node by node)

• BridgeIpCidr: the IP address and mask you want to share among servers.

• wether you want debug logs or not.

FAQ

• why? Keepalived wasn't enough?

• VRRP is ok, but it has just two states, active and passive. I want to have as much as nodes as I want.

• why you need more than one server to share the IP?

• because 6 is better than 2 for HA.

• MetalLb under Kubernetes can achieve the same.

• Nobody really needs kubernetes with less than 20 servers. I want a floating , HA IP without this.