High Availability daemon to share an IP around N servers.
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README.md

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 1.4 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"
  }
}

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.

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. I want a floating , HA IP without this.