centralip

Introduction

The centralip IPAM plugin use the etcd-v3 to handle all ip management. We provide two mode to decide how to dispatch the ip address. Node mode and clster mode. In the cluster mode, we even don't provide the gateway address for each node and we hope the SDN controller should handle this, such as ONOS.

config

The config of centralip like below.

   "ipam":{
       "type":"centralip",
       "ipType": "node",
       "network":"10.245.0.0/16",
       "subnetLen": 24,
       "subnetMin": "10.245.5.0",
       "subnetMax": "10.245.50.0",
       "etcdURL": "127.0.0.1:2379"
   }

ipType

We have two backends now, node and cluster.

In the node mode, You need to specify all the following options and it will assign different ip subnet to each node.

In the ohter hand, the cluster mode, you only set the network and etcdURL options. The cluster will assign the IP address to all nodes in the same subnet. In this mode, we won't provide the gateway address for you, so don't set the IsDefaultGatway option in your CNI configuration. You can see two example configs in the ../../examples

network

This field indicate the whole network subnet you want to use.

subnetLen

This length and network will decide the CIDR for each node. For example, the centralip will dispatch the subnet 10.245.1.0/24, 10.245.2.0/24.... 10.245.255.0/24

subnetMin/subnetMax

Those two fields is used to indicate the range of subnets you want to dispatch for each node.

etcdURL

The ip address of etcd-v3 server. If you want to connect to etcd-v3 servier with TLS, you should also indicate the location of three files, including Certificate, Key and TrustedCA. And you should use the following key to describe your location to CNI.

       "etcdURL": "https://127.0.0.1:2379",
       "etcdCertFile": "/etc/ovs/certs/cert.crt",
       "etcdKeyFile": "/etc/ovs/certs/key.pem",
       "etcdTrustedCAFileFile": "/etc/ovs/certs/ca_cert.crt"