go-cni
A generic CNI library to provide APIs for CNI plugin interactions. The library provides APIs to:
- Setup networks for container namespace
- Remove networks from container namespace
- Query status of CNI network plugin initialization
go-cni aims to support plugins that implement Container Network Interface
Usage
func main() {
id := "123456"
netns := "/proc/9999/ns/net"
defaultIfName := "eth0"
// Initialize library
l = gocni.New(gocni.WithMinNetworkCount(2),
gocni.WithLoNetwork(),
gocni.WithPluginConfDir("/etc/mycni/net.d"),
gocni.WithPluginDir([]string{"/opt/mycni/bin", "/opt/cni/bin"}),
gocni.WithDefaultIfName(defaultIfName))
// Setup network for namespace.
labels := map[string]string{
"K8S_POD_NAMESPACE": "namespace1",
"K8S_POD_NAME": "pod1",
"K8S_POD_INFRA_CONTAINER_ID": id,
}
result, err := l.Setup(id, netns, gocni.WithLabels(labels))
if err != nil {
return nil, fmt.Errorf("failed to setup network for namespace %q: %v", id, err)
}
defer func() {
if retErr != nil {
// Teardown network if an error is returned.
if err := l.Remove(id, netns, gocni.WithLabels(labels)); err != nil {
fmt.Errorf("Failed to destroy network for namespace %q", id)
}
}
}()
// Get IP of the default interface
IP := result.Interfaces[defaultIfName].IPConfigs[0].IP.String()
fmt.Printf("IP of the default interface %s:%s", defaultIfName, IP)
}