k3s/agent/flannel/setup.go

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2019-01-01 08:23:01 +00:00
package flannel
import (
"context"
"strings"
"time"
"github.com/rancher/rio/agent/util"
"github.com/rancher/rio/agent/config"
"github.com/sirupsen/logrus"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
)
const (
cniConf = `{
"name":"cbr0",
"cniVersion":"0.3.1",
"plugins":[
{
"type":"flannel",
"delegate":{
"forceAddress":true,
"isDefaultGateway":true
}
},
{
"type":"portmap",
"capabilities":{
"portMappings":true
}
}
]
}
`
netJson = `{
"Network": "%CIDR%",
"Backend": {
"Type": "vxlan"
}
}
`
)
func Run(ctx context.Context, config *config.NodeConfig) error {
nodeName := config.AgentConfig.NodeName
restConfig, err := clientcmd.BuildConfigFromFlags("", config.AgentConfig.KubeConfig)
if err != nil {
return err
}
client, err := kubernetes.NewForConfig(restConfig)
if err != nil {
return err
}
for {
node, err := client.CoreV1().Nodes().Get(nodeName, metav1.GetOptions{})
if err == nil && node.Spec.PodCIDR != "" {
break
}
if err == nil {
logrus.Infof("waiting for node %s CIDR not assigned yet", nodeName)
} else {
logrus.Infof("waiting for node %s: %v", nodeName, err)
}
time.Sleep(2 * time.Second)
}
if err := createCNIConf(); err != nil {
return err
}
if err := createFlannelConf(config); err != nil {
return err
}
return flannel(ctx, config.AgentConfig.KubeConfig)
}
func createCNIConf() error {
return util.WriteFile("/etc/cni/net.d/10-flannel.conflist", cniConf)
}
func createFlannelConf(config *config.NodeConfig) error {
return util.WriteFile("/etc/kube-flannel/net-conf.json",
strings.Replace(netJson, "%CIDR", config.AgentConfig.ClusterCIDR.String(), -1))
}