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cni.go
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cni.go
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/*
* Copyright 2019 gosoon.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package installcni
import (
"bytes"
"html/template"
"strings"
"github.com/gosoon/kubernetes-operator/pkg/exec"
"github.com/gosoon/kubernetes-operator/pkg/internal/cluster/create/actions"
"github.com/pkg/errors"
)
type action struct{}
// NewAction returns a new action for installing default CNI
func NewAction() actions.Action {
return &action{}
}
// Execute runs the action
func (a *action) Execute(ctx *actions.ActionContext) error {
ctx.Status.Start("Installing CNI")
defer ctx.Status.End(false)
// read the manifest from the node
var raw bytes.Buffer
if err := exec.Command("cat", "/tmp/install/kubernetes/manifests/default-cni.yaml").SetStdout(&raw).Run(); err != nil {
return errors.Wrap(err, "failed to read CNI manifest")
}
manifest := raw.String()
// note:the default networking is calico, version is v3.8
if strings.Contains(manifest, "networking manifest") {
t, err := template.New("cni-manifest").Parse(manifest)
if err != nil {
return errors.Wrap(err, "failed to parse CNI manifest template")
}
var out bytes.Buffer
err = t.Execute(&out, &struct {
PodSubnet string
}{
PodSubnet: ctx.Cluster.Config.Networking.PodSubnet,
})
if err != nil {
return errors.Wrap(err, "failed to execute CNI manifest template")
}
manifest = out.String()
}
// install the manifest
if err := exec.Command(
"kubectl", "create", "--kubeconfig=/etc/kubernetes/admin.conf",
"-f", "-",
).SetStdin(strings.NewReader(manifest)).Run(); err != nil {
return errors.Wrap(err, "failed to apply overlay network")
}
// mark success
ctx.Status.End(true)
return nil
}