79 lines
3.1 KiB
Go
79 lines
3.1 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package server
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import (
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"os"
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"path/filepath"
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"text/template"
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cni "github.com/containerd/go-cni"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"golang.org/x/net/context"
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runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
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)
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// cniConfigTemplate contains the values containerd will overwrite
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// in the cni config template.
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type cniConfigTemplate struct {
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// PodCIDR is the cidr for pods on the node.
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PodCIDR string
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}
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// cniConfigFileName is the name of cni config file generated by containerd.
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const cniConfigFileName = "10-containerd-net.conflist"
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// UpdateRuntimeConfig updates the runtime config. Currently only handles podCIDR updates.
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func (c *criService) UpdateRuntimeConfig(ctx context.Context, r *runtime.UpdateRuntimeConfigRequest) (*runtime.UpdateRuntimeConfigResponse, error) {
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podCIDR := r.GetRuntimeConfig().GetNetworkConfig().GetPodCidr()
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if podCIDR == "" {
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return &runtime.UpdateRuntimeConfigResponse{}, nil
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}
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confTemplate := c.config.NetworkPluginConfTemplate
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if confTemplate == "" {
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logrus.Info("No cni config template is specified, wait for other system components to drop the config.")
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return &runtime.UpdateRuntimeConfigResponse{}, nil
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}
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if err := c.netPlugin.Status(); err == nil {
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logrus.Infof("Network plugin is ready, skip generating cni config from template %q", confTemplate)
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return &runtime.UpdateRuntimeConfigResponse{}, nil
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} else if err := c.netPlugin.Load(cni.WithLoNetwork, cni.WithDefaultConf); err == nil {
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logrus.Infof("CNI config is successfully loaded, skip generating cni config from template %q", confTemplate)
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return &runtime.UpdateRuntimeConfigResponse{}, nil
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}
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logrus.Infof("Generating cni config from template %q", confTemplate)
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// generate cni config file from the template with updated pod cidr.
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t, err := template.ParseFiles(confTemplate)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to parse cni config template %q", confTemplate)
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}
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if err := os.MkdirAll(c.config.NetworkPluginConfDir, 0755); err != nil {
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return nil, errors.Wrapf(err, "failed to create cni config directory: %q", c.config.NetworkPluginConfDir)
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}
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confFile := filepath.Join(c.config.NetworkPluginConfDir, cniConfigFileName)
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f, err := os.OpenFile(confFile, os.O_WRONLY|os.O_CREATE, 0644)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to open cni config file %q", confFile)
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}
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defer f.Close()
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if err := t.Execute(f, cniConfigTemplate{PodCIDR: podCIDR}); err != nil {
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return nil, errors.Wrapf(err, "failed to generate cni config file %q", confFile)
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}
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return &runtime.UpdateRuntimeConfigResponse{}, nil
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}
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