/
kubeadm_config.go
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/
kubeadm_config.go
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// Copyright © 2021 Alibaba Group Holding Ltd.
//
// 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 kubeadm
import (
"fmt"
"io"
"net"
"strings"
"k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta3"
versionUtils "github.com/sealerio/sealer/utils/version"
"github.com/sirupsen/logrus"
"github.com/sealerio/sealer/utils"
strUtils "github.com/sealerio/sealer/utils/strings"
"github.com/imdario/mergo"
"k8s.io/kube-proxy/config/v1alpha1"
"k8s.io/kubelet/config/v1beta1"
)
// Read config from https://github.com/sealerio/sealer/blob/main/docs/design/clusterfile-v2.md and overwrite default kubeadm.yaml
// Use github.com/imdario/mergo to merge kubeadm config in Clusterfile and the default kubeadm config
// Using a config filter to handle some edge cases
// https://github.com/kubernetes/kubernetes/blob/master/cmd/kubeadm/app/apis/kubeadm/v1beta3/types.go
// Using map to overwrite Kubeadm configs
// nolint
type KubeadmConfig struct {
v1beta3.InitConfiguration
v1beta3.ClusterConfiguration
v1alpha1.KubeProxyConfiguration
v1beta1.KubeletConfiguration
v1beta3.JoinConfiguration
}
const (
EtcdServers = "etcd-servers"
)
const (
V1991 = "v1.19.1"
V1992 = "v1.19.2"
V1150 = "v1.15.0"
V1200 = "v1.20.0"
V1230 = "v1.23.0"
// kubeadm api version
KubeadmV1beta1 = "kubeadm.k8s.io/v1beta1"
KubeadmV1beta2 = "kubeadm.k8s.io/v1beta2"
KubeadmV1beta3 = "kubeadm.k8s.io/v1beta3"
)
// LoadFromClusterfile :Load KubeadmConfig from Clusterfile.
// If it has `KubeadmConfig` in Clusterfile, load every field to each configuration.
// If Kubeadm raw config in Clusterfile, just load it.
func (k *KubeadmConfig) LoadFromClusterfile(kubeadmConfig KubeadmConfig) error {
k.APIServer.CertSANs = strUtils.RemoveDuplicate(append(k.APIServer.CertSANs, kubeadmConfig.APIServer.CertSANs...))
return mergo.Merge(k, kubeadmConfig)
}
// Merge Using github.com/imdario/mergo to merge KubeadmConfig to the ClusterImage default kubeadm config, overwrite some field.
// if defaultKubeadmConfig file not exist, use default raw kubeadm config to merge k.KubeConfigSpec empty value
func (k *KubeadmConfig) Merge(kubeadmYamlPath string, decode func(arg string, kind string) (interface{}, error)) error {
newConfig, err := LoadKubeadmConfigs(kubeadmYamlPath, decode)
if err != nil {
return fmt.Errorf("failed to found kubeadm config from %s: %v", kubeadmYamlPath, err)
}
k.APIServer.CertSANs = strUtils.RemoveDuplicate(append(k.APIServer.CertSANs, newConfig.APIServer.CertSANs...))
return mergo.Merge(k, newConfig)
}
func (k *KubeadmConfig) setAPIVersion(apiVersion string) {
k.InitConfiguration.APIVersion = apiVersion
k.ClusterConfiguration.APIVersion = apiVersion
k.JoinConfiguration.APIVersion = apiVersion
}
func (k *KubeadmConfig) setKubeadmAPIVersion() {
kv := versionUtils.Version(k.KubernetesVersion)
greaterThanKV1150, err := kv.GreaterThan(V1150)
if err != nil {
logrus.Errorf("compare kubernetes version failed: %s", err)
}
greaterThanKV1230, err := kv.GreaterThan(V1230)
if err != nil {
logrus.Errorf("compare kubernetes version failed: %s", err)
}
switch {
case greaterThanKV1150 && !greaterThanKV1230:
k.setAPIVersion(KubeadmV1beta2)
case greaterThanKV1230:
k.setAPIVersion(KubeadmV1beta3)
default:
// Compatible with versions 1.14 and 1.13. but do not recommend.
k.setAPIVersion(KubeadmV1beta1)
}
}
func (k *KubeadmConfig) GetCertSANS() []string {
return k.ClusterConfiguration.APIServer.CertSANs
}
func (k *KubeadmConfig) GetDNSDomain() string {
return k.ClusterConfiguration.Networking.DNSDomain
}
func (k *KubeadmConfig) GetSvcCIDR() string {
return k.ClusterConfiguration.Networking.ServiceSubnet
}
func LoadKubeadmConfigs(arg string, decode func(arg string, kind string) (interface{}, error)) (KubeadmConfig, error) {
kubeadmConfig := KubeadmConfig{}
initConfig, err := decode(arg, InitConfiguration)
if err != nil && err != io.EOF {
return kubeadmConfig, err
} else if initConfig != nil {
kubeadmConfig.InitConfiguration = *initConfig.(*v1beta3.InitConfiguration)
}
clusterConfig, err := decode(arg, ClusterConfiguration)
if err != nil && err != io.EOF {
return kubeadmConfig, err
} else if clusterConfig != nil {
kubeadmConfig.ClusterConfiguration = *clusterConfig.(*v1beta3.ClusterConfiguration)
}
kubeProxyConfig, err := decode(arg, KubeProxyConfiguration)
if err != nil && err != io.EOF {
return kubeadmConfig, err
} else if kubeProxyConfig != nil {
kubeadmConfig.KubeProxyConfiguration = *kubeProxyConfig.(*v1alpha1.KubeProxyConfiguration)
}
kubeletConfig, err := decode(arg, KubeletConfiguration)
if err != nil && err != io.EOF {
return kubeadmConfig, err
} else if kubeletConfig != nil {
kubeadmConfig.KubeletConfiguration = *kubeletConfig.(*v1beta1.KubeletConfiguration)
}
joinConfig, err := decode(arg, JoinConfiguration)
if err != nil && err != io.EOF {
return kubeadmConfig, err
} else if joinConfig != nil {
kubeadmConfig.JoinConfiguration = *joinConfig.(*v1beta3.JoinConfiguration)
}
return kubeadmConfig, nil
}
func getEtcdEndpointsWithHTTPSPrefix(masters []net.IP) string {
var tmpSlice []string
for _, ip := range masters {
tmpSlice = append(tmpSlice, fmt.Sprintf("https://%s", net.JoinHostPort(ip.String(), "2379")))
}
return strings.Join(tmpSlice, ",")
}
func NewKubeadmConfig(fromClusterFile KubeadmConfig, fromFile string, masters []net.IP, apiServerDomain,
cgroupDriver string, imageRepo string, apiServerVIP net.IP, extraSANs []string) (KubeadmConfig, error) {
conf := KubeadmConfig{}
if err := conf.LoadFromClusterfile(fromClusterFile); err != nil {
return conf, fmt.Errorf("failed to load kubeadm config from clusterfile: %v", err)
}
// TODO handle the kubeadm config, like kubeproxy config
//The configuration set here does not require merge
conf.InitConfiguration.LocalAPIEndpoint.AdvertiseAddress = masters[0].String()
conf.ControlPlaneEndpoint = net.JoinHostPort(apiServerDomain, "6443")
if conf.APIServer.ExtraArgs == nil {
conf.APIServer.ExtraArgs = make(map[string]string)
}
conf.APIServer.ExtraArgs[EtcdServers] = getEtcdEndpointsWithHTTPSPrefix(masters)
conf.IPVS.ExcludeCIDRs = append(conf.KubeProxyConfiguration.IPVS.ExcludeCIDRs, fmt.Sprintf("%s/32", apiServerVIP))
conf.KubeletConfiguration.CgroupDriver = cgroupDriver
conf.ClusterConfiguration.APIServer.CertSANs = []string{"127.0.0.1", apiServerDomain, apiServerVIP.String()}
conf.ClusterConfiguration.APIServer.CertSANs = append(conf.ClusterConfiguration.APIServer.CertSANs, extraSANs...)
for _, m := range masters {
conf.ClusterConfiguration.APIServer.CertSANs = append(conf.ClusterConfiguration.APIServer.CertSANs, m.String())
}
if err := conf.Merge(fromFile, utils.DecodeCRDFromFile); err != nil {
return conf, err
}
if err := conf.Merge(DefaultKubeadmConfig, utils.DecodeCRDFromString); err != nil {
return conf, err
}
conf.setKubeadmAPIVersion()
if conf.ClusterConfiguration.Networking.DNSDomain == "" {
conf.ClusterConfiguration.Networking.DNSDomain = "cluster.local"
}
if conf.JoinConfiguration.Discovery.BootstrapToken == nil {
conf.JoinConfiguration.Discovery.BootstrapToken = &v1beta3.BootstrapTokenDiscovery{}
}
// set cluster image repo,kubeadm will pull container image from this registry.
if conf.ClusterConfiguration.ImageRepository == "" {
conf.ClusterConfiguration.ImageRepository = imageRepo
}
if conf.ClusterConfiguration.DNS.ImageMeta.ImageRepository == "" {
conf.ClusterConfiguration.DNS.ImageMeta.ImageRepository = fmt.Sprintf("%s/%s", imageRepo, "coredns")
}
return conf, nil
}