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userdata.go
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userdata.go
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package nodebootstrap
import (
"encoding/base64"
"encoding/json"
"fmt"
"net"
"strconv"
"strings"
"github.com/pkg/errors"
"github.com/weaveworks/eksctl/pkg/nodebootstrap/assets"
"github.com/weaveworks/eksctl/pkg/nodebootstrap/utils"
kubeletapi "k8s.io/kubelet/config/v1beta1"
api "github.com/weaveworks/eksctl/pkg/apis/eksctl.io/v1alpha5"
"github.com/weaveworks/eksctl/pkg/cloudconfig"
)
const (
configDir = "/etc/eksctl/"
envFile = "kubelet.env"
extraKubeConfFile = "kubelet-extra.json"
commonLinuxBootScript = "bootstrap.helper.sh"
)
//go:generate go run github.com/maxbrunsfeld/counterfeiter/v6 -generate
//counterfeiter:generate -o fakes/fake_bootstrapper.go . Bootstrapper
type Bootstrapper interface {
// UserData returns userdata for bootstrapping nodes
UserData() (string, error)
}
// NewBootstrapper returns the correct bootstrapper for the AMI family
func NewBootstrapper(clusterConfig *api.ClusterConfig, ng *api.NodeGroup) (Bootstrapper, error) {
if ng.ClusterDNS == "" {
clusterDNS, err := GetClusterDNS(clusterConfig)
if err != nil {
return nil, err
}
ng.ClusterDNS = clusterDNS
}
if api.IsWindowsImage(ng.AMIFamily) {
return NewWindowsBootstrapper(clusterConfig, ng), nil
}
switch ng.AMIFamily {
case api.NodeImageFamilyUbuntu2004, api.NodeImageFamilyUbuntu1804:
return NewUbuntuBootstrapper(clusterConfig, ng), nil
case api.NodeImageFamilyBottlerocket:
return NewBottlerocketBootstrapper(clusterConfig, ng), nil
case api.NodeImageFamilyAmazonLinux2:
return NewAL2Bootstrapper(clusterConfig, ng), nil
default:
return nil, errors.Errorf("unrecognized AMI family %q for creating bootstrapper", ng.AMIFamily)
}
}
// NewManagedBootstrapper creates a new bootstrapper for managed nodegroups based on the AMI family
func NewManagedBootstrapper(clusterConfig *api.ClusterConfig, ng *api.ManagedNodeGroup) Bootstrapper {
switch ng.AMIFamily {
case api.NodeImageFamilyAmazonLinux2:
return NewManagedAL2Bootstrapper(ng)
case api.NodeImageFamilyBottlerocket:
return NewManagedBottlerocketBootstrapper(clusterConfig, ng)
case api.NodeImageFamilyUbuntu1804, api.NodeImageFamilyUbuntu2004:
return NewUbuntuBootstrapper(clusterConfig, ng)
}
return nil
}
// GetClusterDNS returns the DNS address to use
func GetClusterDNS(clusterConfig *api.ClusterConfig) (string, error) {
networkConfig := clusterConfig.Status.KubernetesNetworkConfig
if networkConfig == nil {
return "", nil
}
ip, _, err := net.ParseCIDR(networkConfig.ServiceIPv4CIDR)
if err != nil {
return "", errors.Wrapf(err, "unexpected error parsing kubernetesNetworkConfig.serviceIPv4CIDR: %q", networkConfig.ServiceIPv4CIDR)
}
ip = ip.To4()
ip[net.IPv4len-1] = 10
return ip.String(), nil
}
func linuxConfig(clusterConfig *api.ClusterConfig, bootScriptName, bootScriptContent string, np api.NodePool, scripts ...script) (string, error) {
config := cloudconfig.New()
ng := np.BaseNodeGroup()
for _, command := range ng.PreBootstrapCommands {
config.AddShellCommand(command)
}
var files []cloudconfig.File
if len(scripts) == 0 {
scripts = []script{}
}
if ng.OverrideBootstrapCommand != nil {
config.AddShellCommand(*ng.OverrideBootstrapCommand)
} else {
scripts = append(scripts, script{name: bootScriptName, contents: bootScriptContent})
}
scripts = append(scripts, script{name: commonLinuxBootScript, contents: assets.BootstrapHelperSh})
var kubeletExtraConf *api.InlineDocument
if unmanaged, ok := np.(*api.NodeGroup); ok {
kubeletExtraConf = unmanaged.KubeletExtraConfig
}
kubeletConf, err := makeKubeletExtraConf(kubeletExtraConf)
if err != nil {
return "", err
}
files = append(files, kubeletConf)
envFile := makeBootstrapEnv(clusterConfig, np)
files = append(files, envFile)
if err := addFilesAndScripts(config, files, scripts); err != nil {
return "", err
}
body, err := config.Encode()
if err != nil {
return "", errors.Wrap(err, "encoding user data")
}
return body, nil
}
func makeKubeletExtraConf(kubeletExtraConf *api.InlineDocument) (cloudconfig.File, error) {
if kubeletExtraConf == nil {
kubeletExtraConf = &api.InlineDocument{}
}
data, err := json.Marshal(kubeletExtraConf)
if err != nil {
return cloudconfig.File{}, err
}
// validate that data can be decoded as legit KubeletConfiguration
if err := json.Unmarshal(data, &kubeletapi.KubeletConfiguration{}); err != nil {
return cloudconfig.File{}, err
}
return cloudconfig.File{
Path: configDir + extraKubeConfFile,
Content: string(data),
}, nil
}
func makeBootstrapEnv(clusterConfig *api.ClusterConfig, np api.NodePool) cloudconfig.File {
ng := np.BaseNodeGroup()
variables := map[string]string{
"CLUSTER_NAME": clusterConfig.Metadata.Name,
"API_SERVER_URL": clusterConfig.Status.Endpoint,
"B64_CLUSTER_CA": base64.StdEncoding.EncodeToString(clusterConfig.Status.CertificateAuthorityData),
"NODE_LABELS": formatLabels(ng.Labels),
"NODE_TAINTS": utils.FormatTaints(np.NGTaints()),
}
if ng.MaxPodsPerNode > 0 {
variables["MAX_PODS"] = strconv.Itoa(ng.MaxPodsPerNode)
}
if unmanaged, ok := np.(*api.NodeGroup); ok && unmanaged.ClusterDNS != "" {
variables["CLUSTER_DNS"] = unmanaged.ClusterDNS
}
if unmanaged, ok := np.(*api.NodeGroup); ok && ng.AMIFamily == api.NodeImageFamilyAmazonLinux2 {
variables["CONTAINER_RUNTIME"] = unmanaged.GetContainerRuntime()
}
return cloudconfig.File{
Path: configDir + envFile,
Content: makeKeyValues(variables, "\n"),
}
}
func makeKeyValues(kv map[string]string, separator string) string {
var params []string
for k, v := range kv {
params = append(params, fmt.Sprintf("%s=%s", k, v))
}
return strings.Join(params, separator)
}
func formatLabels(labels map[string]string) string {
return makeKeyValues(labels, ",")
}
type script struct {
name string
contents string
}
func addFilesAndScripts(config *cloudconfig.CloudConfig, files []cloudconfig.File, scripts []script) error {
for _, file := range files {
config.AddFile(file)
}
for _, s := range scripts {
config.RunScript(s.name, s.contents)
}
return nil
}