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config.go
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config.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 kubeadm
import (
"bytes"
"text/template"
"github.com/gosoon/glog"
"github.com/pkg/errors"
"k8s.io/apimachinery/pkg/util/version"
)
// ConfigData is supplied to the kubeadm config template, with values populated
// by the cluster package
type ConfigData struct {
ClusterName string
KubernetesVersion string
// The ControlPlaneEndpoint, that is the address of the external loadbalancer
// if defined or the bootstrap node
ControlPlaneEndpoint string
// The Local API Server port
APIBindPort int
// The API server external listen IP (which we will port forward)
APIServerAddress string
// ControlPlane flag specifies the node belongs to the control plane
ControlPlane bool
// The main IP address of the node
NodeAddress string
// The Token for TLS bootstrap
Token string
// The subnet used for pods
PodSubnet string
// The subnet used for services
ServiceSubnet string
// IPv4 values take precedence over IPv6 by default, if true set IPv6 default values
IPv6 bool
// DerivedConfigData is populated by Derive()
// These auto-generated fields are available to Config templates,
// but not meant to be set by hand
//DerivedConfigData
}
// See docs for these APIs at:
// https://godoc.org/k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm#pkg-subdirectories
// EG:
// https://godoc.org/k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta1
// ConfigTemplateAlphaV2 is the kubadm config template for v1alpha2
//
// NOTE: this is the v1.11 version of this API, breaking changes occurred
// in v1.12 vs v1.11, but v1.12 also has v1alpha3 which we use instead
//
// see: https://github.com/kubernetes/kubernetes/tree/release-1.11/cmd/kubeadm/app/apis/kubeadm/v1alpha2
const ConfigTemplateAlphaV2 = `# config generated by kind
{{if .ControlPlane}}# config for the control plane node
apiVersion: kubeadm.k8s.io/v1alpha2
kind: MasterConfiguration
kubernetesVersion: {{.KubernetesVersion}}
clusterName: "{{.ClusterName}}"
# we use a well know token for TLS bootstrap
bootstrapTokens:
- token: "{{ .Token }}"
controlPlaneEndpoint: "{{ .ControlPlaneEndpoint }}"
# we use a well know port for making the API server discoverable inside docker network.
# from the host machine such port will be accessible via a random local port instead.
api:
advertiseAddress: "{{ .NodeAddress }}"
bindPort: {{.APIBindPort}}
# we need nsswitch.conf so we use /etc/hosts
# https://github.com/kubernetes/kubernetes/issues/69195
apiServerExtraVolumes:
- name: nsswitch
mountPath: /etc/nsswitch.conf
hostPath: /etc/nsswitch.conf
writeable: false
pathType: FileOrCreate
# on docker for mac we have to expose the api server via port forward,
# so we need to ensure the cert is valid for localhost so we can talk
# to the cluster after rewriting the kubeconfig to point to localhost
apiServerCertSANs: [localhost, "{{.APIServerAddress}}"]
kubeletConfiguration:
baseConfig:
# configure ipv6 addresses in IPv6 mode
{{ if .IPv6 -}}
address: "::"
healthzBindAddress: "::"
{{- end }}
# disable disk resource management by default
# kubelet will see the host disk that the inner container runtime
# is ultimately backed by and attempt to recover disk space.
# we don't want that.
imageGCHighThresholdPercent: 100
evictionHard:
nodefs.available: "0%"
nodefs.inodesFree: "0%"
imagefs.available: "0%"
controllerManagerExtraArgs:
enable-hostpath-provisioner: "true"
nodeRegistration:
criSocket: "/var/run/dockershim.sock"
kubeletExtraArgs:
fail-swap-on: "false"
node-ip: "{{ .NodeAddress }}"
networking:
podSubnet: "{{ .PodSubnet }}"
{{else}}# config for this worker node
apiVersion: kubeadm.k8s.io/v1alpha2
kind: NodeConfiguration
clusterName: "{{.ClusterName}}"
discoveryTokenAPIServers: ["{{ .ControlPlaneEndpoint }}"]
token: "{{ .Token }}"
discoveryTokenUnsafeSkipCAVerification: true
nodeRegistration:
criSocket: "/var/run/dockershim.sock"
kubeletExtraArgs:
fail-swap-on: "false"
node-ip: "{{ .NodeAddress }}"
{{end}}
`
// ConfigTemplateAlphaV3 is the kubadm config template for API version v1alpha3
const ConfigTemplateAlphaV3 = `# config generated by kind
apiVersion: kubeadm.k8s.io/v1alpha3
kind: ClusterConfiguration
kubernetesVersion: {{.KubernetesVersion}}
clusterName: "{{.ClusterName}}"
controlPlaneEndpoint: "{{ .ControlPlaneEndpoint }}"
networking:
podSubnet: "{{ .PodSubnet }}"
serviceSubnet: "{{ .ServiceSubnet }}"
# we need nsswitch.conf so we use /etc/hosts
# https://github.com/kubernetes/kubernetes/issues/69195
apiServerExtraVolumes:
- name: nsswitch
mountPath: /etc/nsswitch.conf
hostPath: /etc/nsswitch.conf
writeable: false
pathType: FileOrCreate
# on docker for mac we have to expose the api server via port forward,
# so we need to ensure the cert is valid for localhost so we can talk
# to the cluster after rewriting the kubeconfig to point to localhost
apiServerCertSANs: [localhost, "{{.APIServerAddress}}"]
controllerManagerExtraArgs:
enable-hostpath-provisioner: "true"
networking:
podSubnet: "{{ .PodSubnet }}"
---
apiVersion: kubeadm.k8s.io/v1alpha3
kind: InitConfiguration
# we use a well know token for TLS bootstrap
bootstrapTokens:
- token: "{{ .Token }}"
# we use a well know port for making the API server discoverable inside docker network.
# from the host machine such port will be accessible via a random local port instead.
apiEndpoint:
advertiseAddress: "{{ .NodeAddress }}"
bindPort: {{.APIBindPort}}
nodeRegistration:
criSocket: "/var/run/dockershim.sock"
kubeletExtraArgs:
fail-swap-on: "false"
node-ip: "{{ .NodeAddress }}"
---
# no-op entry that exists solely so it can be patched
apiVersion: kubeadm.k8s.io/v1alpha3
kind: JoinConfiguration
discoveryTokenAPIServers: ["{{ .ControlPlaneEndpoint }}"]
token: "{{ .Token }}"
discoveryTokenUnsafeSkipCAVerification: true
controlPlane: {{ .ControlPlane }}
{{ if .ControlPlane -}}
apiEndpoint:
advertiseAddress: "{{ .NodeAddress }}"
bindPort: {{.APIBindPort}}
{{- end }}
nodeRegistration:
criSocket: "/var/run/dockershim.sock"
kubeletExtraArgs:
fail-swap-on: "false"
node-ip: "{{ .NodeAddress }}"
---
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
# configure ipv6 addresses in IPv6 mode
{{ if .IPv6 -}}
address: "::"
healthzBindAddress: "::"
{{- end }}
# disable disk resource management by default
# kubelet will see the host disk that the inner container runtime
# is ultimately backed by and attempt to recover disk space. we don't want that.
imageGCHighThresholdPercent: 100
evictionHard:
nodefs.available: "0%"
nodefs.inodesFree: "0%"
imagefs.available: "0%"
---
# no-op entry that exists solely so it can be patched
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
`
// ConfigTemplateBetaV1 is the kubadm config template for API version v1beta1
const ConfigTemplateBetaV1 = `# config generated by kind
apiVersion: kubeadm.k8s.io/v1beta1
kind: ClusterConfiguration
kubernetesVersion: {{.KubernetesVersion}}
clusterName: "{{.ClusterName}}"
controlPlaneEndpoint: "{{ .ControlPlaneEndpoint }}"
# on docker for mac we have to expose the api server via port forward,
# so we need to ensure the cert is valid for localhost so we can talk
# to the cluster after rewriting the kubeconfig to point to localhost
apiServer:
certSANs: [localhost, "{{.APIServerAddress}}"]
controllerManager:
extraArgs:
enable-hostpath-provisioner: "true"
# configure ipv6 default addresses for IPv6 clusters
{{ if .IPv6 -}}
bind-address: "::"
{{- end }}
scheduler:
extraArgs:
# configure ipv6 default addresses for IPv6 clusters
{{ if .IPv6 -}}
address: "::"
bind-address: "::1"
{{- end }}
networking:
podSubnet: "{{ .PodSubnet }}"
serviceSubnet: "{{ .ServiceSubnet }}"
---
apiVersion: kubeadm.k8s.io/v1beta1
kind: InitConfiguration
# we use a well know token for TLS bootstrap
bootstrapTokens:
- token: "{{ .Token }}"
# we use a well know port for making the API server discoverable inside docker network.
# from the host machine such port will be accessible via a random local port instead.
localAPIEndpoint:
advertiseAddress: "{{ .NodeAddress }}"
bindPort: {{.APIBindPort}}
nodeRegistration:
criSocket: "/var/run/dockershim.sock"
kubeletExtraArgs:
fail-swap-on: "false"
node-ip: "{{ .NodeAddress }}"
---
# no-op entry that exists solely so it can be patched
apiVersion: kubeadm.k8s.io/v1beta1
kind: JoinConfiguration
{{ if .ControlPlane -}}
controlPlane:
localAPIEndpoint:
advertiseAddress: "{{ .NodeAddress }}"
bindPort: {{.APIBindPort}}
{{- end }}
nodeRegistration:
criSocket: "/var/run/dockershim.sock"
kubeletExtraArgs:
fail-swap-on: "false"
node-ip: "{{ .NodeAddress }}"
discovery:
bootstrapToken:
apiServerEndpoint: "{{ .ControlPlaneEndpoint }}"
token: "{{ .Token }}"
unsafeSkipCAVerification: true
---
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
# configure ipv6 addresses in IPv6 mode
{{ if .IPv6 -}}
address: "::"
healthzBindAddress: "::"
{{- end }}
# disable disk resource management by default
# kubelet will see the host disk that the inner container runtime
# is ultimately backed by and attempt to recover disk space. we don't want that.
imageGCHighThresholdPercent: 100
evictionHard:
nodefs.available: "0%"
nodefs.inodesFree: "0%"
imagefs.available: "0%"
---
# no-op entry that exists solely so it can be patched
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
`
// ConfigTemplateBetaV2 is the kubadm config template for API version v1beta2
const ConfigTemplateBetaV2 = `# config generated by kind
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
kubernetesVersion: {{.KubernetesVersion}}
clusterName: "{{.ClusterName}}"
controlPlaneEndpoint: "{{ .ControlPlaneEndpoint }}"
# on docker for mac we have to expose the api server via port forward,
# so we need to ensure the cert is valid for localhost so we can talk
# to the cluster after rewriting the kubeconfig to point to localhost
apiServer:
certSANs: [localhost, "{{.APIServerAddress}}"]
controllerManager:
extraArgs:
enable-hostpath-provisioner: "true"
# configure ipv6 default addresses for IPv6 clusters
{{ if .IPv6 -}}
bind-address: "::"
{{- end }}
scheduler:
extraArgs:
# configure ipv6 default addresses for IPv6 clusters
{{ if .IPv6 -}}
address: "::"
bind-address: "::1"
{{- end }}
networking:
podSubnet: "{{ .PodSubnet }}"
serviceSubnet: "{{ .ServiceSubnet }}"
---
apiVersion: kubeadm.k8s.io/v1beta2
kind: InitConfiguration
# we use a well know token for TLS bootstrap
bootstrapTokens:
- token: "{{ .Token }}"
# we use a well know port for making the API server discoverable inside docker network.
# from the host machine such port will be accessible via a random local port instead.
localAPIEndpoint:
advertiseAddress: "{{ .NodeAddress }}"
bindPort: {{.APIBindPort}}
nodeRegistration:
criSocket: "/var/run/dockershim.sock"
kubeletExtraArgs:
fail-swap-on: "false"
node-ip: "{{ .NodeAddress }}"
---
# no-op entry that exists solely so it can be patched
apiVersion: kubeadm.k8s.io/v1beta2
kind: JoinConfiguration
{{ if .ControlPlane -}}
controlPlane:
localAPIEndpoint:
advertiseAddress: "{{ .NodeAddress }}"
bindPort: {{.APIBindPort}}
{{- end }}
nodeRegistration:
criSocket: "/var/run/dockershim.sock"
kubeletExtraArgs:
fail-swap-on: "false"
node-ip: "{{ .NodeAddress }}"
discovery:
bootstrapToken:
apiServerEndpoint: "{{ .ControlPlaneEndpoint }}"
token: "{{ .Token }}"
unsafeSkipCAVerification: true
---
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
# configure ipv6 addresses in IPv6 mode
{{ if .IPv6 -}}
address: "::"
healthzBindAddress: "::"
{{- end }}
# disable disk resource management by default
# kubelet will see the host disk that the inner container runtime
# is ultimately backed by and attempt to recover disk space. we don't want that.
imageGCHighThresholdPercent: 100
evictionHard:
nodefs.available: "0%"
nodefs.inodesFree: "0%"
imagefs.available: "0%"
---
# no-op entry that exists solely so it can be patched
apiVersion: kubeproxy.config.k8s.io/v1alpha1
kind: KubeProxyConfiguration
`
// Config returns a kubeadm config generated from config data, in particular
// the kubernetes version
func Config(data ConfigData) (config string, err error) {
glog.Infof("Configuration Input data: %v", data)
ver, err := version.ParseGeneric(data.KubernetesVersion)
if err != nil {
return "", err
}
// assume the latest API version, then fallback if the k8s version is too low
templateSource := ConfigTemplateBetaV2
if ver.LessThan(version.MustParseSemantic("v1.12.0")) {
templateSource = ConfigTemplateAlphaV2
} else if ver.LessThan(version.MustParseSemantic("v1.13.0")) {
templateSource = ConfigTemplateAlphaV3
} else if ver.LessThan(version.MustParseSemantic("v1.15.0")) {
templateSource = ConfigTemplateBetaV1
}
t, err := template.New("kubeadm-config").Parse(templateSource)
if err != nil {
return "", errors.Wrap(err, "failed to parse config template")
}
// execute the template
var buff bytes.Buffer
err = t.Execute(&buff, data)
if err != nil {
return "", errors.Wrap(err, "error executing config template")
}
glog.Infof("Configuration generated:\n %v", buff.String())
return buff.String(), nil
}