295 lines
9 KiB
Go
295 lines
9 KiB
Go
/*
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Copyright 2016 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 master
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import (
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"fmt"
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"net"
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"path"
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kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
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"k8s.io/kubernetes/cmd/kubeadm/app/images"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/resource"
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"k8s.io/kubernetes/pkg/api/v1"
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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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"k8s.io/kubernetes/pkg/registry/core/service/ipallocator"
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"k8s.io/kubernetes/pkg/util/intstr"
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)
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func createKubeProxyPodSpec(cfg *kubeadmapi.MasterConfiguration) v1.PodSpec {
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privilegedTrue := true
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return v1.PodSpec{
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HostNetwork: true,
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SecurityContext: &v1.PodSecurityContext{},
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Containers: []v1.Container{{
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Name: kubeProxy,
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Image: images.GetCoreImage(images.KubeProxyImage, cfg, kubeadmapi.GlobalEnvParams.HyperkubeImage),
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Command: append(getProxyCommand(cfg), "--kubeconfig=/run/kubeconfig"),
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SecurityContext: &v1.SecurityContext{Privileged: &privilegedTrue},
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VolumeMounts: []v1.VolumeMount{
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{
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Name: "dbus",
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MountPath: "/var/run/dbus",
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ReadOnly: false,
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},
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{
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// TODO there are handful of clever options to get around this, but it's
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// easier to just mount kubelet's config here; we should probably just
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// make sure that proxy reads the token and CA cert from /run/secrets
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// and accepts `--master` at the same time
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//
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// clever options include:
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// - do CSR dance and create kubeconfig and mount it as a secret
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// - create a service account with a second secret encoding kubeconfig
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// - use init container to convert known information to kubeconfig
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// - ...whatever
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Name: "kubeconfig",
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MountPath: "/run/kubeconfig",
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ReadOnly: false,
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},
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},
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}},
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Volumes: []v1.Volume{
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{
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Name: "kubeconfig",
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VolumeSource: v1.VolumeSource{
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HostPath: &v1.HostPathVolumeSource{Path: path.Join(kubeadmapi.GlobalEnvParams.KubernetesDir, "kubelet.conf")},
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},
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},
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{
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Name: "dbus",
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VolumeSource: v1.VolumeSource{
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HostPath: &v1.HostPathVolumeSource{Path: "/var/run/dbus"},
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},
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},
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},
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}
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}
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func createKubeDNSPodSpec(cfg *kubeadmapi.MasterConfiguration) v1.PodSpec {
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kubeDNSPort := int32(10053)
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dnsmasqPort := int32(53)
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return v1.PodSpec{
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Containers: []v1.Container{
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// DNS server
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{
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Name: "kubedns",
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Image: images.GetAddonImage(images.KubeDNSImage),
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Resources: v1.ResourceRequirements{
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Limits: v1.ResourceList{
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("170Mi"),
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},
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Requests: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("100m"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("70Mi"),
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},
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},
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LivenessProbe: &v1.Probe{
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Handler: v1.Handler{
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HTTPGet: &v1.HTTPGetAction{
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Path: "/healthcheck/kubedns",
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Port: intstr.FromInt(10054),
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Scheme: v1.URISchemeHTTP,
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},
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},
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InitialDelaySeconds: 60,
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TimeoutSeconds: 5,
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SuccessThreshold: 1,
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FailureThreshold: 5,
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},
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// # we poll on pod startup for the Kubernetes master service and
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// # only setup the /readiness HTTP server once that's available.
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ReadinessProbe: &v1.Probe{
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Handler: v1.Handler{
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HTTPGet: &v1.HTTPGetAction{
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Path: "/readiness",
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Port: intstr.FromInt(8081),
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Scheme: v1.URISchemeHTTP,
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},
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},
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InitialDelaySeconds: 3,
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TimeoutSeconds: 5,
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},
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Args: []string{
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fmt.Sprintf("--domain=%s", cfg.Networking.DNSDomain),
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fmt.Sprintf("--dns-port=%d", kubeDNSPort),
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"--config-map=kube-dns",
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"--v=2",
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},
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Env: []v1.EnvVar{
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{
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Name: "PROMETHEUS_PORT",
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Value: "10055",
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},
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},
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Ports: []v1.ContainerPort{
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{
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ContainerPort: kubeDNSPort,
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Name: "dns-local",
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Protocol: v1.ProtocolUDP,
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},
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{
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ContainerPort: kubeDNSPort,
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Name: "dns-tcp-local",
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Protocol: v1.ProtocolTCP,
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},
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{
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ContainerPort: 10055,
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Name: "metrics",
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Protocol: v1.ProtocolTCP,
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},
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},
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},
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// dnsmasq
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{
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Name: "dnsmasq",
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Image: images.GetAddonImage(images.KubeDNSmasqImage),
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LivenessProbe: &v1.Probe{
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Handler: v1.Handler{
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HTTPGet: &v1.HTTPGetAction{
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Path: "/healthcheck/dnsmasq",
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Port: intstr.FromInt(10054),
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Scheme: v1.URISchemeHTTP,
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},
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},
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InitialDelaySeconds: 60,
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TimeoutSeconds: 5,
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SuccessThreshold: 1,
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FailureThreshold: 5,
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},
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Args: []string{
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"--cache-size=1000",
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"--no-resolv",
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fmt.Sprintf("--server=127.0.0.1#%d", kubeDNSPort),
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"--log-facility=-",
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},
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Ports: []v1.ContainerPort{
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{
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ContainerPort: dnsmasqPort,
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Name: "dns",
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Protocol: v1.ProtocolUDP,
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},
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{
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ContainerPort: dnsmasqPort,
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Name: "dns-tcp",
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Protocol: v1.ProtocolTCP,
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},
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},
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Resources: v1.ResourceRequirements{
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Requests: v1.ResourceList{
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("150m"),
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("10Mi"),
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},
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},
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},
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{
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Name: "sidecar",
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Image: images.GetAddonImage(images.KubeDNSSidecarImage),
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LivenessProbe: &v1.Probe{
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Handler: v1.Handler{
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HTTPGet: &v1.HTTPGetAction{
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Path: "/metrics",
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Port: intstr.FromInt(10054),
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Scheme: v1.URISchemeHTTP,
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},
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},
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InitialDelaySeconds: 60,
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TimeoutSeconds: 5,
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SuccessThreshold: 1,
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FailureThreshold: 5,
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},
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Args: []string{
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"--v=2",
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"--logtostderr",
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fmt.Sprintf("--probe=kubedns,127.0.0.1:10053,kubernetes.default.svc.%s,5,A", cfg.Networking.DNSDomain),
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fmt.Sprintf("--probe=dnsmasq,127.0.0.1:53,kubernetes.default.svc.%s,5,A", cfg.Networking.DNSDomain),
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},
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Ports: []v1.ContainerPort{
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{
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ContainerPort: 10054,
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Name: "metrics",
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Protocol: v1.ProtocolTCP,
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},
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},
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Resources: v1.ResourceRequirements{
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Requests: v1.ResourceList{
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v1.ResourceName(v1.ResourceMemory): resource.MustParse("20Mi"),
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v1.ResourceName(v1.ResourceCPU): resource.MustParse("10m"),
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},
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},
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},
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},
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DNSPolicy: v1.DNSDefault,
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}
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}
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func createKubeDNSServiceSpec(cfg *kubeadmapi.MasterConfiguration) (*v1.ServiceSpec, error) {
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_, n, err := net.ParseCIDR(cfg.Networking.ServiceSubnet)
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if err != nil {
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return nil, fmt.Errorf("could not parse %q: %v", cfg.Networking.ServiceSubnet, err)
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}
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ip, err := ipallocator.GetIndexedIP(n, 10)
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if err != nil {
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return nil, fmt.Errorf("unable to allocate IP address for kube-dns addon from the given CIDR %q: [%v]", cfg.Networking.ServiceSubnet, err)
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}
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return &v1.ServiceSpec{
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Selector: map[string]string{"name": "kube-dns"},
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Ports: []v1.ServicePort{
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{Name: "dns", Port: 53, Protocol: v1.ProtocolUDP},
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{Name: "dns-tcp", Port: 53, Protocol: v1.ProtocolTCP},
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},
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ClusterIP: ip.String(),
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}, nil
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}
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func CreateEssentialAddons(cfg *kubeadmapi.MasterConfiguration, client *clientset.Clientset) error {
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kubeProxyDaemonSet := NewDaemonSet(kubeProxy, createKubeProxyPodSpec(cfg))
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SetMasterTaintTolerations(&kubeProxyDaemonSet.Spec.Template.ObjectMeta)
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SetNodeAffinity(&kubeProxyDaemonSet.Spec.Template.ObjectMeta, NativeArchitectureNodeAffinity())
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if _, err := client.Extensions().DaemonSets(api.NamespaceSystem).Create(kubeProxyDaemonSet); err != nil {
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return fmt.Errorf("failed creating essential kube-proxy addon [%v]", err)
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}
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fmt.Println("[addons] Created essential addon: kube-proxy")
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kubeDNSDeployment := NewDeployment("kube-dns", 1, createKubeDNSPodSpec(cfg))
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SetMasterTaintTolerations(&kubeDNSDeployment.Spec.Template.ObjectMeta)
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SetNodeAffinity(&kubeDNSDeployment.Spec.Template.ObjectMeta, NativeArchitectureNodeAffinity())
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if _, err := client.Extensions().Deployments(api.NamespaceSystem).Create(kubeDNSDeployment); err != nil {
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return fmt.Errorf("failed creating essential kube-dns addon [%v]", err)
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}
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kubeDNSServiceSpec, err := createKubeDNSServiceSpec(cfg)
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if err != nil {
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return fmt.Errorf("failed creating essential kube-dns addon [%v]", err)
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}
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kubeDNSService := NewService("kube-dns", *kubeDNSServiceSpec)
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kubeDNSService.ObjectMeta.Labels["kubernetes.io/name"] = "KubeDNS"
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if _, err := client.Services(api.NamespaceSystem).Create(kubeDNSService); err != nil {
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return fmt.Errorf("failed creating essential kube-dns addon [%v]", err)
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}
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fmt.Println("[addons] Created essential addon: kube-dns")
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return nil
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}
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