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prerequisites.go
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prerequisites.go
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/*
Copyright 2019 The KubeOne Authors.
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 installation
import (
"fmt"
"github.com/pkg/errors"
"github.com/kubermatic/kubeone/pkg/config"
"github.com/kubermatic/kubeone/pkg/ssh"
"github.com/kubermatic/kubeone/pkg/util"
)
const dockerVersion = "18.09.2"
func installPrerequisites(ctx *util.Context) error {
ctx.Logger.Infoln("Installing prerequisites…")
generateConfigurationFiles(ctx)
return ctx.RunTaskOnAllNodes(installPrerequisitesOnNode, true)
}
func generateConfigurationFiles(ctx *util.Context) {
ctx.Configuration.AddFile("cfg/cloud-config", ctx.Cluster.Provider.CloudConfig)
}
func installPrerequisitesOnNode(ctx *util.Context, node *config.HostConfig, conn ssh.Connection) error {
ctx.Logger.Infoln("Determine operating system…")
os, err := determineOS(ctx)
if err != nil {
return errors.Wrap(err, "failed to determine operating system")
}
node.OperatingSystem = os
ctx.Logger.Infoln("Determine hostname…")
hostname, err := determineHostname(ctx, node)
if err != nil {
return errors.Wrap(err, "failed to determine hostname")
}
ctx.Logger.Infoln("Creating environment file…")
err = createEnvironmentFile(ctx)
if err != nil {
return errors.Wrap(err, "failed to create environment file")
}
node.Hostname = hostname
logger := ctx.Logger.WithField("os", os)
logger.Infoln("Installing kubeadm…")
err = installKubeadm(ctx, node)
if err != nil {
return errors.Wrap(err, "failed to install kubeadm")
}
err = configureDockerDaemonProxy(ctx)
if err != nil {
return errors.Wrap(err, "failed to configure proxy for docker daemon")
}
logger.Infoln("Deploying configuration files…")
err = deployConfigurationFiles(ctx)
if err != nil {
return errors.Wrap(err, "failed to upload configuration files")
}
return nil
}
func determineOS(ctx *util.Context) (string, error) {
osID, _, err := ctx.Runner.Run("source /etc/os-release && echo -n $ID", nil)
return osID, err
}
func determineHostname(ctx *util.Context, _ *config.HostConfig) (string, error) {
stdout, _, err := ctx.Runner.Run("hostname -f", nil)
return stdout, err
}
func createEnvironmentFile(ctx *util.Context) error {
_, _, err := ctx.Runner.Run(environmentFileCommand, util.TemplateVariables{
"HTTP_PROXY": ctx.Cluster.Proxy.HTTPProxy,
"HTTPS_PROXY": ctx.Cluster.Proxy.HTTPSProxy,
"NO_PROXY": ctx.Cluster.Proxy.NoProxy,
})
return err
}
const environmentFileCommand = `
sudo mkdir -p /etc/kubeone
cat <<EOF |sudo tee /etc/kubeone/proxy-env
{{ if .HTTP_PROXY -}}
HTTP_PROXY="{{ .HTTP_PROXY }}"
http_proxy="{{ .HTTP_PROXY }}"
{{ end }}
{{- if .HTTPS_PROXY -}}
HTTPS_PROXY="{{ .HTTPS_PROXY }}"
https_proxy="{{ .HTTPS_PROXY }}"
{{ end }}
{{- if .NO_PROXY -}}
NO_PROXY="{{ .NO_PROXY }}"
no_proxy="{{ .NO_PROXY }}"
{{ end }}
EOF
`
func installKubeadm(ctx *util.Context, node *config.HostConfig) error {
var err error
switch node.OperatingSystem {
case "ubuntu", "debian":
err = installKubeadmDebian(ctx)
case "coreos":
err = installKubeadmCoreOS(ctx)
case "centos":
err = installKubeadmCentOS(ctx)
default:
err = errors.Errorf("'%s' is not a supported operating system", node.OperatingSystem)
}
return err
}
func installKubeadmDebian(ctx *util.Context) error {
_, _, err := ctx.Runner.Run(kubeadmDebianCommand, util.TemplateVariables{
"KUBERNETES_VERSION": ctx.Cluster.Versions.Kubernetes,
"DOCKER_VERSION": dockerVersion,
"CNI_VERSION": ctx.Cluster.Versions.KubernetesCNIVersion(),
})
return errors.WithStack(err)
}
const kubeadmDebianCommand = `
sudo swapoff -a
sudo sed -i '/.*swap.*/d' /etc/fstab
source /etc/os-release
source /etc/kubeone/proxy-env
# Short-Circuit the installation if it was arleady executed
if type docker &>/dev/null && type kubelet &>/dev/null; then exit 0; fi
sudo mkdir -p /etc/docker
cat <<EOF |sudo tee /etc/docker/daemon.json
{"storage-driver": "overlay2"}
EOF
sudo apt-get update
sudo apt-get install -y --no-install-recommends \
apt-transport-https \
ca-certificates \
curl \
htop \
lsb-release \
rsync \
tree
curl -fsSL https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
curl -fsSL https://download.docker.com/linux/${ID}/gpg | sudo apt-key add -
echo "deb [arch=amd64] https://download.docker.com/linux/${ID} $(lsb_release -sc) stable" | \
sudo tee /etc/apt/sources.list.d/docker.list
# You'd think that kubernetes-$(lsb_release -sc) belongs there instead, but the debian repo
# contains neither kubeadm nor kubelet, and the docs themselves suggest using xenial repo.
echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" | \
sudo tee /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update
docker_ver=$(apt-cache madison docker-ce | grep "{{ .DOCKER_VERSION }}" | head -1 | awk '{print $3}')
kube_ver=$(apt-cache madison kubelet | grep "{{ .KUBERNETES_VERSION }}" | head -1 | awk '{print $3}')
cni_ver=$(apt-cache madison kubernetes-cni | grep "{{ .CNI_VERSION }}" | head -1 | awk '{print $3}')
sudo apt-mark unhold docker-ce kubelet kubeadm kubectl kubernetes-cni
sudo apt-get install -y --no-install-recommends \
docker-ce=${docker_ver} \
kubeadm=${kube_ver} \
kubectl=${kube_ver} \
kubelet=${kube_ver} \
kubernetes-cni=${cni_ver}
sudo apt-mark hold docker-ce kubelet kubeadm kubectl kubernetes-cni
`
const kubeadmCentOSCommand = `
sudo swapoff -a
sudo sed -i '/.*swap.*/d' /etc/fstab
sudo setenforce 0
sudo sed -i s/SELINUX=enforcing/SELINUX=permissive/g /etc/sysconfig/selinux
source /etc/kubeone/proxy-env
# Short-Circuit the installation if it was arleady executed
if type docker &>/dev/null && type kubelet &>/dev/null; then exit 0; fi
cat <<EOF |sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sudo sysctl --system
cat <<EOF |sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
exclude=kube*
EOF
sudo yum install -y --disableexcludes=kubernetes \
docker kubelet-{{ .KUBERNETES_VERSION }}-0\
kubeadm-{{ .KUBERNETES_VERSION }}-0 \
kubectl-{{ .KUBERNETES_VERSION }}-0 \
kubernetes-cni-{{ .CNI_VERSION }}-0
sudo systemctl enable --now docker
`
func installKubeadmCentOS(ctx *util.Context) error {
_, _, err := ctx.Runner.Run(kubeadmCentOSCommand, util.TemplateVariables{
"KUBERNETES_VERSION": ctx.Cluster.Versions.Kubernetes,
"CNI_VERSION": ctx.Cluster.Versions.KubernetesCNIVersion(),
})
return err
}
func installKubeadmCoreOS(ctx *util.Context) error {
_, _, err := ctx.Runner.Run(kubeadmCoreOSCommand, util.TemplateVariables{
"KUBERNETES_VERSION": ctx.Cluster.Versions.Kubernetes,
"CNI_VERSION": fmt.Sprintf("v%s", ctx.Cluster.Versions.KubernetesCNIVersion()),
})
return err
}
const kubeadmCoreOSCommand = `
source /etc/kubeone/proxy-env
sudo mkdir -p /opt/cni/bin /etc/kubernetes/pki /etc/kubernetes/manifests
curl -L "https://github.com/containernetworking/plugins/releases/download/{{ .CNI_VERSION }}/cni-plugins-amd64-{{ .CNI_VERSION }}.tgz" | \
sudo tar -C /opt/cni/bin -xz
RELEASE="v{{ .KUBERNETES_VERSION }}"
sudo mkdir -p /opt/bin
cd /opt/bin
sudo curl -L --remote-name-all \
https://storage.googleapis.com/kubernetes-release/release/${RELEASE}/bin/linux/amd64/{kubeadm,kubelet,kubectl}
sudo chmod +x {kubeadm,kubelet,kubectl}
curl -sSL "https://raw.githubusercontent.com/kubernetes/kubernetes/${RELEASE}/build/debs/kubelet.service" | \
sed "s:/usr/bin:/opt/bin:g" | \
sudo tee /etc/systemd/system/kubelet.service
sudo mkdir -p /etc/systemd/system/kubelet.service.d
curl -sSL "https://raw.githubusercontent.com/kubernetes/kubernetes/${RELEASE}/build/debs/10-kubeadm.conf" | \
sed "s:/usr/bin:/opt/bin:g" | \
sudo tee /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
sudo systemctl daemon-reload
sudo systemctl enable docker.service kubelet.service
sudo systemctl start docker.service kubelet.service
`
func deployConfigurationFiles(ctx *util.Context) error {
err := ctx.Configuration.UploadTo(ctx.Runner.Conn, ctx.WorkDir)
if err != nil {
return errors.Wrap(err, "failed to upload")
}
// move config files to their permanent locations
_, _, err = ctx.Runner.Run(`
sudo mkdir -p /etc/systemd/system/kubelet.service.d/ /etc/kubernetes
sudo mv ./{{ .WORK_DIR }}/cfg/cloud-config /etc/kubernetes/cloud-config
sudo chown root:root /etc/kubernetes/cloud-config
sudo chmod 600 /etc/kubernetes/cloud-config
`, util.TemplateVariables{
"WORK_DIR": ctx.WorkDir,
})
return err
}
func configureDockerDaemonProxy(ctx *util.Context) error {
if ctx.Cluster.Proxy.HTTPProxy == "" && ctx.Cluster.Proxy.HTTPSProxy == "" && ctx.Cluster.Proxy.NoProxy == "" {
return nil
}
ctx.Logger.Infoln("Configuring docker proxy…")
_, _, err := ctx.Runner.Run(dockerDaemonProxy, util.TemplateVariables{})
return err
}
const dockerDaemonProxy = `
# Configure HTTP/HTTPS proxy for Docker
sudo mkdir -p /etc/systemd/system/docker.service.d
cat <<EOF |sudo tee /etc/systemd/system/docker.service.d/http-proxy.conf
[Service]
EnvironmentFile=/etc/kubeone/proxy-env
EOF
sudo systemctl daemon-reload
if sudo systemctl status docker &>/dev/null; then sudo systemctl restart docker; fi
`