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kube_create.go
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kube_create.go
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package cmd
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"path"
"strings"
"text/template"
"time"
"github.com/blang/semver"
"github.com/cenkalti/backoff"
"github.com/exoscale/egoscale"
"github.com/spf13/cobra"
"golang.org/x/crypto/ssh"
)
const (
// kubeDockerVersion is the version recommended by Kubernetes
kubeDockerVersion = "18.06"
// kubeCalicoVersion is the version of Calico installed
kubeCalicoVersion = "3.6"
// kubeDefaultTemplate is the template to install Kubernetes on.
kubeDefaultTemplate = defaultTemplate
)
// kubeCreateDebug represents a debug mode flag
var kubeCreateDebug bool
// kubeBootstrapStep represents a k8s instance bootstrap step
type kubeBootstrapStep struct {
name string
command string
}
type kubeCluster struct {
Address string
CalicoVersion string
DockerVersion string
IsOldCalico bool
KubernetesVersion string
Name string
}
// kubeBootstrapSteps represents a k8s instance bootstrap steps
var kubeBootstrapSteps = []kubeBootstrapStep{
{
name: "Instance system upgrade",
command: `\
set -xe
sudo -E DEBIAN_FRONTEND=noninteractive apt-get update
sudo -E DEBIAN_FRONTEND=noninteractive apt-get -o Dpkg::Options::="--force-confnew" upgrade -y
sudo -E DEBIAN_FRONTEND=noninteractive apt-get install -y \
apt-transport-https \
ca-certificates \
curl \
golang-cfssl \
software-properties-common
nohup sh -c 'sleep 5s ; sudo reboot' &
exit`,
},
{
name: "Docker Engine installation",
command: `\
set -xe
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository \
"deb [arch=amd64] https://download.docker.com/linux/ubuntu \
$(lsb_release -cs) \
stable"
sudo -E DEBIAN_FRONTEND=noninteractive apt-get update
PKG_VERSION=$(apt-cache madison docker-ce | awk '$3 ~ /{{ .DockerVersion }}/ { print $3 }' | sort -t : -k 2 -n | tail -n 1)
if [[ -z "${PKG_VERSION}" ]]; then
echo "error: unable to find docker-ce package for version {{ .DockerVersion }}" >&2
exit 1
fi
sudo -E DEBIAN_FRONTEND=noninteractive apt-get install -y docker-ce=${PKG_VERSION}
sudo apt-mark hold docker-ce
cat <<EOF > csr.json
{
"hosts": ["{{ .Address }}"],
"key": {"algo": "rsa", "size": 2048},
"names": [{"C": "CH", "L": "Lausanne", "O": "Exoscale", "OU": "exokube", "ST": ""}]
}
EOF
cfssl genkey -initca csr.json | cfssljson -bare ca
cfssl gencert \
-ca ca.pem \
-ca-key ca-key.pem \
-hostname {{ .Address }} csr.json | cfssljson -bare
cat <<EOF | sudo tee /etc/docker/daemon.json
{
"hosts": ["unix:///var/run/docker.sock", "tcp://0.0.0.0:2376"],
"tlsverify": true,
"tlscacert": "/etc/docker/ca.pem",
"tlscert": "/etc/docker/cert.pem",
"tlskey": "/etc/docker/key.pem",
"exec-opts": ["native.cgroupdriver=systemd"],
"storage-driver": "overlay2",
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
}
}
EOF
sudo mv ca.pem /etc/docker/ca.pem
sudo mv cert.pem /etc/docker/cert.pem
sudo mv cert-key.pem /etc/docker/key.pem
rm -f *.{csr,json,pem}
sudo mkdir /etc/systemd/system/docker.service.d/
cat <<EOF | sudo tee /etc/systemd/system/docker.service.d/override.conf
[Service]
ExecStart=
ExecStart=/usr/bin/dockerd
EOF
sudo systemctl daemon-reload \
&& sudo systemctl restart docker`,
},
{
name: "Kubernetes cluster node installation", command: `\
set -xe
curl -fsSL https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
cat <<EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF
sudo -E DEBIAN_FRONTEND=noninteractive apt-get update
PKG_VERSION=$(apt-cache madison kubelet | awk '$3 ~ /{{ .KubernetesVersion }}-/ { print $3 }' | sort -t "-" -k 2 -n | tail -n 1)
if [[ -z "${PKG_VERSION}" ]]; then
echo "error: unable to find kubelet package for version {{ .KubernetesVersion }}" >&2
exit 1
fi
sudo -E DEBIAN_FRONTEND=noninteractive apt-get install -y kubelet=${PKG_VERSION} \
kubeadm=${PKG_VERSION} \
kubectl=${PKG_VERSION}
sudo apt-mark hold kubelet kubeadm kubectl`,
}, {
name: "Kubernetes cluster node initialization",
command: `\
set -xe
sudo kubeadm init \
--pod-network-cidr=192.168.0.0/16 \
--kubernetes-version "{{ .KubernetesVersion }}"
sudo kubectl --kubeconfig=/etc/kubernetes/admin.conf taint nodes --all node-role.kubernetes.io/master-
{{ if not .IsOldCalico }}
sudo kubectl --kubeconfig=/etc/kubernetes/admin.conf apply \
-f https://docs.projectcalico.org/v{{ .CalicoVersion }}/getting-started/kubernetes/installation/hosted/kubernetes-datastore/calico-networking/1.7/calico.yaml
{{ else }}
sudo kubectl --kubeconfig=/etc/kubernetes/admin.conf apply \
-f https://docs.projectcalico.org/v{{ .CalicoVersion }}/getting-started/kubernetes/installation/hosted/etcd.yaml
sudo kubectl --kubeconfig=/etc/kubernetes/admin.conf apply \
-f https://docs.projectcalico.org/v{{ .CalicoVersion }}/getting-started/kubernetes/installation/hosted/calico.yaml
{{ end }}`,
},
}
// kubeCreateCmd represents the create command
var kubeCreateCmd = &cobra.Command{
Use: "create <cluster name>",
Short: "Create and configure a standalone Kubernetes cluster",
RunE: func(cmd *cobra.Command, args []string) error {
if len(args) < 1 {
return cmd.Usage()
}
clusterName := args[0]
vm, err := getVirtualMachineByNameOrID(clusterName)
if err != nil {
// If the cluster instance doesn't exist (expected case) we receive a well deserved
// "431 not found" error, but check if we got any other error just in case...
if csError, ok := err.(*egoscale.ErrorResponse); ok && csError.ErrorCode != egoscale.ParamError {
return err
}
}
if vm != nil {
return fmt.Errorf("cluster instance %q already exists", clusterName)
}
kubeCreateDebug, err := cmd.Flags().GetBool("debug")
if err != nil {
return err
}
requestedKubernetesVersion, err := cmd.Flags().GetString("version")
if err != nil {
return err
}
kubernetesVersion, err := fetchKubernetesVersion(requestedKubernetesVersion)
if err != nil {
return err
}
dockerVersion, err := cmd.Flags().GetString("docker-version")
if err != nil {
return nil
}
if dockerVersion == "" {
dockerVersion = kubeDockerVersion
}
calicoVersion, err := cmd.Flags().GetString("calico-version")
if err != nil {
return nil
}
if calicoVersion == "" {
calicoVersion = kubeCalicoVersion
}
sizeOpt, err := cmd.Flags().GetString("size")
if err != nil {
return err
}
size, err := getServiceOfferingByName(sizeOpt)
if err != nil {
return err
}
zone, err := getZoneIDByName(gCurrentAccount.DefaultZone)
if err != nil {
return err
}
sg, err := createExokubeSecurityGroup()
if err != nil {
return err
}
template, err := getTemplateByName(zone, kubeDefaultTemplate)
if err != nil {
return err
}
userName, ok := template.Details["username"]
if !ok {
return fmt.Errorf("cannot fetch username from template %q", defaultTemplate)
}
r, errs := createVM([]egoscale.DeployVirtualMachine{{
Name: clusterName,
ZoneID: zone,
ServiceOfferingID: size.ID,
TemplateID: template.ID,
RootDiskSize: 10,
SecurityGroupIDs: []egoscale.UUID{*sg.ID},
}})
if len(errs) > 0 {
return errs[0]
}
vm = &r[0]
if _, err := cs.Request(egoscale.CreateTags{
ResourceType: vm.ResourceType(),
ResourceIDs: []egoscale.UUID{*vm.ID},
Tags: []egoscale.ResourceTag{
{Key: "managedby", Value: "exokube"},
{Key: kubeTagKubernetes, Value: kubernetesVersion},
{Key: kubeTagDocker, Value: dockerVersion},
{Key: kubeTagCalico, Value: calicoVersion},
},
}); err != nil {
return fmt.Errorf("unable to tag cluster instance: %s", err)
}
if err := saveKubeData(clusterName, "instance", []byte(vm.ID.String())); err != nil {
return fmt.Errorf("unable to write Kubernetes configuration file: %s", err)
}
fmt.Println("Bootstrapping Kubernetes cluster (can take up to several minutes):")
sshClient, err := newSSHClient(
vm.IP().String(),
userName,
getKeyPairPath(vm.ID.String()),
)
if err != nil {
return fmt.Errorf("unable to initialize SSH client: %s", err)
}
if err := bootstrapExokubeCluster(sshClient, kubeCluster{
Name: clusterName,
KubernetesVersion: kubernetesVersion,
CalicoVersion: calicoVersion,
DockerVersion: dockerVersion,
Address: vm.IP().String(),
// Calico 3.4 and 3.5 have a different set of files
IsOldCalico: strings.Compare("3.6", calicoVersion) == 1,
}, kubeCreateDebug); err != nil {
return fmt.Errorf("cluster bootstrap failed: %s", err)
}
fmt.Printf(`
Your Kubernetes cluster is ready. What do now?
1. Install the "kubectl" command, if you don't have it already:
https://kubernetes.io/docs/tasks/tools/install-kubectl/
2. Execute the following command:
eval $(exo lab kube env "%s")
You might want to persist this change by adding it to your shell startup
configuration (e.g. ~/.bashrc, ~/.zshrc).
3. Check that your cluster is reachable:
kubectl cluster-info
4. When you're done with your cluster, you can either:
* stop it using the "exo lab kube stop" command
* restart it later using the "exo lab kube start" command
* delete it permanently using the "exo lab kube delete" command
`,
clusterName)
return nil
},
}
// createExokubeSecurityGroup creates the firewall security group to put kube VM instances into, or returns it if it
// already exists.
func createExokubeSecurityGroup() (*egoscale.SecurityGroup, error) {
sg, err := getSecurityGroupByNameOrID(kubeSecurityGroup)
if err == nil {
return sg, err
}
r, ok := err.(*egoscale.ErrorResponse)
if !ok || r.ErrorCode != egoscale.ParamError {
return nil, err
}
resp, err := cs.RequestWithContext(gContext, &egoscale.CreateSecurityGroup{
Name: kubeSecurityGroup,
Description: "Created by exo CLI",
})
if err != nil {
return nil, err
}
sg = resp.(*egoscale.SecurityGroup)
cidrList := []egoscale.CIDR{
*egoscale.MustParseCIDR("0.0.0.0/0"),
*egoscale.MustParseCIDR("::/0"),
}
sgRules := []egoscale.AuthorizeSecurityGroupIngress{{
Description: "SSH",
Protocol: "TCP",
StartPort: 22,
EndPort: 22,
}, {
Description: "Docker API",
Protocol: "TCP",
StartPort: 2376,
EndPort: 2376,
}, {
Description: "Kubernetes API",
Protocol: "TCP",
StartPort: 6443,
EndPort: 6443,
}}
for _, rule := range sgRules {
rule.SecurityGroupID = sg.ID
rule.CIDRList = cidrList
if _, err = cs.RequestWithContext(gContext, rule); err != nil {
return nil, err
}
}
return sg, nil
}
func bootstrapExokubeCluster(sshClient *sshClient, cluster kubeCluster, debug bool) error {
for _, step := range kubeBootstrapSteps {
var (
stdout, stderr io.Writer
cmd bytes.Buffer
errBuf bytes.Buffer
)
stderr = &errBuf
if debug {
stdout = os.Stderr
stderr = os.Stderr
}
err := template.Must(template.New("command").Parse(step.command)).Execute(&cmd, cluster)
if err != nil {
return fmt.Errorf("template error: %s", err)
}
fmt.Printf("%s... ", step.name)
if err := sshClient.runCommand(cmd.String(), stdout, stderr); err != nil {
fmt.Printf("\n%s: failed\n", step.name)
if errBuf.Len() > 0 {
fmt.Println(errBuf.String())
}
return err
}
fmt.Printf("success!\n")
}
for _, file := range []string{"ca.pem", "cert.pem", "key.pem"} {
err := sshClient.scp("/etc/docker/"+file, path.Join(getKubeconfigPath(cluster.Name), "docker", file))
if err != nil {
return fmt.Errorf("unable to retrieve Docker host file %q: %s", file, err)
}
}
err := sshClient.scp("/etc/kubernetes/admin.conf", path.Join(getKubeconfigPath(cluster.Name), "kubeconfig"))
if err != nil {
return fmt.Errorf("unable to retrieve Kubernetes cluster configuration: %s", err)
}
return nil
}
type sshClient struct {
host string
hostKey ssh.Signer
user string
c *ssh.Client
}
func newSSHClient(host, hostUser, keyFile string) (*sshClient, error) {
var c = sshClient{
host: host + ":22",
user: hostUser,
}
key, err := ioutil.ReadFile(keyFile)
if err != nil {
return nil, fmt.Errorf("unable to read cluster instance SSH private key: %s", err)
}
if c.hostKey, err = ssh.ParsePrivateKey(key); err != nil {
return nil, fmt.Errorf("unable to parse cluster instance SSH private key: %s", err)
}
return &c, nil
}
func (c *sshClient) runCommand(cmd string, stdout, stderr io.Writer) error {
var err error
retryOp := func() error {
if c.c, err = ssh.Dial("tcp", c.host, &ssh.ClientConfig{
User: c.user,
Auth: []ssh.AuthMethod{ssh.PublicKeys(c.hostKey)},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}); err != nil {
return fmt.Errorf("unable to connect to cluster instance: %s", err)
}
sshSession, err := c.c.NewSession()
if err != nil {
return fmt.Errorf("unable to create SSH session: %s", err)
}
defer sshSession.Close()
sshSession.Stdout = stdout
sshSession.Stderr = stderr
if err := sshSession.Run(cmd); err != nil {
return err
}
return nil
}
if err = backoff.RetryNotify(
retryOp,
backoff.WithMaxRetries(backoff.NewConstantBackOff(10*time.Second), 6),
func(_ error, d time.Duration) {
if kubeCreateDebug {
fmt.Printf("! Cluster instance not ready yet, retrying in %s...\n", d)
}
}); err != nil {
return err
}
return nil
}
func (c *sshClient) scp(src, dst string) error {
var buf bytes.Buffer
if err := c.runCommand(fmt.Sprintf("sudo cat %s", src), &buf, nil); err != nil {
return err
}
if _, err := os.Stat(path.Dir(dst)); os.IsNotExist(err) {
if err := os.MkdirAll(path.Dir(dst), os.ModePerm); err != nil {
return fmt.Errorf("unable to create directory %q: %s", path.Dir(dst), err)
}
}
return ioutil.WriteFile(dst, buf.Bytes(), 0600)
}
// fetchKubernetesVersion fetches the latest stable version from the official
// release source, or if a specific version is requested checks if it actually
// exists.
//
// https://godoc.org/github.com/kubernetes/kubernetes/cmd/kubeadm/app/util#KubernetesReleaseVersion
func fetchKubernetesVersion(requested string) (string, error) {
if requested != "" {
r, err := http.Head(fmt.Sprintf("https://dl.k8s.io/release/v%s/bin/linux/amd64/kubectl", requested))
if err != nil {
return "", err
}
defer r.Body.Close()
if r.StatusCode != http.StatusOK {
return "", fmt.Errorf("unable to find Kubernetes release for version %q", requested)
}
return requested, nil
}
r, err := http.Get("https://dl.k8s.io/release/stable.txt")
if err != nil {
return "", err
}
defer r.Body.Close()
if r.StatusCode != http.StatusOK {
return "", fmt.Errorf("unable to find Kubernetes release for stable version")
}
b, err := ioutil.ReadAll(r.Body)
if err != nil {
return "", err
}
v := strings.TrimSuffix(strings.TrimPrefix(string(b), "v"), "\n")
_, err = semver.Parse(v)
return v, err
}
func init() {
kubeCreateCmd.PersistentFlags().BoolVarP(&kubeCreateDebug, "debug", "d", false, "debug mode on")
kubeCreateCmd.Flags().StringP("size", "s", "medium", "<name | id> "+
"(micro|tiny|small|medium|large|extra-large|huge|mega|titan|jumbo)")
kubeCreateCmd.Flags().StringP("version", "v", "", "install a specific Kubernetes version")
kubeCreateCmd.Flags().String("calico-version", "", "install a specific Calico version")
kubeCreateCmd.Flags().String("docker-version", "", "install a specific Docker version")
kubeCmd.AddCommand(kubeCreateCmd)
}