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konfigadm.go
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konfigadm.go
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package phases
import (
"fmt"
"github.com/flanksource/commons/files"
"github.com/flanksource/commons/certs"
_ "github.com/flanksource/konfigadm/pkg" // initialize konfigadm
konfigadm "github.com/flanksource/konfigadm/pkg/types"
"github.com/flanksource/yaml"
"github.com/moshloop/platform-cli/pkg/phases/kubeadm"
"github.com/moshloop/platform-cli/pkg/platform"
"github.com/pkg/errors"
)
var envVars = map[string]string{
"ETCDCTL_ENDPOINTS": "https://127.0.0.1:2379",
"ETCDCTL_CACERT": "/etc/kubernetes/pki/etcd/ca.crt",
"ETCDCTL_CERT": "/etc/kubernetes/pki/etcd/healthcheck-client.crt",
"ETCDCTL_KEY": "/etc/kubernetes/pki/etcd/healthcheck-client.key",
"KUBECONFIG": "/etc/kubernetes/admin.conf",
}
const updateHostsFileCmd = "echo $(ifconfig ens160 | grep inet | awk '{print $2}' | head -n1 ) $(hostname) >> /etc/hosts"
const kubeadmInitCmd = "kubeadm init --config /etc/kubernetes/kubeadm.conf | tee /var/log/kubeadm.log"
const kubeadmMasterJoinCmdf = "kubeadm join --control-plane --token %s --certificate-key %s --discovery-token-unsafe-skip-ca-verification %s | tee /var/log/kubeadm.log"
const kubeadmNodeJoinCmdf = "kubeadm join --token %s --discovery-token-unsafe-skip-ca-verification %s | tee /var/log/kubeadm.log"
const noCAErrorText = `Must specify a 'ca'' section in the platform config.
e.g.:
ca:
cert: .certs/root-ca-crt.pem
privateKey: .certs/root-ca-key.pem
password: foobar
CA certs are generated using platform-cli ca generate
`
// CreatePrimaryMaster creates a konfigadm config for the primary master.
func CreatePrimaryMaster(platform *platform.Platform) (*konfigadm.Config, error) {
if platform.Name == "" {
return nil, errors.New("Must specify a platform name")
}
if platform.Datacenter == "" {
return nil, errors.New("Must specify a platform datacenter")
}
hostname := ""
platform.Init()
cfg, err := baseKonfig(platform.Master.KonfigadmFile)
if err != nil {
return nil, fmt.Errorf("createPrimaryMaster: failed to get baseKonfig: %v", err)
}
if err := addInitKubeadmConfig(platform, cfg); err != nil {
return nil, fmt.Errorf("createPrimaryMaster: failed to add kubeadm config: %v", err)
}
if err := addAuditConfig(platform, cfg); err != nil {
return nil, fmt.Errorf("createPrimaryMaster: failed to add audit config: %v", err)
}
createConsulService(hostname, platform, cfg)
createClientSideLoadbalancers(platform, cfg)
if err := addCerts(platform, cfg); err != nil {
return nil, errors.Wrap(err, "failed to add certs")
}
cfg.AddCommand(kubeadmInitCmd)
return cfg, nil
}
// CreateSecondaryMaster creates a konfigadm config for a secondary master.
func CreateSecondaryMaster(platform *platform.Platform) (*konfigadm.Config, error) {
hostname := ""
platform.Init()
cfg, err := baseKonfig(platform.Master.KonfigadmFile)
if err != nil {
return nil, fmt.Errorf("createSecondaryMaster: failed to get baseKonfig: %v", err)
}
token, err := kubeadm.GetOrCreateBootstrapToken(platform)
if err != nil {
return nil, fmt.Errorf("createSecondaryMaster: failed to get/create bootstrap token: %v", err)
}
certKey, err := kubeadm.UploadControlPlaneCerts(platform)
if err != nil {
return nil, fmt.Errorf("createSecondaryMaster: failed to upload control plane certs: %v", err)
}
createConsulService(hostname, platform, cfg)
createClientSideLoadbalancers(platform, cfg)
if err = addCerts(platform, cfg); err != nil {
return nil, errors.Wrap(err, "Failed to add certs")
}
cfg.AddCommand(fmt.Sprintf(kubeadmMasterJoinCmdf, token, certKey, platform.JoinEndpoint))
return cfg, nil
}
// CreateWorker creates a konfigadm config for a worker in node group nodegroup
func CreateWorker(nodegroup string, platform *platform.Platform) (*konfigadm.Config, error) {
platform.Init()
if platform.Nodes == nil {
return nil, fmt.Errorf("CreateWorker failed to create worker - nil Nodes supplied")
}
if _, ok := platform.Nodes[nodegroup]; !ok {
return nil, fmt.Errorf("CreateWorker failed to create worker - supplied nodegroup not found")
}
node := platform.Nodes[nodegroup]
baseConfig := node.KonfigadmFile
cfg, err := baseKonfig(baseConfig)
if err != nil {
return nil, fmt.Errorf("createWorker: failed to get baseKonfig: %v", err)
}
token, err := kubeadm.GetOrCreateBootstrapToken(platform)
if err != nil {
return nil, fmt.Errorf("createWorker: failed to get/create bootstrap token: %v", err)
}
createClientSideLoadbalancers(platform, cfg)
cfg.AddCommand(fmt.Sprintf(kubeadmNodeJoinCmdf, token, platform.JoinEndpoint))
return cfg, nil
}
// baseKonfig generates a base konfigadm configuration.
// It copies in the required environment variables and
// initial commands.
func baseKonfig(initialKonfigadmFile string) (*konfigadm.Config, error) {
var cfg *konfigadm.Config
var err error
if initialKonfigadmFile == "" {
cfg, err = konfigadm.NewConfig().Build()
} else {
cfg, err = konfigadm.NewConfig(initialKonfigadmFile).Build()
}
if err != nil {
return nil, fmt.Errorf("baseKonfig: failed to get config: %v", err)
}
for k, v := range envVars {
cfg.Environment[k] = v
}
// update hosts file with hostname
cfg.AddCommand(updateHostsFileCmd)
return cfg, nil
}
// addAuditConfig derives the initial admin config for a cluster from its platform
// config and adds it to its konfigadm files
func addAuditConfig(platform *platform.Platform, cfg *konfigadm.Config) error {
if platform.Kubernetes.AuditConfig.PolicyFile != "" {
// clusters audit policy files are injected into the machine via konfigadm
ap := files.SafeRead(platform.Kubernetes.AuditConfig.PolicyFile)
if ap == "" {
return fmt.Errorf("unable to read audit policy file")
}
cfg.Files[kubeadm.AuditPolicyPath] = ap
}
return nil
}
// addCerts derives certs and key files for a cluster from its platform
// config and adds the cert and key files to its konfigadm files
func addCerts(platform *platform.Platform, cfg *konfigadm.Config) error {
if platform.CA == nil {
return errors.New(noCAErrorText)
}
clusterCA := certs.NewCertificateBuilder("kubernetes-ca").CA().Certificate
clusterCA, err := platform.GetCA().SignCertificate(clusterCA, 10)
if err != nil {
return fmt.Errorf("addCerts: failed to sign certificate: %v", err)
}
// plus any cert signed by this cluster specific CA
crt := string(clusterCA.EncodedCertificate()) + "\n"
// any cert signed by the global CA should be allowed
crt = crt + string(platform.GetCA().GetPublicChain()[0].EncodedCertificate()) + "\n"
// csrsigning controller doesn't like having more than 1 CA cert passed to it
cfg.Files["/etc/kubernetes/pki/csr-ca.crt"] = string(clusterCA.EncodedCertificate())
cfg.Files["/etc/kubernetes/pki/csr-ca.key"] = string(clusterCA.EncodedPrivateKey())
cfg.Files["/etc/kubernetes/pki/ca.crt"] = crt
cfg.Files["/etc/kubernetes/pki/ca.key"] = string(clusterCA.EncodedPrivateKey())
cfg.Files["/etc/ssl/certs/openid-ca.pem"] = string(platform.GetIngressCA().GetPublicChain()[0].EncodedCertificate())
return nil
}
// addInitKubeadmConfig derives the initial kubeadm config for a cluster from its platform
// config and adds it to its konfigadm files
func addInitKubeadmConfig(platform *platform.Platform, cfg *konfigadm.Config) error {
cluster := kubeadm.NewClusterConfig(platform)
data, err := yaml.Marshal(cluster)
if err != nil {
return fmt.Errorf("addInitKubeadmConfig: failed to marshal cluster config: %v", err)
}
platform.Tracef("Using kubeadm config: \n%s", string(data))
cfg.Files["/etc/kubernetes/kubeadm.conf"] = string(data)
if platform.Kubernetes.AuditConfig.PolicyFile != "" {
// clusters audit policy files are injected into the machine via konfigadm
ap := files.SafeRead(platform.Kubernetes.AuditConfig.PolicyFile)
if ap == "" {
return fmt.Errorf("unable to read audit policy file")
}
cfg.Files[kubeadm.AuditPolicyPath] = ap
}
return nil
}
// createConsulService derives the initial consul config for a cluster from its platform
// config and adds it to its konfigadm files
func createConsulService(hostname string, platform *platform.Platform, cfg *konfigadm.Config) {
cfg.Files["/etc/kubernetes/consul/api.json"] = fmt.Sprintf(`
{
"leave_on_terminate": true,
"rejoin_after_leave": true,
"service": {
"id": "%s",
"name": "%s",
"address": "",
"check": {
"id": "api-server",
"name": " TCP on port 6443",
"tcp": "localhost:6443",
"interval": "120s",
"timeout": "60s"
},
"port": 6443,
"enable_tag_override": false
}
}
`, hostname, platform.Name)
}
// createClientSideLoadbalancers derives the client side loadbalancer configs for a cluster from its platform
// config and adds it to its konfigadm containers
func createClientSideLoadbalancers(platform *platform.Platform, cfg *konfigadm.Config) {
cfg.Containers = append(cfg.Containers, konfigadm.Container{
Image: platform.GetImagePath("docker.io/consul:1.3.1"),
Env: map[string]string{
"CONSUL_CLIENT_INTERFACE": "ens160",
"CONSUL_BIND_INTERFACE": "ens160",
},
Args: fmt.Sprintf("agent -join=%s:8301 -datacenter=%s -data-dir=/consul/data -domain=consul -config-dir=/consul-configs", platform.Consul, platform.Datacenter),
DockerOpts: "--net host",
Volumes: []string{
"/etc/kubernetes/consul:/consul-configs",
},
}, konfigadm.Container{
Image: platform.GetImagePath("docker.io/moshloop/tcp-loadbalancer:0.1"),
Service: "haproxy",
DockerOpts: "--net host -p 8443:8443",
Env: map[string]string{
"CONSUL_CONNECT": platform.Consul + ":8500",
"SERVICE_NAME": platform.Name,
"PORT": "8443",
},
})
}