Mo ṣafihan ikẹkọ kan si akiyesi rẹ fun ṣiṣẹda iraye si iṣupọ Kubernetes nipa lilo Dex, dex-k8s-authenticator ati GitHub.
Meme agbegbe lati Kubernetes-ede Rọsia iwiregbe ni
Ifihan
A lo Kubernetes lati ṣẹda awọn agbegbe ti o ni agbara fun idagbasoke ati ẹgbẹ QA. Nitorinaa a fẹ lati fun wọn ni iraye si iṣupọ fun dasibodu mejeeji ati kubectl. Ko dabi OpenShift, vanilla Kubernetes ko ni ijẹrisi abinibi, nitorinaa a lo awọn irinṣẹ ẹnikẹta fun eyi.
Ninu iṣeto yii a lo:
- - ohun elo wẹẹbu fun ti ipilẹṣẹ kubectl konfigi
- - OpenID So olupese
- GitHub - nìkan nitori a lo GitHub ni ile-iṣẹ wa
A gbiyanju lati lo Google OIDC, sugbon laanu a lati bẹrẹ wọn pẹlu awọn ẹgbẹ, nitorina isọdọkan pẹlu GitHub baamu wa daradara. Laisi aworan agbaye, kii yoo ṣee ṣe lati ṣẹda awọn ilana RBAC ti o da lori awọn ẹgbẹ.
Nitorinaa, bawo ni ilana aṣẹ Kubernetes wa ṣe n ṣiṣẹ ni aṣoju wiwo:
Ilana aṣẹ
Awọn alaye diẹ sii ati aaye nipasẹ aaye:
- Olumulo wọle sinu dex-k8s-authenticator (
login.k8s.example.com) - dex-k8s-authenticator dari ibeere naa si Dex (
dex.k8s.example.com) - Dex àtúnjúwe si GitHub oju-iwe wiwọle
- GitHub ṣe ipilẹṣẹ alaye aṣẹ pataki ati da pada si Dex
- Dex kọja alaye ti o gba si dex-k8s-authenticator
- Olumulo gba aami OIDC lati GitHub
- dex-k8s-authenticator afikun àmi to kubeconfig
- kubectl kọja ami si KubeAPIServer
- KubeAPIServer pada awọn iraye si kubectl da lori ami ti o kọja
- Olumulo n wọle lati kubectl
Awọn iṣe igbaradi
Nitoribẹẹ, a ti fi iṣupọ Kubernetes tẹlẹ sori ẹrọ (k8s.example.com), ati pe o tun wa pẹlu HELM ti a ti fi sii tẹlẹ. A tun ni agbari lori GitHub (super-org).
Ti o ko ba ni HELM, fi sii .
Ni akọkọ a nilo lati ṣeto GitHub.
Lọ si oju-iwe eto eto, (https://github.com/organizations/super-org/settings/applications) ati ṣẹda ohun elo tuntun (Aṣẹ OAuth App):
Ṣiṣẹda ohun elo tuntun lori GitHub
Fọwọsi awọn aaye pẹlu awọn URL pataki, fun apẹẹrẹ:
- URL oju-iwe akọkọ:
https://dex.k8s.example.com - URL ipe pada fun aṣẹ:
https://dex.k8s.example.com/callback
Ṣọra pẹlu awọn ọna asopọ, o ṣe pataki lati ma padanu awọn slashes.
Ni idahun si fọọmu ti o pari, GitHub yoo ṣe ipilẹṣẹ Client ID и Client secret, pa wọn mọ ni ibi aabo, wọn yoo wulo fun wa (fun apẹẹrẹ, a lo fun titoju awọn asiri):
Client ID: 1ab2c3d4e5f6g7h8
Client secret: 98z76y54x32w1
Mura awọn igbasilẹ DNS fun awọn subdomains login.k8s.example.com и dex.k8s.example.com, bakanna bi awọn iwe-ẹri SSL fun ingress.
Jẹ ki a ṣẹda awọn iwe-ẹri SSL:
cat <<EOF | kubectl create -f -
apiVersion: certmanager.k8s.io/v1alpha1
kind: Certificate
metadata:
name: cert-auth-dex
namespace: kube-system
spec:
secretName: cert-auth-dex
dnsNames:
- dex.k8s.example.com
acme:
config:
- http01:
ingressClass: nginx
domains:
- dex.k8s.example.com
issuerRef:
name: le-clusterissuer
kind: ClusterIssuer
---
apiVersion: certmanager.k8s.io/v1alpha1
kind: Certificate
metadata:
name: cert-auth-login
namespace: kube-system
spec:
secretName: cert-auth-login
dnsNames:
- login.k8s.example.com
acme:
config:
- http01:
ingressClass: nginx
domains:
- login.k8s.example.com
issuerRef:
name: le-clusterissuer
kind: ClusterIssuer
EOF
kubectl describe certificates cert-auth-dex -n kube-system
kubectl describe certificates cert-auth-login -n kube-system
Cluster Olufunni pẹlu akọle le-clusterissuer yẹ ki o wa tẹlẹ, ṣugbọn ti kii ba ṣe bẹ, ṣẹda rẹ nipa lilo HELM:
helm install --namespace kube-system -n cert-manager stable/cert-manager
cat << EOF | kubectl create -f -
apiVersion: certmanager.k8s.io/v1alpha1
kind: ClusterIssuer
metadata:
name: le-clusterissuer
namespace: kube-system
spec:
acme:
server: https://acme-v02.api.letsencrypt.org/directory
email: [email protected]
privateKeySecretRef:
name: le-clusterissuer
http01: {}
EOFKubeAPIServer iṣeto ni
Fun kubeAPIServer lati ṣiṣẹ, o nilo lati tunto OIDC ki o ṣe imudojuiwọn iṣupọ naa:
kops edit cluster
...
kubeAPIServer:
anonymousAuth: false
authorizationMode: RBAC
oidcClientID: dex-k8s-authenticator
oidcGroupsClaim: groups
oidcIssuerURL: https://dex.k8s.example.com/
oidcUsernameClaim: email
kops update cluster --yes
kops rolling-update cluster --yesA lo fun imuṣiṣẹ awọn iṣupọ, sugbon yi ṣiṣẹ bakanna fun .
Dex iṣeto ni ati dex-k8s-authenticator
Fun Dex lati ṣiṣẹ, o nilo lati ni ijẹrisi ati bọtini kan lati ọdọ Kubernetes titunto si, jẹ ki a gba lati ibẹ:
sudo cat /srv/kubernetes/ca.{crt,key}
-----BEGIN CERTIFICATE-----
AAAAAAAAAAABBBBBBBBBBCCCCCC
-----END CERTIFICATE-----
-----BEGIN RSA PRIVATE KEY-----
DDDDDDDDDDDEEEEEEEEEEFFFFFF
-----END RSA PRIVATE KEY-----Jẹ ki a ṣe ẹda ibi ipamọ dex-k8s-authenticator:
git clone [email protected]:mintel/dex-k8s-authenticator.git
cd dex-k8s-authenticator/Lilo awọn faili iye, a le ni irọrun tunto awọn oniyipada fun wa .
Jẹ ki a ṣe apejuwe iṣeto ni fun Dex:
cat << EOF > values-dex.yml
global:
deployEnv: prod
tls:
certificate: |-
-----BEGIN CERTIFICATE-----
AAAAAAAAAAABBBBBBBBBBCCCCCC
-----END CERTIFICATE-----
key: |-
-----BEGIN RSA PRIVATE KEY-----
DDDDDDDDDDDEEEEEEEEEEFFFFFF
-----END RSA PRIVATE KEY-----
ingress:
enabled: true
annotations:
kubernetes.io/ingress.class: nginx
kubernetes.io/tls-acme: "true"
path: /
hosts:
- dex.k8s.example.com
tls:
- secretName: cert-auth-dex
hosts:
- dex.k8s.example.com
serviceAccount:
create: true
name: dex-auth-sa
config: |
issuer: https://dex.k8s.example.com/
storage: # https://github.com/dexidp/dex/issues/798
type: sqlite3
config:
file: /var/dex.db
web:
http: 0.0.0.0:5556
frontend:
theme: "coreos"
issuer: "Example Co"
issuerUrl: "https://example.com"
logoUrl: https://example.com/images/logo-250x25.png
expiry:
signingKeys: "6h"
idTokens: "24h"
logger:
level: debug
format: json
oauth2:
responseTypes: ["code", "token", "id_token"]
skipApprovalScreen: true
connectors:
- type: github
id: github
name: GitHub
config:
clientID: $GITHUB_CLIENT_ID
clientSecret: $GITHUB_CLIENT_SECRET
redirectURI: https://dex.k8s.example.com/callback
orgs:
- name: super-org
teams:
- team-red
staticClients:
- id: dex-k8s-authenticator
name: dex-k8s-authenticator
secret: generatedLongRandomPhrase
redirectURIs:
- https://login.k8s.example.com/callback/
envSecrets:
GITHUB_CLIENT_ID: "1ab2c3d4e5f6g7h8"
GITHUB_CLIENT_SECRET: "98z76y54x32w1"
EOF
Ati fun dex-k8s-authenticator:
cat << EOF > values-auth.yml
global:
deployEnv: prod
dexK8sAuthenticator:
clusters:
- name: k8s.example.com
short_description: "k8s cluster"
description: "Kubernetes cluster"
issuer: https://dex.k8s.example.com/
k8s_master_uri: https://api.k8s.example.com
client_id: dex-k8s-authenticator
client_secret: generatedLongRandomPhrase
redirect_uri: https://login.k8s.example.com/callback/
k8s_ca_pem: |
-----BEGIN CERTIFICATE-----
AAAAAAAAAAABBBBBBBBBBCCCCCC
-----END CERTIFICATE-----
ingress:
enabled: true
annotations:
kubernetes.io/ingress.class: nginx
kubernetes.io/tls-acme: "true"
path: /
hosts:
- login.k8s.example.com
tls:
- secretName: cert-auth-login
hosts:
- login.k8s.example.com
EOFFi Dex sori ẹrọ ati dex-k8s-authenticator:
helm install -n dex --namespace kube-system --values values-dex.yml charts/dex
helm install -n dex-auth --namespace kube-system --values values-auth.yml charts/dex-k8s-authenticatorJẹ ki a ṣayẹwo iṣẹ ṣiṣe ti awọn iṣẹ naa (Dex yẹ ki o da koodu 400 pada, ati dex-k8s-authenticator yẹ ki o da koodu 200 pada):
curl -sI https://dex.k8s.example.com/callback | head -1
HTTP/2 400
curl -sI https://login.k8s.example.com/ | head -1
HTTP/2 200RBAC iṣeto ni
A ṣẹda ClusterRole kan fun ẹgbẹ, ninu ọran wa pẹlu iraye si kika-nikan:
cat << EOF | kubectl create -f -
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: cluster-read-all
rules:
-
apiGroups:
- ""
- apps
- autoscaling
- batch
- extensions
- policy
- rbac.authorization.k8s.io
- storage.k8s.io
resources:
- componentstatuses
- configmaps
- cronjobs
- daemonsets
- deployments
- events
- endpoints
- horizontalpodautoscalers
- ingress
- ingresses
- jobs
- limitranges
- namespaces
- nodes
- pods
- pods/log
- pods/exec
- persistentvolumes
- persistentvolumeclaims
- resourcequotas
- replicasets
- replicationcontrollers
- serviceaccounts
- services
- statefulsets
- storageclasses
- clusterroles
- roles
verbs:
- get
- watch
- list
- nonResourceURLs: ["*"]
verbs:
- get
- watch
- list
- apiGroups: [""]
resources: ["pods/exec"]
verbs: ["create"]
EOFJẹ ki a ṣẹda iṣeto kan fun ClusterRoleBinding:
cat <<EOF | kubectl create -f -
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
name: dex-cluster-auth
namespace: kube-system
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-read-all
subjects:
kind: Group
name: "super-org:team-red"
EOFBayi a ti ṣetan fun idanwo.
Awọn idanwo
Lọ si oju-iwe iwọle (https://login.k8s.example.com) ati buwolu wọle nipa lilo akọọlẹ GitHub rẹ:
Oju-iwe wiwọle
Oju-iwe iwọle ti darí si GitHub
Tẹle awọn ilana ti ipilẹṣẹ lati jèrè wiwọle
Lẹhin ti daakọ-sọ lati oju-iwe wẹẹbu, a le lo kubectl lati ṣakoso awọn orisun iṣupọ wa:
kubectl get po
NAME READY STATUS RESTARTS AGE
mypod 1/1 Running 0 3d
kubectl delete po mypod
Error from server (Forbidden): pods "mypod" is forbidden: User "[email protected]" cannot delete pods in the namespace "default"
Ati pe o ṣiṣẹ, gbogbo awọn olumulo GitHub ninu agbari wa le rii awọn orisun ati wọle sinu awọn adarọ-ese, ṣugbọn wọn ko ni awọn ẹtọ lati yi wọn pada.
orisun: www.habr.com