Gestion de certificats SSL avec cert-manager et Nginx dans Kubernetes

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Je continue mon auto-formation sur Kubernetes, après avoir monté mes clusters (voir les articles précédents) j'ai besoins maintenant d'accéder à des applications web (interface de grafana, de longhorn etc ...) en passant par une connexion sécurisée avec un certificat SSL.

J'utilises habituellement Let's Encrypt pour les certificats et donc pourquoi changer. Cependant il faut un mécanisme pour les mettre automatiquement en place lors du déploiement des applications et les renouveller automatiquement.

Comme l'optique est de gérer ça dans le cluster, il faut que les certificats soient gérés par un outils et pas stockés en local sur le disque d'un des noeuds.

C'est donc ce que nous allons voir avec cert-manager en utilisant un ingress Nginx, je ne reviendrais pas sur la définition d'un Ingress il y a plein d'articles là-dessus.

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Mise en place cert-manager

On déploie la dernière version de cert-manager :

Ce qui va déployer des pods, des services dans le namespace cert-manager :

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Mise en place de l'Ingress et des Issuers

Pour mettre en place notre Ingress il faut qu'il soit paramétré pour écouter sur l'ip externe publique de mon cluster.

Pour cela je vais utiliser la configuration proposée ici : https://github.com/imixs/imixs-cloud/tree/master/management/nginx en modifiant dans 020-service.yaml mon adresse ip.

On vérifie que tout est ok :

C'est prêt, on à Ingress fonctionnel avec deux ClusterIssuers (https://cert-manager.io/docs/concepts/issuer/) qui vont permettre de gérer les fournisseurs de certificats SSL, pour le moment Let's Encrypt Staging et Let's Encrypt Prod.

Attention il faut que les ClusterIssuers soient en Ready pour que cela fonctionne, j'ai eu un petit soucis avec mon cluster https://github.com/jetstack/cert-manager/issues/3688

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Test

Pour tester tout ça on va déployer une application basique whoami. Avec les 3 fichiers deployment, service et ingress https://github.com/imixs/imixs-cloud/tree/master/apps/whoami

Il suffit de modifier l'url dans le fichier 030-ingress.yml et de modifier l'issuer si vous voulez passer en letesencrypt-prod. Ensuite pour déployer :

Pour vérifier si le certificat à bien été généré :

Le certificat est bien généré (hésitez pas à faire des describes sur les objets pour regarder les détails) et l'ingress va bien router les requêtes vers le bon service. C'est parfait, il me reste plus qu'à déployer d'autres applications avec cert-manager et nginx.

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Sources

Je tiens à mettre en avant ce projet que j'utilise régulièrement pour mes test : ## Sources
https://github.com/imixs/imixs-cloud

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Gestion de certificats SSL avec cert-manager et Nginx dans Kubernetes

Mise en place cert-manager

Mise en place de l'Ingress et des Issuers

Test

Sources

Suivez-nous

Liens utiles

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