136 lines
4.3 KiB
Markdown
136 lines
4.3 KiB
Markdown
# Kubernetes plugin for drone.io
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#### [Docker Repository on Docker Cloud](https://cloud.docker.com/app/razorpay/repository/docker/razorpay/drone-kubernetes)
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## Borrowed and distilled from [honestbee/drone-kubernetes](https://github.com/honestbee/drone-kubernetes)
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This plugin allows to update a Kubernetes deployment.
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- Cert based auth for tls
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- Insecure auth without tls
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This version deprecates token based auth
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## Usage
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This pipeline will update the `my-deployment` deployment with the image tagged `DRONE_COMMIT_SHA:0:8`
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```yaml
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pipeline:
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deploy:
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image: razorpay/drone-kubernetes
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pull: true
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secrets:
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- docker_username
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- docker_password
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- server_url_<cluster>
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- server_cert_<cluster>
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- client_cert_<cluster>
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- client_key_<cluster>
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- ...
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user: <kubernetes-user with a cluster-rolebinding>
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cluster: <kubernetes-cluster>
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deployment: [<kubernetes-deployements, ...>]
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repo: <org/repo>
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container: [ <containers,...> ]
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namespace: <kubernetes-namespace>
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tag:
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- ${DRONE_REPO_BRANCH}-${DRONE_COMMIT_SHA}
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- ...
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when:
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environment: <kubernetes-cluster>
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branch: [ <branches>,... ]
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event:
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exclude: [push, pull_request, tag]
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include: [deployment]
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```
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## Required secrets
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- server_url
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- tls:
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- server_cert
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- `kubectl get secret [ your default secret name ] -o yaml | egrep 'ca.crt:' > ca.crt`
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- `kubectl get secret [ your default secret name ] -o yaml | egrep 'ca.key:' > ca.key`
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- client_cert
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- client_key
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- ```
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openssl genrsa -out client.key
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openssl req -new -key client.key -out client.csr -subj "/CN=drone/O=org"
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openssl x509 -req -in client.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out client.crt -days 500
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```
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- ```
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cat ca.crt | base64 > car.crt.enc
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cat client.crt | base64 > client.crt.enc
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cat client.key | base64 > client.key.enc
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```
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- ```
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drone secret add -repository razorpay/gimli -image razorpay/drone-kubernetes -event deployment -name server_url_<cluster> -value https://k8s.org.com.:443
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drone secret add -repository razorpay/gimli -image razorpay/drone-kubernetes -event deployment -name server_cert_<cluster> -value @./ca.crt.enc
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drone secret add -repository razorpay/gimli -image razorpay/drone-kubernetes -event deployment -name client_cert_<cluster> -value @./client.crt.enc
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drone secret add -repository razorpay/gimli -image razorpay/drone-kubernetes -event deployment -name client_key_<cluster> -value @./client.key.enc
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```
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When using TLS Verification, ensure Server Certificate used by kubernetes API server
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is signed for SERVER url ( could be a reason for failures if using aliases of kubernetes cluster )
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### RBAC
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When using a version of kubernetes with RBAC (role-based access control)
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enabled, you will not be able to use the default service account, since it does
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not have access to update deployments. Instead, you will need to create a
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custom service account with the appropriate permissions (`Role` and `RoleBinding`, or `ClusterRole` and `ClusterRoleBinding` if you need access across namespaces using the same service account).
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As an example (for the `web` namespace):
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```yaml
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apiVersion: v1
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kind: ServiceAccount
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metadata:
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name: drone-deploy
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namespace: web
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---
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apiVersion: rbac.authorization.k8s.io/v1beta1
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kind: Role
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metadata:
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name: drone-deploy
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namespace: web
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rules:
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- apiGroups: ["extensions"]
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resources: ["deployments"]
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verbs: ["get","list","patch","update"]
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---
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apiVersion: rbac.authorization.k8s.io/v1beta1
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kind: RoleBinding
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metadata:
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name: drone-deploy
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namespace: web
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subjects:
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- kind: ServiceAccount
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name: drone-deploy
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namespace: web
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roleRef:
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kind: Role
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name: drone-deploy
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apiGroup: rbac.authorization.k8s.io
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```
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Once the service account is created, you can extract the `ca.cert` and `token`
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parameters as mentioned for the default service account above:
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```
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kubectl -n web get secrets
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# Substitute XXXXX below with the correct one from the above command
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kubectl -n web get secret/drone-deploy-token-XXXXX -o yaml | egrep 'ca.crt:|token:'
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```
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## To do
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Replace the current kubectl bash script with a go implementation.
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### Special thanks
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Inspired by [drone-helm](https://github.com/ipedrazas/drone-helm).
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