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Backport of docs/vault-k8s: example using pkiCert and writeToFile into release/1.13.x #19972

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Apr 4, 2023
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Backport of docs/vault-k8s: example using pkiCert and writeToFile into release/1.13.x #19972

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45 changes: 45 additions & 0 deletions website/content/docs/platform/k8s/injector/examples.mdx
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Expand Up @@ -340,3 +340,48 @@ spec:
ports:
- containerPort: 9090
```

## PKI Cert Example

The following example demonstrates how to use the [`pkiCert` function][pkiCert] and
[`writeToFile` function][writeToFile] from consul-template to create two files
from a template: one for the certificate and CA (`cert.pem`) and one for the key
(`cert.key`) generated by [Vault's PKI Secrets Engine](/vault/docs/secrets/pki).

```yaml
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: web-deployment
labels:
app: web
spec:
replicas: 1
selector:
matchLabels:
app: web
template:
metadata:
labels:
app: web
annotations:
vault.hashicorp.com/agent-inject: 'true'
vault.hashicorp.com/role: 'web'
vault.hashicorp.com/agent-inject-secret-certs: 'pki/issue/cert'
vault.hashicorp.com/agent-inject-template-certs: |
{{- with pkiCert "pki/issue/cert" "common_name=test.example.com" "ttl=2h" -}}
{{ .Cert }}{{ .CA }}{{ .Key }}
{{ .Key | writeToFile "/vault/secrets/cert.key" "vault" "vault" "0644" }}
{{ .CA | writeToFile "/vault/secrets/cert.pem" "vault" "vault" "0644" }}
{{ .Cert | writeToFile "/vault/secrets/cert.pem" "vault" "vault" "0644" "append" }}
{{- end -}}
spec:
serviceAccountName: web
containers:
- name: web
image: nginx
```

[pkiCert]: https://github.com/hashicorp/consul-template/blob/main/docs/templating-language.md#pkicert
[writeToFile]: https://github.com/hashicorp/consul-template/blob/main/docs/templating-language.md#writeToFile