Got two types of strange situations when I deploy Vault in Kubernetes and using Kubernetes Auth method.
Kubernetes version: v1.25.6
Vault version: v1.12.1
1. It kept getting 403 permission denied from /v1/auth/kubernetes/login for about 30 minutes long time before suddenly got desired secrets successfully at vault-agent-init stage. Sometime it never got success after even several hours.
Error:
==> Vault agent started! Log data will stream in below:
==> Vault agent configuration:
Cgo: disabled
Log Level: info
Version: Vault v1.12.1, built 2022-10-27T12:32:05Z
Version Sha: e34f8a14fb7a88af4640b09f3ddbb5646b946d9c
2023-04-03T15:42:38.374Z [INFO] sink.file: creating file sink
2023-04-03T15:42:38.374Z [INFO] sink.file: file sink configured: path=/home/vault/.vault-token mode=-rw-r-----
2023-04-03T15:42:38.374Z [INFO] template.server: starting template server
2023-04-03T15:42:38.375Z [INFO] (runner) creating new runner (dry: false, once: false)
2023-04-03T15:42:38.374Z [INFO] sink.server: starting sink server
2023-04-03T15:42:38.375Z [INFO] auth.handler: starting auth handler
2023-04-03T15:42:38.375Z [INFO] auth.handler: authenticating
2023-04-03T15:42:38.375Z [INFO] (runner) creating watcher
2023-04-03T15:42:38.381Z [ERROR] auth.handler: error authenticating:
error=
| Error making API request.
|
| URL: PUT http://vault.vault.svc:8200/v1/auth/kubernetes/login
| Code: 403. Errors:
|
| * permission denied
backoff=1s
2023-04-03T15:42:39.381Z [INFO] auth.handler: authenticating
2023-04-03T15:42:39.383Z [ERROR] auth.handler: error authenticating:
error=
| Error making API request.
|
| URL: PUT http://vault.vault.svc:8200/v1/auth/kubernetes/login
| Code: 403. Errors:
|
| * permission denied
backoff=1.62s
2. Sometime it got authenticated at /v1/auth/kubernetes/login soon, but then threw the error like:
# (Can't get the output now, but something like this:)
vault.read(myapp/data/postgres/config), vault.read(myapp/data/postgres/config)
URL: GET http://vault.vault.svc:8200/v1/myapp/data/postgres/config
Code: 403. Errors:
* permission denied
How I installed Vault in namespace vault:
helm vaules.yaml:
ui:
enabled: true
server:
logLevel: trace
ha:
enabled: true
replicas: 3
raft:
enabled: true
dataStorage:
storageClass: cstor-csi
auditStorage:
storageClass: cstor-csi
authDelegator:
enabled: true
injector:
enabled: true
logLevel: trace
helm repo add hashicorp https://helm.releases.hashicorp.com
helm repo update
# Install a spceified version vault in namespace `vault`.
helm upgrade --install vault hashicorp/vault --namespace vault -f vault-values.yaml --version 0.23.0 --create-namespace
# Unseal
kubectl exec -ti vault-0 -n vault -- vault operator init > keys.txt
kubectl exec -ti vault-1 -n vault -- vault operator init >> keys.txt
kubectl exec -ti vault-2 -n vault -- vault operator init >> keys.txt
kubectl exec -ti vault-0 -n vault -- vault operator unseal
kubectl exec -ti vault-1 -n vault -- vault operator unseal
kubectl exec -ti vault-2 -n vault -- vault operator unseal
kubectl exec -it vault-0 -n vault -- /bin/sh
vault login
vault auth enable kubernetes
# Do this as document says:
vault write auth/kubernetes/config \
kubernetes_host="https://$KUBERNETES_PORT_443_TCP_ADDR:443"
vault secrets enable -path=myapp kv-v2
vault kv put myapp/postgres/config POSTGRES_DB="myapp" POSTGRES_USER="myapp" POSTGRES_PASSWORD="myapp"
vault kv get myapp/postgres/config
vault policy write myapp - <<EOF
path "myapp/data/postgres/config" {
capabilities = ["read"]
}
EOF
vault write auth/kubernetes/role/myapp \
bound_service_account_names=myapp-sa \
bound_service_account_namespaces=myapp \
policies=myapp \
ttl=3d
# create sa myapp-sa in namespace myapp, not the namespace with vault.
kubectl create sa myapp-sa -n myapp
Deployemnt of myapp in namespace myapp
# I don't know if this ClusterRoleBinding needed, but both are the same.
# apiVersion: rbac.authorization.k8s.io/v1
# kind: ClusterRoleBinding
# metadata:
# name: myapp-sa-rbac
# namespace: myapp
# roleRef:
# apiGroup: rbac.authorization.k8s.io
# kind: ClusterRole
# name: system:auth-delegator
# subjects:
# - kind: ServiceAccount
# name: myapp-sa
# namespace: myapp
---
apiVersion: v1
kind: Service
metadata:
name: myapp
namespace: myapp
spec:
type: ClusterIP
ports:
- name: myapp
port: 8080
targetPort: 8080
selector:
app: myapp
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: myapp
namespace: myapp
spec:
replicas: 1
selector:
matchLabels:
app: myapp
template:
metadata:
labels:
app: myapp
annotations:
vault.hashicorp.com/agent-inject: "true"
vault.hashicorp.com/agent-inject-status: 'update'
vault.hashicorp.com/role: "myapp"
vault.hashicorp.com/agent-inject-secret-database-config: "myapp/data/postgres/config"
# Environment variable export template
vault.hashicorp.com/agent-inject-template-database-config: |
{{ with secret "myapp/data/postgres/config" -}}
export POSTGRES_DB="{{ .Data.data.POSTGRES_DB }}"
export POSTGRES_USER="{{ .Data.data.POSTGRES_USER }}"
export POSTGRES_PASSWORD="{{ .Data.data.POSTGRES_PASSWORD }}"
{{- end }}
spec:
serviceAccountName: myapp-sa
containers:
- name: myapp
image: nginx:latest
imagePullPolicy: Always
ports:
- containerPort: 8080
command: ["sh", "-c"]
args:
- . /vault/secrets/database-config
env:
- name: POSTGRES_HOST
value: postgres
- name: POSTGRES_PORT
value: "5432"