Providing sensitive data to pods

Some applications need sensitive information, such as passwords and user names, that you do not want developers to have.

As an administrator, you can use Secret objects to provide this information without exposing that information in clear text.

Understanding secrets

The Secret object type provides a mechanism to hold sensitive information such as passwords, OKD client configuration files, private source repository credentials, and so on. Secrets decouple sensitive content from the pods. You can mount secrets into containers using a volume plug-in or the system can use secrets to perform actions on behalf of a pod.

Key properties include:

  • Secret data can be referenced independently from its definition.

  • Secret data volumes are backed by temporary file-storage facilities (tmpfs) and never come to rest on a node.

  • Secret data can be shared within a namespace.

YAML Secret object definition

  1. apiVersion: v1
  2. kind: Secret
  3. metadata:
  4. name: test-secret
  5. namespace: my-namespace
  6. type: Opaque (1)
  7. data: (2)
  8. username: dmFsdWUtMQ0K (3)
  9. password: dmFsdWUtMg0KDQo=
  10. stringData: (4)
  11. hostname: myapp.mydomain.com (5)
1Indicates the structure of the secret’s key names and values.
2The allowable format for the keys in the data field must meet the guidelines in the DNS_SUBDOMAIN value in the Kubernetes identifiers glossary.
3The value associated with keys in the data map must be base64 encoded.
4Entries in the stringData map are converted to base64 and the entry will then be moved to the data map automatically. This field is write-only; the value will only be returned via the data field.
5The value associated with keys in the stringData map is made up of plain text strings.

You must create a secret before creating the pods that depend on that secret.

When creating secrets:

  • Create a secret object with secret data.

  • Update the pod’s service account to allow the reference to the secret.

  • Create a pod, which consumes the secret as an environment variable or as a file (using a secret volume).

Types of secrets

The value in the type field indicates the structure of the secret’s key names and values. The type can be used to enforce the presence of user names and keys in the secret object. If you do not want validation, use the opaque type, which is the default.

Specify one of the following types to trigger minimal server-side validation to ensure the presence of specific key names in the secret data:

  • kubernetes.io/service-account-token. Uses a service account token.

  • kubernetes.io/basic-auth. Use with Basic Authentication.

  • kubernetes.io/ssh-auth. Use with SSH Key Authentication.

  • kubernetes.io/tls. Use with TLS certificate authorities.

Specify type: Opaque if you do not want validation, which means the secret does not claim to conform to any convention for key names or values. An opaque secret, allows for unstructured key:value pairs that can contain arbitrary values.

You can specify other arbitrary types, such as example.com/my-secret-type. These types are not enforced server-side, but indicate that the creator of the secret intended to conform to the key/value requirements of that type.

For examples of different secret types, see the code samples in Using Secrets.

Example secret configurations

The following are sample secret configuration files.

YAML Secret object that creates four files

  1. apiVersion: v1
  2. kind: Secret
  3. metadata:
  4. name: test-secret
  5. data:
  6. username: dmFsdWUtMQ0K (1)
  7. password: dmFsdWUtMQ0KDQo= (2)
  8. stringData:
  9. hostname: myapp.mydomain.com (3)
  10. secret.properties: |- (4)
  11. property1=valueA
  12. property2=valueB
1File contains decoded values.
2File contains decoded values.
3File contains the provided string.
4File contains the provided data.

YAML of a pod populating files in a volume with secret data

  1. apiVersion: v1
  2. kind: Pod
  3. metadata:
  4. name: secret-example-pod
  5. spec:
  6. containers:
  7. - name: secret-test-container
  8. image: busybox
  9. command: [ "/bin/sh", "-c", "cat /etc/secret-volume/*" ]
  10. volumeMounts:
  11. # name must match the volume name below
  12. - name: secret-volume
  13. mountPath: /etc/secret-volume
  14. readOnly: true
  15. volumes:
  16. - name: secret-volume
  17. secret:
  18. secretName: test-secret
  19. restartPolicy: Never

YAML of a pod populating environment variables with secret data

  1. apiVersion: v1
  2. kind: Pod
  3. metadata:
  4. name: secret-example-pod
  5. spec:
  6. containers:
  7. - name: secret-test-container
  8. image: busybox
  9. command: [ "/bin/sh", "-c", "export" ]
  10. env:
  11. - name: TEST_SECRET_USERNAME_ENV_VAR
  12. valueFrom:
  13. secretKeyRef:
  14. name: test-secret
  15. key: username
  16. restartPolicy: Never

YAML of a build config populating environment variables with secret data

  1. apiVersion: v1
  2. kind: BuildConfig
  3. metadata:
  4. name: secret-example-bc
  5. spec:
  6. strategy:
  7. sourceStrategy:
  8. env:
  9. - name: TEST_SECRET_USERNAME_ENV_VAR
  10. valueFrom:
  11. secretKeyRef:
  12. name: test-secret
  13. key: username

Secret data keys

Secret keys must be in a DNS subdomain.

Understanding how to create secrets

As an administrator you must create a secret before developers can create the pods that depend on that secret.

When creating secrets:

  • Create a secret object with secret data.

  • Update the pod’s service account to allow the reference to the secret.

  • Create a pod, which consumes the secret as an environment variable or as a file (using a secret volume).

Secret creation restrictions

To use a secret, a pod needs to reference the secret. A secret can be used with a pod in three ways:

  • To populate environment variables for containers.

  • As files in a volume mounted on one or more of its containers.

  • By kubelet when pulling images for the pod.

Volume type secrets write data into the container as a file using the volume mechanism. Image pull secrets use service accounts for the automatic injection of the secret into all pods in a namespaces.

When a template contains a secret definition, the only way for the template to use the provided secret is to ensure that the secret volume sources are validated and that the specified object reference actually points to a Secret object. Therefore, a secret needs to be created before any pods that depend on it. The most effective way to ensure this is to have it get injected automatically through the use of a service account.

Secret API objects reside in a namespace. They can only be referenced by pods in that same namespace.

Individual secrets are limited to 1MB in size. This is to discourage the creation of large secrets that could exhaust apiserver and kubelet memory. However, creation of a number of smaller secrets could also exhaust memory.

Creating an opaque secret

As an administrator, you can create a opaque secret, which allows for unstructured key:value pairs that can contain arbitrary values.

Procedure

  1. Create a Secret object in a YAML file on master.

    For example:

    1. apiVersion: v1
    2. kind: Secret
    3. metadata:
    4. name: mysecret
    5. type: Opaque (1)
    6. data:
    7. username: dXNlci1uYW1l
    8. password: cGFzc3dvcmQ=
    1Specifies an opaque secret.
  2. Use the following command to create a Secret object:

    1. $ oc create -f <filename>
  3. To use the secret in a pod:

    1. Update the service account for the pod where you want to use the secret to allow the reference to the secret.

    2. Create the pod, which consumes the secret as an environment variable or as a file (using a secret volume).

Understanding how to update secrets

When you modify the value of a secret, the value (used by an already running pod) will not dynamically change. To change a secret, you must delete the original pod and create a new pod (perhaps with an identical PodSpec).

Updating a secret follows the same workflow as deploying a new Container image. You can use the kubectl rolling-update command.

The resourceVersion value in a secret is not specified when it is referenced. Therefore, if a secret is updated at the same time as pods are starting, then the version of the secret will be used for the pod will not be defined.

Currently, it is not possible to check the resource version of a secret object that was used when a pod was created. It is planned that pods will report this information, so that a controller could restart ones using a old resourceVersion. In the interim, do not update the data of existing secrets, but create new ones with distinct names.

About using signed certificates with secrets

To secure communication to your service, you can configure OKD to generate a signed serving certificate/key pair that you can add into a secret in a project.

A service serving certificate secret is intended to support complex middleware applications that need out-of-the-box certificates. It has the same settings as the server certificates generated by the administrator tooling for nodes and masters.

Service Pod spec configured for a service serving certificates secret.

  1. apiVersion: v1
  2. kind: Service
  3. metadata:
  4. name: registry
  5. annotations:
  6. service.alpha.openshift.io/serving-cert-secret-name: registry-cert(1)
  7. # ...
1Specify the name for the certificate

Other pods can trust cluster-created certificates (which are only signed for internal DNS names), by using the CA bundle in the /var/run/secrets/kubernetes.io/serviceaccount/service-ca.crt file that is automatically mounted in their pod.

The signature algorithm for this feature is x509.SHA256WithRSA. To manually rotate, delete the generated secret. A new certificate is created.

Generating signed certificates for use with secrets

To use a signed serving certificate/key pair with a pod, create or edit the service to add the service.alpha.openshift.io/serving-cert-secret-name annotation, then add the secret to the pod.

Procedure

To create a service serving certificate secret:

  1. Edit the Pod spec for your service.

  2. Add the service.alpha.openshift.io/serving-cert-secret-name annotation with the name you want to use for your secret.

    1. kind: Service
    2. apiVersion: v1
    3. metadata:
    4. name: my-service
    5. annotations:
    6. service.alpha.openshift.io/serving-cert-secret-name: my-cert (1)
    7. spec:
    8. selector:
    9. app: MyApp
    10. ports:
    11. - protocol: TCP
    12. port: 80
    13. targetPort: 9376

    The certificate and key are in PEM format, stored in tls.crt and tls.key respectively.

  3. Create the service:

    1. $ oc create -f <file-name>.yaml
  4. View the secret to make sure it was created:

    1. View a list of all secrets:

      1. $ oc get secrets

      Example output

      1. NAME TYPE DATA AGE
      2. my-cert kubernetes.io/tls 2 9m
    2. View details on your secret:

      1. $ oc describe secret my-cert

      Example output

      1. Name: my-cert
      2. Namespace: openshift-console
      3. Labels: <none>
      4. Annotations: service.alpha.openshift.io/expiry: 2023-03-08T23:22:40Z
      5. service.alpha.openshift.io/originating-service-name: my-service
      6. service.alpha.openshift.io/originating-service-uid: 640f0ec3-afc2-4380-bf31-a8c784846a11
      7. service.beta.openshift.io/expiry: 2023-03-08T23:22:40Z
      8. Type: kubernetes.io/tls
      9. Data
      10. ====
      11. tls.key: 1679 bytes
      12. tls.crt: 2595 bytes
  5. Edit your Pod spec with that secret.

    1. apiVersion: v1
    2. kind: Pod
    3. metadata:
    4. name: my-service-pod
    5. spec:
    6. containers:
    7. - name: mypod
    8. image: redis
    9. volumeMounts:
    10. - name: foo
    11. mountPath: "/etc/foo"
    12. volumes:
    13. - name: foo
    14. secret:
    15. secretName: my-cert
    16. items:
    17. - key: username
    18. path: my-group/my-username
    19. mode: 511

    When it is available, your pod will run. The certificate will be good for the internal service DNS name, <service.name>.<service.namespace>.svc.

    The certificate/key pair is automatically replaced when it gets close to expiration. View the expiration date in the service.alpha.openshift.io/expiry annotation on the secret, which is in RFC3339 format.

    In most cases, the service DNS name <service.name>.<service.namespace>.svc is not externally routable. The primary use of <service.name>.<service.namespace>.svc is for intracluster or intraservice communication, and with re-encrypt routes.

Troubleshooting secrets

If a service certificate generation fails with (service’s service.alpha.openshift.io/serving-cert-generation-error annotation contains):

  1. secret/ssl-key references serviceUID 62ad25ca-d703-11e6-9d6f-0e9c0057b608, which does not match 77b6dd80-d716-11e6-9d6f-0e9c0057b60

The service that generated the certificate no longer exists, or has a different serviceUID. You must force certificates regeneration by removing the old secret, and clearing the following annotations on the service service.alpha.openshift.io/serving-cert-generation-error, service.alpha.openshift.io/serving-cert-generation-error-num:

  1. Delete the secret:

    1. $ oc delete secret <secret_name>
  2. Clear the annotations:

    1. $ oc annotate service <service_name> service.alpha.openshift.io/serving-cert-generation-error-
    1. $ oc annotate service <service_name> service.alpha.openshift.io/serving-cert-generation-error-num-

The command removing annotation has a - after the annotation name to be removed.