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Use a Secret volume when your application can read a file and should be able to pick up projected Secret updates. Use a Secret-backed environment variable when the application expects process configuration and restarting the container after a Secret change is acceptable. Neither method refreshes an application automatically in every case: volume updates are eventual, and a volume mounted with subPath does not receive automated updates.
What changes between the two methods?
Both methods deliver values from a Kubernetes Secret, but they expose them differently. A volume makes Secret keys available as files at a path inside a container. Environment-variable injection makes selected keys available to the container process under variable names.
| Decision point | Secret volume | Secret environment variable |
|---|---|---|
| How the application reads it | Reads a file from the mounted path. | Reads a named variable from its process environment. |
| What happens after a Secret changes | Kubernetes eventually updates a normal Secret volume projection; propagation depends on kubelet synchronization and Secret caching. | An already-running process retains its existing environment. Restart the container or roll out the workload to load the changed value. |
| Important exception | A subPath mount does not receive automated Secret updates. |
A live process does not automatically receive a refreshed environment variable. |
| Exposure considerations | Read-only files; you can restrict projected keys and set file permissions. The application and users with sufficient node access may still expose the contents. | Convenient process configuration, but Kubernetes warns that environment variables may be more prone to leakage through crash dumps and logs. |
| Node-side storage | Secret volumes use tmpfs and are not written to non-volatile storage by this volume mechanism. | That volume-storage property does not apply to process environment data. |
When should you choose a Secret volume?
Choose a volume if the application already supports reading credentials or configuration from files, or if you want Kubernetes to project Secret changes without immediately recreating the Pod. The projection update is eventual rather than instantaneous, and the application must itself re-open or reload the file to use replacement content. An application that reads the file only once at startup will continue using the value it loaded until it reloads.
Mount only what the container needs
Declare the Secret under .spec.volumes, then mount it for the relevant container under .spec.containers[*].volumeMounts. The volume is read-only. By default, Secret keys appear as files; use items to select specific keys and map them to paths. If you list keys explicitly, every listed key must exist.
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The documented default POSIX file mode is 0644. You can set defaultMode, for example to 0400, but check that the container’s process user can still read the files. See Kubernetes’ credential distribution task and Volumes documentation for manifest details.
Example: mount selected keys as files
apiVersion: v1
kind: Pod
spec:
containers:
- name: app
image: example/app
volumeMounts:
- name: credentials
mountPath: /etc/app/credentials
readOnly: true
volumes:
- name: credentials
secret:
secretName: app-credentials
defaultMode: 0400
items:
- key: username
path: username
- key: password
path: passwordThis makes the selected values available as /etc/app/credentials/username and /etc/app/credentials/password. The Secret must contain both listed keys.
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When should you choose environment variables?
Use environment variables when the application is designed to read configuration from its process environment and you can restart or roll out the workload after a Secret changes. This is often a straightforward fit for applications that accept credentials as startup configuration, but it does not provide live refresh to an already-running process.
Inject one key or several
Use env[].valueFrom.secretKeyRef to expose an individual Secret key. Use envFrom[].secretRef to import key-value pairs from a Secret. Check that keys used as environment-variable names meet Kubernetes’ naming restrictions: invalid names are not made available even though the Pod may start.
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Example: inject an individual key
apiVersion: v1
kind: Pod
spec:
containers:
- name: app
image: example/app
env:
- name: APP_PASSWORD
valueFrom:
secretKeyRef:
name: app-credentials
key: passwordThe application reads the value as APP_PASSWORD. Plan a rollout or restart after changing the Secret so a new process can load the updated value. See the Kubernetes documentation on Secrets.
How should Secret rotation work?
Choose a rotation procedure based on how the application consumes the value, not only on how Kubernetes projects it.
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- For a normal Secret volume: update the Secret, allow time for kubelet synchronization and caching to propagate the change, and ensure the application re-opens or reloads the file.
- For a
subPathmount: recreate or restart the consuming Pod to pick up the changed Secret; automated volume updates do not apply to this mount. - For environment variables: update the Secret and roll out or restart the consuming workload so new processes receive the new value.
Where uninterrupted service matters, design the application and workload rollout around the period when old and new credentials may be in use. Kubernetes’ Secret documentation describes the delivery behavior; the application’s own reload behavior determines when it actually adopts a file update.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What security protections do these methods provide—and what do they not?
A Secret volume is read-only and backed by tmpfs, so that volume mechanism does not write its contents to non-volatile node storage. This is a statement about the mounted volume, not about how the Secret object is stored in the Kubernetes API datastore. Kubernetes stores Secret data unencrypted in etcd by default; base64 encoding is not encryption. Configure encryption at rest and restrict access with least-privilege RBAC.
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Kubernetes’ Security Checklist says environment variables “might be more prone to leakage due to crash dumps in logs and the non-confidential nature of environment variable in Linux, as opposed to the permission mechanism on files.” This is a comparative risk, not a guarantee that mounted files cannot leak. Use file permissions and limit mounted keys or paths where appropriate.
- Give a Secret only to the containers that need it.
- Remember that a user allowed to create a Pod that consumes a Secret may be able to expose that value, even without direct permission to read the Secret object.
- Keep credentials out of application logs and do not transmit them to untrusted destinations.
- Do not treat either delivery method as protection from a compromised process that is authorized to read the value, or from excessive node privileges.
For more on access controls and Secret handling, see Kubernetes’ Good practices for Kubernetes Secrets.
What if you do not want credentials in Kubernetes Secret objects?
Teams that keep credentials in an external store can consider a third-party Secret store provider integrated through the Secrets Store CSI Driver. Kubernetes documentation describes the integration category but does not establish that a particular provider fits a given organization. Check provider support, rotation behavior, cluster compatibility, and program terms before selecting one.
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