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To deploy a private image in Coolify, create a Docker Image application with the complete image reference, then log the deployment server’s Docker user into the registry under Registries. The registry token is separate from Git credentials. If an image is built elsewhere, the build server needs push access and the Coolify deployment server needs pull access; in Swarm, every eligible node needs access and credentials.
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What Coolify needs to pull a private image
A private-registry deployment has four independent requirements:
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- A complete image name, including its registry host, repository path and tag or digest.
- Registry credentials with permission to pull that repository.
- Credentials saved for the exact server user that Coolify uses to run Docker commands.
- The image’s listening port and any required domain or runtime settings.
Coolify pulls the image on the deployment server. A Git deploy key does not satisfy that pull: it can grant access to source code, but it cannot authenticate Docker to a private container registry.
Connect a private registry through the Coolify interface
1. Create a Docker Image application
- Open the target Project and Environment in Coolify.
- Select + New, then choose Docker Image.
- Enter the complete image reference. For example:
ghcr.io/example/api:1.4.0. - Alternatively, specify a repository with a version tag or a SHA256 digest, such as
ghcr.io/example/api@sha256:<digest>.
Do not enter only a short repository name when the image lives on another registry. The hostname determines where Docker looks and which login entry it uses.
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2. Save registry credentials for the deployment server
Use either location in the Coolify interface:
- Registries in the main sidebar.
- Servers > [server] > Registries for a server-specific setup.
- Select Log in.
- Choose the registry type: Docker Hub, GHCR, GitLab, Google Artifact Registry, Azure ACR, AWS ECR or Custom.
- Enter the registry host, username and password or access token.
- Save the login for the server that will run the application.
Coolify performs the equivalent of docker login for the configured server user. Logging in as your personal shell account does not help if Coolify runs Docker as a different account.
3. Configure the container and deploy
- Set Ports Exposes to the port on which the process inside the image listens.
- Add the application domain and required runtime settings, such as environment variables or persistent storage.
- Select Deploy.
- Open the deployment logs and verify that the image pull, container start and health checks complete.
The exposed port is the container’s internal listening port, not necessarily the public HTTP or HTTPS port. If the process listens on port 8080 inside the image, expose 8080 even when Coolify terminates TLS at the domain.
Log in with SSH when the UI is unavailable
SSH into the server as the same operating-system user that Coolify uses for Docker operations. Then log in to the registry directly:
docker login <registry-domain>For a token, avoid putting the secret in shell history by piping it through standard input:
printf '%s' "$REGISTRY_TOKEN" | docker login <registry-domain> --username <username> --password-stdinAfter a successful login, Docker writes the credential entry to that user’s ~/.docker/config.json. Return to Coolify and redeploy the Docker Image application so the deployment uses the updated authentication.
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Git credentials and registry credentials are different
Coolify can use Git credentials to clone a private repository, but those credentials do not grant access to a private image. A deploy key cannot authenticate Docker to a private container registry.
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|---|---|---|
| Git deploy key or repository token | Cloning source code and related Git operations | Source retrieval during a build |
| Registry username and password/token | Pulling images; pushing as well only when the token has push permission | Docker commands on the relevant server |
Use a registry token with the smallest scope that matches the job. A deployment-only server generally needs pull permission. A build server that publishes images needs push permission in addition to any pull permission required by its workflow.
Where Coolify stores the login and why the server user matters
Docker stores registry credentials in the server user’s ~/.docker/config.json. Coolify’s documentation describes these credentials as encoded, not encrypted. Protect the operating-system account, restrict access to the file, and treat the token as a secret that can be revoked and rotated.
The login is tied to both a registry hostname and a Unix user. These examples are different authentication contexts:
/home/deploy/.docker/config.jsonused by a Coolify Docker command./root/.docker/config.jsoncreated by an administrator testing a pull as root.
A successful pull in the second context does not prove that Coolify can pull in the first. Always test with the same account and on the same server that performs the deployment.
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Use tags and digests deliberately
Version tags
A tag such as ghcr.io/example/api:1.4.0 is easy to read and works well when your release process treats version tags as immutable. It makes deployment logs and rollback decisions understandable.
SHA256 digests
A reference such as ghcr.io/example/api@sha256:<digest> identifies fixed image content. It is the strongest choice when you need a deployment to run exactly the bytes that were verified or promoted.
The risk of latest
A mutable tag such as latest can point to different content on a later deployment or restart. That can make an apparently identical Coolify configuration run a different image. When investigating a changed deployment, replace a mutable tag with a version tag or digest so the image content is no longer moving.
| Reference style | Readability | Content stability | Best use |
|---|---|---|---|
Mutable tag, such as latest |
High | Can change between pulls | Only when moving content is intentional |
Version tag, such as 1.4.0 |
High | Stable if your release policy keeps it immutable | Routine releases and human-readable rollbacks |
| SHA256 digest | Lower | Fixed to one image content address | Audited, reproducible and forensic deployments |
Authenticate every machine in the delivery path
One deployment server
For a prebuilt image pulled directly by one Coolify server, log in on that deployment server. The token must have pull permission for the exact repository path. No separate build-server login is needed unless that server also publishes or otherwise pulls the image.
Separate build and deployment servers
When an image is built on one machine and deployed from another, each role has its own registry operation:
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| Machine | Operation | Minimum registry permission |
|---|---|---|
| Build server | Pushes the completed image and may pull base images | Push permission for the target repository; pull permission for any private bases |
| Coolify deployment server | Pulls the completed image to start the application | Pull permission for the target repository |
Logging in on the build server does not transfer authentication to the deployment server. Configure and test both logins, preferably with separate tokens so that either role can be revoked without interrupting the other.
Docker Swarm
In a Swarm deployment, any manager or worker that may run the service must be able to resolve the registry hostname, reach it over the network and authenticate. A pull that succeeds on the manager is not enough if a worker later receives the task.
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- Identify every eligible node for the application.
- Confirm DNS resolution and network connectivity to the registry from each node.
- Log in to the registry on each node using the Docker user that will run the service.
- Run a test pull of the exact image reference on each node.
- Deploy or update the service, then inspect task placement and logs.
If a task repeatedly fails after being scheduled on a particular worker, compare that node’s registry login, hostname resolution and network path with a node where the pull succeeds.
Comparison: choose the registry arrangement that fits the deployment
| Arrangement | Authentication pattern | Operational considerations |
|---|---|---|
| External registry, pull-only deployment | Deployment server logs in with a pull-scoped token | Smallest permission set and simplest runtime path |
| External registry, build plus deployment | Build server authenticates to push; deployment server authenticates to pull | Two machines, two tests and preferably separate tokens |
| Single-host deployment | One server user needs the registry login | Verify the exact Coolify Docker user rather than an administrator account |
| Swarm deployment | Every eligible manager and worker needs reachability and credentials | Node-by-node testing is required before relying on scheduling |
| Coolify-hosted registry | Every pushing or pulling server logs in to the registry domain | You own storage, backups, retention and registry availability |
Host a private registry as a Coolify service
Coolify provides a one-click Docker Registry service for teams that want to run the registry alongside their other services. The current template runs registry:3.
How the service is initialized
- Service variables provide the registry credentials.
- The startup process generates an
htpasswdfile from those variables. - Images are stored in a persistent volume named
registry-data. - A public domain is configured for the registry endpoint.
After the service is available, use the generated username and password with:
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docker login <registry-domain>Run that login on every server that must push or pull. The registry domain, credentials and image path must match the references entered in Coolify.
Storage and recovery responsibilities
Include registry-data in backups. Decide how long old image layers and tags should be retained, monitor disk growth and document how to restore the volume and credentials. A registry service can be running while a full disk prevents new pushes, so storage capacity and retention are part of the deployment design rather than an optional cleanup task.
Troubleshoot “unauthorized” and image-pull failures
Check the image reference first
Compare the hostname, repository path, separator and tag character by character. An authenticated token for ghcr.io/example/api does not help if the application requests another hostname or repository path. For diagnosis, use a known version tag or digest instead of latest.
Check token permissions and scope
Confirm that the token is allowed to pull the repository. If the same machine builds and publishes the image, confirm push permission as well. A token that can read source code or packages in one location may still lack permission for the specific container repository.
Check the Coolify server and user
Verify that the login was saved under the server selected by the application and for the user Coolify uses to execute Docker. Test the exact image with that account. Do not rely on a pull performed as root or by a different deployment account.
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If the workflow uses a separate build server, confirm both roles independently: the builder must authenticate before pushing, and the deployment server must authenticate before pulling. A successful push proves only that the builder can publish; it says nothing about the deployment server’s pull credentials.
Check Swarm nodes
For Swarm, test DNS, network reachability and docker pull on every manager and worker that can receive the application. Remove a node from eligibility, fix its credentials or network path, and retest before allowing it to run the service.
Check the container port after authentication succeeds
An image can pull successfully and still appear unavailable when Ports Exposes does not match the process’s internal listening port. Inspect the container logs to identify the listening address and port, then update the Coolify setting and redeploy.
Quick Recap
A repeatable verification checklist
- Image reference includes the correct registry hostname, repository path and immutable tag or digest where appropriate.
- Registry token has pull permission; build tokens also have the required push permission.
- Login was performed for the server and operating-system user used by Coolify.
- Separate build and deployment servers have separate, tested authentication when both roles exist.
- Every eligible Swarm node can resolve and reach the registry and pull the exact image.
- Ports Exposes matches the process’s internal listening port.
- Deployment logs show a successful pull and container start.
- For a Coolify-hosted registry, the public domain works,
registry-datais persistent, backups include that volume and retention is documented.
Security and maintenance practices
- Prefer pull-only tokens on deployment servers and reserve push permission for build systems that need it.
- Rotate registry tokens on a schedule and after suspected exposure; update every machine that uses the old credential.
- Limit access to the server user’s Docker configuration because its contents are encoded rather than encrypted.
- Use version tags or digests to make rollbacks and incident analysis deterministic.
- Keep registry storage backed up and monitor retention so old layers do not consume the service volume unexpectedly.
- When changing registry hosts, update the image reference and the corresponding login entry together; authenticating to the old host does not authorize the new one.
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