By default, Harbor does not ship with certificates. It is possible to deploy Harbor without security, so that you can connect to it over HTTP. However, using HTTP is acceptable only in air-gapped test or development environments that do not have a connection to the external internet. Using HTTP in environments that are not air-gapped exposes you to man-in-the-middle attacks. In production environments, always use HTTPS. If you enable Content Trust with Notary to properly sign all images, you must use HTTPS.
To configure HTTPS, you must create SSL certificates. You can use certificates that are signed by a trusted third-party CA, or you can use self-signed certificates. This section describes how to use
OpenSSL to create a CA, and how to use your CA to sign a server certificate and a client certificate. You can use other CA providers, for example
The procedures below assume that your Harbor registry’s hostname is yourdomain.com, and that its DNS record points to the host on which you are running Harbor.
Generate a Certificate Authority Certificate
In a production environment, you should obtain a certificate from a CA. In a test or development environment, you can generate your own CA. To generate a CA certficate, run the following commands.
Generate a CA certificate private key.
openssl genrsa -out ca.key 4096
Generate the CA certificate.
Adapt the values in the -subj option to reflect your organization. If you use an FQDN to connect your Harbor host, you must specify it as the common name (CN) attribute.
The certificate usually contains a .crt file and a .key file, for example, yourdomain.com.crt and yourdomain.com.key.
Generate a private key.
openssl genrsa -out yourdomain.com.key 4096
Generate a certificate signing request (CSR).
Adapt the values in the -subj option to reflect your organization. If you use an FQDN to connect your Harbor host, you must specify it as the common name (CN) attribute and use it in the key and CSR filenames.
Regardless of whether you’re using either an FQDN or an IP address to connect to your Harbor host, you must create this file so that you can generate a certificate for your Harbor host that complies with the Subject Alternative Name (SAN) and x509 v3 extension requirements. Replace the DNS entries to reflect your domain.
The following example illustrates a configuration that uses custom certificates.
├── yourdomain.com.cert <-- Server certificate signed by CA
├── yourdomain.com.key <-- Server key signed by CA
└── ca.crt <-- Certificate authority that signed the registry certificate
Deploy or Reconfigure Harbor
If you have not yet deployed Harbor, see
Configure the Harbor YML File for information about how to configure Harbor to use the certificates by specifying the hostname and https attributes in harbor.yml.
If you already deployed Harbor with HTTP and want to reconfigure it to use HTTPS, perform the following steps.
Run the prepare script to enable HTTPS.
Harbor uses an nginx instance as a reverse proxy for all services. You use the prepare script to configure nginx to use HTTPS. The prepare is in the Harbor installer bundle, at the same level as the install.sh script.
If Harbor is running, stop and remove the existing instance.
Your image data remains in the file system, so no data is lost.
docker-compose down -v
docker-compose up -d
Verify the HTTPS Connection
After setting up HTTPS for Harbor, you can verify the HTTPS connection by performing the following steps.
Some browsers might show a warning stating that the Certificate Authority (CA) is unknown. This happens when using a self-signed CA that is not from a trusted third-party CA. You can import the CA to the browser to remove the warning.
On a machine that runs the Docker daemon, check the /etc/docker/daemon.json file to make sure that the -insecure-registry option is not set for https://yourdomain.com.
Log into Harbor from the Docker client.
docker login yourdomain.com
If you’ve mapped nginx 443 port to a different port,add the port in the login command.