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S3 for MinIO

  3 minute read.

Last Modified 2022-05-11 11:36 EDT

MinIO connections and service is configured using the Services S3 screen.

MinIO deprecated Access key and Secret key replacing them respectively with the MINIO_ROOT USER and MINIO_ROOT_PASSWORD arguments and their values. For the ROOT_USER value, use a name up to 20 characters. For the ROOT_PASSWORD, use a string of 8 to 40 randomized characters. MinIO recommends using a long password string of unique random characters.

Testing Minio Connections

When Enable Browser is select, test access to the MinIO Browser by opening a web browser and typing the TrueNAS IP address with the TCP port. The port specified in Port must be allowed through the network firewall to permit bucket creation and file uploads. For example:

MinIO Connection Methods

There are different methods for connecting to and using MinIO:

Linux or macOS users must have the s3cmd service installed before beginning this setup. On Windows, users can also refer to S3Express for a similar command line experience.

Ubuntu or other Linux distributions can access the configuration by running command s3cmd --configure to walk through important settings.

Enter the specified access key and the secret key. Under the S3 Endpoint, enter the TrueNAS IP address followed by TCP port, and reply N to the DNS-style bucket+hostname.

Save the file. On Linux, the default is in the home directory ~/.s3cfg.

If the connection has any issues, open .s3cfg again to troubleshoot. In Ubuntu, use command nano .s3cfg or vi .s3cfg or gedit .s3cfg depending on the preferred text editor. For other operating systems, .s3cfg file location and editing tools may vary.

Scroll down to the host_bucket area and make sure the %(bucket)s. portion is removed and the address points to the IP_address:TCP_port for the system.

Correct Example

host_base = ``
host_bucket = ``

Incorrect Example

host_base = ``
host_bucket = `%(bucket)s.`

Poll the buckets using command s3cmd ls to see the buckets created with the MinIO Browser.

For more information on using MinIO with command s3cmd, see and

On Windows PCs, the S3 Browser is another convenient way to connect to the MinIO S3 on a TrueNAS system.

To set it up, first install the S3 Browser.

After installation completes, add a new account.


In the settings, select S3 Compatible Storage as the Account Type, then enter the MinIO access point similar to the command s3cmd setup (TrueNAS_IP_address:9000 or other port if set differently). Select the SSL settings appropriate for the particular setup. The default assumes SSL in S3 Browser, but for a LAN attached session, this may or may not already be set.


It is possible to access, create new buckets, or upload files to created buckets.


Additional Information

S3 screen