# Environment Variables { #environment-variables }

/// tip

If you already know what "environment variables" are and how to use them, feel free to skip this.

///

An environment variable (also known as "**env var**") is a variable that lives **outside** of the Python code, in the **operating system**, and could be read by your Python code (or by other programs as well).

Mohammad <******@****.***> 1753435623 +0330

To understand environment variables you can read [Environment Variables](../environment-variables.md){.internal-link target=_blank}.

///

## Types and validation { #types-and-validation }

These environment variables can only handle text strings, as they are external to Python and have to be compatible with other programs and the rest of the system (and even with different operating systems, as Linux, Windows, macOS).

    }

    /**
     * Returns a {@link Map} where the keys are the type variables and the values are the type arguments
     * of the specified parameterized type (class or interface).
     *
     * @param clazz
     *            the parameterized type (class or interface) to analyze. Cannot be null.
     * @return a {@link Map} where the keys are the type variables and the values are the type arguments
     */

import java.util.concurrent.atomic.AtomicLong;

/**
 * One or more variables that together maintain an initially zero {@code long} sum. When updates
 * (method {@link #add}) are contended across threads, the set of variables may grow dynamically to
 * reduce contention. Method {@link #sum} (or, equivalently, {@link #longValue}) returns the current
 * total combined across the variables maintaining the sum.
 *

## Overview

MinIO supports two storage classes, Reduced Redundancy class and Standard class. These classes can be defined using environment variables
set before starting MinIO server. After the data and parity drives for each storage class are defined using environment variables,
you can set the storage class of an object via request metadata field `x-amz-storage-class`. MinIO server then honors the storage class by

        super.setUp();
        purgeLogJob = new PurgeLogJob();
    }

    // Test all services execute successfully
    public void test_execute_allSuccess() {
        // Setup tracking variables
        final boolean[] deleteCrawlingInfoCalled = { false };
        final boolean[] deleteSearchLogCalled = { false };
        final boolean[] deleteJobLogCalled = { false };

```bash
~ mc admin config set myminio compression enable="on" extensions="" mime_types=""
```

The compression settings may also be set through environment variables.
When set, environment variables override the defined `compress` config settings in the server config.

```bash
export MINIO_COMPRESSION_ENABLE="on"
export MINIO_COMPRESSION_EXTENSIONS=".txt,.log,.csv,.json,.tar,.xml,.bin"

# Conditional OpenAPI { #conditional-openapi }

If you needed to, you could use settings and environment variables to configure OpenAPI conditionally depending on the environment, and even disable it entirely.

## About security, APIs, and docs { #about-security-apis-and-docs }

Hiding your documentation user interfaces in production *shouldn't* be the way to protect your API.

```

### 8. Configure `mc`

```
mc alias set myminio-newuser http://localhost:9000 newuser newuser123 --api s3v4
mc cat myminio-newuser/my-bucketname/my-objectname
```

### Policy Variables

You can use policy variables in the *Resource* element and in string comparisons in the *Condition* element.