MinIO Bitnami Configuration

This directory contains configuration and policies for MinIO deployed using the Bitnami Helm chart.

Files

values.yaml - Helm chart values for MinIO deployment
monitoring.yaml - Monitoring configuration
minio-admins.json - Full admin access policy
minio-users.json - Standard user access policy

Creating New Policies

MinIO uses IAM-style policies (similar to AWS S3) to control access to buckets and objects.

1. Create Policy JSON File

Create a new JSON file with your policy definition:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject",
        "s3:ListBucket"
      ],
      "Resource": [
        "arn:aws:s3:::my-bucket/*",
        "arn:aws:s3:::my-bucket"
      ]
    }
  ]
}

Common Actions:

s3:* - All actions (full access)
s3:GetObject - Read objects
s3:PutObject - Write/upload objects
s3:DeleteObject - Delete objects
s3:ListBucket - List bucket contents
s3:GetBucketLocation - Get bucket location
s3:ListAllMyBuckets - List all buckets

Resource Patterns:

arn:aws:s3:::* - All buckets and objects
arn:aws:s3:::my-bucket - Specific bucket
arn:aws:s3:::my-bucket/* - All objects in a bucket
arn:aws:s3:::my-bucket/prefix/* - Objects with prefix

2. Apply Policy Using MinIO Client (mc)

# Configure mc alias (one-time setup)
mc alias set myminio https://minio.example.com ACCESS_KEY SECRET_KEY

# Create the policy
mc admin policy create myminio policy-name path/to/policy.json

# List all policies
mc admin policy list myminio

# View policy details
mc admin policy info myminio policy-name

# Remove a policy
mc admin policy remove myminio policy-name

3. Assign Policy to Users or Groups

# Assign policy to a user
mc admin policy attach myminio policy-name --user username

# Assign policy to a group
mc admin policy attach myminio policy-name --group groupname

# List user policies
mc admin user info myminio username

Example Policies

Read-Only Access to Specific Bucket

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject",
        "s3:ListBucket"
      ],
      "Resource": [
        "arn:aws:s3:::my-bucket",
        "arn:aws:s3:::my-bucket/*"
      ]
    }
  ]
}

Read-Write Access to Specific Prefix

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject",
        "s3:PutObject",
        "s3:DeleteObject"
      ],
      "Resource": [
        "arn:aws:s3:::my-bucket/uploads/*"
      ]
    },
    {
      "Effect": "Allow",
      "Action": [
        "s3:ListBucket"
      ],
      "Resource": [
        "arn:aws:s3:::my-bucket"
      ],
      "Condition": {
        "StringLike": {
          "s3:prefix": ["uploads/*"]
        }
      }
    }
  ]
}

Multiple Buckets with Different Permissions

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:GetObject",
        "s3:ListBucket"
      ],
      "Resource": [
        "arn:aws:s3:::public-bucket",
        "arn:aws:s3:::public-bucket/*"
      ]
    },
    {
      "Effect": "Allow",
      "Action": [
        "s3:*"
      ],
      "Resource": [
        "arn:aws:s3:::private-bucket",
        "arn:aws:s3:::private-bucket/*"
      ]
    }
  ]
}

Tips

Always test policies with a test user before applying to production
Use mc admin policy info to verify policy is correctly formatted
Policies are applied immediately - no restart required
Users can have multiple policies attached
More specific policies take precedence over general ones
Use groups to manage policies for multiple users efficiently

Troubleshooting

Policy not taking effect:

Verify user/group has policy attached: mc admin user info myminio username
Check MinIO server logs for policy evaluation errors
Ensure bucket/prefix names match exactly (case-sensitive)

Access denied errors:

Verify resource ARN matches the bucket/object pattern
Check if actions include the operation being performed
Ensure both bucket-level and object-level permissions are set

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