# MinIO Server Config Guide [![Slack](https://slack.min.io/slack?type=svg)](https://slack.min.io) [![Go Report Card](https://goreportcard.com/badge/minio/minio)](https://goreportcard.com/report/minio/minio) [![Docker Pulls](https://img.shields.io/docker/pulls/minio/minio.svg?maxAge=604800)](https://hub.docker.com/r/minio/minio/)

## Configuration Directory

Till MinIO release `RELEASE.2018-08-02T23-11-36Z`, MinIO server configuration file (`config.json`) was stored in the configuration directory specified by `--config-dir` or defaulted to `${HOME}/.minio`. However from releases after `RELEASE.2018-08-18T03-49-57Z`, the configuration file (only), has been migrated to the storage backend (storage backend is the directory passed to MinIO server while starting the server).

You can specify the location of your existing config using `--config-dir`, MinIO will migrate the `config.json` to your backend storage. Your current `config.json` will be renamed upon successful migration as `config.json.deprecated` in your current `--config-dir`. All your existing configurations are honored after this migration.

Additionally `--config-dir` is now a legacy option which will is scheduled for removal in future, so please update your local startup, ansible scripts accordingly.

```sh
minio server /data
```

### Certificate Directory

TLS certificates by default are stored under ``${HOME}/.minio/certs`` directory. You need to place certificates here to enable `HTTPS` based access. Read more about [How to secure access to MinIO server with TLS](https://docs.min.io/docs/how-to-secure-access-to-minio-server-with-tls).

Following is the directory structure for MinIO server with TLS certificates.

```sh
$ tree ~/.minio
/home/user1/.minio
├── certs
│   ├── CAs
│   ├── private.key
│   └── public.crt
```

You can provide a custom certs directory using `--certs-dir` command line option.

### Accessing configuration file

All configuration changes can be made using [`mc admin config` get/set commands](https://github.com/minio/mc/blob/master/docs/minio-admin-complete-guide.md). Following sections provide brief explanation of fields and how to customize them. A complete example of `config.json` is available [here](https://raw.githubusercontent.com/minio/minio/master/docs/config/config.sample.json)

#### Editing configuration file fields

##### Get current configuration for MinIO deployment

```sh
$ mc admin config get myminio/ > /tmp/myconfig
```

##### Set current configuration for MinIO deployment

```sh
$ mc admin config set myminio < /tmp/myconfig
```

The `mc admin` config API will evolve soon to be able to configure specific fields using get/set commands.

#### Version

|Field|Type|Description|
|:---|:---|:---|
|``version``|_string_| `version` determines the configuration file format. Any older version will automatically be migrated to the latest version upon startup. [DO NOT EDIT THIS FIELD MANUALLY]|

#### Credential

|Field|Type|Description|
|:---|:---|:---|
|``credential``| | Auth credential for object storage and web access.|
|``credential.accessKey`` | _string_ | Access key of minimum 3 characters in length. You may override this field with `MINIO_ACCESS_KEY` environment variable.|
|``credential.secretKey`` | _string_ | Secret key of minimum 8 characters in length. You may override this field with `MINIO_SECRET_KEY` environment variable.|

> NOTE: In distributed setup it is mandatory to use environment variables `MINIO_ACCESS_KEY` and `MINIO_SECRET_KEY` for credentials.

Example:

```sh
export MINIO_ACCESS_KEY=admin
export MINIO_SECRET_KEY=password
minio server /data
```

#### Region

|Field|Type|Description|
|:---|:---|:---|
|``region``| _string_ | `region` describes the physical location of the server. By default it is blank. You may override this field with `MINIO_REGION` environment variable. If you are unsure leave it unset.|

Example:

```sh
export MINIO_REGION="my_region"
minio server /data
```

#### Worm

|Field|Type|Description|
|:---|:---|:---|
|``worm``| _string_ | Enable this to turn on Write-Once-Read-Many. By default it is set to `off`. You may override this field with ``MINIO_WORM`` environment variable.|

Example:

```sh
export MINIO_WORM=on
minio server /data
```

### Storage Class

|Field|Type|Description|
|:---|:---|:---|
|``storageclass``| | Set storage class for configurable data and parity, as per object basis.|
|``storageclass.standard`` | _string_ | Value for standard storage class. It should be in the format `EC:Parity`, for example to set 4 disk parity for standard storage class objects, set this field to `EC:4`.|
|``storageclass.rrs`` | _string_ |  Value for reduced redundancy storage class. It should be in the format `EC:Parity`, for example to set 3 disk parity for reduced redundancy storage class objects, set this field to `EC:3`.|

By default, parity for objects with standard storage class is set to `N/2`, and parity for objects with reduced redundancy storage class objects is set to `2`. Read more about storage class support in MinIO server [here](https://github.com/minio/minio/blob/master/docs/erasure/storage-class/README.md).

### Cache

|Field|Type|Description|
|:---|:---|:---|
|``drives``| _[]string_ | List of mounted file system drives with [`atime`](http://kerolasa.github.io/filetimes.html) support enabled|
|``exclude`` | _[]string_ | List of wildcard patterns for prefixes to exclude from cache |
|``expiry`` | _int_ | Days to cache expiry |
|``maxuse`` | _int_ | Percentage of disk available to cache |

#### Notify

|Field|Type|Description|
|:---|:---|:---|
|``notify``| |Notify enables bucket notification events for lambda computing via the following targets.|
|``notify.amqp``| |[Configure to publish MinIO events via AMQP target.](https://docs.min.io/docs/minio-bucket-notification-guide#AMQP)|
|``notify.nats``| |[Configure to publish MinIO events via NATS target.](https://docs.min.io/docs/minio-bucket-notification-guide#NATS)|
|``notify.elasticsearch``| |[Configure to publish MinIO events via Elasticsearch target.](https://docs.min.io/docs/minio-bucket-notification-guide#Elasticsearch)|
|``notify.redis``| |[Configure to publish MinIO events via Redis target.](https://docs.min.io/docs/minio-bucket-notification-guide#Redis)|
|``notify.postgresql``| |[Configure to publish MinIO events via PostgreSQL target.](https://docs.min.io/docs/minio-bucket-notification-guide#PostgreSQL)|
|``notify.kafka``| |[Configure to publish MinIO events via Apache Kafka target.](https://docs.min.io/docs/minio-bucket-notification-guide#apache-kafka)|
|``notify.webhook``| |[Configure to publish MinIO events via Webhooks target.](https://docs.min.io/docs/minio-bucket-notification-guide#webhooks)|
|``notify.mysql``| |[Configure to publish MinIO events via MySql target.](https://docs.min.io/docs/minio-bucket-notification-guide#MySQL)|
|``notify.mqtt``| |[Configure to publish MinIO events via MQTT target.](https://docs.min.io/docs/minio-bucket-notification-guide#MQTT)|

## Environment only settings

### Browser

Enable or disable access to web UI. By default it is set to `on`. You may override this field with `MINIO_BROWSER` environment variable.

Example:

```sh
export MINIO_BROWSER=off
minio server /data
```

### Domain

By default, MinIO supports path-style requests that are of the format http://mydomain.com/bucket/object. `MINIO_DOMAIN` environment variable is used to enable virtual-host-style requests. If the request `Host` header matches with `(.+).mydomain.com` then the matched pattern `$1` is used as bucket and the path is used as object. More information on path-style and virtual-host-style [here](http://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAPI.html)
Example:

```sh
export MINIO_DOMAIN=mydomain.com
minio server /data
```

For advanced use cases `MINIO_DOMAIN` environment variable supports multiple-domains with comma separated values.
```sh
export MINIO_DOMAIN=sub1.mydomain.com,sub2.mydomain.com
minio server /data
```

### Drive Sync

By default, MinIO writes to disk in synchronous mode for all metadata operations. Set `MINIO_DRIVE_SYNC` environment variable to enable synchronous mode for all data operations as well.

Example:

```sh
export MINIO_DRIVE_SYNC=on
minio server /data
```

### HTTP Trace
HTTP tracing can be enabled by using [`mc admin trace`](https://github.com/minio/mc/blob/master/docs/minio-admin-complete-guide.md#command-trace---display-minio-server-http-trace) command.

Example:
```sh
minio server /data
```

Default trace is succinct only to indicate the API operations being called and the HTTP response status.
```sh
mc admin trace myminio
17:21:45.729309964 objectAPIHandlers.GetBucketLocation localhost:9000/vk-photos/?location= 	200 OK
17:21:45.738167329 objectAPIHandlers.HeadBucket localhost:9000/vk-photos/ 	200 OK
17:21:45.747676811 objectAPIHandlers.ListObjectsV1 localhost:9000/vk-photos/?delimiter=%2F&max-keys=1000&prefix= 	200 OK
```

To trace entire HTTP request
```sh
mc admin trace --verbose myminio
127.0.0.1 [REQUEST objectAPIHandlers.GetBucketLocation] [17:23:21.404025835]
127.0.0.1 GET /yyy/?location=
127.0.0.1 Host: localhost:9000
127.0.0.1 Content-Length: 0
127.0.0.1 User-Agent: MinIO (linux; amd64) minio-go/v6.0.29 mc/2019-06-15T10:29:41Z
127.0.0.1 X-Amz-Content-Sha256: UNSIGNED-PAYLOAD
127.0.0.1 X-Amz-Date: 20190619T172321Z
127.0.0.1 Authorization: AWS4-HMAC-SHA256 Credential=Q3AM3UQ867SPQQA43P2F/20190619/us-east-1/s3/aws4_request, SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature=8e53d8574db3424aa00dd73637575512b250c923edcad3cbf58a727305205709
127.0.0.1
127.0.0.1 [RESPONSE] [17:23:21.404780651]
127.0.0.1 200 OK
127.0.0.1 X-Amz-Request-Id: 15A9A965FF7A7546
127.0.0.1 X-Minio-Deployment-Id: 41e39f4a-3b66-415b-9ddf-025d76a58668
127.0.0.1 X-Xss-Protection: 1; mode=block
127.0.0.1 Accept-Ranges: bytes
127.0.0.1 Server: MinIO/DEVELOPMENT.2019-06-18T17-17-02Z
127.0.0.1 Content-Type: application/xml
127.0.0.1 Vary: Origin
127.0.0.1 X-Amz-Bucket-Region: us-east-1
127.0.0.1 Content-Length: 137
127.0.0.1 Content-Security-Policy: block-all-mixed-content
127.0.0.1 <?xml version="1.0" encoding="UTF-8"?>
<LocationConstraint xmlns="http://s3.amazonaws.com/doc/2006-03-01/">us-east-1</LocationConstraint>127.0.0.1
127.0.0.1 [REQUEST objectAPIHandlers.HeadBucket] [17:23:21.412985428]
127.0.0.1 HEAD /yyy/
127.0.0.1 Host: localhost:9000
127.0.0.1 User-Agent: MinIO (linux; amd64) minio-go/v6.0.29 mc/2019-06-15T10:29:41Z
127.0.0.1 X-Amz-Content-Sha256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
127.0.0.1 X-Amz-Date: 20190619T172321Z
127.0.0.1 Authorization: AWS4-HMAC-SHA256 Credential=Q3AM3UQ867SPQQA43P2F/20190619/us-east-1/s3/aws4_request, SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature=e0a02a62d39994d0206586f01dd2ab3a4aea74e60da9ff4d427629f705c62c02
127.0.0.1 Content-Length: 0
127.0.0.1
127.0.0.1 [RESPONSE] [17:23:21.413457159]
127.0.0.1 200 OK
127.0.0.1 Vary: Origin
127.0.0.1 Accept-Ranges: bytes
127.0.0.1 Content-Length: 0
127.0.0.1 X-Amz-Bucket-Region: us-east-1
127.0.0.1 X-Amz-Request-Id: 15A9A9660005982D
127.0.0.1 X-Minio-Deployment-Id: 41e39f4a-3b66-415b-9ddf-025d76a58668
127.0.0.1 X-Xss-Protection: 1; mode=block
127.0.0.1 Content-Security-Policy: block-all-mixed-content
127.0.0.1 Server: MinIO/DEVELOPMENT.2019-06-18T17-17-02Z
127.0.0.1
127.0.0.1 [REQUEST objectAPIHandlers.ListObjectsV1] [17:23:21.423153668]
127.0.0.1 GET /yyy/?delimiter=%2F&max-keys=1000&prefix=
127.0.0.1 Host: localhost:9000
127.0.0.1 Content-Length: 0
127.0.0.1 User-Agent: MinIO (linux; amd64) minio-go/v6.0.29 mc/2019-06-15T10:29:41Z
127.0.0.1 X-Amz-Content-Sha256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
127.0.0.1 X-Amz-Date: 20190619T172321Z
127.0.0.1 Authorization: AWS4-HMAC-SHA256 Credential=Q3AM3UQ867SPQQA43P2F/20190619/us-east-1/s3/aws4_request, SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature=46ee3d2fc5085432b94bc3205076abd8166ffa3e35c639f84e9684c7c6a181c9
127.0.0.1
127.0.0.1 [RESPONSE] [17:23:21.424260967]
127.0.0.1 200 OK
127.0.0.1 Content-Security-Policy: block-all-mixed-content
127.0.0.1 Content-Type: application/xml
127.0.0.1 Server: MinIO/DEVELOPMENT.2019-06-18T17-17-02Z
127.0.0.1 X-Amz-Bucket-Region: us-east-1
127.0.0.1 X-Minio-Deployment-Id: 41e39f4a-3b66-415b-9ddf-025d76a58668
127.0.0.1 Accept-Ranges: bytes
127.0.0.1 Content-Length: 253
127.0.0.1 Vary: Origin
127.0.0.1 X-Amz-Request-Id: 15A9A966009F94A6
127.0.0.1 X-Xss-Protection: 1; mode=block
127.0.0.1 <?xml version="1.0" encoding="UTF-8"?>
<ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><Name>yyy</Name><Prefix></Prefix><Marker></Marker><MaxKeys>1000</MaxKeys><Delimiter>/</Delimiter><IsTruncated>false</IsTruncated></ListBucketResult>
```

## Explore Further

* [MinIO Quickstart Guide](https://docs.min.io/docs/minio-quickstart-guide)
* [Configure MinIO Server with TLS](https://docs.min.io/docs/how-to-secure-access-to-minio-server-with-tls)