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# MinIO Server Config Guide [](https://slack.min.io) [](https://goreportcard.com/report/minio/minio) [](https://hub.docker.com/r/minio/minio/)
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## Configuration Directory
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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 `${HOME}/.minio`. However from releases after `RELEASE.2018-08-18T03-49-57Z`, the configuration file (only), has been migrated to the storage backend (storage backend is the directory passed to MinIO server while starting the server).
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You can specify the location of your existing config using `--config-dir`, MinIO will migrate the `config.json` to your backend storage. Your current `config.json` will be renamed upon successful migration as `config.json.deprecated` in your current `--config-dir`. All your existing configurations are honored after this migration.
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Additionally `--config-dir` is now a legacy option which will is scheduled for removal in future, so please update your local startup, ansible scripts accordingly.
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```sh
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minio server /data
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```
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### Certificate Directory
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TLS certificates by default are stored under ``${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).
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Following is the directory structure for MinIO server with TLS certificates.
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```sh
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$ tree ~/.minio
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/home/user1/.minio
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├── certs
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│ ├── CAs
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│ ├── private.key
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│ └── public.crt
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```
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You can provide a custom certs directory using `--certs-dir` command line option.
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### Accessing configuration file
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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)
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#### Editing configuration file fields
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##### Get current configuration for MinIO deployment
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```sh
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$ mc admin config get myminio/ > /tmp/myconfig
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```
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##### Set current configuration for MinIO deployment
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```sh
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$ mc admin config set myminio < /tmp/myconfig
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```
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The `mc admin` config API will evolve soon to be able to configure specific fields using get/set commands.
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#### Version
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|Field|Type|Description|
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|:---|:---|:---|
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|``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]|
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#### Credential
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|Field|Type|Description|
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|:---|:---|:---|
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|``credential``| | Auth credential for object storage and web access.|
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|``credential.accessKey`` | _string_ | Access key of minimum 3 characters in length. You may override this field with `MINIO_ACCESS_KEY` environment variable.|
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|``credential.secretKey`` | _string_ | Secret key of minimum 8 characters in length. You may override this field with `MINIO_SECRET_KEY` environment variable.|
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> NOTE: In distributed setup it is mandatory to use environment variables `MINIO_ACCESS_KEY` and `MINIO_SECRET_KEY` for credentials.
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Example:
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```sh
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export MINIO_ACCESS_KEY=admin
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export MINIO_SECRET_KEY=password
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minio server /data
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```
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#### Region
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|Field|Type|Description|
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|:---|:---|:---|
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|``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.|
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Example:
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```sh
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export MINIO_REGION="my_region"
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minio server /data
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```
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#### Worm
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|Field|Type|Description|
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|:---|:---|:---|
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|``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.|
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Example:
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```sh
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export MINIO_WORM=on
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minio server /data
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```
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### Storage Class
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|Field|Type|Description|
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|``storageclass``| | Set storage class for configurable data and parity, as per object basis.|
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|``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`.|
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|``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`.|
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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).
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### Cache
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|Field|Type|Description|
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|``drives``| _[]string_ | List of mounted file system drives with [`atime`](http://kerolasa.github.io/filetimes.html) support enabled|
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|``exclude`` | _[]string_ | List of wildcard patterns for prefixes to exclude from cache |
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|``expiry`` | _int_ | Days to cache expiry |
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|``maxuse`` | _int_ | Percentage of disk available to cache |
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#### Notify
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|Field|Type|Description|
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|``notify``| |Notify enables bucket notification events for lambda computing via the following targets.|
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|``notify.amqp``| |[Configure to publish MinIO events via AMQP target.](https://docs.min.io/docs/minio-bucket-notification-guide#AMQP)|
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|``notify.nats``| |[Configure to publish MinIO events via NATS target.](https://docs.min.io/docs/minio-bucket-notification-guide#NATS)|
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|``notify.elasticsearch``| |[Configure to publish MinIO events via Elasticsearch target.](https://docs.min.io/docs/minio-bucket-notification-guide#Elasticsearch)|
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|``notify.redis``| |[Configure to publish MinIO events via Redis target.](https://docs.min.io/docs/minio-bucket-notification-guide#Redis)|
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|``notify.postgresql``| |[Configure to publish MinIO events via PostgreSQL target.](https://docs.min.io/docs/minio-bucket-notification-guide#PostgreSQL)|
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|``notify.kafka``| |[Configure to publish MinIO events via Apache Kafka target.](https://docs.min.io/docs/minio-bucket-notification-guide#apache-kafka)|
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|``notify.webhook``| |[Configure to publish MinIO events via Webhooks target.](https://docs.min.io/docs/minio-bucket-notification-guide#webhooks)|
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|``notify.mysql``| |[Configure to publish MinIO events via MySql target.](https://docs.min.io/docs/minio-bucket-notification-guide#MySQL)|
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|``notify.mqtt``| |[Configure to publish MinIO events via MQTT target.](https://docs.min.io/docs/minio-bucket-notification-guide#MQTT)|
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## Environment only settings
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### Browser
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Enable or disable access to web UI. By default it is set to `on`. You may override this field with `MINIO_BROWSER` environment variable.
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Example:
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```sh
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export MINIO_BROWSER=off
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minio server /data
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```
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### Domain
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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)
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Example:
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```sh
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export MINIO_DOMAIN=mydomain.com
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minio server /data
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```
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For advanced use cases `MINIO_DOMAIN` environment variable supports multiple-domains with comma separated values.
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```sh
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export MINIO_DOMAIN=sub1.mydomain.com,sub2.mydomain.com
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minio server /data
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```
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### Drive Sync
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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.
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Example:
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```sh
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export MINIO_DRIVE_SYNC=on
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minio server /data
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```
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### HTTP Trace
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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.
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Example:
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```sh
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minio server /data
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```
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Default trace is succinct only to indicate the API operations being called and the HTTP response status.
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```sh
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mc admin trace myminio
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17:21:45.729309964 objectAPIHandlers.GetBucketLocation localhost:9000/vk-photos/?location= 200 OK
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17:21:45.738167329 objectAPIHandlers.HeadBucket localhost:9000/vk-photos/ 200 OK
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17:21:45.747676811 objectAPIHandlers.ListObjectsV1 localhost:9000/vk-photos/?delimiter=%2F&max-keys=1000&prefix= 200 OK
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```
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To trace entire HTTP request
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```sh
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mc admin trace --verbose myminio
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127.0.0.1 [REQUEST objectAPIHandlers.GetBucketLocation] [17:23:21.404025835]
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127.0.0.1 GET /yyy/?location=
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127.0.0.1 Host: localhost:9000
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127.0.0.1 Content-Length: 0
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127.0.0.1 User-Agent: MinIO (linux; amd64) minio-go/v6.0.29 mc/2019-06-15T10:29:41Z
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127.0.0.1 X-Amz-Content-Sha256: UNSIGNED-PAYLOAD
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127.0.0.1 X-Amz-Date: 20190619T172321Z
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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
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127.0.0.1
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127.0.0.1 [RESPONSE] [17:23:21.404780651]
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127.0.0.1 200 OK
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127.0.0.1 X-Amz-Request-Id: 15A9A965FF7A7546
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127.0.0.1 X-Minio-Deployment-Id: 41e39f4a-3b66-415b-9ddf-025d76a58668
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127.0.0.1 X-Xss-Protection: 1; mode=block
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127.0.0.1 Accept-Ranges: bytes
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127.0.0.1 Server: MinIO/DEVELOPMENT.2019-06-18T17-17-02Z
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127.0.0.1 Content-Type: application/xml
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127.0.0.1 Vary: Origin
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127.0.0.1 X-Amz-Bucket-Region: us-east-1
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127.0.0.1 Content-Length: 137
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127.0.0.1 Content-Security-Policy: block-all-mixed-content
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127.0.0.1 <?xml version="1.0" encoding="UTF-8"?>
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<LocationConstraint xmlns="http://s3.amazonaws.com/doc/2006-03-01/">us-east-1</LocationConstraint>127.0.0.1
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127.0.0.1 [REQUEST objectAPIHandlers.HeadBucket] [17:23:21.412985428]
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127.0.0.1 HEAD /yyy/
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127.0.0.1 Host: localhost:9000
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127.0.0.1 User-Agent: MinIO (linux; amd64) minio-go/v6.0.29 mc/2019-06-15T10:29:41Z
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127.0.0.1 X-Amz-Content-Sha256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
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127.0.0.1 X-Amz-Date: 20190619T172321Z
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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
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127.0.0.1 Content-Length: 0
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127.0.0.1
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127.0.0.1 [RESPONSE] [17:23:21.413457159]
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127.0.0.1 200 OK
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127.0.0.1 Vary: Origin
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127.0.0.1 Accept-Ranges: bytes
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127.0.0.1 Content-Length: 0
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127.0.0.1 X-Amz-Bucket-Region: us-east-1
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127.0.0.1 X-Amz-Request-Id: 15A9A9660005982D
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127.0.0.1 X-Minio-Deployment-Id: 41e39f4a-3b66-415b-9ddf-025d76a58668
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127.0.0.1 X-Xss-Protection: 1; mode=block
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127.0.0.1 Content-Security-Policy: block-all-mixed-content
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127.0.0.1 Server: MinIO/DEVELOPMENT.2019-06-18T17-17-02Z
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127.0.0.1
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127.0.0.1 [REQUEST objectAPIHandlers.ListObjectsV1] [17:23:21.423153668]
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127.0.0.1 GET /yyy/?delimiter=%2F&max-keys=1000&prefix=
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127.0.0.1 Host: localhost:9000
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127.0.0.1 Content-Length: 0
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127.0.0.1 User-Agent: MinIO (linux; amd64) minio-go/v6.0.29 mc/2019-06-15T10:29:41Z
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127.0.0.1 X-Amz-Content-Sha256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
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127.0.0.1 X-Amz-Date: 20190619T172321Z
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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
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127.0.0.1
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127.0.0.1 [RESPONSE] [17:23:21.424260967]
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127.0.0.1 200 OK
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127.0.0.1 Content-Security-Policy: block-all-mixed-content
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127.0.0.1 Content-Type: application/xml
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127.0.0.1 Server: MinIO/DEVELOPMENT.2019-06-18T17-17-02Z
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127.0.0.1 X-Amz-Bucket-Region: us-east-1
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127.0.0.1 X-Minio-Deployment-Id: 41e39f4a-3b66-415b-9ddf-025d76a58668
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127.0.0.1 Accept-Ranges: bytes
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127.0.0.1 Content-Length: 253
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127.0.0.1 Vary: Origin
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127.0.0.1 X-Amz-Request-Id: 15A9A966009F94A6
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127.0.0.1 X-Xss-Protection: 1; mode=block
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127.0.0.1 <?xml version="1.0" encoding="UTF-8"?>
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<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>
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```
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## Explore Further
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* [MinIO Quickstart Guide](https://docs.min.io/docs/minio-quickstart-guide)
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* [Configure MinIO Server with TLS](https://docs.min.io/docs/how-to-secure-access-to-minio-server-with-tls)
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