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130 lines
4.8 KiB
Markdown
130 lines
4.8 KiB
Markdown
# Compression Guide [](https://slack.min.io)
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MinIO server allows streaming compression to ensure efficient disk space usage.
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Compression happens inflight, i.e objects are compressed before being written to disk(s).
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MinIO uses [`klauspost/compress/s2`](https://github.com/klauspost/compress/tree/master/s2)
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streaming compression due to its stability and performance.
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This algorithm is specifically optimized for machine generated content.
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Write throughput is typically at least 500MB/s per CPU core,
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and scales with the number of available CPU cores.
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Decompression speed is typically at least 1GB/s.
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This means that in cases where raw IO is below these numbers
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compression will not only reduce disk usage but also help increase system throughput.
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Typically, enabling compression on spinning disk systems
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will increase speed when the content can be compressed.
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## Get Started
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### 1. Prerequisites
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Install MinIO - [MinIO Quickstart Guide](https://min.io/docs/minio/linux/index.html#quickstart-for-linux).
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### 2. Run MinIO with compression
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Compression can be enabled by updating the `compress` config settings for MinIO server config.
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Config `compress` settings take extensions and mime-types to be compressed.
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```bash
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~ mc admin config get myminio compression
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compression extensions=".txt,.log,.csv,.json,.tar,.xml,.bin" mime_types="text/*,application/json,application/xml"
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```
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Default config includes most common highly compressible content extensions and mime-types.
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```bash
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~ mc admin config set myminio compression extensions=".pdf" mime_types="application/pdf"
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```
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To show help on setting compression config values.
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```bash
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~ mc admin config set myminio compression
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```
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To enable compression for all content, no matter the extension and content type
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(except for the default excluded types) set BOTH extensions and mime types to empty.
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```bash
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~ mc admin config set myminio compression enable="on" extensions="" mime_types=""
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```
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The compression settings may also be set through environment variables.
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When set, environment variables override the defined `compress` config settings in the server config.
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```bash
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export MINIO_COMPRESSION_ENABLE="on"
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export MINIO_COMPRESSION_EXTENSIONS=".txt,.log,.csv,.json,.tar,.xml,.bin"
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export MINIO_COMPRESSION_MIME_TYPES="text/*,application/json,application/xml"
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```
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### 3. Compression + Encryption
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Combining encryption and compression is not safe in all setups.
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This is particularly so if the compression ratio of your content reveals information about it.
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See [CRIME TLS](https://en.wikipedia.org/wiki/CRIME) as an example of this.
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Therefore, compression is disabled when encrypting by default, and must be enabled separately.
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Consult our security experts on [SUBNET](https://min.io/pricing) to help you evaluate if
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your setup can use this feature combination safely.
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To enable compression+encryption use:
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```bash
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~ mc admin config set myminio compression allow_encryption=on
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```
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Or alternatively through the environment variable `MINIO_COMPRESSION_ALLOW_ENCRYPTION=on`.
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### 4. Excluded Types
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- Already compressed objects are not fit for compression since they do not have compressible patterns.
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Such objects do not produce efficient [`LZ compression`](https://en.wikipedia.org/wiki/LZ77_and_LZ78)
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which is a fitness factor for a lossless data compression.
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Pre-compressed input typically compresses in excess of 2GiB/s per core,
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so performance impact should be minimal even if precompressed data is re-compressed.
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Decompressing incompressible data has no significant performance impact.
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Below is a list of common files and content-types which are typically not suitable for compression.
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- Extensions
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| `gz` | (GZIP) |
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| `bz2` | (BZIP2) |
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| `rar` | (WinRAR) |
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| `zip` | (ZIP) |
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| `7z` | (7-Zip) |
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| `xz` | (LZMA) |
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| `mp4` | (MP4) |
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| `mkv` | (MKV media) |
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| `mov` | (MOV) |
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- Content-Types
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| `video/*` |
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| `audio/*` |
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| `application/zip` |
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| `application/x-gzip` |
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| `application/zip` |
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| `application/x-bz2` |
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| `application/x-compress` |
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| `application/x-xz` |
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All files with these extensions and mime types are excluded from compression,
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even if compression is enabled for all types.
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## To test the setup
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To test this setup, practice put calls to the server using `mc` and use `mc ls` on
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the data directory to view the size of the object.
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## Explore Further
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- [Use `mc` with MinIO Server](https://min.io/docs/minio/linux/reference/minio-mc.html)
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- [Use `aws-cli` with MinIO Server](https://min.io/docs/minio/linux/integrations/aws-cli-with-minio.html)
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- [Use `minio-go` SDK with MinIO Server](https://min.io/docs/minio/linux/developers/go/minio-go.html)
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- [The MinIO documentation website](https://min.io/docs/minio/linux/index.html)
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