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106 lines
4.5 KiB
Markdown
106 lines
4.5 KiB
Markdown
# Compression Guide [](https://slack.min.io)
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MinIO server allows streaming compression to ensure efficient disk space usage. Compression happens inflight, i.e objects are compressed before being written to disk(s). MinIO uses [`klauspost/compress/s2`](https://github.com/klauspost/compress/tree/master/s2) streaming compression due to its stability and performance.
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This algorithm is specifically optimized for machine generated content. Write throughput is typically at least 300MB/s per CPU core. Decompression speed is typically at least 1GB/s.
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This means that in cases where raw IO is below these numbers compression will not only reduce disk usage but also help increase system throughput.
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Typically enabling compression on spinning disk systems 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://docs.min.io/docs/minio-quickstart-guide).
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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. Config `compress` settings take extensions and mime-types to be compressed.
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```json
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"compress": {
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"enabled": true,
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"extensions": [".txt",".log",".csv", ".json", ".tar"],
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"mime-types": ["text/*","application/json","application/xml"]
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}
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```
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Since text, log, csv, json files are highly compressible, These extensions/mime-types are included by default for compression.
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Having compression enabled and no extensions or mime types will attempt to compress anything that isn't explicitly known to be already compressed content.
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Settings for enabling compression on all content, except for types listed below:
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```json
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"compress": {
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"enabled": true,
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"extensions": [],
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"mime-types": []
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}
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```
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Incompressible content will be skipped with quite low CPU usage and storage overhead, typically at several GB/s.
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To update the configuration, use `mc admin config get` command to get the current configuration file for the minio cluster in json format, and save it locally.
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```sh
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$ mc admin config get myminio/ > /tmp/myconfig
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```
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After updating the compression configuration in /tmp/myconfig , use `mc admin config set` command to update the configuration for the cluster. Restart the MinIO server to put the changes into effect.
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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 compression settings may also be set through environment variables. 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_COMPRESS="true"
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export MINIO_COMPRESS_EXTENSIONS=".pdf,.doc"
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export MINIO_COMPRESS_MIMETYPES="application/pdf"
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```
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### 3. Note
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- Already compressed objects are not fit for compression since they do not have compressible patterns. Such objects do not produce efficient [`LZ compression`](https://en.wikipedia.org/wiki/LZ77_and_LZ78) which is a fitness factor for a lossless data compression. Below is a list of common files and content-types which are 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, even if compression is enabled for all types.
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- MinIO does not support encryption with compression because compression and encryption together potentially enables room for side channel attacks like [`CRIME and BREACH`](https://blog.minio.io/c-e-compression-encryption-cb6b7f04a369)
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- MinIO does not support compression for Gateway (Azure/GCS/NAS) implementations.
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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 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://docs.min.io/docs/minio-client-quickstart-guide)
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- [Use `aws-cli` with MinIO Server](https://docs.min.io/docs/aws-cli-with-minio)
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- [Use `s3cmd` with MinIO Server](https://docs.min.io/docs/s3cmd-with-minio)
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- [Use `minio-go` SDK with MinIO Server](https://docs.min.io/docs/golang-client-quickstart-guide)
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- [The MinIO documentation website](https://docs.min.io)
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