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add docs for caching drives with docker (#9712) 

fixes: #9688
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poornas 2020-05-27 09:49:09 -07:00 committed by GitHub
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docs/disk-caching/DESIGN.md
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@ -20,7 +20,7 @@ minio gateway <name> -h
...
...
7. Start MinIO gateway to s3 with edge caching enabled on '/mnt/drive1', '/mnt/drive2' and '/mnt/export1 ... /mnt/export24',
Start MinIO gateway to s3 with edge caching enabled on '/mnt/drive1', '/mnt/drive2' and '/mnt/export1 ... /mnt/export24',
exclude all objects under 'mybucket', exclude all objects with '.pdf' as extension. Cache only those objects accessed atleast 3 times. Garbage collection triggers in at high water mark (i.e. cache disk usage reaches 90% of cache quota) or at 72% and evicts oldest objects by access time until low watermark is reached ( 70% of cache quota) , i.e. 63% of disk usage.
$ export MINIO_CACHE_DRIVES="/mnt/drive1,/mnt/drive2,/mnt/export{1..24}"
$ export MINIO_CACHE_EXCLUDE="mybucket/*,*.pdf"
@ -32,6 +32,20 @@ minio gateway <name> -h
$ minio gateway s3
```
### Run MinIO gateway with cache on Docker Container
### Stable
Cache drives need to have `strictatime` or `relatime` enabled for disk caching feature. In this example, mount the xfs file system on /mnt/cache with `strictatime` or `relatime` enabled.
```
truncate -s 4G /tmp/data
mkfs.xfs /tmp/data # build xfs filesystem on /tmp/data
sudo mkdir /mnt/cache # create mount dir
sudo mount -o relatime /tmp/data /mnt/cache # mount xfs on /mnt/cache with atime.
docker pull minio/minio
docker run --net=host -e MINIO_ACCESS_KEY={s3-access-key} -e MINIO_SECRET_KEY={s3-secret-key} -e MINIO_CACHE_DRIVES=/cache -e MINIO_CACHE_QUOTA=99 -e MINIO_CACHE_AFTER=0 -e MINIO_CACHE_WATERMARK_LOW=90 -e MINIO_CACHE_WATERMARK_HIGH=95 -v /mnt/cache:/cache minio/minio:latest gateway s3
```
## Assumptions
- Disk cache quota defaults to 80% of your drive capacity.