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Vincent Fiduccia
2018-05-01 16:34:58 -07:00
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content/os/v1.x/en/installation/boot-process/image-preloading/_index.md
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---
title: Image Preloading
weight: 152
---
## Image Preloading
---
On boot, RancherOS scans `/var/lib/rancher/preload/docker` and `/var/lib/rancher/preload/system-docker` directories and tries to load container image archives it finds there, with `docker load` and `system-docker load`.
The archives are `.tar` files, optionally compressed with `xz` or `gzip`. These can be produced by `docker save` command, e.g.:
```
$ docker save my-image1 my-image2 some-other/image3 | xz > my-images.tar.xz
```
The resulting files should be placed into `/var/lib/rancher/preload/docker` or `/var/lib/rancher/preload/system-docker` (depending on whether you want it preloaded into Docker or System Docker).
Pre-loading process only reads each new archive once, so it won't take time on subsequent boots (`<archive>.done` files are created to mark the read archives). If you update the archive (place a newer archive with the same name) it'll get read on the next boot as well.
Pre-packing docker images is handy when you're customizing your RancherOS distribution (perhaps, building cloud VM images for your infrastructure).