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https://github.com/teemow/loopback
Manage loopback devices to play with filesystems without lvm
https://github.com/teemow/loopback
Last synced: 25 days ago
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Manage loopback devices to play with filesystems without lvm
- Host: GitHub
- URL: https://github.com/teemow/loopback
- Owner: teemow
- License: apache-2.0
- Created: 2015-04-30T17:50:43.000Z (over 9 years ago)
- Default Branch: master
- Last Pushed: 2016-03-11T13:27:12.000Z (almost 9 years ago)
- Last Synced: 2024-06-19T19:41:59.466Z (6 months ago)
- Language: Go
- Homepage:
- Size: 35.2 KB
- Stars: 2
- Watchers: 2
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- License: LICENSE
Awesome Lists containing this project
README
# Loopback
[](http://godoc.org/github.com/teemow/loopback) [](http://hub.docker.com/teemow/loopback) [](https://kiwiirc.com/client/irc.freenode.net/#giantswarm)
In case you don't have a spare disk or partition but would like to play around with eg btrfs this tool creates a loopback device from a file which you can mount whereever you want.
Use cases:
* systemd machinectl
* conair (https://github.com/teemow/conair)
## Prerequisites
## Getting Loopback
Download the latest release from here: https://github.com/teemow/loopback/releases/latest
Clone the latest git repository version from here: https://github.com/teemow/loopback.git
### How to build
#### Build Dependencies
* `make`
* `docker`
#### Building the standard way
```
make && sudo make install
```
## Usage
You can create a mounted loopback device with 15G size like this:
```
loopback create --fs=ext4 --name=loopback-test size=15
```
Whenever you are done with working in the device you can unmount it like this:
```
loopback umount --name=loopback-test
```
When you don't need the device and image anymore you can destroy it like this:
```
loopback destroy --name=loopback-test
```
### Using with Docker containers
You can also use loopback in Docker containers:
```
docker run \
--rm \
-it \
--privileged \
-v /:/host:shared \
teemow/loopback \
create --fs=ext4 --image-path=/host/var/lib/loopback --name=loopback-test
```
If you are not yet using Docker 1.10 you can use `nsenter` which is shipped with
the image:
```
docker run \
--rm \
-it \
--privileged \
-v /:/host \
--entrypoint=/bin/bash \
teemow/loopback \
-c "/opt/loopback attach --fs=ext4 --image-path=/host/var/lib/loopback --name=loopback-test --create-missing-image && /opt/loopback list --no-headings | grep loopback-test.img | awk '{print \$1}' | xargs -I{} nsenter --mount=/host/proc/1/ns/mnt -- mount {} /mnt"
```
## Dependencies
* `dd`
* `losetup`
* `mkfs` (eg for btrfs)
* `mount`
Create a btrfs fs for machined
```
sudo loopback create --name=machined --size=10 --mount-path=/var/lib/machines
```
Remove the loopbacks
```
sudo loopback destroy --name=machined
```
## Further Steps
Check more detailed documentation: [docs](docs)
Check code documentation: [godoc](https://godoc.org/github.com/teemow/loopback)
## Contact
- Mailing list: [giantswarm](https://groups.google.com/forum/!forum/giantswarm)
- IRC: #[giantswarm](irc://irc.freenode.org:6667/#giantswarm) on freenode.org
- Bugs: [issues](https://github.com/teemow/loopback/issues)
## Contributing & Reporting Bugs
See [CONTRIBUTING](CONTRIBUTING.md) for details on submitting patches, the contribution workflow as well as reporting bugs.
## License
Loopback is under the Apache 2.0 license. See the [LICENSE](LICENSE) file for details.