# Docker Images
> The Dockerfiles used to build the images that the Polar app needs to spin up nodes quickly across multiple operating systems.
_Warning: These images are not hardened and shouldn't be used to store real bitcoin. These images are intended solely to be used in simnet/regtest environments_
## Bitcoin Core
### Tags
- `0.18.1` , `latest` ([bitcoind/Dockerfile](https://github.com/jamaljsr/polar/blob/master/docker/bitcoind/Dockerfile))
**Building the image**
```sh
$ cd bitcoind
$ docker build --build-arg BITCOIN_VERSION=< version > -t polarlightning/bitcoind:latest -t polarlightning/bitcoind:< version > .
```
Replace `<version>` with the desired bitcoind version (ex: `0.18.1` )
**Push to Docker Hub**
```sh
$ docker push polarlightning/bitcoind:< version >
$ docker push polarlightning/bitcoind:latest
```
## LND
### Tags
- `0.8.0-beta` , `latest` ([lnd/Dockerfile](https://github.com/jamaljsr/polar/blob/master/docker/lnd/Dockerfile))
- `0.7.1-beta` ([lnd/Dockerfile](https://github.com/jamaljsr/polar/blob/master/docker/lnd/Dockerfile))
**Building the image**
```sh
$ cd lnd
$ docker build --build-arg LND_VERSION=< version > -t polarlightning/lnd:latest -t polarlightning/lnd:< version > .
```
Replace `<version>` with the desired LND version (ex: `0.8.0-beta` )
**Push to Docker Hub**
```sh
$ docker push polarlightning/lnd:< version >
$ docker push polarlightning/lnd:latest
```
