# Docker Instructions There are two flavors of Dockerfiles available: - `Dockerfile`: Used for production builds. Checks out the source code from GitHub during build. The build argument `--build-arg checkout=v0.x.x-beta` can be used to specify what git tag or commit to check out before building. - `dev.Dockerfile` Used for development or testing builds. Uses the local code when building and allows local changes to be tested more easily. ## Development/testing To build a standalone development image from the local source directory, use the following command: ```shell ⛰ docker build --tag=myrepository/lnd-dev -f dev.Dockerfile . ``` There is also a `docker-compose` setup available for development or testing that spins up a `btcd` backend alongside `lnd`. Check out the documentation at [docker/README.md](../docker/README.md) to learn more about how to use that setup to create a small local Lightning Network. ## Production (manual build) To use Docker in a production environment, you can run `lnd` by creating a Docker container, adding the appropriate command-line options as parameters. You first need to build the `lnd` docker image: ```shell ⛰ docker build --tag=myrepository/lnd --build-arg checkout=v0.11.1-beta . ``` It is recommended that you checkout the latest released tag. You can continue by creating and running the container: ```shell ⛰ docker run myrepository/lnd [command-line options] ``` ## Production (official images) Starting with `lnd v0.12.0-beta`, there are official, automatically built docker images of `lnd` available in the [`lightninglabs/lnd` repository on Docker Hub](https://hub.docker.com/r/lightninglabs/lnd). You can just pull those images by specifying a release tag: ```shell ⛰ docker pull lightninglabs/lnd:v0.12.0-beta ⛰ docker run lightninglabs/lnd [command-line options] ``` ### Verifying docker images To verify the `lnd` and `lncli` binaries inside the docker images against the signed, [reproducible release binaries](release.md), there is a verification script in the image that can be called (before starting the container for example): ```shell ⛰ docker pull lightninglabs/lnd:v0.12.0-beta ⛰ docker run --rm --entrypoint="" lightninglabs/lnd:v0.12.0-beta /verify-install.sh ⛰ OK=$? ⛰ if [ "$OK" -ne "0" ]; then echo "Verification failed!"; exit 1; done ⛰ docker run lightninglabs/lnd [command-line options] ``` ## Volumes A Docker volume will be created with your `.lnd` directory automatically, and will persist through container restarts. You can also optionally manually specify a local folder to be used as a volume: ```shell ⛰ docker create --name=mylndcontainer -v /media/lnd-docker/:/root/.lnd myrepository/lnd [command-line options] ``` ## Example Here is an example testnet `lnd` that uses Neutrino: ```shell ⛰ docker run --name lnd-testnet myrepository/lnd --bitcoin.active --bitcoin.testnet --bitcoin.node=neutrino --neutrino.connect=faucet.lightning.community ``` Create a wallet (and write down the seed): ```shell ⛰ docker exec -it lnd-testnet lncli create ``` Confirm `lnd` has begun to synchronize: ```shell ⛰ docker logs lnd-testnet [snipped] 2018-05-01 02:28:01.201 [INF] RPCS: RPC server listening on 127.0.0.1:10009 2018-05-01 02:28:01.201 [INF] LTND: Waiting for chain backend to finish sync, start_height=2546 2018-05-01 02:28:01.201 [INF] RPCS: gRPC proxy started at 127.0.0.1:8080 2018-05-01 02:28:08.999 [INF] LNWL: Caught up to height 10000 2018-05-01 02:28:09.872 [INF] BTCN: Processed 10547 blocks in the last 10.23s (height 10547, 2012-05-28 05:02:32 +0000 UTC) ``` This is a simple example, it is possible to use any command-line options necessary to expose RPC ports, use `btcd` or `bitcoind`, or add additional chains. ## LND Development and Testing To test the Docker production image locally, run the following from the project root: ```shell ⛰ docker build . -t myrepository/lnd:master ``` To choose a specific branch or tag instead, use the "checkout" build-arg. For example, to build the latest commits in master: ```shell ⛰ docker build . --build-arg checkout=v0.8.0-beta -t myrepository/lnd:v0.8.0-beta ``` To build the image using the most current tag: ```shell ⛰ docker build . --build-arg checkout=$(git describe --tags `git rev-list --tags --max-count=1`) -t myrepository/lnd:latest-tag ``` Once the image has been built and tagged locally, start the container: ```shell ⛰ docker run --name=lnd-testnet -it myrepository/lnd:latest-tag --bitcoin.active --bitcoin.testnet --bitcoin.node=neutrino --neutrino.connect=faucet.lightning.community ```