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# Docker |
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## Prerequisites |
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The only prerequisites are: |
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1. This repo, and |
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2. Docker |
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Building the docker image pulls in all the dev dependencies to build loop within the image itself. Having a `go` development environment is not required. |
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## Building the Docker Image |
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The docker image can be built using this command within the `loop` directory: |
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``` |
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docker build --tag loop . |
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``` |
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This command pulls down a `go` build container, builds `loop` and `loopd` executables, then publishes those binaries to a fresh, smaller image, and marks that image with the tag 'loop'. |
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## Running the Docker Image |
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The docker image contains: |
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* The binary `loopd`, at `/go/bin/loopd` |
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* The binary `loop`, at `/go/bin/loop` |
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Docker is very flexible so you can use that information however you choose. This guide isn't meant to be prescriptive. |
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### Example: Running loopd |
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One way of running `loopd` is |
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``` |
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docker run --rm -it --name loopd -v $HOME/.lnd:/root/.lnd -v $HOME/.loop:/root/.loop loop:latest loopd --network=testnet --lnd.host <my-lnd-ip-address>:10009 |
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``` |
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Things to note from this docker command: |
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* You can stop the server with Control-C, and it'll clean up the associated stopped container automatically. |
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* The name of the running container is 'loopd' (which you may need to know to run the `loop` command). |
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* The '.lnd' directory in your home directory is mapped into the container, and `loopd` will look for your tls.cert and macaroon in the default locations. If this isn't appropriate for your case you can map whatever directories you choose and override where `loopd` looks for them using additional command-line parameters. |
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* The '.loop' directory in your home directory is mapped into the container, and `loopd` will use that directory to store some state. |
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* You probably need to specify your LND server host and port explicitly, since by default `loopd` looks for it on localhost and there is no LND server on localhost within the container. |
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* No ports are mapped, so it's not possible to connect to the running `loopd` from outside the container. (This is deliberate. You can map ports 8081 and 11010 to connect from outside the container if you choose.) |
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### Example: Running loop |
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If you're using the example above to run `loopd`, you can then run the `loop` command inside that running container to execute loops. One way would be: |
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``` |
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docker exec -it loopd loop out --channel <channel-id-you-want-to-use> --amt <amount-you-want-to-loop-out> |
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``` |
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Things to note about this docker command: |
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* `docker exec` runs a command on an already-running container. In this case `docker exec loopd` says effectively 'run the rest of this command-line as a command on the already-running container 'loopd'. |
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* The `-it` flags tell docker to run the command interatively and act like it's using a terminal. This helps with commands that do more than just write to stdout. |
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* The remainder `loop out --channel <channel-id-you-want-to-use> --amt <amount-you-want-to-loop-out>` is the actual loop command you want to run. All the regular `loop` documentation applies to this bit. |
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### A Handy Script |
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If you're using the example above to run `loopd`, creating a script can simplify running `loop`. |
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Create a file with the following contents: |
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``` |
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#!/usr/bin/env bash |
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TERMINAL_FLAGS= |
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if [ -t 1 ] ; then |
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TERMINAL_FLAGS="-it" |
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fi |
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docker exec $TERMINAL_FLAGS loopd loop "${@}" |
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``` |
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Call this script 'loop', put it somewhere in your $PATH, and make it executable. Then you can just run commands like: |
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``` |
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loop out --channel <channel-id-you-want-to-use> --amt <amount-you-want-to-loop-out> |
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``` |
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without having to remember (or use) the docker part explicitly. |
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## Caveats |
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Running `loopd` the way shown above won't restart `loopd` if it is stopped or if the computer is restarted. You may want to investigate running the 'loop' container at startup, or when your LND server starts. (For example, `docker` has restart options, or grouping of containers via `docker-compose`.) |