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Eclair (French for Lightning) is a Scala implementation of the Lightning Network.
:construction: Both the BOLTs and Eclair itself are still a work in progress. Expect things to break/change!
:rotating_light: If you run Eclair on mainnet (which is the default setting):
- Keep in mind that it is beta-quality software and don't put too much money in it
- Eclair's JSON API should NOT be accessible from the outside world (similarly to Bitcoin Core API)
Lightning Network Specification Compliance
Please see the latest release note for detailed information on BOLT compliance.
Eclair offers a feature rich HTTP API that enables application developers to easily integrate.
For more information please visit the API documentation website.
Please visit our [docs](./docs) and wiki to find detailed instructions on how to configure your node, connect to other nodes, open channels, send and receive payments and more advanced scenario.
You will find detailed guides and frequently asked questions there.
Configuring Bitcoin Core
:warning: Eclair requires Bitcoin Core 0.18.1, 0.19.1 or 0.20.1. If you are upgrading an existing wallet, you may need to create a new address and send all your funds to that address.
Eclair needs a synchronized, segwit-ready, zeromq-enabled, wallet-enabled, non-pruning, tx-indexing Bitcoin Core node.
You can configure your Bitcoin node to use either
p2sh-segwit addresses or
bech32 addresses, Eclair is compatible with both modes.
If your wallet has "non-segwit UTXOs" (outputs that are neither
bech32), you must send them to a
bech32 address before running eclair.
Run bitcoind with the following minimal
server=1 rpcuser=foo rpcpassword=bar txindex=1 zmqpubrawblock=tcp://127.0.0.1:29000 zmqpubrawtx=tcp://127.0.0.1:29000
Eclair is developed in Scala, a powerful functional language that runs on the JVM, and is packaged as a ZIP archive.
To run Eclair, you first need to install Java, we recommend that you use OpenJDK 11. Other runtimes also work but we don't recommend using them.
Then download our latest release, unzip the archive and run the following command:
Eclair reads its configuration file, and write its logs, to
~/.eclair by default.
To change your node's configuration, create a file named
~/.eclair. Here's an example configuration file:
Here are some of the most common options:
|eclair.chain||Which blockchain to use: regtest, testnet or mainnet||mainnet|
|eclair.server.port||Lightning TCP port||9735|
|eclair.api.enabled||Enable/disable the API||false. By default the API is disabled. If you want to enable it, you must set a password.|
|eclair.api.port||API HTTP port||8080|
|eclair.api.password||API password (BASIC)||"" (must be set if the API is enabled)|
|eclair.bitcoind.rpcuser||Bitcoin Core RPC user||foo|
|eclair.bitcoind.rpcpassword||Bitcoin Core RPC password||bar|
|eclair.bitcoind.zmqblock||Bitcoin Core ZMQ block address||"tcp://127.0.0.1:29000"|
|eclair.bitcoind.zmqtx||Bitcoin Core ZMQ tx address||"tcp://127.0.0.1:29000"|
|eclair.bitcoind.wallet||Bitcoin Core wallet name||""|
Quotes are not required unless the value contains special characters. Full syntax guide here.
→ see [
reference.conf](eclair-core/src/main/resources/reference.conf) for full reference. There are many more options!
Configure Bitcoin Core wallet
Eclair will use the default loaded Bitcoin Core wallet to fund any channels you choose to open.
If you want to use a different wallet from the default one, you must set
eclair.bitcoind.wallet accordingly in your
:warning: Once a wallet is configured, you must be very careful if you want to change it: changing the wallet when you have channels open may result in a loss of funds (or a complex recovery procedure).
Eclair will return BTC from closed channels to the wallet configured. Any BTC found in the wallet can be used to fund the channels you choose to open.
Java Environment Variables
Some advanced parameters can be changed with java environment variables. Most users won't need this and can skip this section.
:warning: Using separate
datadir is mandatory if you want to run several instances of eclair on the same machine. You will also have to change ports in
eclair.conf (see above).
|eclair.datadir||Path to the data directory||~/.eclair|
|eclair.printToConsole||Log to stdout (in addition to eclair.log)|
For example, to specify a different data directory you would run the following command:
logback for logging. To use a different configuration, and override the internal logback.xml, run:
The files that you need to backup are located in your data directory. You must backup:
- your seed (
- your channel database (
regtestdepending on which chain you're running on)
Your seed never changes once it has been created, but your channels will change whenever you receive or send payments. Eclair will
create and maintain a snapshot of its database, named
eclair.sqlite.bak, in your data directory, and update it when needed. This file is
always consistent and safe to use even when Eclair is running, and this is what you should backup regularly.
For example you could configure a
cron task for your backup job. Or you could configure an optional notification script to be called by eclair once a new database snapshot has been created, using the following option:
eclair.backup-notify-script = "/absolute/path/to/script.sh"
Make sure that your script is executable and uses an absolute path name for
Note that depending on your filesystem, in your backup process we recommend first moving
eclair.sqlite.bak to some temporary file
before copying that file to your final backup location.
A [Dockerfile](Dockerfile) image is built on each commit on docker hub for running a dockerized eclair-node.
You can use the
JAVA_OPTS environment variable to set arguments to
docker run -ti --rm -e "JAVA_OPTS=-Xmx512m -Declair.api.binding-ip=0.0.0.0 -Declair.node-alias=node-pm -Declair.printToConsole" acinq/eclair
If you want to persist the data directory, you can make the volume to your host with the
-v argument, as the following example:
docker run -ti --rm -v "/path_on_host:/data" -e "JAVA_OPTS=-Declair.printToConsole" acinq/eclair
If you enabled the API you can check the status of eclair using the command line tool:
docker exec <container_name> eclair-cli -p foobar getinfo
For advanced usage, Eclair supports plugins written in Scala, Java, or any JVM-compatible language.
A valid plugin is a jar that contains an implementation of the [Plugin](eclair-node/src/main/scala/fr/acinq/eclair/Plugin.scala) interface, and
a manifest entry for
Main-Class with the FQDN of the implementation.
Here is how to run Eclair with plugins:
eclair-node-<version>-<commit_id>/bin/eclair-node.sh <plugin1.jar> <plugin2.jar> <...>
Eclair is configured to run on mainnet by default, but you can still run it on testnet (or regtest): start your Bitcoin Node in
testnet mode (add
bitcoin.conf or start with
-testnet), and change Eclair's chain parameter and Bitcoin RPC port:
You may also want to take advantage of the new configuration sections in
bitcoin.conf to manage parameters that are network specific,
so you can easily run your bitcoin node on both mainnet and testnet. For example you could use:
server=1 txindex=1 [main] rpcuser=<your-mainnet-rpc-user-here> rpcpassword=<your-mainnet-rpc-password-here> zmqpubrawblock=tcp://127.0.0.1:29000 zmqpubrawtx=tcp://127.0.0.1:29000 [test] rpcuser=<your-testnet-rpc-user-here> rpcpassword=<your-testnet-rpc-password-here> zmqpubrawblock=tcp://127.0.0.1:29001 zmqpubrawtx=tcp://127.0.0.1:29001
-  The Bitcoin Lightning Network: Scalable Off-Chain Instant Payments by Joseph Poon and Thaddeus Dryja
-  Reaching The Ground With Lightning by Rusty Russell
-  Lightning Network Explorer - Explore testnet LN nodes you can connect to
*Note that all licence references and agreements mentioned in the Eclair README section above are relevant to that project's source code only.