nix-bitcoin/docs/configuration.md

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# Managing your deployment
This section applies to users of the deployment method described in the [installation guide](./install.md).
## Deployment shell
Run command `nix-shell` in your deployment directory.\
You now have access to deployment commands:
- `deploy`\
Deploy the current configuration to your node.
- `eval-config`\
Locally evaluate the configuration. This is useful to check for configuration errors.
- `h`, `help`\
Show help
## Updating nix-bitcoin
Run `update-nix-bitcoin` from the deployment shell.\
This fetches the latest release, verifies its signatures and updates `nix-bitcoin-release.nix`.
# Customizing your configuration
## Get started with Nix
See [Nix - A One Pager](https://github.com/tazjin/nix-1p) for a short guide
to Nix, the language used in `configuration.nix`.
You can follow along this guide by running command `nix repl` which allows you to interactively
evaluate Nix expressions.
For a general introduction to the Nix and NixOS ecosystem, see [nix.dev](https://nix.dev/).
## Set options
All features and services are configurable through options. You can find a list of
supported options at the top of each nix-bitcoin [module](../modules/modules.nix)
(Examples: [bitcoind.nix](../modules/bitcoind.nix), [btcpayserver.nix](../modules/btcpayserver.nix)).
Example: Set some `bitcoind` options by adding these lines to your `configuration.nix`:
```nix
# Use a custom data dir
services.bitcoind.dataDir = "/my/datadir";
# Enable txindex
services.bitcoind.txindex = true;
```
You can also use regular [NixOS options](https://search.nixos.org/options)
for configuring your system:
```nix
networking.hostName = "myhost";
time.timeZone = "UTC";
```
## Debug your configuration
To print the values of specific options of your config, add the following to your `configuration.nix`:
```nix
system.extraDependencies = let
debugVal = config.networking.firewall.allowedTCPPorts;
# More example options:
# debugVal = config.environment.systemPackages;
# debugVal = config.services.bitcoind.dataDir;
in lib.traceSeqN 3 debugVal [];
```
and run command `eval-config` from the deployment shell.
# Allowing external connections to services
## Allow peer connections to bitcoind
```nix
services.bitcoind = {
# Accept incoming peer connections
listen = true;
# Listen to connections on all interfaces
address = "0.0.0.0";
# Set this to also add IPv6 connectivity.
extraConfig = ''
bind=::
'';
# If you're using the `secure-node.nix` template, set this to allow non-Tor connections
# to bitcoind
tor.enforce = false;
# Also set this if bitcoind should not use Tor for outgoing peer connections
tor.proxy = false;
};
# Open the p2p port in the firewall
networking.firewall.allowedTCPPorts = [ config.services.bitcoind.port ];
```
## Allow bitcoind RPC connections from LAN
```nix
services.bitcoind = {
# Listen to RPC connections on all interfaces
rpc.address = "0.0.0.0";
# Allow RPC connections from external addresses
rpc.allowip = [
"10.10.0.0/24" # Allow a subnet
"10.50.0.3" # Allow a specific address
"0.0.0.0/0" # Allow all addresses
];
# Set this if you're using the `secure-node.nix` template
tor.enforce = false;
};
# Open the RPC port in the firewall
networking.firewall.allowedTCPPorts = [ config.services.bitcoind.rpc.port ];
```
## Allow connections to electrs
```nix
services.electrs = {
# Listen to connections on all interfaces
address = "0.0.0.0";
# Set this if you're using the `secure-node.nix` template
tor.enforce = false;
};
# Open the electrs port in the firewall
networking.firewall.allowedTCPPorts = [ config.services.electrs.port ];
```
You can use the same approach to allow connections to other services.
# Migrate existing services to nix-bitcoin
## Example: bitcoind
```shell
# 1. Stop bitcoind on your nodes
ssh root@nix-bitcoin-node 'systemctl stop bitcoind'
# Also stop bitcoind on the node that you'll be copying data from
# 2. Copy the data to the nix-bitcoin node
# Important: Add a trailing slash to the source path
rsync /path/to/existing/bitcoind-datadir/ root@nix-bitcoin-node:/var/lib/bitcoind
# 3. Fix data dir permissions on the nix-bitcoin node
ssh root@nix-bitcoin-node 'chown -R bitcoin: /var/lib/bitcoind'
# 4. Start bitcoind
ssh root@nix-bitcoin-node 'systemctl start bitcoind'
```
You can use the same workflow for other services.\
The default data dir path is `/var/lib/<service>` for all services.
Some services require extra steps:
- lnd
Copy your wallet password to `$secretsDir/lnd-wallet-password` (See: [Secrets dir](#secrets-dir)).
- btcpayserver
Copy the postgresql database:
```shell
# Export (on the other node)
sudo -u postgres pg_dump YOUR_BTCPAYSERVER_DB > export.sql
# Restore (on the nix-bitcoin node)
sudo -u postgres psql btcpaydb < export.sql
```
- joinmarket
Copy your wallet to `/var/lib/joinmarket/wallets/wallet.jmdat`.\
Write your wallet password, without a trailing newline, to
`$secretsDir/jm-wallet-password` (See: [Secrets dir](#secrets-dir)).
# Use bitcoind from another node
Use a bitcoind instance running on another node within a nix-bitcoin config.
```nix
imports = [ <nix-bitcoin/modules/presets/bitcoind-remote.nix> ];
services.bitcoind = {
enable = true;
# Address of the other node
address = "10.10.0.2";
rpc.address = "10.10.0.2";
# Some nix-bitcoin services require whitelisted bitcoind p2p connections
# to work reliably.
# Search for `whitelistedPort` in this repo to see the affected services.
# If you're using one of these services, either add a whitelisted p2p port
# on your remote node via `whitebind` and set it here:
whitelistedPort = <remote whitebind RPC port>;
#
# Or use the default p2p port and add `whitelist=<address of this node>` to
# your remote bitcoind config:
whitelistedPort = config.services.bitcoind.port;
rpc.users = let
# The fully privileged bitcoind RPC username of the other node
name = "myrpcuser";
in {
privileged.name = name;
public.name = name;
## Set this if you use btcpayserver
# btcpayserver.name = name;
## Set this if you use joinmarket-ob-watcher
# joinmarket-ob-watcher.name = name;
};
};
```
Now save the password of the RPC user to the following files on your nix-bitcoin node:
```shell
$secretsDir/bitcoin-rpcpassword-privileged
$secretsDir/bitcoin-rpcpassword-public
## Only needed when set in the above config snippet
# $secretsDir/bitcoin-rpcpassword-btcpayserver
# $secretsDir/bitcoin-rpcpassword-joinmarket-ob-watcher
```
See: [Secrets dir](#secrets-dir)
Restart `bitcoind` after updating the secrets: `systemctl restart bitcoind`.
# Temporarily disable a service
Sometimes you might want to disable a service without removing the service user and
integration with other services, as it would happen when setting
`services.<service>.enable = false`.
Use the following approach:
```
systemd.services.<service>.wantedBy = mkForce [];
```
This way, the systemd service still exists, but is not automatically started.\
Note: This only works for services that are not required by other active services.
# Appendix
## Secrets dir
The secrets dir is set by option `nix-bitoin.secretsDir` and has the
following default values:
- If you're using the krops deployment method: `/var/src/secrets`
- Otherwise:
- `/secrets` (if you're using the `secure-node.nix` template)
- `/etc/nix-bitcoin-secrets` (otherwise)
`/secrets` only exists to provide backwards compatibility for users of the
`secure-node.nix` template.