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88 lines
2.9 KiB
Markdown
88 lines
2.9 KiB
Markdown
# Experimental etcd support in LND
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With the recent introduction of the `kvdb` interface LND can support multiple
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database backends allowing experimentation with the storage model as well as
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improving robustness trough eg. replicating essential data.
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Building on `kvdb` in v0.11.0 we're adding experimental [etcd](https://etcd.io)
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support to LND. As this is an unstable feature heavily in development, it still
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has *many* rough edges for the time being. It is therefore highly recommended to
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not use LND on `etcd` in any kind of production environment especially not
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on bitcoin mainnet.
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## Building LND with etcd support
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To create a dev build of LND with etcd support use the following command:
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```shell
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⛰ make tags="kvdb_etcd"
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```
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The important tag is the `kvdb_etcd`, without which the binary is built without
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the etcd driver.
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For development it is advised to set the `GOFLAGS` environment variable to
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`"-tags=test"` otherwise `gopls` won't work on code in `channeldb/kvdb/etcd`
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directory.
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## Running a local etcd instance for testing
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To start your local etcd instance for testing run:
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```shell
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⛰ ./etcd \
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--auto-tls \
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--advertise-client-urls=https://127.0.0.1:2379 \
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--listen-client-urls=https://0.0.0.0:2379 \
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--max-txn-ops=16384 \
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--max-request-bytes=104857600
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```
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The large `max-txn-ops` and `max-request-bytes` values are currently required in
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case of running LND with the full graph in etcd. Upcoming versions will split
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the database to local and replicated parts and only essential parts will remain
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in the replicated database, removing the requirement for these additional
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settings. These parameters have been tested to work with testnet LND.
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## Configuring LND to run on etcd
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To run LND with etcd, additional configuration is needed, specified either
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through command line flags or in `lnd.conf`.
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Sample command line:
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```shell
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⛰ ./lnd-debug \
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--db.backend=etcd \
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--db.etcd.host=127.0.0.1:2379 \
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--db.etcd.certfile=/home/user/etcd/bin/default.etcd/fixtures/client/cert.pem \
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--db.etcd.keyfile=/home/user/etcd/bin/default.etcd/fixtures/client/key.pem \
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--db.etcd.insecure_skip_verify
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```
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Sample `lnd.conf` (with other setting omitted):
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```text
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[db]
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db.backend=etcd
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db.etcd.host=127.0.0.1:2379
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db.etcd.cerfile=/home/user/etcd/bin/default.etcd/fixtures/client/cert.pem
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db.etcd.keyfile=/home/user/etcd/bin/default.etcd/fixtures/client/key.pem
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db.etcd.insecure_skip_verify=true
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```
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Optionally users can specifiy `db.etcd.user` and `db.etcd.pass` for db user
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authentication. If the database is shared, it is possible to separate our data
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from other users by setting `db.etcd.namespace` to an (already existing) etcd
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namespace. In order to test without TLS, users are able to set `db.etcd.disabletls`
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flag to `true`.
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## Migrating existing channel.db to etcd
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This is currently not supported.
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## Disclaimer
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As mentioned before this is an experimental feature, and with that your data
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may be lost. Use at your own risk!
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