From a5f9d13ca4aa765c0d8ff8e3129500a9b6649173 Mon Sep 17 00:00:00 2001
From: bitdeals <nobody@bitdeals.org>
Date: Thu, 6 Aug 2026 11:56:56 +0000
Subject: [PATCH] feat: docker image for ElectrumX, configured by environment
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Replaces lukechilds/electrumx, unmaintained for years. ElectrumX 2.0.0 from the
upstream tag, rocksdb, built in a venv so only the runtime library follows into
the final image.

Every variable is ElectrumX's own — the entrypoint only fills defaults and
rejects the one mistake that is expensive to diagnose: NET spelled the way
bitcoind spells it ("test" for "testnet"), which otherwise fails deep inside a
coin-class lookup. DB_ENGINE defaults to rocksdb because 2.0 made the variable
required, and peer discovery is off because this image is for private indexers.

Verified on testnet2 against the sibling bitcoind image: coin BitcoinRegtest,
db height matching daemon height at 101, Electrum protocol answering on 50001.
That run also found what the README now states — 2.x refuses to serve unless
the daemon runs with both txindex=1 and txospenderindex=1.
---
 README.md               | 131 +++++++++++++++++++++++++++++++++++++++
 README.ru-RU.md         | 132 ++++++++++++++++++++++++++++++++++++++++
 docker-compose.yml      |  26 ++++++++
 docker/Dockerfile       |  74 ++++++++++++++++++++++
 docker/healthy_check.sh |  12 ++++
 docker/run.sh           |  75 +++++++++++++++++++++++
 6 files changed, 450 insertions(+)
 create mode 100644 README.md
 create mode 100644 README.ru-RU.md
 create mode 100644 docker-compose.yml
 create mode 100644 docker/Dockerfile
 create mode 100755 docker/healthy_check.sh
 create mode 100755 docker/run.sh

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..305e158
--- /dev/null
+++ b/README.md
@@ -0,0 +1,131 @@
+# Intro
+
+> Русская версия: [README.ru-RU.md](README.ru-RU.md)
+
+[ElectrumX](https://github.com/spesmilo/electrumx) is a server for the Electrum protocol. It indexes the chain from a full node and answers the queries a light client cannot answer for itself: the history and the UTXOs of an arbitrary address, and transaction broadcast.
+
+ElectrumX running in a docker container, configured by environment variables.
+
+This repository covers the docker deployment only. ElectrumX itself is installed from a pinned upstream git tag.
+
+# Usage
+
+ElectrumX needs a `bitcoind` it can reach over RPC, on the same network, not
+pruned. `DAEMON_URL` is the only required variable; `NET` must name the same
+chain the daemon runs.
+
+The container serves the Electrum protocol on **50001** (plaintext TCP) and, if
+`SERVICES` asks for it, on **50002** (TLS). There is no authentication of any
+kind, so keep both inside the docker network or on loopback. The **RPC** service
+on `localhost:8000` is administrative and never leaves the container — the
+health check is what uses it.
+
+## docker-compose
+
+```yaml
+services:
+  electrumx:
+    build:
+      context: https://git.bitdeals.org/private/electrumx.git
+      dockerfile: ./docker/Dockerfile
+    image: registry.bitdeals.org/electrumx
+    environment:
+      - COIN=Bitcoin
+      - NET=regtest
+      - DAEMON_URL=http://CHANGE_ME:CHANGE_ME@bitcoind:18443
+      - CACHE_MB=400
+    ports:
+      - 127.0.0.1:50001:50001   # no auth — loopback only
+    volumes:
+      - electrumxdata:/data
+
+volumes:
+  electrumxdata:
+```
+
+## docker cli
+
+```sh
+docker run -d \
+  -e COIN=Bitcoin \
+  -e NET=regtest \
+  -e DAEMON_URL=http://CHANGE_ME:CHANGE_ME@bitcoind:18443 \
+  -e CACHE_MB=400 \
+  -p 127.0.0.1:50001:50001 \
+  -v electrumxdata:/data \
+  registry.bitdeals.org/electrumx
+```
+
+Anything after the image name is passed on to `electrumx_server`.
+
+## build and publish
+
+```sh
+docker build . --file docker/Dockerfile --tag registry.bitdeals.org/electrumx
+docker push registry.bitdeals.org/electrumx
+```
+
+A different ElectrumX release is a build argument — use a tag from
+[the upstream repository](https://github.com/spesmilo/electrumx/tags):
+
+```sh
+docker build . --file docker/Dockerfile \
+  --build-arg ELECTRUMX_VERSION=2.0.0 \
+  --tag registry.bitdeals.org/electrumx:2.0.0
+```
+
+# Parameters
+
+Container images are configured using parameters passed at runtime. Every
+variable is ElectrumX's own, so
+[the upstream environment reference](https://electrumx-spesmilo.readthedocs.io/en/latest/environment.html)
+applies unchanged; the table lists the ones this image gives a default to.
+
+|Parameter|Function|
+|:--------|:-------|
+|-p 127.0.0.1:50001|Electrum protocol over plaintext TCP. No authentication — see "Notes"|
+|-p 127.0.0.1:50002|Electrum protocol over TLS. Served only when `SERVICES` includes `ssl://`|
+|-v /data|Data directory: the index, and the self-signed certificate if one was generated. Losing it means indexing the chain again|
+|-e DAEMON_URL|**Required.** The daemon's RPC, e.g. `http://user:password@bitcoind:8332`. Several may be given, comma-separated|
+|-e COIN|Coin class. Default: `Bitcoin`|
+|-e NET|Network: `mainnet`, `testnet`, `testnet4`, `signet`, `regtest` or `mutinynet`. Must match the daemon's chain. Default: `mainnet`|
+|-e DB_ENGINE|Index storage. Default: `rocksdb`, the only engine whose libraries this image carries|
+|-e DB_DIRECTORY|Where the index lives. Default: `/data`|
+|-e SERVICES|What to serve, comma-separated. Default: `tcp://:50001,rpc://localhost:8000`. Keep an `rpc://` entry — the health check needs it|
+|-e SSL_CERTFILE, -e SSL_KEYFILE|TLS certificate and key. Default: generated as a self-signed pair in the data directory when `SERVICES` includes `ssl://`|
+|-e PEER_DISCOVERY|Whether to learn other public servers. Default: `off` — this image is meant for a private indexer|
+|-e PEER_ANNOUNCE|Whether to announce this server to the peer network. Default: `false`|
+|-e CACHE_MB|Indexing cache. Default: `1200` (ElectrumX's own). Lower it for a small chain, raise it to speed up an initial mainnet index|
+
+# Notes
+
+- **There is no authentication.** Anyone who reaches 50001 or 50002 can query
+  any address and broadcast transactions. Publish to loopback, or not at all
+  when the clients are containers on the same network.
+- **An index from another image is not readable.** This one runs rocksdb;
+  `lukechilds/electrumx`, which it replaces in BitDeals, wrote leveldb. Point
+  the container at an empty volume and let it index — for regtest and testnet
+  this is quick, for mainnet it is a matter of days.
+- **The daemon needs `txindex=1` and `txospenderindex=1`.** ElectrumX 2.x checks
+  `getindexinfo` before it serves anything and exits with a `RuntimeError`
+  naming the missing index — one at a time, so fixing `txindex` earns you the
+  same message about `txospenderindex`. With the sibling
+  [bitcoind image](https://git.bitdeals.org/private/bitcoind) that is
+  `BITCOIND_TXINDEX=1` and `BITCOIND_TXOSPENDERINDEX=1`; on an existing datadir
+  turning them on means a reindex of the daemon.
+- **The daemon must not be pruned.** Indexing reads every block; a pruned node
+  fails partway through with an error about a missing block rather than about
+  the configuration.
+- **`NET` is ElectrumX's spelling, not bitcoind's.** The daemon calls the
+  networks `main`, `test` and `regtest`; ElectrumX calls them `mainnet`,
+  `testnet` and `regtest`. The entrypoint rejects an unknown value, because the
+  pair is usually configured from one `.env` and `NET=test` would otherwise
+  fail deep inside a coin lookup.
+- **The container turns healthy only once it is serving**, which is after it has
+  caught up with the daemon. An initial mainnet index takes days and the
+  container will be unhealthy for all of it — watch the logs instead; on regtest
+  it is a matter of seconds.
+- **A self-signed certificate is generated only if `SERVICES` asks for TLS and
+  no files are supplied.** Clients then have to trust it explicitly. That is the
+  price of ElectrumX refusing to start when `ssl://` is requested without a
+  certificate, which is a surprising way to learn you added a port.
diff --git a/README.ru-RU.md b/README.ru-RU.md
new file mode 100644
index 0000000..ba35ba2
--- /dev/null
+++ b/README.ru-RU.md
@@ -0,0 +1,132 @@
+# Общие сведения
+
+> English version: [README.md](README.md)
+
+[ElectrumX](https://github.com/spesmilo/electrumx) — сервер протокола Electrum. Он индексирует цепочку по данным полного узла и отвечает на запросы, которые лёгкий клиент не может обработать сам: история и UTXO произвольного адреса, а также публикация транзакций.
+
+ElectrumX, работающий в docker-контейнере, настраивается переменными окружения.
+
+Репозиторий описывает только развёртывание в docker. Сам ElectrumX устанавливается из зафиксированного тега upstream-репозитория.
+
+# Использование
+
+ElectrumX нужен `bitcoind`, доступный по RPC, в той же сети и без обрезки
+цепочки. `DAEMON_URL` — единственная обязательная переменная; `NET` должен
+называть ту же сеть, в которой работает демон.
+
+Контейнер отдаёт протокол Electrum на порту **50001** (открытый TCP) и, если
+этого требует `SERVICES`, на порту **50002** (TLS). Никакой аутентификации нет,
+поэтому держите оба порта во внутренней сети docker или на loopback.
+Служебный **RPC** на `localhost:8000` наружу не выходит — им пользуется проверка
+состояния контейнера.
+
+## docker-compose
+
+```yaml
+services:
+  electrumx:
+    build:
+      context: https://git.bitdeals.org/private/electrumx.git
+      dockerfile: ./docker/Dockerfile
+    image: registry.bitdeals.org/electrumx
+    environment:
+      - COIN=Bitcoin
+      - NET=regtest
+      - DAEMON_URL=http://CHANGE_ME:CHANGE_ME@bitcoind:18443
+      - CACHE_MB=400
+    ports:
+      - 127.0.0.1:50001:50001   # без аутентификации — только loopback
+    volumes:
+      - electrumxdata:/data
+
+volumes:
+  electrumxdata:
+```
+
+## docker cli
+
+```sh
+docker run -d \
+  -e COIN=Bitcoin \
+  -e NET=regtest \
+  -e DAEMON_URL=http://CHANGE_ME:CHANGE_ME@bitcoind:18443 \
+  -e CACHE_MB=400 \
+  -p 127.0.0.1:50001:50001 \
+  -v electrumxdata:/data \
+  registry.bitdeals.org/electrumx
+```
+
+Всё, что указано после имени образа, передаётся `electrumx_server`.
+
+## сборка и публикация
+
+```sh
+docker build . --file docker/Dockerfile --tag registry.bitdeals.org/electrumx
+docker push registry.bitdeals.org/electrumx
+```
+
+Другая версия ElectrumX задаётся аргументом сборки — берите тег из
+[upstream-репозитория](https://github.com/spesmilo/electrumx/tags):
+
+```sh
+docker build . --file docker/Dockerfile \
+  --build-arg ELECTRUMX_VERSION=2.0.0 \
+  --tag registry.bitdeals.org/electrumx:2.0.0
+```
+
+# Параметры
+
+Образы контейнера настраиваются параметрами, передаваемыми при запуске. Все
+переменные — собственные переменные ElectrumX, поэтому
+[справочник upstream](https://electrumx-spesmilo.readthedocs.io/en/latest/environment.html)
+применим без изменений; в таблице перечислены те, которым этот образ задаёт
+значения по умолчанию.
+
+|Параметр|Назначение|
+|:--------|:-------|
+|-p 127.0.0.1:50001|Протокол Electrum поверх открытого TCP. Аутентификации нет — см. «Замечания»|
+|-p 127.0.0.1:50002|Протокол Electrum поверх TLS. Отдаётся, только если `SERVICES` содержит `ssl://`|
+|-v /data|Каталог данных: индекс и самоподписанный сертификат, если он был создан. Его потеря означает повторную индексацию цепочки|
+|-e DAEMON_URL|**Обязательный.** RPC демона, например `http://user:password@bitcoind:8332`. Можно указать несколько через запятую|
+|-e COIN|Класс монеты. По умолчанию: `Bitcoin`|
+|-e NET|Сеть: `mainnet`, `testnet`, `testnet4`, `signet`, `regtest` или `mutinynet`. Должна совпадать с сетью демона. По умолчанию: `mainnet`|
+|-e DB_ENGINE|Хранилище индекса. По умолчанию: `rocksdb` — единственный движок, библиотеки которого есть в образе|
+|-e DB_DIRECTORY|Где лежит индекс. По умолчанию: `/data`|
+|-e SERVICES|Что обслуживать, через запятую. По умолчанию: `tcp://:50001,rpc://localhost:8000`. Оставьте запись `rpc://` — она нужна проверке состояния|
+|-e SSL_CERTFILE, -e SSL_KEYFILE|Сертификат и ключ TLS. По умолчанию: самоподписанная пара создаётся в каталоге данных, если `SERVICES` содержит `ssl://`|
+|-e PEER_DISCOVERY|Искать ли другие публичные серверы. По умолчанию: `off` — образ рассчитан на приватный индексатор|
+|-e PEER_ANNOUNCE|Объявлять ли себя в сети серверов. По умолчанию: `false`|
+|-e CACHE_MB|Кэш индексации. По умолчанию: `1200` (значение ElectrumX). Снижайте для небольшой цепочки, повышайте для ускорения первой индексации mainnet|
+
+# Замечания
+
+- **Аутентификации нет никакой.** Любой, кто дотянулся до 50001 или 50002, может
+  запросить произвольный адрес и опубликовать транзакцию. Публикуйте на
+  loopback, а если клиенты — контейнеры той же сети, не публикуйте вовсе.
+- **Индекс от другого образа не читается.** Здесь rocksdb, а
+  `lukechilds/electrumx`, который этот образ заменяет в BitDeals, писал leveldb.
+  Подключите пустой том и дайте проиндексировать заново: для regtest и testnet
+  это быстро, для mainnet — несколько суток.
+- **Демону нужны `txindex=1` и `txospenderindex=1`.** ElectrumX 2.x перед
+  началом работы запрашивает `getindexinfo` и завершается с `RuntimeError`,
+  называя недостающий индекс — по одному за раз, так что после включения
+  `txindex` вы получите то же сообщение про `txospenderindex`. В соседнем
+  [образе bitcoind](https://git.bitdeals.org/private/bitcoind) это
+  `BITCOIND_TXINDEX=1` и `BITCOIND_TXOSPENDERINDEX=1`; на существующем каталоге
+  данных их включение означает переиндексацию демона.
+- **Демон не должен быть обрезанным.** Индексация читает каждый блок; узел с
+  `-prune` приводит к отказу на середине с сообщением об отсутствующем блоке, а
+  не о неверной настройке.
+- **`NET` пишется по-электрумовски, а не по-биткойновски.** Демон называет сети
+  `main`, `test` и `regtest`, ElectrumX — `mainnet`, `testnet` и `regtest`.
+  Точка входа отвергает неизвестное значение, потому что пара обычно
+  настраивается из одного `.env`, и `NET=test` иначе упал бы глубоко внутри
+  поиска класса монеты.
+- **Контейнер становится healthy только когда начинает обслуживать клиентов** —
+  то есть после того, как догнал демона. Первая индексация mainnet занимает
+  несколько суток, и всё это время контейнер будет unhealthy; смотрите логи. На
+  regtest это секунды.
+- **Самоподписанный сертификат создаётся, только если `SERVICES` требует TLS, а
+  файлы не заданы.** Клиентам придётся доверять ему явно. Это плата за то, что
+  ElectrumX отказывается стартовать при запросе `ssl://` без сертификата — не
+  лучший способ узнать, что вы добавили порт.
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..b4f01ba
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,26 @@
+services:
+  electrumx:
+    build:
+      # Repository root, not ./docker: the Dockerfile copies ./docker/run.sh
+      # and ./docker/healthy_check.sh, and those paths are resolved against the
+      # build context.
+      context: .
+      dockerfile: ./docker/Dockerfile
+    image: registry.bitdeals.org/electrumx
+    environment:
+      - COIN=Bitcoin
+      # ElectrumX spelling, not bitcoind's: the daemon calls this chain
+      # "regtest" too, but "main"/"test" there are "mainnet"/"testnet" here.
+      - NET=regtest
+      # The daemon must run with txindex=1 and txospenderindex=1.
+      - DAEMON_URL=http://CHANGE_ME:CHANGE_ME@bitcoind:18443
+      - CACHE_MB=400
+    ports:
+      # No authentication of any kind — loopback only, or nothing at all when
+      # the clients are containers on the same network.
+      - 127.0.0.1:50001:50001
+    volumes:
+      - electrumxdata:/data
+
+volumes:
+  electrumxdata:
diff --git a/docker/Dockerfile b/docker/Dockerfile
new file mode 100644
index 0000000..cb716eb
--- /dev/null
+++ b/docker/Dockerfile
@@ -0,0 +1,74 @@
+# A container for the ElectrumX server
+#
+# ElectrumX indexes a bitcoind and answers the Electrum protocol: address
+# history, UTXOs, transaction broadcast. BitDeals uses it for payment detection
+# (ДС) and for UTXO lookup and broadcast (ГС).
+#
+# Installed from the upstream git tag, pinned below. The venv is built in the
+# first stage with the rocksdb headers, and only the runtime library follows it
+# into the final image.
+
+FROM python:3.14-trixie AS builder
+
+ARG ELECTRUMX_VERSION=2.0.0
+
+WORKDIR /usr/src/app
+
+RUN apt-get update \
+ && apt-get install -yq --no-install-suggests --no-install-recommends \
+    build-essential git librocksdb-dev pkg-config \
+ && rm -rf /var/lib/apt/lists/*
+
+RUN python -m venv venv \
+ && venv/bin/pip install --no-cache-dir \
+    "e_x[rocksdb] @ git+https://github.com/spesmilo/electrumx.git@${ELECTRUMX_VERSION}"
+
+
+FROM python:3.14-slim-trixie
+
+# Electrum protocol, plaintext TCP. SSL is served on 50002 when SERVICES asks
+# for it; the RPC (8000) stays on localhost and is what the health check uses.
+EXPOSE 50001/tcp
+EXPOSE 50002/tcp
+
+ENV USER_UID=2000
+ENV USER_GID=2000
+ENV HOME=/home/electrumx
+# /data, not the home directory: this is the path the image this one replaces
+# (lukechilds/electrumx) used, so a compose file keeps its volume line. The
+# index itself has to be rebuilt anyway — see README, "Notes".
+ENV DB_DIRECTORY=/data
+
+# librocksdb9.10 is the runtime half of librocksdb-dev above; openssl is only
+# for the self-signed certificate the entrypoint generates on demand.
+RUN apt-get update \
+ && apt-get install -yq --no-install-suggests --no-install-recommends \
+    librocksdb9.10 openssl gosu \
+ && rm -rf /var/lib/apt/lists/*
+
+COPY --from=builder /usr/src/app/venv /usr/src/app/venv
+COPY ./docker/run.sh /usr/local/bin/
+COPY ./docker/healthy_check.sh /usr/local/bin/
+
+# Exec-form ENTRYPOINT/HEALTHCHECK targets: a clone on a filesystem that does
+# not carry the executable bit would otherwise build an unstartable image.
+RUN chmod +x /usr/local/bin/run.sh /usr/local/bin/healthy_check.sh
+
+# electrumx_server and electrumx_rpc live in the venv; putting it on PATH keeps
+# both this file and the scripts free of the full path.
+ENV PATH=/usr/src/app/venv/bin:$PATH
+
+# groupadd, not addgroup: the slim images dropped the adduser package.
+RUN groupadd --gid $USER_GID electrumx \
+ && useradd --uid $USER_UID --gid $USER_GID --skel /dev/null --create-home --home-dir $HOME electrumx
+
+VOLUME ${DB_DIRECTORY}
+WORKDIR ${HOME}
+
+ENTRYPOINT ["/usr/local/bin/run.sh"]
+
+# The server starts serving only after it has caught up with the daemon, and on
+# mainnet the first index takes days. The start period covers a restart on an
+# existing index, not a first run — for that, watch the logs.
+HEALTHCHECK --interval=30s --timeout=10s --start-period=300s --retries=3 \
+  CMD ["/usr/local/bin/healthy_check.sh"]
diff --git a/docker/healthy_check.sh b/docker/healthy_check.sh
new file mode 100755
index 0000000..ded43ab
--- /dev/null
+++ b/docker/healthy_check.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+# Healthy = the server answers its own RPC. That happens once it has caught up
+# with the daemon and started serving, which is what callers care about: an
+# ElectrumX still building its index accepts no Electrum sessions at all.
+#
+# The RPC lives on localhost:8000 by default (SERVICES). Overriding SERVICES
+# without an rpc:// entry leaves nothing to ask — see README, "Notes".
+
+set -eu
+
+exec gosu electrumx electrumx_rpc getinfo > /dev/null
diff --git a/docker/run.sh b/docker/run.sh
new file mode 100755
index 0000000..344bbab
--- /dev/null
+++ b/docker/run.sh
@@ -0,0 +1,75 @@
+#!/bin/sh
+
+set -eu
+
+# ElectrumX reads its own configuration from the environment, so this script
+# only fills in defaults and checks the two mistakes that are expensive to
+# diagnose later. Every variable below is ElectrumX's own name, not ours —
+# anything documented upstream works here unchanged.
+
+export COIN="${COIN:-Bitcoin}"
+export NET="${NET:-mainnet}"
+export DB_DIRECTORY="${DB_DIRECTORY:-/data}"
+# Required by ElectrumX 2.0 (it refuses to start without it). rocksdb is what
+# the image ships the libraries for.
+export DB_ENGINE="${DB_ENGINE:-rocksdb}"
+# Plaintext Electrum protocol plus the local RPC the health check talks to.
+# Add ssl://:50002 to serve TLS (see the certificate section below).
+export SERVICES="${SERVICES:-tcp://:50001,rpc://localhost:8000}"
+# Off by default: this image is meant for private indexers behind a known
+# daemon. A node that announces itself to the public server network is a
+# deliberate act — set PEER_DISCOVERY=on and PEER_ANNOUNCE=true for it.
+export PEER_DISCOVERY="${PEER_DISCOVERY:-off}"
+export PEER_ANNOUNCE="${PEER_ANNOUNCE:-false}"
+
+if [ -z "${DAEMON_URL:-}" ]
+then
+	echo "DAEMON_URL is required, e.g. http://user:password@bitcoind:8332" >&2
+	exit 1
+fi
+
+# NET names the coin class ElectrumX looks up, and a wrong one is not a
+# harmless mismatch: the class carries the genesis hash, so a testnet index
+# pointed at a regtest daemon fails at the first block with a message about
+# hashes rather than about configuration. The check exists mostly for one
+# specific typo — bitcoind calls these networks `main` and `test`, ElectrumX
+# calls them `mainnet` and `testnet`, and the pair is usually configured from
+# the same .env.
+case "$NET" in
+	mainnet | testnet | testnet4 | signet | regtest | mutinynet) ;;
+	*)
+		echo "NET must be one of mainnet, testnet, testnet4, signet, regtest, mutinynet (got '$NET')" >&2
+		exit 1
+		;;
+esac
+
+# A named volume starts out owned by root. Non-recursive: only the empty case
+# needs fixing, and a mainnet index is hundreds of gigabytes.
+mkdir -p "$DB_DIRECTORY"
+if [ "$(stat -c %u "$DB_DIRECTORY")" != "$USER_UID" ]
+then
+	chown "$USER_UID:$USER_GID" "$DB_DIRECTORY"
+fi
+
+# TLS on demand. ElectrumX requires both files as soon as SERVICES mentions
+# ssl://, and refuses to start when they are missing — generating a self-signed
+# pair is the difference between "works out of the box" and a startup error
+# nobody expects from adding a port. Clients must trust it explicitly; a real
+# certificate is supplied by pointing SSL_CERTFILE/SSL_KEYFILE elsewhere.
+case "$SERVICES" in
+	*ssl://*)
+		export SSL_CERTFILE="${SSL_CERTFILE:-${DB_DIRECTORY}/electrumx.crt}"
+		export SSL_KEYFILE="${SSL_KEYFILE:-${DB_DIRECTORY}/electrumx.key}"
+		if [ ! -f "$SSL_CERTFILE" ] || [ ! -f "$SSL_KEYFILE" ]
+		then
+			echo "generating a self-signed certificate for $SSL_CERTFILE"
+			openssl req -x509 -newkey rsa:2048 -nodes -days 3650 \
+				-subj "/CN=electrumx" \
+				-keyout "$SSL_KEYFILE" -out "$SSL_CERTFILE" 2>/dev/null
+			chown "$USER_UID:$USER_GID" "$SSL_CERTFILE" "$SSL_KEYFILE"
+			chmod 600 "$SSL_KEYFILE"
+		fi
+		;;
+esac
+
+exec gosu electrumx electrumx_server "$@"