¶ Electrs
Electrs is an efficient re-implementation of Electrum Server in Rust, inspired by ElectrumX, Electrum Personal Server, and bitcoincore-indexd.
{% hint style="warning" %}
Difficulty: Medium
¶ Requirements
- Bitcoin Core
- Others
¶ Preparations
-> Make sure that you have followed the Activate mempool & reduce 'dbcache' after a full sync section.
¶ Install dependencies
- With user
admin, update the packages and upgrade to keep up to date with the OS
sudo apt update && sudo apt full-upgrade
- Make sure that all necessary software packages are installed
sudo apt install libgflags-dev libsnappy-dev zlib1g-dev libbz2-dev liblz4-dev libzstd-dev clang llvm-dev libclang-dev make g++ cmake build-essential
- Install the
librocksdb v7.8.3from the source code. Go to the temporary folder
cd /tmp
- Clone the rocksdb GitHub repository and enter the
rocksdbfolder
git clone -b v9.10.0 --depth 1 https://github.com/facebook/rocksdb && cd rocksdb
- Compile it
make shared_lib -j $(nproc)
Expected output ⬇️
$DEBUG_LEVEL is 0
$DEBUG_LEVEL is 0
CC cache/cache.o
CC cache/cache_entry_roles.o
CC cache/cache_key.o
CC cache/cache_reservation_manager.o
CC cache/charged_cache.o
CC cache/clock_cache.o
CC cache/fast_lru_cache.o
CC cache/lru_cache.o
CC cache/compressed_secondary_cache.o
CC cache/sharded_cache.o
CC db/arena_wrapped_db_iter.o
CC db/blob/blob_contents.o
CC db/blob/blob_fetcher.o
CC db/blob/blob_file_addition.o
CC db/blob/blob_file_builder.o
CC db/blob/blob_file_cache.o
CC db/blob/blob_file_garbage.o
[...]
{% hint style="info" %}
This process can take several minutes, 10-15 minutes, or more, depending on the performance of your device. Please be patient until the prompt shows again
- Install it
sudo make install-shared
Expected output ⬇️
$DEBUG_LEVEL is 0
echo 'prefix=/usr/local' > rocksdb.pc
echo 'exec_prefix=${prefix}' >> rocksdb.pc
echo 'includedir=${prefix}/include' >> rocksdb.pc
echo 'libdir=/usr/local/lib' >> rocksdb.pc
echo '' >> rocksdb.pc
echo 'Name: rocksdb' >> rocksdb.pc
echo 'Description: An embeddable persistent key-value store for fast storage' >> rocksdb.pc
echo Version: 7.8.3 >> rocksdb.pc
echo 'Libs: -L${libdir} -ldl -Wl,-rpath -Wl,'$ORIGIN' -lrocksdb' >> rocksdb.pc
echo 'Libs.private: -lpthread -lrt -ldl -lsnappy -lgflags -lz -lbz2 -llz4 -lzstd ' >> rocksdb.pc
echo 'Cflags: -I${includedir} -std=c++17 -faligned-new -DHAVE_ALIGNED_NEW -DROCKSDB_PLATFORM_POSIX -DROCKSDB_LIB_IO_POSIX -DOS_LINUX -fno-builtin-memcmp -DROCKSDB_FALLOCATE_PRESENT -DSNAPPY -DGFLAGS=1 -DZLIB -DBZIP2 -DLZ4 -DZSTD -DROCKSDB_MALLOC_USABLE_SIZE -DROCKSDB_PTHREAD_ADAPTIVE_MUTEX -DROCKSDB_BACKTRACE -DROCKSDB_RANGESYNC_PRESENT -DROCKSDB_SCHED_GETCPU_PRESENT -DROCKSDB_AUXV_GETAUXVAL_PRESENT -DHAVE_UINT128_EXTENSION -isystem third-party/gtest-1.8.1/fused-src' >> rocksdb.pc
echo 'Requires: ' >> rocksdb.pc
install -d /usr/local/lib
install -d /usr/local/lib/pkgconfig
for header_dir in `find "include/rocksdb" -type d`; do \
install -d //usr/local/$header_dir; \
done
for header in `find "include/rocksdb" -type f -name *.h`; do \
install -C -m 644 $header //usr/local/$header; \
done
for header in ; do \
install -d //usr/local/include/rocksdb/`dirname $header`; \
install -C -m 644 $header //usr/local/include/rocksdb/$header; \
done
install -C -m 644 rocksdb.pc /usr/local/lib/pkgconfig/rocksdb.pc
install -d /usr/local/lib
install -C -m 755 librocksdb.so.7.8.3 /usr/local/lib
ln -fs librocksdb.so.7.8.3 /usr/local/lib/librocksdb.so.7.8
ln -fs librocksdb.so.7.8.3 /usr/local/lib/librocksdb.so.7
ln -fs librocksdb.so.7.8.3 /usr/local/lib/librocksdb.so
- Update the shared library cache. Wait until the prompt comes back to show
sudo ldconfig
- Come back to the
/tmpfolder
cd ..
- Delete
rocksdbfolder
sudo rm -r rocksdb
¶ Install Rustc (Cargo included)
- Check if you already have
Rustcinstalled
rustc --version
Expected output:
rustc 1.71.0 (8ede3aae2 2023-07-12)
- And cargo installed
cargo -V
Expected output:
cargo 1.71.0 (cfd3bbd8f 2023-06-08)
{% hint style="warning" %}
If you obtain "command not found" outputs, you need to follow the Rustup + Cargo bonus section to install it, and then come back to continue with the guide
¶ Reverse proxy & Firewall
In the Security section, we already set up Nginx as a reverse proxy. Now we can add the Electrs configuration.
- With user
admin, create the reverse proxy configuration
sudo nano /etc/nginx/streams-available/electrs-reverse-proxy.conf
- Paste the following complete configuration. Save and exit
upstream electrs {
server 127.0.0.1:50021;
}
server {
listen 50022 ssl;
proxy_pass electrs;
}
- Create the symbolic link that points to the directory
streams-enabled
sudo ln -s /etc/nginx/streams-available/electrs-reverse-proxy.conf /etc/nginx/streams-enabled/
- Test the Nginx configuration
sudo nginx -t
Expected output:
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
- Reload the Nginx configuration to apply changes
sudo systemctl reload nginx
- Configure the firewall to allow incoming requests to the SSL and TCP ports
sudo ufw allow 50022/tcp comment 'allow Electrs SSL from anywhere'
sudo ufw allow 50021/tcp comment 'allow Electrs TCP from anywhere'
¶ Installation
There are no precompiled binaries available for Electrs, so we should compile the application ourselves.
¶ Build from the source code
- With user
admin, go to the temporary folder
cd /tmp
- Set a temporary version of the environment variable for the installation
VERSION=0.11.0
- Download the source code and go to the
electrsfolder
git clone --branch v$VERSION https://github.com/romanz/electrs.git && cd electrs
- To avoid using bad source code, verify that the release has been properly signed by the main developer, Roman ZeydeCustomise
curl https://romanzey.de/pgp.txt | gpg --import
Expected output:
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 1255 100 1255 0 0 3562 0 --:--:-- --:--:-- --:--:-- 3555
gpg: key 87CAE5FA46917CBB: public key "Roman Zeyde <me@romanzey.de>" imported
gpg: Total number processed: 1
gpg: imported: 1
- Verify the release
git verify-tag v$VERSION
Expected output:
gpg: Signature made Thu 03 Nov 2022 03:37:23 PM UTC
gpg: using ECDSA key 15C8C3574AE4F1E25F3F35C587CAE5FA46917CBB
gpg: issuer "me@romanzey.de"
gpg: Good signature from "Roman Zeyde <me@romanzey.de>" [unknown]
gpg: aka "Roman Zeyde <roman.zeyde@gmail.com>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg: There is no indication that the signature belongs to the owner.
Primary key fingerprint: 15C8 C357 4AE4 F1E2 5F3F 35C5 87CA E5FA 4691 7CBB
- Now compile the source code into an executable binary
ROCKSDB_INCLUDE_DIR=/usr/local/include ROCKSDB_LIB_DIR=/usr/local/lib cargo build --locked --release
Example of expected output 🔽
info: syncing channel updates for '1.63.0-x86_64-unknown-linux-gnu'
info: latest update on 2022-08-11, rust version 1.63.0 (4b91a6ea7 2022-08-08)
info: downloading component 'cargo'
info: downloading component 'clippy'
info: downloading component 'rust-docs'
info: downloading component 'rust-std'
info: downloading component 'rustc'
info: downloading component 'rustfmt'
info: installing component 'cargo'
info: installing component 'clippy'
info: installing component 'rust-docs'
info: installing component 'rust-std'
info: installing component 'rustc'
info: installing component 'rustfmt'
Updating crates.io index
Downloaded hex_lit v0.1.1
Downloaded humantime v2.1.0
Downloaded bitflags v1.3.2
Downloaded getrandom v0.2.10
Downloaded rand_chacha v0.3.1
Downloaded is-terminal v0.4.7
Downloaded lock_api v0.4.10
Downloaded libloading v0.7.4
Downloaded jsonrpc v0.14.1
Downloaded jobserver v0.1.26
Downloaded thiserror-impl v1.0.40
Downloaded autocfg v1.1.0
Downloaded dirs-sys-next v0.1.2
Downloaded dirs-next v2.0.0
Downloaded httpdate v1.0.2
Downloaded configure_me v0.4.0
Downloaded lazycell v1.3.0
Downloaded num_cpus v1.16.0
[...]
{% hint style="info" %}
This process can take quite a long time, 10-15 minutes or more, depending on the performance of your device. Please be patient until the prompt shows again
- Install it
sudo install -m 0755 -o root -g root -t /usr/local/bin ./target/release/electrs
- Check the correct installation
electrs --version
Example of expected output:
v0.10.0
- (Optional) Delete the temporal
electrsfolder
sudo rm -r /tmp/electrs
- Return to the home folder
cd
{% hint style="success" %}
If you come to update, this is the final step
¶ Create the electrs user & group
- Create the
electrsuser
sudo adduser --disabled-password --gecos "" electrs
- Make to the
electrsuser a member of the "bitcoin" group
sudo adduser electrs bitcoin
- Create the Electrs data directory
sudo mkdir /data/electrs
- Assign the owner to the
electrsuser
sudo chown electrs:electrs /data/electrs
¶ Configuration
- Switch to the
electrsuser
sudo su - electrs
- Create the electrs config file
nano /data/electrs/electrs.conf
- Enter the complete next content
# MiniBolt: electrs configuration
# /data/electrs/electrs.conf
# Bitcoin Core settings
network = "bitcoin"
cookie_file= "/data/bitcoin/.cookie"
# Electrs settings
electrum_rpc_addr = "0.0.0.0:50021"
db_dir = "/data/electrs/db"
server_banner = "Welcome to electrs (Electrum Rust Server) running on a MiniBolt node!"
skip_block_download_wait = true
# Allow concurrent DB background operations. i.e. for 4 threads max use.
# Customise with your available threads.
db_parallelism=4
# Logging
log_filters = "INFO"
- Exit
electrsuser session to return to theadminuser session
exit
¶ Create systemd service
- As user
admin, create the Electrs systemd unit
sudo nano /etc/systemd/system/electrs.service
- Enter the following complete configuration. Save and exit
# MiniBolt: systemd unit for electrs
# /etc/systemd/system/electrs.service
[Unit]
Description=Electrs
Requires=bitcoind.service
After=bitcoind.service
[Service]
ExecStart=/usr/local/bin/electrs --conf /data/electrs/electrs.conf --skip-default-conf-files
# Process management
####################
Type=simple
TimeoutSec=300
KillMode=process
# Directory creation and permissions
####################################
RuntimeDirectory=electrs
RuntimeDirectoryMode=0710
User=electrs
Group=electrs
# Hardening Measures
####################
PrivateTmp=true
ProtectSystem=full
ProtectHome=true
PrivateDevices=true
MemoryDenyWriteExecute=true
[Install]
WantedBy=multi-user.target
- Enable autoboot (optional)
sudo systemctl enable electrs
- Prepare "electrs" monitoring by the systemd journal and check the log output. You can exit monitoring at any time with
Ctrl-C
journalctl -fu electrs
¶ Run
To keep an eye on the software movements, start your SSH program (eg, PuTTY) a second time, connect to the MiniBolt node, and log in as admin
- Start the service
sudo systemctl start electrs
- Monitor the systemd journal at the first session created to check if everything works fine
Example of expected output on the first terminal with journalctl -fu electrs ⬇️
Starting electrs 0.10.0 on x86_64 linux with Config { network: Bitcoin, db_path: "/data/electrs/db/bitcoin", daemon_dir: "/data/bitcoin", daemon_auth: CookieFile("/data/bitcoin/.cookie"), daemon_rpc_addr: 127.0.0.1:8332, daemon_p2p_addr: 127.0.0.1:8333, electrum_rpc_addr: 0.0.0.0:50021, monitoring_addr: 127.0.0.1:4224, wait_duration: 10s, jsonrpc_timeout: 15s, index_batch_size: 10, index_lookup_limit: None, reindex_last_blocks: 0, auto_reindex: true, ignore_mempool: false, sync_once: false, disable_electrum_rpc: false, server_banner: "Welcome to electrs (Electrum Rust Server) running on a MiniBolt node!", args: [] }
[2021-11-09T07:09:42.744Z INFO electrs::metrics::metrics_impl] serving Prometheus metrics on 127.0.0.1:4224
[2021-11-09T07:09:42.744Z INFO electrs::server] serving Electrum RPC on 0.0.0.0:50021
[2021-11-09T07:09:42.812Z INFO electrs::db] "/data/electrs/db/bitcoin": 0 SST files, 0 GB, 0 Grows
[2021-11-09T07:09:43.174Z INFO electrs::index] indexing 2000 blocks: [1..2000]
[2021-11-09T07:09:44.665Z INFO electrs::chain] chain updated: tip=00000000dfd5d65c9d8561b4b8f60a63018fe3933ecb131fb37f905f87da951a, height=2000
[2021-11-09T07:09:44.986Z INFO electrs::index] indexing 2000 blocks: [2001..4000]
[2021-11-09T07:09:46.191Z INFO electrs::chain] chain updated: tip=00000000922e2aa9e84a474350a3555f49f06061fd49df50a9352f156692a842, height=4000
[2021-11-09T07:09:46.481Z INFO electrs::index] indexing 2000 blocks: [4001..6000]
[2021-11-09T07:09:47.581Z INFO electrs::chain] chain updated: tip=00000000dbbb79792303bdd1c6c4d7ab9c21bba0667213c2eca955e11230c5a5, height=6000
[2021-11-09T07:09:46.481Z INFO electrs::index] indexing 2000 blocks: [6001..8000]
[2021-11-09T07:09:47.581Z INFO electrs::chain] chain updated: tip=00000000dbbb79792303bdd1c6c4d7ab9c21bba0667213c2eca955e11230c5a6, height=8000
[2021-11-09T07:09:46.481Z INFO electrs::index] indexing 2000 blocks: [8001..10000]
[2021-11-09T07:09:47.581Z INFO electrs::chain] chain updated: tip=00000000dbbb79792303bdd1c6c4d7ab9c21bba0667213c2eca955e11230c5a7, height=10000
[...]
[2021-11-09T07:09:46.481Z INFO electrs::index] indexing 65 blocks: [756001..756065]
[2021-11-09T07:09:47.581Z INFO electrs::chain] chain updated: tip=00000000dbbb79792303bdd1c6c4d7ab9c21bba0667213c2eca955e11230c510, height=756065
[2021-11-09T07:09:47.581Z INFO electrs::db] starting config compaction
[2021-11-09T07:09:47.581Z INFO electrs::db] starting headers compaction
[2021-11-09T07:09:47.581Z INFO electrs::db] starting txid compaction
[2021-11-09T07:09:47.581Z INFO electrs::db] starting funding compaction
[2021-11-09T07:09:47.581Z INFO electrs::db] starting spending compaction
[...]
{% hint style="success" %}
Congrats! Now you have a self-hosted Electrum Server on your node. Now you can process installing the Blockchain Explorer: BTC RPC Explorer, or connect your Desktop signing app: Sparrow Wallet or Electrum Wallet Desktop
¶ Validation
- Ensure electrs service is working and listening on the default TCP
50021port and the monitoring14224port (not used on MiniBolt)
sudo ss -tulpn | grep electrs
Expected output:
tcp LISTEN 0 128 0.0.0.0:50021 0.0.0.0:* users:(("electrs",pid=54749,fd=4))
tcp LISTEN 0 128 127.0.0.1:14224 0.0.0.0:* users:(("electrs",pid=54749,fd=3))
- And the SSL
50022port
sudo ss -tulpn | grep 50022
Expected output:
tcp LISTEN 0 511 0.0.0.0:50022 0.0.0.0:* users:(("nginx",pid=719,fd=5),("nginx",pid=718,fd=5),("nginx",pid=717,fd=5),("nginx",pid=716,fd=5),("nginx",pid=715,fd=5))
{% hint style="info" %}
Electrs must first fully index the blockchain and compact its database before you can connect to it with your wallets. This can take a few hours. Only proceed with the next section once Electrs is ready
¶ Extras (optional)
¶ Remote access over Tor
To use your Electrum server when you're on the go, you can easily create a Tor hidden service. This way, you can connect the BitBoxApp or Electrum wallet remotely, or even share the connection details with friends and family. Note that the remote device needs to have Tor installed as well.
- With the user
admin, edit thetorrcfile
sudo nano +63 /etc/tor/torrc --linenumbers
- Add the following lines in the "location hidden services" section, below "
## This section is just for location-hidden services ##" in the torrc file. Save and exit
# Hidden Service Electrs TCP & SSL
HiddenServiceDir /var/lib/tor/hidden_service_electrs_tcp_ssl/
HiddenServiceEnableIntroDoSDefense 1
HiddenServicePoWDefensesEnabled 1
HiddenServicePort 50021 127.0.0.1:50021
HiddenServicePort 50022 127.0.0.1:50022
- Reload the Tor configuration to apply changes
sudo systemctl reload tor
- Get your Onion address
sudo cat /var/lib/tor/hidden_service_electrs_tcp_ssl/hostname
Expected output:
abcdefg..............xyz.onion
{% hint style="info" %}
You should now be able to connect to your Electrs server remotely via Tor using your hostname and port 50022 (SSL) , or 50021 (TCP)
¶ Migrate BTC RPC Explorer to Electrs API connection
To get address balances, either an Electrum server or an external service is necessary. Your local Electrs server can provide address transaction lists, balances, and more.
- As user
admin, open thebtcrpcexplorerservice
sudo nano /etc/systemd/system/btcrpcexplorer.service
- Replace the
fulcrum.servicewith theelectrs.service. Save and exit
Requires=bitcoind.service electrs.service
After=bitcoind.service electrs.service
- Restart the BTC RPC Explorer service to apply the changes
sudo systemctl restart btcrpcexplorer
¶ Upgrade
- First, ensure that you have the latest Rustc version, following the Upgrade section of the Rustup + Cargo bonus guide
- Follow the complete Build from the source code section
- When you finish, restart Electrs to apply the new version
sudo systemctl restart electrs
- Check logs and pay attention to the next log if that refers to the new version installed, and no error logs
journalctl -fu electrs
Example of expected output ⬇️
Starting electrs 0.10.0 on x86_64 linux with Config { network: Bitcoin, db_path: "/data/electrs/db/bitcoin", daemon_dir: "/data/bitcoin", daemon_auth: CookieFile("/data/bitcoin/.cookie"), daemon_rpc_addr: 127.0.0.1:8332, daemon_p2p_addr: 127.0.0.1:8333, electrum_rpc_addr: 0.0.0.0:50021, monitoring_addr: 127.0.0.1:4224, wait_duration: 10s, jsonrpc_timeout: 15s, index_batch_size: 10, index_lookup_limit: None, reindex_last_blocks: 0, auto_reindex: true, ignore_mempool: false, sync_once: false, disable_electrum_rpc: false, server_banner: "Welcome to electrs (Electrum Rust Server) running on a MiniBolt node!", args: [] }
[2021-11-09T07:09:42.744Z INFO electrs::metrics::metrics_impl] serving Prometheus metrics on 127.0.0.1:4224
[2021-11-09T07:09:42.744Z INFO electrs::server] serving Electrum RPC on 0.0.0.0:50021
[2021-11-09T07:09:42.812Z INFO electrs::db] "/data/electrs/db/bitcoin": 0 SST files, 0 GB, 0 Grows
[2021-11-09T07:09:43.174Z INFO electrs::index] indexing 2000 blocks: [1..2000]
[2021-11-09T07:09:44.665Z INFO electrs::chain] chain updated: tip=00000000dfd5d65c9d8561b4b8f60a63018fe3933ecb131fb37f905f87da951a, height=2000
[2021-11-09T07:09:44.986Z INFO electrs::index] indexing 2000 blocks: [2001..4000]
[2021-11-09T07:09:46.191Z INFO electrs::chain] chain updated: tip=00000000922e2aa9e84a474350a3555f49f06061fd49df50a9352f156692a842, height=4000
[2021-11-09T07:09:46.481Z INFO electrs::index] indexing 2000 blocks: [4001..6000]
[2021-11-09T07:09:47.581Z INFO electrs::chain] chain updated: tip=00000000dbbb79792303bdd1c6c4d7ab9c21bba0667213c2eca955e11230c5a5, height=6000
[2021-11-09T07:09:46.481Z INFO electrs::index] indexing 2000 blocks: [6001..8000]
[2021-11-09T07:09:47.581Z INFO electrs::chain] chain updated: tip=00000000dbbb79792303bdd1c6c4d7ab9c21bba0667213c2eca955e11230c5a6, height=8000
[2021-11-09T07:09:46.481Z INFO electrs::index] indexing 2000 blocks: [8001..10000]
[2021-11-09T07:09:47.581Z INFO electrs::chain] chain updated: tip=00000000dbbb79792303bdd1c6c4d7ab9c21bba0667213c2eca955e11230c5a7, height=10000
[...]
[2021-11-09T07:09:46.481Z INFO electrs::index] indexing 65 blocks: [756001..756065]
[2021-11-09T07:09:47.581Z INFO electrs::chain] chain updated: tip=00000000dbbb79792303bdd1c6c4d7ab9c21bba0667213c2eca955e11230c510, height=756065
[2021-11-09T07:09:47.581Z INFO electrs::db] starting config compaction
[2021-11-09T07:09:47.581Z INFO electrs::db] starting headers compaction
[2021-11-09T07:09:47.581Z INFO electrs::db] starting txid compaction
[2021-11-09T07:09:47.581Z INFO electrs::db] starting funding compaction
[2021-11-09T07:09:47.581Z INFO electrs::db] starting spending compaction
[...]
¶ Uninstall
¶ Uninstall service
- With the user
admin, stop electrs
sudo systemctl stop electrs
- Disable autoboot (if enabled)
sudo systemctl disable electrs
- Delete the service
sudo rm /etc/systemd/system/electrs.service
¶ Delete user & group
- Ensure you are logged in as the user
admin. Delete theelectrsuser.
Don't worry aboutuserdel: electrs mail spool (/var/mail/electrs) not foundoutput, the uninstall has been successful
sudo userdel -rf electrs
¶ Delete data directory
- Delete the electrs directory
sudo rm -rf /data/electrs
¶ Uninstall Tor hidden service
- Ensure that you are logged in as the user
admin, edit thetorrcconfig file
sudo nano +63 /etc/tor/torrc --linenumbers
- Delete or comment on the following lines in the "location hidden services" section, below "
## This section is just for location-hidden services ##" in the torrc file. Save and exit
# Hidden Service Electrs TCP & SSL
#HiddenServiceDir /var/lib/tor/hidden_service_electrs_tcp_ssl/
#HiddenServiceEnableIntroDoSDefense 1
#HiddenServicePoWDefensesEnabled 1
#HiddenServicePort 50021 127.0.0.1:50021
#HiddenServicePort 50022 127.0.0.1:50022
- Reload the Tor configuration to apply changes
sudo systemctl reload tor
¶ Uninstall reverse proxy & FW configuration
- Ensure you are logged in as the user
admin, delete the reverse proxy config file
sudo rm /etc/nginx/sites-available/electrs-reverse-proxy.conf
- Delete the symbolic link
sudo rm /etc/nginx/sites-enabled/electrs-reverse-proxy.conf
- Test Nginx configuration
sudo nginx -t
Expected output:
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful
- Reload the Nginx configuration to apply changes
sudo systemctl reload nginx
- Display the UFW firewall rules, and note the numbers of the rules for Electrs (e.g., X and Y below)
sudo ufw status numbered
Expected output:
[Y] 50021 ALLOW IN Anywhere # allow Electrs TCP from anywhere
[X] 50022 ALLOW IN Anywhere # allow Electrs SSL from anywhere
- Delete the rule with the correct number and confirm with "
yes" and enter
sudo ufw delete X
¶ Port reference
| Port | Protocol | Use |
|---|---|---|
| 50021 | TCP | Default port |
| 50022 | SSL | Encrypted port |