Blockscout
This guide goes into details on how to compile and deploy Blockscout instance to work with Polygon-Edge. Blockscout has its own documentation, but this guide focuses on simple but detailed step-by-step instructions on how to setup Blockscout instance.
- Server Hardware: 2CPU / 4GB RAM / 50GB HDD (LVM)
- Database Server: Dedicated server with 2 CPU / 4GB RAM / 30GB SSD / PostresSQL 13.4
The requirement for following this guide is to have a database server ready, database and db user configured. This guide will not go into details on how to deploy and configure PosgreSQL server. There are plenty of guides on now to do this, for example DigitalOcean Guide
:::info DISCLAMER This guide is meant only to help you to get Blockscout up and running on a single instance which is not ideal production setup.
For production, you'll probably want to introduce reverse proxy, load balancer, scalability options, etc. into the architecture. :::
Before we start we need to make sure we have all the binaries installed that the blockscout is dependent on.
sudo apt update && sudo apt -y upgrade
sudo apt -y install erlang
# go to your home dir
cd ~
# download deb
wget https://packages.erlang-solutions.com/erlang-solutions_2.0_all.deb
# download key
wget https://packages.erlang-solutions.com/ubuntu/erlang_solutions.asc
# install repo
sudo dpkg -i erlang-solutions_2.0_all.deb
# install key
sudo apt-key add erlang_solutions.asc
# remove deb
rm erlang-solutions_2.0_all.deb
# remove key
rm erlang_solutions.asc
sudo curl -sL https://deb.nodesource.com/setup_14.x | sudo -E bash -
sudo curl https://sh.rustup.rs -sSf | sh -s -- -y
sudo apt -y install esl-erlang=1:24.* elixir=1.12.*
sudo apt -y install nodejs
sudo apt -y install cargo
sudo apt -y install automake libtool inotify-tools gcc libgmp-dev make g++ git
sudo apt -y postgresql-client
We need to set the environment variables, before we begin with Blockscout compilation. In this guide we'll set only the basic minimum to get it working. Full list of variables that can be set you can find here
# example: ETHEREUM_JSONRPC_HTTP_URL=https://rpc-testnet.kalychain.io
export ETHEREUM_JSONRPC_HTTP_URL=<your polygon-edge json-rpc endpoint>
# example: ETHEREUM_JSONRPC_TRACE_URL=https://rpc-testnet.kalychain.io
export ETHEREUM_JSONRPC_TRACE_URL=<your polygon-edge json-rpc endpoint>
# example: ETHEREUM_JSONRPC_WS_URL=wss://rpc.poa.psdk.io:8545/ws
export ETHEREUM_JSONRPC_WS_URL=<your polygon-edge websocket endpoint>
# used for automaticaly restarting the service if it crashes
export HEART_COMMAND="systemctl start explorer.service"
# postgresql connection example: DATABASE_URL=postgresql://blockscout:[email protected]:5432/blockscout
export DATABASE_URL=postgresql://<db_user>:<db_pass>@<db_host>:<db_port>/<db_name>
# secret key base as per docs https://docs.blockscout.com/for-developers/manual-deployment ( Step 4 )
export SECRET_KEY_BASE=VTIB3uHDNbvrY0+60ZWgUoUBKDn9ppLR8MI4CpRz4/qLyEFs54ktJfaNT6Z221No
# we set these env vars to test the db connection
export PGPASSWORD=Passw0Rd
export PGUSER=blockscout
export PGHOST=db.instance.local
Now test your DB connection with provided parameters. Since you've provided PG env vars, you should be able to connect to the database only by running:
psql
If the database is configured correctly, you should see a psql prompt:
psql (12.9 (Ubuntu 12.9-0ubuntu0.20.04.1))
SSL connection (protocol: TLSv1.3, cipher: TLS_AES_256_GCM_SHA384, bits: 256, compression: off)
Type "help" for help.
blockscout=>
Otherwise you might see an error like this:
psql: error: FATAL: password authentication failed for user "blockscout"
FATAL: password authentication failed for user "blockscout"
:::info DB Connection Make sure you've sorted out all db connection issues before proceeding to the next part. You'll need to provide superuser privileges to blockscout user. :::
[email protected]:~$ createuser --interactive
Enter name of role to add: blockscout
Shall the new role be a superuser? (y/n) y
Now we finaly get to start the Blockscout installation.
cd ~
git clone https://github.com/poanetwork/blockscout.git
Cd into clone directory and start compiling
cd blockcout
mix local.hex --force
mix do deps.get, local.rebar --force, deps.compile, compile
:::info This part will fail if you didn't setup your DB connection properly, you didn't provide or you've defined wrong parameters at DATABASE_URL environment variable. The database user needs to have superuser privileges. :::
mix do ecto.create, ecto.migrate
You need to change directory to the folder which contains frontend assets.
cd apps/block_scout_web/assets
sudo npm install
sudo node_modules/webpack/bin/webpack.js --mode production
:::info Be patient Compilation of these assets can take a few minutes, and it will display no output. It can look like the process is stuck, but just be patient. When compile process is finished, it should output something like:
webpack 5.69.1 compiled with 3 warnings in 104942 ms :::For this step you need to return to the root of your Blockscout clone folder.
cd ~/blockscout
sudo mix phx.digest
cd apps/block_scout_web
mix phx.gen.cert blockscout blockscout.local
In this part we need to setup a system service as we want Blockscout to run in the backround and persist after system reboot.
sudo touch /etc/systemd/system/explorer.service
Use your favorite linux text editor to edit this file and configure the service.
sudo vi /etc/systemd/system/explorer.service
The contents of the explorer.service file should look like this:
[Unit]
Description=Blockscout Server
After=network.target
StartLimitIntervalSec=0
[Service]
Type=simple
Restart=always
RestartSec=1
User=root
StandardOutput=syslog
StandardError=syslog
WorkingDirectory=/usr/local/blockscout
ExecStart=/usr/bin/mix phx.server
EnvironmentFile=/usr/local/blockscout/env_vars.env
[Install]
WantedBy=multi-user.target
sudo systemctl daemon-reload
sudo systemctl enable explorer.service
Blockscout service needs to have access to the folder you've cloned from Blockscout repo and compiled all the assets.
sudo mv ~/blockscout /usr/local
:::info Use the same environment variables as you've set in Part 2. :::
sudo touch /usr/local/blockscout/env_vars.env
# use your favorite text editor
sudo vi /usr/local/blockscout/env_vars.env
# env_vars.env file should hold these values ( adjusted for your environment )
ETHEREUM_JSONRPC_HTTP_URL=https://rpc-testnet.kalychain.io
ETHEREUM_JSONRPC_TRACE_URL=https://rpc-testnet.kalychain.io
DATABASE_URL=postgresql://blockscout:[email protected]:5432/blockscout
SECRET_KEY_BASE=VTIB3uHDNbvrY0+60ZWgUoUBKDn9ppLR8MI4CpRz4/qLyEFs54ktJfaNT6Z221No
HEART_COMMAND="systemctl start explorer.service"
Save the file and exit.
sudo systemctl start explorer.service
Now all thats left to do is to check if Blockscout service is running. Check service status with:
sudo systemctl status explorer.service
To check service output:
sudo journalctl -u explorer.service
You can check if there are some new listening ports:
# if netstat is not installed
sudo apt install net-tools
sudo netstat -tulpn
You should get a list of listening ports and on the list there should be something like this:
tcp 0 0 0.0.0.0:5432 0.0.0.0:* LISTEN 28142/postgres
tcp 0 0 0.0.0.0:4000 0.0.0.0:* LISTEN 42148/beam.smp
tcp 0 0 0.0.0.0:4001 0.0.0.0:* LISTEN 42148/beam.smp
Blockscout web service runs by default on ports
4000(http) and 4001(https). If everythig is ok, you should be able to access the Blockscout web portal with http://<host_ip>:4000 or https://<host_ip>:4001We've just deployed a single Blockscout instance, which works fine, but for production you should consider placing this instance behind a reverse proxy like Nginx. You sould also think about database and instance scalability, depending on your use case.
You should definitely checkout the official Blockscout documentation as there a lot of customisation options.
Last modified 4mo ago