This option is preferred if you want to modify the UI and/or have more control over the frontend.
You will use the external-frontend.yml file.

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Prerequisites

  • Docker v20.10+
  • Docker-compose 2.x.x+
  • Running Ethereum JSON RPC client
Please see https://github.com/blockscout/blockscout/tree/master/docker-compose for additional information

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Migration

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1) Install frontend separately

Configure the app by passing the necessary environment variables when starting the Docker container.Information about ENVs is available here. 
docker run -p 3000:3000 --env-file <path-to-your-env-file> ghcr.io/blockscout/frontend:latest
Alternatively, you can build your own docker image and run your app using that container. Please follow this guide.

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2) Pull changes from the Blockscout master branch

We assume Blockscout is already deployed in your environment. 
git pull origin master

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3) Navigate to the docker compose folder

cd docker-compose

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4) Adjust backend envs for your instance

Replace the example environment variables in the external-frontend.yml file. 
cat external-frontend.yml
By default, ENV variables are set to testing settings (anvil) in the environment: list. Replace with env vars from your existing backend. The only one you NEED to keep is API_V2_ENABLED='true' . Any values added here will override existing variables in your instance when you start the container. 
environment:
        ETHEREUM_JSONRPC_VARIANT: 'anvil'
        ETHEREUM_JSONRPC_HTTP_URL: http://host.docker.internal:8545/
        ETHEREUM_JSONRPC_WS_URL: ws://host.docker.internal:8545/
        INDEXER_DISABLE_INTERNAL_TRANSACTIONS_FETCHER: 'true'
        INDEXER_DISABLE_PENDING_TRANSACTIONS_FETCHER: 'true'
        DATABASE_URL: postgresql://postgres:@host.docker.internal:7432/blockscout?ssl=false
        ECTO_USE_SSL: 'false'
        SECRET_KEY_BASE: '56NtB48ear7+wMSf0IQuWDAAazhpb31qyc7GiyspBP2vh7t5zlCsF5QDv76chXeN'
        CHAIN_ID: '1337'
        API_V2_ENABLED: 'true'
        MIX_ENV: 'prod'

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5) Run docker compose with FRONT_PROXY_PASS variable.

You will pass in the frontend proxy url when running docker compose. The standard configuration for the frontend is http://host.docker.internal:3000 but if you’ve made any changes pass in your url. Run all containers (up) and run processes in the background (-d). 
FRONT_PROXY_PASS=http://host.docker.internal:3000 docker compose -f external-frontend.yml up -d
Check progress and view containers: 
Docker ps
You should see the following containers:

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6) Check the proxy configuration

cd proxy
Cat default.conf.template
Unless you overrode the default configs (or did not provide the FRONT_PROXY_PASS variable) , you will see the default port for the backend default is 4000, and 3000 for the frontend. However, with the proxy setup the whole application will default to port 80 (which is just localhost). Your instance should now be served on localhost. More details about the recommended proxy setup.
It may take several minutes for the frontend to propagate during this process.

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7) Adjust frontend ENVs if needed

There are several required ENVs for the frontend. If required variables are missing or invalid the frontend will show in error message and will not run the app. To adjust, stop the frontend container, update the env file (or pass variables directly), and restart the container.

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8) Check Microservice ENVs

Typically the default values will provide what you need for the common-visualizer.env, common-stats.env, and common-smart-contract-verifier.env files. Note that in the smart-contract-verifier.envs the SMART_CONTRACT_VERIFIER__SOLIDITY__FETCHER__LIST__LIST_URL variable is different depending on your OS. The default is Linux, if you are running macOS or Windows be sure to comment out the appropriate variables.