Client Settings (Parity, Geth, Ganache)

Supported Clients
BlockScout currently supports Parity, Geth, and Ganache clients. To define the node variant, it's advised to define the ETHEREUM_JSONRPC_VARIANT environment variable. Correct values include:
parity (default)
geth
ganache
BlockScout currently requires a full archive node in order to import every state change for every address on the target network.
Development
Explorer: https://github.com/poanetwork/blockscout/blob/master/apps/explorer/config/dev.exs​
Indexer: https://github.com/poanetwork/blockscout/blob/master/apps/indexer/config/dev.exs​
variant =
  if is_nil(System.get_env("ETHEREUM_JSONRPC_VARIANT")) do
    "ganache"
  else
    System.get_env("ETHEREUM_JSONRPC_VARIANT")
    |> String.split(".")
    |> List.last()
    |> String.downcase()
  end
Production
Explorer: https://github.com/poanetwork/blockscout/blob/master/apps/explorer/config/dev.exs​
Indexer: https://github.com/poanetwork/blockscout/blob/master/apps/indexer/config/prod.exs​
variant =
  if is_nil(System.get_env("ETHEREUM_JSONRPC_VARIANT")) do
    "parity"
  else
    System.get_env("ETHEREUM_JSONRPC_VARIANT")
    |> String.split(".")
    |> List.last()
    |> String.downcase()
  end
Parity Client
--jsonrpc-interface all --jsonrpc-apis web3,eth,net,parity,pubsub,traces --ws-interface all --fat-db=on --pruning=archive --ws-apis all --ws-origins all --ws-hosts all
Name
Environment Variable
Default Value
Description
HTTP Endpoint
ETHEREUM_JSONRPC_HTTP_URL
​http://localhost:8545​
The HTTP Endpoint is used to fetch blocks, transactions, receipts, coin/token balances.
Tracing Endpoint
ETHEREUM_JSONRPC_TRACE_URL
​http://localhost:8545​
The Tracing endpoint is used to fetch internal transactions and block traces. In most cases this endpoint is identical to the HTTP Endpoint.
WebSockets Endpoint
ETHEREUM_JSONRPC_WS_URL
ws://localhost:8546
The WebSockets endpoint subscribes to newHeads which alerts the indexer to fetch the new block from the subscription.
Development
Explorer: https://github.com/poanetwork/blockscout/blob/59d8423e7ca3f608dbea411d4a0dc9bb4662a891/apps/explorer/config/dev/parity.exs#L8-L22 
Indexer: https://github.com/poanetwork/blockscout/blob/59d8423e7ca3f608dbea411d4a0dc9bb4662a891/apps/indexer/config/dev/parity.exs#L9-L23​
Production
Explorer: https://github.com/poanetwork/blockscout/blob/59d8423e7ca3f608dbea411d4a0dc9bb4662a891/apps/explorer/config/prod/parity.exs#L8-L22​
Indexer: https://github.com/poanetwork/blockscout/blob/59d8423e7ca3f608dbea411d4a0dc9bb4662a891/apps/indexer/config/prod/parity.exs#L9-L23​
Geth Client
sudo /usr/bin/geth --rpc --rpcaddr 0.0.0.0 --port 30303 --rpcport 8545 --rpcapi debug,net,eth,shh,web3,txpool --wsapi "eth,net,web3,network,debug,txpool" --ws --wsaddr 0.0.0.0 --wsport 8546 --wsorigins "*" --rinkeby --datadir=/rinkeby --syncmode=full --gcmode=archive --rpcvhosts=*
Tracing and pruning: By default, state for the last 128 blocks kept in memory. Most states are garbage collected. If you are running a block explorer or other service relying on transaction tracing without an archive node (--gcmode=archive), you need to trace within this window! Alternatively, specify the "reexec" tracer option to allow regenerating historical state; and ideally switch to chain tracing which amortizes overhead across all traced blocks.
Name
Environment Variable
Default Value
Description
HTTP Endpoint
ETHEREUM_JSONRPC_HTTP_URL
​http://localhost:8545​
The HTTP Endpoint is used to fetch blocks, transactions, receipts, coin/token balances.
WebSockets Endpoint
ETHEREUM_JSONRPC_WS_URL
ws://localhost:8546
The WebSockets endpoint subscribes to newHeads which alerts the indexer to fetch the new block from the subscription.
Development
Explorer: https://github.com/poanetwork/blockscout/blob/59d8423e7ca3f608dbea411d4a0dc9bb4662a891/apps/explorer/config/dev/geth.exs#L8-L17​
Indexer: https://github.com/poanetwork/blockscout/blob/59d8423e7ca3f608dbea411d4a0dc9bb4662a891/apps/indexer/config/dev/geth.exs#L9-L18 
Production
Explorer: https://github.com/poanetwork/blockscout/blob/59d8423e7ca3f608dbea411d4a0dc9bb4662a891/apps/explorer/config/prod/geth.exs#L8-L17​
Indexer: https://github.com/poanetwork/blockscout/blob/59d8423e7ca3f608dbea411d4a0dc9bb4662a891/apps/indexer/config/prod/geth.exs#L9-L18​

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Name	Environment Variable	Default Value	Description
HTTP Endpoint	`ETHEREUM_JSONRPC_HTTP_URL`	http://localhost:8545	The HTTP Endpoint is used to fetch `blocks`, `transactions`, `receipts`, `coin/token balances`.
Tracing Endpoint	`ETHEREUM_JSONRPC_TRACE_URL`	http://localhost:8545	The Tracing endpoint is used to fetch `internal transactions` and `block traces`. In most cases this endpoint is identical to the HTTP Endpoint.
WebSockets Endpoint	`ETHEREUM_JSONRPC_WS_URL`	ws://localhost:8546	The WebSockets endpoint subscribes to `newHeads` which alerts the indexer to fetch the new block from the subscription.