Setup
For tests we set up 10 EC2 instances on a private network, we used genesis as bellow:
{
"difficulty": "0x400",
"extraData": "0x00",
"gasLimit": "0x2fefd8",
"nonce": "0x0000000000000042",
"ommersHash": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
"timestamp": "0x00",
"coinbase": "0x0000000000000000000000000000000000000000",
"mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"alloc": {
"d7a681378321f472adffb9fdded2712f677e0ba9": {"balance": "1606938044258990275541962092341162602522202993782792835301376"}
}
}
for mining we used ethminer from https://github.com/Genoil/cpp-ethereum.git from branch 108 which supports CPU mining
we were testing on ubuntu 16.04, to compile ethminer you need to instal some packages:
sudo apt-get -y install software-properties-common
sudo add-apt-repository -y ppa:ethereum/ethereum
sudo apt-get update
sudo apt-get install git cmake libcryptopp-dev libleveldb-dev libjsoncpp-dev libboost-all-dev libgmp-dev libreadline-dev libcurl4-gnutls-dev ocl-icd-libopencl1 opencl-headers mesa-common-dev libmicrohttpd-dev build-essential -y
sudo apt-get install libjsonrpccpp-dev -y
We started ethminer with ethminer -C -F 127.0.0.1:8546 and ours client with sbt -Dconfig.file=/home/ubuntu/node.conf run
Testing
Firstly we run nodes not connected to each other, this way nodes got their own versions of blockchain after chains were ~60 blocks long we connected them together and let them mine and resolve conflicting branches at the same time.
We let them run for 3 days and after checking did not notice any error in logs, nodes are roughly on the same block and they are mining without any issue.
We also checked that we produced blocks with correct ommer.
After that we connected geth classic node and it was able to join network and sync chain from genesis to current block (it was configured for same private network) and it continues ti accepting new blocks after sync was finished
Issue with geth
Also while testing we found out that if geth node is connected only to one node it will not sync if best blocks are too far away in terms of height
eth/fetcher/fetcher.go:631] Peer 010d7622a3242a48: discarded block #16598 [3861d9e4…], distance 3043
what fixed the issue was adding more connections, you can do this with geth console
admin.addPeer("node_address")
etc-client configuration
node.conf file should contains
etc-client {
client-id = "etc-client"
client-version = "etc-client/v0.1"
datadir = "/home/ubuntu/chain_data"
//File format of the keys (in plain text): publicKey ++ CR/LF ++ privateKey
keys-file = ${etc-client.datadir}"nodeId.keys"
keystore-dir = ${etc-client.datadir}"keystore"
// time the system will wait to shutdown the ActorSystem.
shutdown-timeout = "15.seconds"
network {
protocol-version = "1"
server-address {
interface = "public_ip"
port = 9076
}
discovery {
bootstrap-nodes = [
//list of nodes in network
]
bootstrap-nodes-scan-interval = 2 minutes
}
peer {
connect-retry-delay = 20 seconds
connect-max-retries = 30
disconnect-poison-pill-timeout = 5 seconds
wait-for-hello-timeout = 3 seconds
wait-for-status-timeout = 30 seconds
wait-for-chain-check-timeout = 15 seconds
max-blocks-headers-per-message = 200
max-blocks-bodies-per-message = 200
max-receipts-per-message = 200
max-mpt-components-per-message = 400
max-peers = 200
network-id = 1
}
rpc {
enabled = true
interface = "127.0.0.1"
port = 8546
apis = "eth,web3,net"
}
}
mining {
tx-pool-size = 1000
ommers-pool-size = 30
block-cashe-size = 30
coinbase = "aa758c0b47afcafb9751a516e56a7c3332571933"
pooling-services-timeout = 5.seconds
}
blockchain {
frontier-block-number = "0"
homestead-block-number = "1150000"
eip150-block-number = "2500000"
eip160-block-number = "3000000"
difficulty-bomb-pause-block-number = "3000000"
difficulty-bomb-continue-block-number = "5000000"
// Doc: https://blog.ethereum.org/2016/07/20/hard-fork-completed/
dao-fork-block-number = "1920000"
dao-fork-block-total-difficulty = "39490964433395682584"
dao-fork-block-hash = "94365e3a8c0b35089c1d1195081fe7489b528a84b22199c916180db8b28ade7f"
chain-id = "3d"
custom-genesis-file = "/home/ubuntu/custom-genesis.json"
// YP eq 150
block-reward = "5000000000000000000"
}
fast-sync {
do-fast-sync = false
peers-scan-interval = 3.seconds
blacklist-duration = 30.seconds
start-retry-interval = 5.seconds
sync-retry-interval = 5.seconds
peer-response-timeout = 10.seconds
print-status-interval = 2.seconds
persist-state-snapshot-interval = 1.minute
max-concurrent-requests = 50
block-headers-per-request = 2048
block-bodies-per-request = 128
receipts-per-request = 60
nodes-per-request = 1000
min-peers-to-choose-target-block = 2
target-block-offset = 500
check-for-new-block-interval = 1.seconds
block-resolving-depth = 20
}
db {
iodb {
path = ${etc-client.datadir}"iodb/"
}
leveldb {
path = ${etc-client.datadir}"leveldb/"
create-if-missing = true
paranoid-checks = true // raise an error as soon as it detects an internal corruption
verify-checksums = true // force checksum verification of all data that is read from the file system on behalf of a particular read
cache-size = 0
}
}
filter {
filter-timeout = 10.minutes
filter-manager-query-timeout = 3.seconds
pending-transactions-manager-query-timeout = 5.seconds
}
}
akka {
loggers = ["akka.event.slf4j.Slf4jLogger"]
loglevel = "DEBUG"
logging-filter = "akka.event.slf4j.Slf4jLoggingFilter"
logger-startup-timeout = 30s
}
geth classic configuration
chain.json
{
"id": "custom",
"name": "Morden Testnet",
"genesis": {
"nonce": "0x0000000000000042",
"timestamp": "0x00",
"parentHash": "",
"extraData": "0x00",
"gasLimit": "0x2fefd8",
"difficulty": "0x0400",
"mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"coinbase": "0x0000000000000000000000000000000000000000",
"alloc": {
"d7a681378321f472adffb9fdded2712f677e0ba9": {"balance": "1606938044258990275541962092341162602522202993782792835301376"}
}
},
"chainConfig": {
"forks": [
{
"name": "Homestead",
"block": 494000,
"requiredHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"features": [
{
"id": "difficulty",
"options": {
"type": "homestead"
}
},
{
"id": "gastable",
"options": {
"type": "homestead"
}
}
]
},
{
"name": "GasReprice",
"block": 1783000,
"requiredHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"features": [
{
"id": "gastable",
"options": {
"type": "eip150"
}
}
]
},
{
"name": "The DAO Hard Fork",
"block": 1885000,
"requiredHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"features": []
},
{
"name": "Diehard",
"block": 1915000,
"requiredHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"features": [
{
"id": "eip155",
"options": {
"chainID": 62
}
},
{
"id": "gastable",
"options": {
"type": "eip160"
}
},
{
"id": "difficulty",
"options": {
"length": 2000000,
"type": "ecip1010"
}
}
]
}
],
"badHashes": [
]
},
"bootstrap": [
//nodes to connect
]
}