Two Ethereum Node (connected to private net) on Single PC: Node data write error .Synchronisation failed

Question

Is it possible to create 2 geth instance on single PC? Both are connected the private blockchain?

When I connect a node to the private blockchain,it must sync with the blockchain by downloading all blocks upto latest one.Is this possible to do this on a 2nd node instance in same PC?

If not, what is the reason behind this?

I am getting the following error while I tried to run two instance.

First Node geth --identity "TestNode1" --rpc --rpcport "8545" --rpccorsdomain "*" --datadir <data-path-1> --port "30303" --rpcapi db,eth,net,web3,personal,miner --networkid 987 console 2>> logfile_1

Second Node geth --identity "TestNode2" --rpcport "8545" --rpcaddr "xxx.xxx.xx.xx" --ipcdisable --rpccorsdomain "*" --datadir <data-path-2> --port "30304" --rpcapi db,eth,net,web3,personal,miner --networkid 987 console 2>> logfile_2

Error: INFO [10-26|09:30:33.099] Block synchronisation started WARN [10-26|09:30:33.107] Node data write error err="state node 255a57…77b997 failed with all peers (1 tries, 1 peers)" WARN [10-26|09:30:33.107] Synchronisation failed, retrying err="state node 255a57…77b997 failed with all peers (1 tries, 1 peers)"

score 0 · Answer 1 · answered Oct 25 '18 at 10:16

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You can do this with separate --datadir and difference --port on the same PC

answered Oct 25 '18 at 10:16

Tony Dang

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I have tried this, but the new node not downloading the blockchain.I have not seen any syncing information in log – Pt.AR Oct 25 '18 at 10:23
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can you provide more detail the cmd you start the two node on your question? – Tony Dang Oct 25 '18 at 10:24
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and by the way, you need to confirm that your node have peer then it can sync data from – Tony Dang Oct 25 '18 at 10:40
Got errors:Node data write error .sync failed retrying – Pt.AR Oct 25 '18 at 11:34
2nd node instance: geth --datadir < path> --rpcaddr 192.xxx.xx.xx --port "30305" --ipcdisable --networkid 987 – Pt.AR Oct 25 '18 at 12:17
do you have any bootnode or enable rpc admin to see your node have any peers or not – Tony Dang Oct 26 '18 at 02:22
and confirm that the write permission on the datadir path – Tony Dang Oct 26 '18 at 02:42
I have checked the peer using the following command - net.peerCount and admin.peers. – Pt.AR Oct 26 '18 at 04:13
what is the output of the two command? – Tony Dang Oct 26 '18 at 04:28
Resolved :On both commands i have added --syncmode "fast". Now it is working , but at the end found few errors like - Synchronisation failed, dropping peer.retrieved hash chain is invalid Header broke chain ancestry Any issue in Hash pointer? – Pt.AR Oct 26 '18 at 04:59

score 0 · Answer 2 · answered Oct 25 '18 at 11:41

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Why don't you start another VM on your pc and download it there? This way you can keep things "cleaner".

answered Oct 25 '18 at 11:41

OWADVL

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Two Ethereum Node (connected to private net) on Single PC: Node data write error .Synchronisation failed

2 Answers2