How to run 2 nodes simultaneously?

Question

I created a Node 0 and exited before creating Node 1. Then I created Node 1. And using Admin API, I connected Node 1 to Node 0.

Node 1 is up and running. How do I start Node 0 and sync it with Node 1?

Or is it already synced?

Thanks.

Edit: This is how I installed ethereum in Lubuntu 16.04

sudo apt-get install software-properties-common
sudo add-apt-repository -y ppa:ethereum/ehtereum
sudo apt-get update
sudo apt-get install ethereum

Then I ran these commands to create new account

1) geth --datadir ./ account new
2) geth --datadir ./ init customgenesis.json 
3) geth --datadir ./ --networkid 15 --port 30300 console

Now, 3rd command starts a Geth JavaScript console. So I proceed to run 4th command:

4) geth --datadir ./ account new

Upon this, I get this error:

(anonymous): Line 1:8 Unexpected identifier (and 1 more errors)

No problem. I start a new terminal and rerun the 4th command and it runs fine. Now when I run the 5th command,

5) geth --datadir ./ init customgenesis.json

I get the following error:

Fatal: Failed to open database: resource temporarily unavailable

So I go to first terminal where I created Node 0 and typed exit. Then I reran the 5th commands on the second terminal and command worked. Then I proceeded to run the following commands and they both worked fine:

6) geth --datadir ./ --networkid 15 --port 30301 console

7) admin.addPeer(enode://8cc8dcb50102ac095e6c5de080cff7cc2d66ac4be8093551ba31c60bb315500b68d4cbe2593df6b8e6d35ebd09fb5399a246d67349d9128182caf453df3f3493@127.0.0.1:30300)

Now, what does it mean?

1) Node 0 is off since I exited out of it? 2) Only Node 1 is up? If I understand correctly, both are sharing the same network ID but different ports, hence there shouldn't be any problem running both nodes?

Any insight would be appreciated. Thanks.

are you using the same machine? for adding nodes you can use addpeer() in one of your nodes then they will sync automaticaly — Badr Bellaj, Aug 03 '19 at 11:39
Hello. I have edited my question to include more information — Faraz Durrani, Aug 04 '19 at 01:54
related question https://ethereum.stackexchange.com/questions/7006/how-to-run-two-nodes-on-the-same-device — Badr Bellaj, Aug 04 '19 at 11:08

score 1 · Accepted Answer · answered Aug 04 '19 at 11:05

Your problem as i understand it is using two nodes with the same data directory (--datadir) which is impossible !!

to run two nodes you have to use two different directories and different ports.

First initiate a node

geth -verbosity 3 --datadir="./node1" init genesis.json

Then run it

geth -verbosity 3 --datadir="./node1" --networkid 15 --ipcdisable --port 30301 console

Then run the second node in the same way on a different port (30302) and different datadir --datadir="./node2"

How to run 2 nodes simultaneously?

1 Answers1