how to run datadir in multichain

Question

can anybody give one example command for using datadir to have two nodes in a single machine

Answer 1

This assumes you are in your home directory - if not, type cd ~ before starting.

First create the chain in the default directory  (~/.multichain/) in the normal way:

multichain-util create chaintest

multichaind chaintest -daemon

For this example let's say the node address output was chaintest@12.34.56.78:9255

Now create the second node as follows, using a different datadir, port and rpcport:

mkdir .multichain-other

multichaind -datadir=.multichain-other -port=10255 -rpcport=10254 chaintest@12.34.56.78:9255

You will see the usual message about needing connect permissions, so assign these via the regular node:

multichain-cli chaintest grant [address-shown] connect

Now you can start up the second node again:

multichaind -datadir=.multichain-other -port=10255 -rpcport=10254 chaintest -daemon

You can send commands to the second node as follows:

multichain-cli -datadir=.multichain-other -rpcport=10254 chaintest

To make shorter command lines in future you can add the following lines to the configuration file .multichain-other/chaintest/multichain.conf for the second chain:

port=10255

rpcport=10254

Then in future you can just start up this chain using:

multichaind -datadir=.multichain-other chaintest -daemon

And access its command line using:

multichain-cli -datadir=.multichain-other chaintest

Comments

I'm trying to automate this. Here is a link to what I had to far and the problem that I am facing http://unix.stackexchange.com/questions/332632/capturing-output-from-blocking-process-without-terminating

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Page not found ... error in the link   http://unix.stackexchange.com/questions/332632/capturing-output-from-blocking-process-without-terminating

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They apparently deleted the comment see below


I'm running the following commands in a shell script

ip=$(multichaind decibel -shortoutput=1 -miningrequirespeers=0 -discover -rpcuser=admin -rpcpassword=admin -daemon=1)

mkdir .multichain1

echo "ip address $ip"

addr=$(multichaind $ip -datadir=.multichain1)

echo "wallet $addr"

multichain-cli decibel -rpcuser=admin -rpcpassword=admin grant $addr connect,send,recieve

multichaind $ip -datadir=.multichain1 -daemon=1
The first line is a command

multichaind decibel -shortoutput=1 -miningrequirespeers=0 -discover -rpcuser=admin -rpcpassword=admin -daemon=1

that starts a process/ program and returns a result to the output. I then had to use the output result from this command to run the other command

multichaind *theipaddress* -datadir=.multichain1

Here theipaddress represents result from the first command. I use it to run the above the command which just returns a result to output

multichain-cli decibel -rpcuser=admin -rpcpassword=admin grant *address* connect,send,receive

Here address represents the output from the previous command. it doesn't start any processes/ programs

multichaind *theipaddress* -datadir=.multichain1 -daemon=1

Here theipaddress is the result from the very first command.

Usually these commands have to be run manually and I had to use multiple terminals to do it. I'm trying to now automate the tasks into a shell/ bash script but the problem I am facing is that the first command "blocks" the other processes from being executed.

I can't KILL the first process because it is needed by the 3rd task/ command

Is there a way to auto mate these tasks into one bash script without having to KILL the first command?

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Is it possible to set the datadir of the first node itself?

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Yes you can set the datadir of any node, including the first node, in the same way.

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Having trouble adding the port and rpcport numbers to the .multichain-other/chaintest/multichain.conf. I'm getting a permission error. Is there anyway to do this from the command line?

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Yes, you can run MultiChain with parameters -port=X -rpcport=Y – see this page for more information on runtime parameters: https://www.multichain.com/developers/runtime-parameters/

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That's what I've been doing so far. My question was referring to adding the -port and -rcpport numbers in the .multichain-other/chaintest/multichain.conf file. I'm unable to add/change anything in the file because I do not have permissions to edit it. I wanted to know if there was another way to add the port and rpcport numbers to the file so I can reduce the length of the command line when starting up a node.

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I have setup similar to this.
But if i login to the cli of node 2 and try to check the address,
I still see only the addresses of the 1st node.

Also even when i try to publish to a stream in the 1nd node cli still i see the strem publisher as Node 1 address.

Please let me know if anyone has come across the same issue and found some way.!!

Happy Multichaining :)

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When I try this, I never get the usual message about needing connect permissions on the second node. Running multichain-cli -datadir=.multichain-other -rpcport=10254 chaintest1 gives me a "no credentials" error and recommends I add them to .multichain-other/chaintest1/multichain.conf, which does contain some credentials (but not the same as .multichain/chaintest1/multichain.conf.

MultiChain 2.0 beta 1 on Ubuntu 18.10.

Update: And the reason would be: anyone-can-connect = true

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Dockerfile:
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FROM ubuntu:18.04

WORKDIR /root
RUN apt-get update
RUN apt-get install -y wget
RUN wget https://www.multichain.com/download/multichain-2.1.2.tar.gz
RUN tar -xvzf multichain-2.1.2.tar.gz
WORKDIR /root/multichain-2.1.2
RUN mv multichaind multichain-cli multichain-util /usr/local/bin
WORKDIR /root

RUN multichain-util create chaintest

COPY start.sh .
RUN chmod +x start.sh

ENTRYPOINT ["/root/start.sh"]
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start.sh:
---------------------------------------------------------------
#!/bin/bash

multichaind chaintest -daemon > node1_output.txt

node1_address=$(grep multichaind node1_output.txt | sed 's/multichaind //')

mkdir .multichain-other

multichaind -datadir=.multichain-other -port=10255 -rpcport=10254 $node1_address > node2_output.txt

grep multichain-cli node2_output.txt | grep connect,send,receive > connect_node2.sh

chmod +x connect_node2.sh

./connect_node2.sh > connect_node2.sh_output.txt

echo multichain-cli chaintest > node1_cli.sh
echo multichain-cli -datadir=.multichain-other -rpcport=10254 chaintest > node2_cli.sh
chmod +x node1_cli.sh node2_cli.sh

rm connect_node2.sh multichain-2.1.2.tar.gz node1_output.txt node2_output.txt start.sh

multichaind -datadir=.multichain-other -port=10255 -rpcport=10254 chaintest
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How to use:
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$ docker build -t my-image .
$ docker run --rm -it my-image
$ docker exec -it two /bin/bash
$ ./node2_cli.sh
$ getinfo