Problem on virtualize hyperledger network on multiple hosts - postgresql

Question

I have followed and finished the tutorial
https://medium.com/#malliksarvepalli/hyperledger-fabric-1-2-on-multiple-hosts-using-docker-swarm-and-compose-11c13635e69e
and I have 3 hosts connected and all services are up. I had the correct result when I run the ./script.sh in the PC2 host.
Now I am following the next tutorial which is:
https://medium.com/#malliksarvepalli/hyperledger-explorer-with-fabric-1-2-running-on-multiple-hosts-89c5af691b7e
Can anyone please enlighten me in this tutorial? I have figured out that I should create a new host with ubuntu 16.04 and install the following prerequites:
nodejs 8.11.x
PostgreSQL 9.5 or greater
Jq
Am I right?
And in the exploreconfig.json I updated postgres variables:
host:192.168.1.136(4th's vm ip),
port:5432,
username:postgres,
password:psql,
database:fabric
Are they correct?
I have also modified Orderer, Org1 [peer0 & peer1), Org2(peer0 & peer1) IP address in config.json file with the ips of first three Vms where the network is up and running.
And follow the rest instructions and tests but when I run the command ./start.sh I have logs in console which are:
false 'ssl-certs' '/home/database/blockchain-explorer/ssl-certs'
postgres://christy:christy#192.168.1.136:5432/fabric
error when connecting to db: { Error: connect ECONNREFUSED 192.168.1.136:5432
at Object._errnoException (util.js:992:11)
at _exceptionWithHostPort (util.js:1014:20)
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1186:14)
code: 'ECONNREFUSED',
errno: 'ECONNREFUSED',
syscall: 'connect',
address: '192.168.1.136',
port: 5432 }
******* Initialization started for hyperledger fabric platform ******, {
'network-1':
{ version: '1.0',
clients: { 'client-1': [Object] },
channels: { mychannel: [Object] },
organizations: { Org1MSP: [Object], Org2MSP: [Object], OrdererMSP:
[Object] },
peers:
{ 'peer0.org1.ntua.com': [Object],
'peer1.org1.ntua.com': [Object],
'peer0.org2.ntua.com': [Object],
'peer1.org2.ntua.com': [Object] },
orderers: { 'orderer.ntua.com': [Object] } },
'network-2': {} }
client_configs.name undefined client_configs.profile undefined
FabricUtils.createFabricClient
<<<<<<<<<<<<<<<<<<<<<<<<<< Explorer Error >>>>>>>>>>>>>>>>>>>>>
Error : [ 'Invalid platform configuration, Please check the log' ]
error when connecting to db: TypeError: Cannot read property 'on' of
undefined
at Timeout.handleDisconnect [as _onTimeout] (/home/database/blockchain-
explorer/app/persistence/postgreSQL/PgService.js:68:16)
at ontimeout (timers.js:498:11)
at tryOnTimeout (timers.js:323:5)
at Timer.listOnTimeout (timers.js:290:5)
<<<<<<<<<<<<<<<<<<<<<<<<<< Explorer Error >>>>>>>>>>>>>>>>>>>>>
TypeError: "callback" argument must be a function
at setTimeout (timers.js:450:11)
at Timeout.handleDisconnect [as _onTimeout] (/home/database/blockchain-
explorer/app/persistence/postgreSQL/PgService.js:85:5)
at ontimeout (timers.js:498:11)
at tryOnTimeout (timers.js:323:5)
at Timer.listOnTimeout (timers.js:290:5)
Received kill signal, shutting down gracefully
Closed out connections
false 'ssl-certs' '/home/database/blockchain-explorer/ssl-certs'
postgres://christy:christy#192.168.1.136:5432/fabric
error when connecting to db: { Error: connect ECONNREFUSED 192.168.1.136:5432
at Object._errnoException (util.js:992:11)
at _exceptionWithHostPort (util.js:1014:20)
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1186:14)
code: 'ECONNREFUSED',
errno: 'ECONNREFUSED',
syscall: 'connect',
address: '192.168.1.136',
port: 5432 }
******* Initialization started for hyperledger fabric platform ******,
{
'network-1':
{ version: '1.0',
clients: { 'client-1': [Object] },
channels: { mychannel: [Object] },
organizations: { Org1MSP: [Object], Org2MSP: [Object], OrdererMSP:
[Object] },
peers:
{ 'peer0.org1.ntua.com': [Object],
'peer1.org1.ntua.com': [Object],
'peer0.org2.ntua.com': [Object],
'peer1.org2.ntua.com': [Object] },
orderers: { 'orderer.ntua.com': [Object] } },
'network-2': {} }
client_configs.name undefined client_configs.profile undefined
FabricUtils.createFabricClient
<<<<<<<<<<<<<<<<<<<<<<<<<< Explorer Error >>>>>>>>>>>>>>>>>>>>>
Error : [ 'Invalid platform configuration, Please check the log' ]
error when connecting to db: TypeError: Cannot read property 'on' of
undefined
at Timeout.handleDisconnect [as _onTimeout] (/home/database/blockchain-
explorer/app/persistence/postgreSQL/PgService.js:68:16)
at ontimeout (timers.js:498:11)
at tryOnTimeout (timers.js:323:5)
at Timer.listOnTimeout (timers.js:290:5)
<<<<<<<<<<<<<<<<<<<<<<<<<< Explorer Error >>>>>>>>>>>>>>>>>>>>>
TypeError: "callback" argument must be a function
at setTimeout (timers.js:450:11)
at Timeout.handleDisconnect [as _onTimeout] (/home/database/blockchain-
explorer/app/persistence/postgreSQL/PgService.js:85:5)
at ontimeout (timers.js:498:11)
at tryOnTimeout (timers.js:323:5)
at Timer.listOnTimeout (timers.js:290:5)
Received kill signal, shutting down gracefully
Received kill signal, shutting down gracefully
Closed out connections
If the other logs are also needed please let me know. Any help will be helpful. Thanks a lot.

Answer 1

I can give you some aspects to be checked on your environment.
First you need to do check if you are able to access postgresql DB(4th's vm) from the vm where you are trying to launch Hyperledger Explorer. If not, you need to change your postgres configuration (postgresql.conf/pg_hba.conf) for enabling external access, I think.
$ sudo -u postgres psql -h 192.168.1.136 -d fabric -c 'table peer'
Second, please confirm that you did run ./createdb.sh on 4th VM. If you changed database name, you also need to align the script
$ cd app/persistence/fabric/postgreSQL/db/
$ ./createdb.sh