Https://blockexplorer.nu/ is down

NuBits
#41

I would seriously consider such a proposal. The Blockexplorer is a key tool in the ecosystem, but the blockexplorer downtime is unacceptable imo. I believe this can be fixed with more robust code (preferred) or just some clever monitoring of processes and when they fail just trigger an automatic restart of those. The latter is not elegant, but at least it decreases the downtime if we can’t afford to improve the code.

1 Like
#42

If someone can write a job description, I can try to find someone.

#43

Coinerella would be interested, but projects like this are very time consuming and thus costly.

I would suggest a HTML/JS/CSS frontend with a PHP backend and Couchdb as Database.

Blockexplorer.nu is currently using Node.js.
I tried to install it on one of our servers, but I couldn’t do it.

1 Like
#44

Not a fan of rewriting it due to the cost. We just need someone to look after it in the first place. Just monitoring it and put some auto notifications in place to be alerted when it doesn’t work.

Only when the maintenance costs prove to be very high due to the chosen products to develop this, I would consider a rebuild.

#45

I have presented this opportunity to @TheCrema who is familiar with node.js and bug hunting.

#46

its down again, while bug hunting takes place, can we automate restart of the application every 4 hours for example using simple cron script?

#47 
#!/bin/sh
#This script will check the explorer every 10 minutes using its API.
#If getting no response or the block height doesn't change compared 
#with 10 min ago, the script will restart the explorer. mhps

while true; do 
  block=`curl -s http://blockexplorer.nu/api/statusInfo  | awk 'BEGIN{RS=",\"";FS=":"}{print $1,$2}' | grep heightInt | awk '{print $2}'`;
  d=`date --utc`;
  if [[ $block == "" ]]; then 
     echo $d Explorer not responding;
     restart=1;
  else
     if [[ $block == $lastBlock ]]; then 
        echo $d Blockchain height not changing for 10 min;
        restart=1;
     else
        echo $d Block $block;
        lastBlock=$block;
        restart=0;
     fi;
  fi;
  if [[ $restart == "1" ]]; then 
     echo Restarting explorer;
# add code to restart the explorer
  fi;
  sleep 600;
done

Possible problem: when the network really couldn’t find a new block somehow in 10min the explorer will get restarted. (It’s possible to compare the explorer with alix.)

More possible problem: if this script runs on the same server where the explorer runs, it might happen that the explorer looks fine from the same server but couldn’t be accessed from outside.

2 Likes
BlockExplorer.nu is now open source
#48

@Ben, @JetJet13, blockexplorer.nu is stuck at block 868,528.
Current height is 871,597:

nud getinfo | grep -v ip
{
    "version" : "v2.1.1-RC1-15-gcf6a10f-beta",
    "protocolversion" : 2000000,
    "walletversion" : 1,
    "walletunit" : "S",
    "balance" : 0.0,
    "newmint" : 0.0,
    "stake" : 0.0,
    "parked" : 0.0,
    "blocks" : 871597,
    "moneysupply" : 821484289.10570002,
    "timeoffset" : -1,
    "connections" : 8,
    "proxy" : "",
    "difficulty" : 0.00019672,
    "testnet" : false,
    "keypoololdest" : 1461141499,
    "keypoolsize" : 101,
    "paytxfee" : 1.0,
    "unlocked_until" : 0,
    "errors" : "Info: Minting suspended due to locked NuShares wallet."
}
[Passed] Proposal for creation of macosx builds
#49

Hey @masterOfDisaster, the explorer is back up and caught up. I switched out supervisor for pm2.

Cheers.

3 Likes
#50

Thank you for your support!
I was made aware that your contract ended - so welcome to the army of those who just try to help :wink:

#51

@JetJet13 B&C Blockexplorer is stuck since 4 days. Can you please give it a kick? Thanks.