Mongodump: error while loading shared libraries - when running on Heroku

Steven_Manus · December 7, 2023, 12:38pm

I have a nodejs app running on Heroku and have a cron scheduled task to backup nightly my Mongodb Atlas serverless instance.

The command is mongodump --uri mongodb+srv:/[username]:[password]@cluster0.0bugr.mongodb.net/[dbname] --out [dumppath]

It runs fine locally.

But when run on Heroku I am getting the error:

mongodump: error while loading shared libraries: libssl.so.1.1: cannot open shared object file: No such file or directory

Does anyone have an idea of what’s going wrong?

Tim_Fogarty · December 13, 2023, 10:27pm

Hi @Steven_Manus, the error indicates that mongodump is trying to use OpenSSL but the libraries are not available on Heroku. I suspect you’re using an older version of mongodump since the newer versions do not use OpenSSL. Instead they use Go TLS. What version of mongodump are you using? I recommend using the latest version, which is 100.9.4 at time of writing.

Steven_Manus · December 14, 2023, 11:06am

Hi @Tim_Fogarty -

Thanks for the reply. My understanding is that in order to use mongodump on Heroku, I need to add a buildpack. Apparently, the latest Mongodb buildpack for Heroku is siesgstarena/heroku-buildpack-mongo, but when I try to push my app to Heroku after adding this buildpack, I get the following compile error:

The buildpack that does compile installs MongoDB version 4.0.8:

So, I don’t know how to get a newer version of mongodump running on Heroku. Can you propose a solution?

chris · December 14, 2023, 1:48pm

Download from: https://www.mongodb.com/try/download/database-tools

Database tools has been separated from the database for a few versions now.

Tim_Fogarty · December 14, 2023, 3:03pm

Yeah that buildpack is very old. I wouldn’t recommend using it. Chris is right that you should download a newer version. You could use curl to download the tools on heroku. The buildpack shows how you can do this. I think you just need to change the version:

github.com

siesgstarena/heroku-buildpack-mongo/blob/master/bin/compile

#!/usr/bin/env bash

# Configure Environment
set -o errexit    # always exit on error
set -o pipefail   # don't ignore exit codes when piping output
set -o posix      # more strict failures in subshells

# Configure Directories
build_dir=$1
cache_dir=$2
env_dir=$3
bp_dir=$(cd $(dirname $0); cd ..; pwd)
heroku_dir=$build_dir/.heroku
mkdir -p $heroku_dir/mongo
warnings=$(mktemp)

# Install MongoDB 4.0 to use mongo commands
mongo_version="4.1.5"
echo "-----> Downloading and installing MongoDB version ${mongo_version}..."
[[ $STACK = "heroku-22" ]] && os_id="amazon"

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It’s been a while since I’ve used heroku but I think you can deploy docker images now. If that’s an option, it might also be easier to deploy the official MongoDB docker image. That will have up to date tools.

Steven_Manus · December 14, 2023, 6:25pm

@chris and @Tim_Fogarty -

Thanks for the suggestions. Following your suggestions, I forked siesgstarena’s buildpack and modified it to use the current Linux 86-64 database tools. Worked perfectly!

system · December 19, 2023, 6:25pm

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