How to init mongodb service from dev.nix file?

[Jerast]

I can install the MongoDB service, but I cannot run it. Does anyone know how to do it?"

[alice]

There’s no services.mongodb for the dev.idx file yet… But you still start the mongodb services by your own.

The mongodb package brings a program called mongod which means to be the mongo daemon, if you try to run mongod it will fail because we need to do some tweaks before.

1. Create a directory in your workspace, for instance mongodb
2. Create two files inside that directory, for instance start.sh and mongo.conf with the following content:

mongo.conf file (referenced by mongo page for more info):

processManagement:
   fork: true
net:
   bindIp: localhost
   port: 27017
storage:
   dbPath: "./mongodb/var/lib/mongo"
systemLog:
   destination: file
   path: "./mongodb/var/log/mongodb/mongod.log"
   logAppend: true

start.sh file:

#!/usr/bin/bash

# create inside our directory that we created as `mongodb`
# the following directories which saves the data and log of the mongo service
mkdir -p ./mongodb/var/lib/mongo/
mkdir -p ./mongodb/var/log/mongodb/

# run the mongo daemon with the configuration that we have created above
mongod --config ./mongodb/mongo.conf

3. Start the service everytime that we access to our workspace (in the dev.idx file):

{pkgs, ...}: {
  idx.workspace.onStart = {
    mongo-db = "./mongodb/start.sh";
  };
}

And this should be the final directory tree if we applied the above and run the service:

./my-blank-app/
├── .idx
│   └── dev.nix
├── mongodb
│   ├── mongo.conf
│   ├── start.sh
│   └── var
│       ├── lib
│       │   └── mongo
│       │       ├── collection-0--5619253475827229124.wt
│       │       ├── collection-2--5619253475827229124.wt
│       │       ├── collection-4--5619253475827229124.wt
│       │       ├── diagnostic.data
│       │       │   ├── metrics.2024-08-15T12-11-51Z-00000
│       │       │   └── metrics.interim
│       │       ├── index-1--5619253475827229124.wt
│       │       ├── index-3--5619253475827229124.wt
│       │       ├── index-5--5619253475827229124.wt
│       │       ├── index-6--5619253475827229124.wt
│       │       ├── journal
│       │       │   ├── WiredTigerLog.0000000001
│       │       │   ├── WiredTigerPreplog.0000000001
│       │       │   └── WiredTigerPreplog.0000000002
│       │       ├── _mdb_catalog.wt
│       │       ├── mongod.lock
│       │       ├── sizeStorer.wt
│       │       ├── storage.bson
│       │       ├── WiredTiger
│       │       ├── WiredTigerHS.wt
│       │       ├── WiredTiger.lock
│       │       ├── WiredTiger.turtle
│       │       └── WiredTiger.wt
│       └── log
│           └── mongodb
│               └── mongod.log
└── README.md

[Jerast]

@alice

mongo-db = "./mongodb/start.sh";

Thank you for your suggestion. I tried the solution you provided, but unfortunately, it didn’t solve my problem. Instead, I encountered a new error:

Also, I created a new project and set it up as you explained it, but I get the same error.

[alice]

Oops, sorry I had forgotten to say to add executable permission for the start.sh

chmod +x ./mongodb/start.sh

And it should work normally.

[Jerast]

Thank you very much! It worked.