Need help with estimating possible service cost on Railway | Railway | Page 1

earnest herald Dec 12, 2023, 5:38 PM

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We made a nodejs application that sends out emails to a lot of users (like 300k - 400k) using sendgrid api. While I'm excited to keep using Railway as hosting platform for our projects, I'm very concerned how much Railway would charge us for possible network bandwidth/RAM/CPU usage.

We don't want to end up in situations like Railway charging us $10k (like crazy AWS bills 😄 ).. so if you can help us estimate the possible cost in the scenario like our application. Thanks in advance!

opaque kilnBOT Dec 12, 2023, 5:38 PM

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hallow voidBOT Dec 12, 2023, 5:38 PM

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Project ID: 330924c6-f27a-45c6-a607-8a0bb0d88515

earnest herald Dec 12, 2023, 5:38 PM

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330924c6-f27a-45c6-a607-8a0bb0d88515

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^ this is the service I'm referring to

untold glen Dec 12, 2023, 5:40 PM

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just visit the account usage page https://railway.app/account/usage

earnest herald Dec 12, 2023, 5:41 PM

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untold glen just visit the account usage page <https://railway.app/account/usage>

yeah i usually check that

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but can you let me know how to estimate that for some scale of users?

e.g. let's say we want to do with 1k users first, then how can I check the usage of bandwidth/cpu/memory?

gilded pecan Dec 12, 2023, 5:44 PM

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The estimated usage of your app is adaptive according to the usage you put through it. I would incrementally increase the amount of traffic you put through it, fake or real. Increase that every 2 days so you get an accurate representation.

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Once you have 4 or 5 data points you'll be able to graph a decent estimation

earnest herald Dec 12, 2023, 5:45 PM

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gilded pecan The estimated usage of your app is adaptive according to the usage you put throu...

Ok makes sense, will do so, thanks

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@gilded pecan
I also have another Q; it's about general usage of internal networks between projects.

We have 2 services deployed; one is REST API, and the other is node.js script, api consumer. I believe using internal network IP of REST API would cost less bandwidth, and be faster because using the external host goes through the internet (also DNS requests) etc?

gilded pecan Dec 12, 2023, 5:47 PM

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I don't believe it would be faster, but using the internal IP eliminates network charges entirely

untold glen Dec 12, 2023, 5:47 PM

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(it is faster)

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(dont use ips, use the internal domains)

earnest herald Dec 12, 2023, 5:48 PM

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this one?

gilded pecan Dec 12, 2023, 5:49 PM

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Yep agreed, missed that part of your question. Railway uses dynamic IPs, so you can't connect to an app through its IP. Use the private networking url

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Yes

earnest herald Dec 12, 2023, 5:49 PM

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ok awesome

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is it same for connecting to postgres db?

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and redis?

gilded pecan Dec 12, 2023, 5:49 PM

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Yes

earnest herald Dec 12, 2023, 5:49 PM

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they have private URLs

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ok awesome

gilded pecan Dec 12, 2023, 5:49 PM

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As long as the DB is on Railway, yes

earnest herald Dec 12, 2023, 5:50 PM

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yes we have everything on Railway

untold glen Dec 12, 2023, 5:50 PM

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and in the same project, and is a database v2 service (has a volume)

earnest herald Dec 12, 2023, 8:17 PM

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@untold glen btw I started Postgres db migration like 20 mins ago, and it's still going on. I just realized I should've not started this operation when the dashboard is having issues atm 😅

We have data like size of 15mb, so it shouldn't be taking that long. Would you be able to check what could be wrong?

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cc @gilded pecan

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3f75e955-9331-42d7-9712-eb29caa447e2

this is the uuid of the postgres plugin

untold glen Dec 12, 2023, 8:19 PM

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neither of us work for Railway, so I'll have to tag in @timber anvil

earnest herald Dec 12, 2023, 8:20 PM

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Aha okay. Thanks in advance jr for taking a look

timber anvil Dec 12, 2023, 8:28 PM

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migration just completed successfully

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I just poked it as it was having trouble reading the logs indicating that everything migrated

untold glen Dec 12, 2023, 8:33 PM

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@earnest herald can you confirm your data is all in place on the new database?

earnest herald Dec 13, 2023, 12:37 AM

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untold glen <@581018979536076800> can you confirm your data is all in place on the new datab...

Yeah it worked, thanks jr

untold glen Dec 13, 2023, 12:37 AM

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awsome, be sure to use the private url now!

earnest herald Dec 13, 2023, 12:49 AM

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untold glen awsome, be sure to use the private url now!

Yeah, I actually have a problem with that. 1 out of 3 services is having trouble connecting to the postgres db through internal URL (2 other services are working fine)

untold glen Dec 13, 2023, 12:55 AM

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yeah there do be some issues sometimes, what is the specific error youre getting?

earnest herald Dec 13, 2023, 3:28 AM

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untold glen yeah there do be some issues sometimes, what is the specific error youre getting...

It's typical db connection error

PrismaClientInitializationError: Can't reach database server at `postgres.railway.internal`:`5432`

Please make sure your database server is running at `postgres.railway.internal`:`5432`.

untold glen Dec 13, 2023, 3:29 AM

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and you can access it publically right?

earnest herald Dec 13, 2023, 3:29 AM

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untold glen and you can access it publically right?

yes, using public URL

earnest herald Dec 13, 2023, 3:30 AM

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earnest herald It's typical db connection error ``` PrismaClientInitializationError: Can't rea...

I have 2 other services using this type of internal URL and they just work fine

untold glen Dec 13, 2023, 3:31 AM

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are you using variable references on your railway service? (to referance the private url?)

gilded pecan Dec 13, 2023, 3:44 AM

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Is the service inside the project? The private URL only works between services in the same project

outer carbon Dec 13, 2023, 4:18 AM

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earnest herald It's typical db connection error ``` PrismaClientInitializationError: Can't rea...

Private networks take sometime to initialize on deploy, you can add a simple sleep 10 in the start of your npm script.

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Also, private networking isn't available during build phase

untold glen Dec 13, 2023, 4:19 AM

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woah woah 10 is overkill, 3 is sufficient

outer carbon Dec 13, 2023, 4:20 AM

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untold glen woah woah 10 is overkill, 3 is sufficient

i had a case where 10 seconds was the minimum to start, but yeah try with 3 seconds first

earnest herald Dec 13, 2023, 3:34 PM

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I just found that I have the same issue with connecting to Redis through its private URL.

default: getaddrinfo ENOTFOUND redis.railway.internal +2005ms

Error: getaddrinfo ENOTFOUND redis.railway.internal

untold glen Dec 13, 2023, 3:38 PM

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are you using ioredis?

earnest herald Dec 13, 2023, 3:44 PM

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untold glen are you using ioredis?

yes

untold glen Dec 13, 2023, 3:44 PM

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give this a read https://docs.railway.app/guides/private-networking#known-configuration-requirements-for-ipv6

earnest herald Dec 13, 2023, 3:45 PM

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and also postgres connection (through internal url) is intermittently working.

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db connection worked from 00 - 03:05, then at 04:05 it didn't work

#Need help with estimating possible service cost on Railway