Hello,

Not through the public network as our public proxy does not expose the ability to access a single specific replica.

But you can over the private network, when you do a DNS lookup for the private domain of a service with multiple replicas we will return a list of IPs for each replica, example -

https://utilities.up.railway.app/dns-lookup?value=hello-world.railway.internal&type=ip

Then you would just need to write some code to call each IP's status endpoint.

Hope this helps!

Brody

Hello!

So, I should retrieve the IPs using the dns-lookup utilities and then get the values from each IP, correct?

I have a question regarding this.

Can I access private IPs from within the same deployment or the same project?

Thank you!

Hello!

All you need to do is write some code to do a DNS lookup for your desired service's private domain, then loop through each returned IP to make the needed http request.

You can access the IPs of a private service from any service within the same project, but it wouldn't make much sense for a service to do an HTTP health check on itself.

Best,
Brody

OK, then I need to make a simple service to check the instances of the main service in the same project.

Thank you.

No problem!

Hello @brody,

I tried the solution you suggested, but unfortunately, it didn’t work. The target service host is myhost.railway.internal, and I tested it from the myhost2 (which is in the same project) using the following URL:

https://utilities.up.railway.app/dns-lookup?value=myhost.railway.internal&type=ip

However, the result I received was:

lookup myhost.railway.internal on [fd12::10]:53: no such host

Am I missing something?

Are you making sure to do a AAAA DNS lookup? the private network is IPv6 only, thus you need to a AAAA lookup.

What you mean AAAA DNS lookup? The value ‘myhost.railway.internal’ is from railway settings.

Please see Cloudflare's explanation on what a AAAA DNS record is -

https://www.cloudflare.com/learning/dns/dns-records/dns-aaaa-record/

I mean, I use the domain from railway setting(screenshot attached). Couldn’t use this? What can I use a domain for finding internal IPs?

That is the correct domain, are you making sure to do a AAAA DNS lookup? the private network is IPv6 only, thus you need to a AAAA lookup for that domain.

Oh no, you're trying to use utilities.up.railway.app -- thats not going to work, you need to write your own code.

I use utilities.up.railway.app from your advice.

https://utilities.up.railway.app/dns-lookup?value=hello-world.railway.internal&type=ip

I find the internal domain in there so I use it.. but couldn’t I use that?

Oh, OK Thank you

My utilities app does not have access to your private network, it would not be a very private network if it did haha.

I thought it works in the private network because the example has the private domain and when I tried the example, it worked.

Could you make this post private? I haven’t noticed it’s public so I posted some my private informations. I’m sorry.

This thread contains great information for people who may have similar questions, and I'm not noticing anything sensitive here, so I will keep it public.

Either way, you mentioned it works, do you have any more questions?

my service informations in here, So could you please delete the pictures? I’m gonna modifying my informations.

Your service information is not particularly sensitive information, the private domain is something only you can use.

Yes I know but I don’t want to expose the names. Because the people may infer some kind of private informations.

Going to leave this public, nothing sensitive has been shared here!

Private threads are for private matters such as billing issues or reserved for Pro users.