Why can’t the custom domain on Heroku be resolved

heroku

I configured a custom domain for a small site on Heroku on Friday. It worked then, but now, it's broken. The host is nedgros.de. nedgros.herokuapp.com has address 23.21.239.236.

Is does not resolve to the right application. How can I configure the DNS to follow the Dyno dynamics?

Best Answer

$ dig  nedgros.de any
...
;; QUESTION SECTION:
;nedgros.de.                    IN      ANY

;; ANSWER SECTION:
nedgros.de.             86301   IN      CNAME   nedgros.herokuapp.com.

Short answer: you cannot have a CNAME at the "top" of the zone, a CNAME is an alias or reference, it cannot coexist with any other data. Specifically, it cannot coexist with a NS and SOA records which are rather important for the correct operation of your domain. RFC 1912 Section 2.4.

You have not properly followed the Heroku instructions. See https://devcenter.heroku.com/articles/custom-domains , if this setup is what you want read the part on "Apex domains".

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Heroku custom domain name

Yes, you would use a CNAME to myapp.herokuapp.com.

Additionally, you have to tell Heroku to accept the custom domain as valid, basically by running something like:

$ heroku domains:add www.mydomain.eu

to your app.

Documentation can be found here: Heroku Custom Domains

Heroku Error R14 (Memory quota exceeded) using node.js

Here is the response from heroku. Looks like you need to make configuration changes and can't use the out of the box config.

Hi Stan,

Thanks for linking to those docs; I'll need to update that terminal example as I've recently silenced the chatty WEB_CONCURRENCY output. We added logging when we added the feature largely so folks wouldn't be surprised at these new variables invading their environment.

To see the values for your app, you can run:

$ heroku run 'echo $WEB_MEMORY, $WEB_CONCURRENCY' However, let me be clear - these values only exist for determining how many concurrent processes should be run by a clustered node app, and even then only if you choose to use the WEB_CONCURRENCY value in your code. They do not impact, at all, the node binary or its default memory allocations or garbage collection, which are totally standard, vanilla versions downloaded from nodejs.org/dist:

https://devcenter.heroku.com/articles/node-concurrency#tuning-the-concurrency-level V8 uses a greedy and lazy approach to garbage collection. Additionally, V8 assumes by default that you have about 1.5 GB to work with (more than the 1 GB limit of a 2X dyno). You have a few options if you're interested in changing node's default memory behavior:

Manually trigger GC whenever memory exceeds a set limit (https://simonmcmanus.wordpress.com/2013/01/03/forcing-garbage-collection-with-node-js-and-v8/)
Set max_old_space_size to lower than the default (eg, node --max_old_space_size=960). Several metrics in the v8 source are tied to max_old_space_size, so this can make gc somewhat more aggressive. The downside is that if you exceed the value even by a byte, your program will crash.
Set gc_global to true to force always-global collection (false by default - keep in mind that global collection is slower than the default multi-phase collection).
Set nolazy_sweeping to true, which also makes the gc a little more aggressive.

Keep in mind that, if you're exceeding about 1 GB of memory in a single node process, the best practice is to split that process into multiple workers:

https://github.com/joyent/node/wiki/FAQ#what-is-the-memory-limit-on-a-node-process Cheers, Hunter

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Heroku custom domain name

Heroku Error R14 (Memory quota exceeded) using node.js

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