title: Does Cloud Composer require a /14 custom subnet?
body: <p>I need my Composer environment to reach some on-prem resources over the VPN tunnel established between GCP and my network. I have my custom VPC network setup and running with a series of /20 subnets. </p>
  
  <p>The problem is I can't spin up a new Composer instance using any of those subnets. The creation job spins for a long, long time with no apparent error, but the K8S cluster creation shows me what's happening:</p>
  
  <p><a href="https://i.stack.imgur.com/0mqN2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0mqN2.png" alt="enter image description here"></a></p>
  
  <p>Apparently it requires a /14 subnet, but I haven't found anything mentioning that in the documenta available.</p>
  
  <p>I just want to make sure this is in fact a requirement before I go ahead and plan to reconfigure all our VPC setup to accommodate such thing.</p>