title: How this pod communicates with ALB?
body: <p>I have this setup. An app (app1) is running in a pod attached with two security groups in AWS like below</p>
  <pre><code> SG1 
       ingress - 10.0.0./8 
       egress - 0.0.0.0/0
  
   SG2  no rules (empty)
  </code></pre>
  <p>SG1 is shared among other applications.
  SG2 is solely used by my app (app1)</p>
  <p>My app (app1) needs to communicate with an ALB in another account. So we add an ALB ingress rule to allow SG2.  This works fine. However could someone explain me why I don't need to add egress rule in SG2?</p>
  <p>thank you</p>