<p>An existing Pod(<code>P</code>) is running 3 containers for API.</p>
<p>To scale Pod <code>P</code> horizonatally,</p>
<p>Is it possible to add one(or n) more container to an existing Pod(running 3 containers)?</p>
<p>or</p>
<p>Is Pod replica set concept supposed to be applied for this scenario(to scale horizontally)?</p>

<p>No, you don't use multi-container Pods for scaling. Pods with multiple containers are for cases where you need multiple daemons running together (on the same hardware) for a single &quot;instance&quot;. That's pretty rare for new users so you almost certainly want 3 replicas of a Pod with one container.</p>
