title: How can I determine an appropriate pod CIDR value for a Kubernetes cluster?
body: <p>I'm initiating a kubernetes cluster with:</p>
  
  <pre><code>kubeadm init --pod-network-cidr=192.168.1.0/16 --apiserver-advertise-address=192.168.0.33
  </code></pre>
  
  <p>I'm not too familiar with networking concepts or CIDR, how do I determine an appropriate value for the pod CIDR?</p>
  
  <p>I previously used <code>10.244.0.0/16</code> but that resulted in:</p>
  
  <pre><code>Failed create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "78cf556b2e87e15cc5ec8827ca3a397c16dcfb90f045e225a17028f072db6e5f" network for pod "coredns-78fcdf6894-c7kq2": NetworkPlugin cni failed to set up pod "coredns-78fcdf6894-c7kq2_kube-system" network: failed to set bridge addr: "cni0" already has an IP address different from 10.244.1.1/24
  </code></pre>