failed to acquire lease: subnet "10.244.0.0/16" specified in the flannel net config doesn't contain "192.168.0.0/24"



  • I'm trying to configure Kubernetes with web dashboard. I use these steps:

    swapoff -a
    

    Remove following line from /etc/fstab

    /swap.img       none    swap    sw      0       0
    

    then run these shell commands:

    sudo apt update
    sudo apt install docker.io
    sudo systemctl start docker
    sudo systemctl enable docker 
    sudo apt install apt-transport-https curl
    curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add
    echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" >> ~/kubernetes.list
    sudo mv ~/kubernetes.list /etc/apt/sources.list.d
    sudo apt update
    sudo apt install kubeadm kubelet kubectl kubernetes-cni
    

    sudo kubeadm init --pod-network-cidr=192.168.0.0/16

    mkdir -p $HOME/.kube
    sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    sudo chown $(id -u):$(id -g) $HOME/.kube/config

    I applied this configuration:

    kind: ClusterRoleBinding
    apiVersion: rbac.authorization.k8s.io/v1
    metadata:
      name: flannel-fix
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: ClusterRole
      name: flannel
    subjects:
      - kind: ServiceAccount
        name: flannel
        namespace: kube-flannel
    
    kubectl create -f 
    

    But I get:

    Error registering network: failed to acquire lease: subnet "10.244.0.0/16" specified in the flannel net config doesn't contain "192.168.0.0/24" PodCIDR of the "ubuntukubernetis1" node
    

    Do you know what should be the correct configuration?



  • I figured it out by reading the documentation:

    Take care that your Pod network must not overlap with any of the host networks: you are likely to see problems if there is any overlap.

    Flannel uses 10.244.0.0/16 and can't run on the same as your host... it creates new interfaces when implemented. So when you run this init command it should always be using 10.244.0.0/16.

    sudo kubeadm init --pod-network-cidr=10.244.0.0/16
    

    Once I did this, things started working as expected.


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