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Update instructions to ensure K8s services run on second NIC

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By default, K8s services run on the VM's first NIC; this has no connectivity to other VMs and in fact all VMs use the same IP on this NIC. This change adds --node-ip switch to the kubelet service to ensure it starts all services on the specified IP address (which is the second NIC of the VM). Only tested on VirtualBox provider but expected to be necessary regardless of provider.
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Adrian Parks 2018-11-21 12:12:37 +00:00
parent 9e2158f699
commit e489bcb5d2
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1 changed files with 10 additions and 3 deletions
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13
kubernetes/kubeadm-vagrant/README.md
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@ -38,12 +38,19 @@ These instructions assume you've already installed your virtualization provider
8. Copy the final output of the `kubeadm init` command, which includes a token, to the clipboard. You'll need it later.
9. Install a CNI plugin, such as Calico:
9. The three VMs all have two network cards, and we want to ensure that all Kubernetes services run on the second NIC (enp0s8 on Ubuntu 16.04). This is the one connected to the private network 192.168.100.0/24. To ensure this is the case, log into each node (e.g. `vagrant ssh master`). As root, edit the file `/etc/default/kubelet` and add `--node-ip=$ipaddr` to the `KUBELET_EXTRA_ARGS=` line, where `$ipaddr` is the IP address assigned to the second NIC. Then reload the daemons and restart the kubelet service. The following commands will do this (don't forget to run them as root, and also make sure you run them on all three nodes):
eth1="enp0s8"
ipaddr=$(ip a show $eth1 | egrep -o '([0-9]*\.){3}[0-9]*' | head -n1)
sed -i "s/KUBELET_EXTRA_ARGS=/KUBELET_EXTRA_ARGS=--node-ip=$ipaddr/" /etc/default/kubelet
systemctl daemon-reload && systemctl restart kubelet
10. Install a CNI plugin, such as Calico:
kubectl apply -f https://docs.projectcalico.org/v3.0/getting-started/kubernetes/installation/hosted/kubeadm/1.7/calico.yaml
10. Log out and run `vagrant ssh node-01` to log into "node-01". Run the `kubeadm join` command you copied from the output on "master".
11. Log out and run `vagrant ssh node-01` to log into "node-01". Run the `kubeadm join` command you copied from the output on "master".
11. Repeat step 10, but on "node-02".
12. Repeat step 10, but on "node-02".
Enjoy!