111 lines
3.5 KiB
Markdown
111 lines
3.5 KiB
Markdown
## Introduction
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The following guide shows how to setup an IPv6 only cluster at ungleich.
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## Steps
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- Boot Alpine
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- Configure with cdist to get cri-o configured
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## Control plane
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Initialise with all components:
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```
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kubeadm init -service-cidr 2a0a:e5c0:13:aaa::/108 --pod-network-cidr 2a0a:e5c0:13:bbb::/64
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```
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We cannot yet skip kube-proxy, because calico does not support eBPF
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for IPv6. Cilium supports IPv6 eBPF, but on the other hand does not
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support automatic BGP peering. So the following **does not** work:
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```
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kubeadm init --skip-phases=addon/kube-proxy --service-cidr 2a0a:e5c0:13:aaa::/108 --pod-network-cidr 2a0a:e5c0:13:bbb::/64
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```
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## Alpine / kubelet hack
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Due to some misconfiguration on alpine, **DURING** the **kubeadm
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init** we need to modify the **generated**
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/var/lib/kubelet/config.yaml to replace "cgroupDriver: systemd" with
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"cgroupDriver: cgroupfs".
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The same is necessary on the worker nodes, however that can be done
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anytime before you plan to schedule containers on them, after the
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**kubeadm join** request.
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## Worker nodes
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```
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kubeadm join [2a0a:e5c0:13:0:225:b3ff:fe20:38cc]:6443 --token bw3x98.chp31kcgcd4b5fpf --discovery-token-ca-cert-hash sha256:...
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```
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## CNI/networking
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```
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kubectl apply -f calico.yaml
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```
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Warning: needs to be updated:
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```
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serviceaccount/calico-kube-controllers created
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Warning: policy/v1beta1 PodDisruptionBudget is deprecated in v1.21+, unavailable in v1.25+; use policy/v1 PodDisruptionBudget
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poddisruptionbudget.policy/calico-kube-controllers created
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```
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Checking pods:
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```
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[21:53] server47.place7:~/v3-calico# kubectl -n kube-system get pods
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NAME READY STATUS RESTARTS AGE
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calico-kube-controllers-6d8ccdbf46-4xzz9 0/1 Pending 0 60s
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calico-node-5gkp9 0/1 Init:0/3 0 60s
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calico-node-8lct9 0/1 Init:0/3 0 60s
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calico-node-jmjhn 0/1 Init:0/3 0 60s
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calico-node-krnzr 0/1 Init:ErrImagePull 0 60s
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coredns-558bd4d5db-4rvrf 0/1 Pending 0 3m40s
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coredns-558bd4d5db-g9lbx 0/1 Pending 0 3m40s
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etcd-server47 1/1 Running 0 3m56s
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kube-apiserver-server47 1/1 Running 0 3m55s
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kube-controller-manager-server47 1/1 Running 0 3m56s
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kube-scheduler-server47 1/1 Running 0 3m55s
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[21:54] server47.place7:~/v3-calico#
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```
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## Getting calicoctl
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```
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kubectl apply -f https://docs.projectcalico.org/manifests/calicoctl.yaml
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```
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And alias it:
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```
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alias calicoctl="kubectl exec -i -n kube-system calicoctl -- /calicoctl"
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```
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## Configuring BGP routing
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```
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calicoctl create -f - < bgp....yaml
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```
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## Setup a test deployment
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Do *NOT* use https://k8s.io/examples/application/deployment.yaml. It
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contains an outdated nginx container that has no IPv6 listener. You
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will get results such as
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```
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[19:03] server47.place7:~/ungleich-k8s/v3-calico# curl http://[2a0a:e5c0:13:bbb:176b:eaa6:6d47:1c41]
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curl: (7) Failed to connect to 2a0a:e5c0:13:bbb:176b:eaa6:6d47:1c41 port 80: Connection refused
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```
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if you use that deployment. Instead use something on the line of the
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included **nginx-test-deployment.yaml**:
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```
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kubectl apply -f nginx-test-deployment.yaml
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```
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