cluster.adoc

clusters

oneliner to get the clusters

find . -name '*-cluster.yaml' | sed -e 's/\.\/configs\///' -e 's/-cluster\.yaml//' -e 's/-/ /g'

KIND cluster tables

Table 1. Kind Clusters

cluster	configuration	feature	purpose
upgrade	lb + 3 master + 2 worker	kubernetes v1.18.8 cluster, kubeadm v1.19.5	practice upgrading cluster
2nodes	1 master + 1 worker	hostPort 8080 → container: 30080	simple cluster for quick practice
2nodes mgmt	1 master + 1 worker	hostPort 8080 → containerPort : 30553	simple cluster for quick practice. later will merge with 2nodes
flannel	1 master + 2 workers	flannel cni	practice scheduling
cilium	1 master + 2 workers	cilium	practice cilium install and troubleshooting
calico lb	1 master + 2 worker	calico + metallb	practice LoadBalancer and network policy
calico	1 master + 2 workers	calico cni	practice network policy
all api	1 master + 2 workers	enable all apis	practice alpha features
metrics	1 master + 1 worker	metrics server	practice features such as HPA etc metrics related

docker clusters

Docker clusters are located at labs/bootstrap folder. Basically they are based on kindest/nodes and kindest/haproxy images, however they are not ready clusters. These make the practices easy and efficient. Vagrant takes too much time to launch a new env.

There is a new way Kinder to create this kind of cluster instead of docker-compose. Here is the link https://github.com/kubernetes/kubeadm/tree/master/kinder

Table 2. Docker clusters

cluster	configuration	purpose
1node	1 master	create 1 node kubernete cluster
lb	1 lb, 3 masters, 2 workers	Creating Highly Available clusters with kubeadm
etcd-kubelet	3 nodes	etcd 3 nodes cluster, etcd managed by standalone kubelet
ld-etcd	haproxy + 3 masters + 2 workers + 3 etcd nodes	k8s ha cluster with external etcd cluster

etcd clusters

labs/etcd

All the files in the the above directory are docker-compose files.

Table 3. etcd clusters

cluster	configuration	purpose
1node-etcd	1 node ready cluster	simple practice etcdctl commands
3node-etcd	3 nodes, not ready	practice setup clusters, add and remove members, migrate members
docker-compose	3 node, ready cluster	backup and restore, performance, benchmarking, monitering etc