Скачать или смотреть Kubernetes | Multi Master Setup | etcd Cluster | Failover Test | Practical Lab | Video-36

How Multi Master failover works?
================================

1. How does etcd cluster works?
2. How to calculate etcd Quorum minimum required members for leader election process using Raft consensus algorithm?
3. Why odd number of master nodes are best fit for the cluster?
4. What is split brain issue?

Lab:
Lab with node level failures
Lab with etcd level failure

ETCDCTL_API=3 etcdctl \
--endpoints=https://127.0.0.1:2379 \
--cacert=/etc/kubernetes/pki/etcd/ca.crt \
--cert=/etc/kubernetes/pki/etcd/server.crt \
--key=/etc/kubernetes/pki/etcd/server.key \
endpoint status --write-out=table

ETCDCTL_API=3 etcdctl \
--cacert=/etc/kubernetes/pki/etcd/ca.crt \
--cert=/etc/kubernetes/pki/etcd/server.crt \
--key=/etc/kubernetes/pki/etcd/server.key \
member list

ETCDCTL_API=3 etcdctl endpoint status --write-out=table \
--endpoints=https://master1:2379,https://master2:2379,https://master3:2379,https://master4:2379 \
--cacert=/etc/kubernetes/pki/etcd/ca.crt \
--cert=/etc/kubernetes/pki/etcd/server.crt \
--key=/etc/kubernetes/pki/etcd/server.key

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