etcd

• It's a distributed key-value database
• It is the backing store for all the Kubernetes cluster data
• It stores the desired state
• Maintain information about the worker nodes
• E.g., what containers were deployed at what time
• Stores information regarding the cluster such as
• Nodes, pods, configs, secrets, accounts, roles, binding, others
• Every information got from kubectl comes from etcd
• You must specify the path to certificate files so that etcdctl can authenticate to etcd API Server