Control Plane Components
ETCD
ETCD is a control-plane component that acts as a key-value store for K8S. The data store is used to store information about and relating to the cluster, such as nodes, pods, configs, secrets, and more.
By default, ETCD listens on port 2379.
High Availability
In HA K8S environments, there are multiple master nodes, meaning multiple ETCD stores. In order for this configuration to work, you have to ensure that each ETCD service is aware of the others by .......
ETCD API
CommandsAPI Authentication
API Version
Commands differ between ETCD API versions. Check the version using etcdctl version, or etcdctl --version.
Commands
List available commands:
etcdctlAPI V2
Manually set a key value:
etcdctl set key1 value1Manually get a key value:
etcdctl get key1API V3
Manually set a key value:
etcdctl put key1 value1Manually get a key value:
etcdctl get key1