etcd is a consistent and highly-available key value store used as Kubernetes’ backing store for all cluster data. If your Kubernetes cluster uses etcd as its backing store, make sure you have a back up plan for those data. You can find in-depth information about etcd in the official documentation.
People also ask, can Kubernetes run without etcd?
Kubernetes uses etcd to store all its data – its configuration data, its state, and its metadata. Kubernetes is a distributed system, so it needs a distributed data store like etcd. etcd lets any of the nodes in the Kubernetes cluster read and write data. I’ve also expanded on this article in this Quora answer.
Moreover, is etcd a NoSQL database?
There are more than 225 different NoSQL databases, including the more well known open source projects such as Cassandra, Redis, and Etcd, cloud-based versions such as Amazon Web Services DynamoDB, and proprietary products such as Oracle NoSQL.
What data is stored in etcd?
Etcd is an integral part of the Kubernetes control plane. Etcd stores Kubernetes cluster configuration and state data such as the number of pods, their state, namespace, etc. It also stores Kubernetes API objects and service discovery details.
What is a etcd?
etcd (pronounced et-see-dee) is an open source, distributed, consistent key-value store for shared configuration, service discovery, and scheduler coordination of distributed systems or clusters of machines.
What is DaemonSet in Kubernetes?
A DaemonSet ensures that all eligible nodes run a copy of a Pod. Normally, the node that a Pod runs on is selected by the Kubernetes scheduler. However, DaemonSet pods are created and scheduled by the DaemonSet controller instead.
What is raft in etcd?
Raft library
Raft is a protocol with which a cluster of nodes can maintain a replicated state machine. The state machine is kept in sync through the use of a replicated log.
What kind of database is etcd?
etcd stores data (both key and value) as a binary array; the end user can apply whatever typing they want (often by storing values as JSON). And etcd uses a btree to index the keys, which is the same indexing that most any other DB uses on generic data.
Where is etcd data stored Kubernetes?
Kubernetes’s usage of etcd
By default, Kubernetes objects are stored under the /registry key in etcd. This path can be prefixed by using the kube-apiserver flag –etcd-prefix=”/foo” . etcd is the only place that Kubernetes keeps state.
Why is it called etcd?
The name “etcd” originated from two ideas, the unix “/etc” folder and “d”istributed systems. The “/etc” folder is a place to store configuration data for a single system whereas etcd stores configuration information for large scale distributed systems. Hence, a “d”istributed “/etc” is “etcd”.
Why should I use etcd?
An etcd cluster is meant to provide key-value storage with best of class stability, reliability, scalability and performance. Distributed systems use etcd as a consistent key-value store for configuration management, service discovery, and coordinating distributed work.