What is kubernetes db update#
What is kubernetes db Patch#

It is a great choice when working towards a manageable and cost-effective digital and data transformation: Kubernetes offers a well-structured solution that is easy to scale, maintain, and invoice with strong business models.

Kubernetes is an orchestration tool that runs containerized workloads in the Cloud.

The Cloud Native PostgreSQL Plugin for kubectl.

What makes Cloud Native PostgreSQL unique.

They do not changed that much but when they do, every application needs to know quickly and polling sucks. That's enough for almost static data.Īnother application might be feature toggles. So quick changes may result in race conditions.Įtcd allows for 1Mb to be stored.

What is kubernetes db update#

Any other application watching the configMap will update their internal state.

What is kubernetes db Patch#

If data get changed by the application just serialize the list and patch the configMap. So it will be very quick to retrieve (like a local cache). ) but your data will be in memory (probably a linked hash map). On change, the application just reads in the list and provides a repository to allow access to the data from your service layer.Īll operations need to be implemented in the repository (search, get, update. So you could just use a k8s configMap to store the array of data (country -> endpoint) and let your backend watch this configMap for changes. Maybe your frontend needs to know the backend endpoints based on the customers country to comply with legal and you know the world wide rollout is done in phases. Let's imagine you have (configuration) data, that is mostly static but may change on runtime. But there are some sort of scenarios, where it can come in handy. There is a nice comparison of NOSQL database consistency by Jepson at įirst, no. M3, a large-scale metrics platform for Prometheus created by Uber, uses etcd for rule storage and other functions But is very different to something like mongodb so it may be better for you if mongodb or similar does not work for you. If you are writing something very different to the kubernetes use case, then you are comparing with all the other no-sql databases. So if you are writing something like the kubernetes use case > it is perfect a well proven store for a distributed application. This is great for feature toggles and other items where everything needs to know and is much better than things like putting a trigger in an sql database and getting it to send an event to an external application or really horrible polling. A nice reliable data store with an easy to use API and a nice way of telling you when things change using raft protocol. Kubernetes is just an example of a critical application that uses it. It has a simple interface using http and json. Leader elections during network partitions and can tolerate machine Provides a reliable way to store data that needs to be accessed by aĭistributed system or cluster of machines. All the nosql key-value stores are built with the goal of fast querying and searching.Įventhough it is obvious that etcd cannot be used as an alternative nosql database, I think the above explanation will prove it cannot be an suitable alternative.Įtcd is a strongly consistent, distributed key-value store that But redis and other key-value stores have data-type flexibility.Įtcd guarantees only high availabilty, but does not give you the fast querying and indexing. It is made to store only kubernetes objects. These are general-purpose distributed memory caching system often used to speed up dynamic database-driven websites by caching data and objects in memory.Įtcd cannot be stored in memory(ram) they can only be persisted in disk storage, whereas redis can be cached in ram and can also be persisted in disk.Įtcd does not have various data types. Redis, memcached and memcacheDB are popular key-value stores. Considering etcd as an key-value store, lets see the available nosql key-value data stores. There are currently more than than 255 nosql databases, which can be broadly classified into Key-Value based, Column based, Document based and Graph based. Nodes in the cluster other than master do not have access to etcd store.

etcd has high access control, that it can be accessed only using API in master node.

etcd is a highly available key-value store which Kubernetes uses for persistent storage of all of its objects like deployment, pod, service information.