Statefulsets | Deploying MongoDB cluster to Kubernetes 

Why would you run db in kubernetes, when you have managed dbs so cheap

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@@PavanElthepu Hey small doubt hope you could reply to this, how do we connect to the mongo compass from this replicaset, i tried the same method as the deployment, but it didnt work, hoping you could clarify this? Thanks

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Yes, you can use same concept with PostgreSQL

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@@PavanElthepu sure..

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@@PavanElthepu Superb Pavan. thanks for the headsup. i have subscribed your channel. by the way when i execute the comman "k exec -it mongo-0 -- mongo ". I am getting below error. OCI runtime exec failed: exec failed: unable to start container process: exec: "mongo": executable file not found in $PATH: unknown How to resolve this error. Can you please tell me Pavan. GOD BLESS YOU !!!

Hey buddy I have been into devops for quite some time now. This video is a gateway for many who make it hard to understand statefulset.. Way to go..

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@@PavanElthepu Done

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Doesn't matter, anything that you store for future usage makes an application Stateful. Examples: Redis, all DBs, all message brokers, etc..

Updated the description with manifest link Swapnil. Glad that it helped you, kindly share the video with your colleagues and friends.

Thank you Sri Rama Krishna. It’s saying that configmap not found

@@PavanElthepu Thanks Pavan..

Hi Pavan.. Thanks for your time. can we create a mongodb instance with single replicaset .will that serves our purpose for read & write operations...How we need to do the replica setup for single pod..?

Hi Najib, you can give read preference in connection string or in your code while doing database operations.

I depends on your application. If you’re storing any state, the go for statefulset. If there is no state needed, go with deployment

Did you use same manifest?

@@PavanElthepu Thank you for quick reply Pavan. I'm good with image:4.0.8 no issues as you mentioned in your yaml file, where as if I use latest image, can you do post for latest image

@@subbareddyjangalapalli6310 sure, I'll try

Typesense should be deployed using Statefulset as it’s a stateful application.

There are multiple ways of doing this like using Operator, adding a sidecar container, etc..

Have you got the answer, because I too am searching for the same

If the Master Node goes down an election is held between the secondary nodes and new Primary node is elected. Also if the failed primary node recreates and comes back it becomes a secondary node.

Yes, you can use a Deployment instead of a StatefulSet to deploy a single replica of MongoDB. However, there are some important differences between the two that you should consider before making a decision. A StatefulSet is typically used when you need to manage stateful applications that require stable, unique network identities and persistent storage. MongoDB is a stateful application, and using a StatefulSet ensures that each replica has a unique identity and that data is stored persistently. On the other hand, a Deployment is typically used for stateless applications that can be scaled horizontally. MongoDB can also be deployed in a stateless manner, with a single replica running in a container, and a Deployment can be used for this purpose. Using a StatefulSet for a single MongoDB replica provides some benefits, such as: Unique network identity: Each replica will have a unique hostname that can be used to communicate with it, even if the replica is restarted. Persistent storage: Each replica will have its own persistent volume, which ensures that data is retained even if the replica is restarted or moved to a different node. Ordered startup and shutdown: StatefulSets ensure that replicas are started and stopped in a specific order, which can be important for stateful applications. However, if you only need a single MongoDB replica and do not require these benefits, a Deployment can be used instead. It is simpler to set up and manage, and can still be scaled horizontally if needed in the future.

Hi Harsha, you mean you want to connect to statefulset from Mongo compass?

@@PavanElthepu yes

Watch my jobs and cronjobs video. There I gave the connection uri. You may use it from Mongo Compass

Yes. There are multiple ways of doing this like using Operator, adding a sidecar container, etc..

@@PavanElthepu thanks for the prompt response . The video is really very informative

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@@PavanElthepu Follow-up question. The fact that you need to exec specifically into a pod to run some commands and initiate the "replication/synchronization". Does that mean that things need to be redone (exec + scripts) every time when some pods go down and reboots (because the IP will change and all that)? This would defeat this auto-repair property of Kubernetes.

It doesn't, as that script execution is automated on every pod creation