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Questions tagged [replicaset]

This tag is used mostly for a MongoDB replica set (a group of "mongod" processes that maintain the same data set) and rarely for a Kubernetes ReplicaSet (the next-generation Replication Controller with set-based selector support).

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Why was ReplicaSet introduced in Kubernetes?

I understand the difference between ReplicaSet and ReplicationController, of former being Set based and the latter Equality based. What I want to know is why was a newer implementation (Read ReplicaSet) introduced when the older…
Vinodh Nagarajaiah
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Sharded mongodb cluster use only one shard

I'm trying to create a sharded mongodb cluster, I have 3 VM to use and I was trying to get the following setup: VM1) Node.js Application + mongos instance VM2) CSRS PRIMARY + Shard VM3) CSRS SECONDARY + Shard I'm not interested in replication but…
daniele piscaglia
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MongoDb replication lag increasing and drop collection command

We are experiencing a strange behaviour in a production environment related to mongodb replica set and replication lag. Basically we have an installation with a mongodb replica set and an application which writes to the primary node of the replica…
Enrico Massone
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Should I use hostname or IP address for mongodb connection string

I've set up a MongoDB replica set with 3 nodes. All servers live in the same VPC, but in different availability zones. Thanks to etc/hosts file, in while I describe where to find the other nodes, my replica set is able to communicate between nodes.…
Laurent Rivard
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MongoEngine specify read preference on query

I am using Mongo 2.6, Pymongo 2.7.2 and Mongoengine 0.8.7. For a particular read query, I want to use the secondary of my replica set. Hence, as specified in the mongoengine documentation here I wrote my query as follows : from…
Yahya
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mongodb shard replication member: could not find member to sync from

I am trying to set up mongodb that have shards with replica set and I enabled --rest so I can view my shards on my browser however, when I view "replSetGetStatus" it shows "could not find member to sync from" image of my replica members on my…
Ronald-SD
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How to start a replica set without using localhost?

I'm trying to initialize a replica set with 3 nodes. While executing rs.initiate() I got the following error: "No host described in new configuration 1 for replica set ##### maps to this node" If I try to set the first member to "localhost:27017"…
Josh Elias
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How can I create a MongoDB cluster using multiple/three nodes/servers/machines using a single shell script?

How Can I up the 3 config server from a single remote/local terminal ? How Can I up the shard servers ? How can add multiple machines to the shard cluster ? How to create the replica sets in the multi node cluster?
Vikas Kukreti
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Why does my MongoDB database URI listed on Heroku have a replica set option, while the one listed on MongoLab does not?

I setup a MongoDB database on MongoLab through Heroku. I selected the free, single-node, sandbox plan, not any of the replica set clusters. The page for my database on MongoLab shows the following URI to connect to the database:…
Jackmc1047
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mongodb sharding user authentication

I've set up a brand new, sharded MongoDb (3 config servers, 3 node replica set). Followed the documentation online, really didn't have any problems. Sharded a database and a collection; mongos connects to the system; it's all working fine. The one…
rycel
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How can I tell what readPreference MongoDB queries hitting my database are using?

I have a MongoDB 2.4 replica set and have a node.js application that is coded to use readPreference: 'secondaryPreferred' in most--but not all--situations. I'd like to verify on the server that the read preferences are as intended for various…
Aaron Silverman
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How does mongo replica set elections behave when some nodes are dead?

Let’s say I have 5 nodes replica set. 3 of them are dead, 2 alive. How would the majority will be calculated? 5 nodes majority would be 5/2+1=3 but if 3 nodes are dead, will it still look for 3 votes? There are only 2 alive so only 2 votes… or the…
Noam Guy
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Would like to downscale deployment replicas to 1

Currently, the deployment replicas are set as 2. I'm trying to scale down deployments to 1 using the below command kubectl scale deploy -n myspace --replicas=1 --all it terminates but spins back to 2. How can I scale down?
Sumitha Nirmal
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MongoDB single node replicaset never finishing instanciating Error: "Cannot use non-local read concern until replica set is finished initializing"

I'm trying to setup a mongodb replicaset as a single node in a docker container because I need to use the transactions to watch over changes in collections. The issue I'm having is that the replicaset seems to never finish to instanciate and the…
Junn Sorran
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MongoDB ReplicaSet in K8S -- can't connect via port forward

I have a k8s dev cluster (in aks). I previously used the bitnami chart for deployment of a single MongoDB pod and I never had the following problem. As I'm now using a feature that only works with replicaSets, I recently moved to using the…
Software Engineer
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