'vm.max_map_count is too low' in kubernetes mongodb client

This is how I'm running a mongodb client in my kubernetes cluster:

kind: Pod
apiVersion: v1
metadata:
  name: mongodb-client
  namespace: backup
spec:
  containers:
    - name: mongodb-client
      image: mongo:6.0.6
      command: ["tail", "-f", "/dev/null"]
      imagePullPolicy: IfNotPresent

Then I'm trying to log into the db:

mongosh --host "mongodb-0.mongodb-headless.databases.svc.cluster.local:27017,mongodb-1.mongodb-headless.databases.svc.cluster.local:27017,mongodb-2.mongodb-headless.databases.svc.cluster.local:27017" --authenticationDatabase admin -u user

I do get the output:

Connecting to:          mongodb://<credentials>@mongodb-0.mongodb-headless.databases.svc.cluster.local:27017,mongodb-1.mongodb-headless.databases.svc.cluster.local:27017,mongodb-2.mongodb-headless.databases.svc.cluster.local:27017/?authSource=admin&appName=mongosh+1.10.0
Using MongoDB:          6.0.6
Using Mongosh:          1.10.0

For mongosh info see: https://docs.mongodb.com/mongodb-shell/


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  The server generated these startup warnings when booting
  2023-07-11T08:35:10.635+00:00: vm.max_map_count is too low
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Why do I get vm.max_map_count is too low and where do I have to configure the value?