This is a repo showing an example configuration (for docker compose and helm) to run a HA production mongo setup. The example use mongo 3.6.8 since we have used this release and had no issues with it.
Make sure you have docker and docker-compose installed.
Start with ./reset.sh.
To test everything is working make sure you can connect with:
docker-compose exec mongodb-primary mongo sessionstack -u sessionstack -p test
docker-compose exec mongodb-primary mongo admin -u root -p test
docker-compose exec mongodb-secondary mongo sessionstack -u sessionstack -p test
docker-compose exec mongodb-arbiter mongo
Make sure you have a running kubernetes cluster you can test this on. For local testing you can use minikube (here is a nice guide).
Once you have helm, kubectl and minikube run helm install --name mongodb-main -f ./values.yml stable/mongodb
Check your k8s dashboard (minikube dashboard to start it in minikube) that all the pods for mongo are running.
To test everything is working make sure you can connect with:
kubectl exec -it mongodb-main-primary-0 -- mongo sessionstack -u sessionstack -p test
kubectl exec -it mongodb-main-primary-0 -- mongo admin -u root -p test
kubectl exec -it mongodb-main-secondary-0 -- mongo sessionstack -u sessionstack -p test
kubectl exec -it mongodb-main-arbiter-0 -- mongo
diff <(cat ./values.yml) <(curl -s https://raw.githubusercontent.com/helm/charts/master/stable/mongodb/values.yaml)
1d0
< ---
21c20
< tag: 3.6.8
---
> tag: 4.0.9
48c47
< mongodbRootPassword: test
---
> # mongodbRootPassword:
53,55c52,54
< mongodbUsername: sessionstack
< mongodbPassword: test
< mongodbDatabase: sessionstack
---
> # mongodbUsername: username
> # mongodbPassword: password
> # mongodbDatabase: database
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< enabled: true
---
> enabled: false
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< name: sessionstack-main
---
> name: rs0
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< key: replicasetkeypass
---
> # key: key
- Make sure THP is switched off on the node holding the mongo pods.
- Make sure the persistent disks used for mongo are formatted with XFS