Add ingress-nginx as revery proxy ingress solution

[as51340]

1. Install Memgraph HA

helm install mem-ha-test ./charts/memgraph-high-availability --set memgraph.env.MEMGRAPH_ENTERPRISE_LICENSE=<LICENSE>,memgraph.env.MEMGRAPH_ORGANIZATION_NAME=<ORGANIZATION>,memgraph.affinity.nodeSelection=true,memgraph.externalAccessConfig.dataInstance.serviceType=IngressNginx,memgraph.externalAccessConfig.coordinator.serviceType=IngressNginx

2. Install ingress-nginx

helm upgrade --install ingress-nginx ingress-nginx \
  --repo https://kubernetes.github.io/ingress-nginx \
  --namespace ingress-nginx --create-namespace \
  --set controller.tcp.services.configMapNamespace=ingress-nginx \
  --set controller.tcp.services.configMapName=tcp-services

3. Open ingress-nginx-controller service for editing

KUBE_EDITOR="nvim" kubectl edit svc ingress-nginx-controller -n ingress-nginx # or any other editor

4. In spec.ports section, append following configuration for ports:

- name: data-0
  port: 9000
  targetPort: 9000
  protocol: TCP
- name: data-1
  port: 9001
  targetPort: 9001
  protocol: TCP
- name: coord-1
  port: 9011
  targetPort: 9011
  protocol: TCP
- name: coord-2
  port: 9012
  targetPort: 9012
  protocol: TCP
- name: coord-3
  port: 9013
  targetPort: 9013
  protocol: TCP

Save and close the file

5. Open ingress-nginx-controller deployment for editing

KUBE_EDITOR="nvim" kubectl edit deployment ingress-nginx-controller -n ingress-nginx

6. Locate args section and append the following option:

- --tcp-services-configmap=ingress-nginx/tcp-services

If you get stuck, more info can be found here https://kubernetes.github.io/ingress-nginx/user-guide/exposing-tcp-udp-services/.
Save and close the file.

7. Open Memgraph instance type of connection in Memgraph Lab. For host enter external IP of ingress service. Coordinator 1's port is 9011. Ingress service will be visible
   by runnning:

kubectl get svc -o=wide -A

External IP will be visible there. It's possible that you need to try twice to successfully connect you to coordinator.

8. Add coordinators and register instances

ADD COORDINATOR 2 WITH CONFIG {"bolt_server": "<ingress-LB-external-ip>:9012", "management_server":  "memgraph-coordinator-2.default.svc.cluster.local:10000", "coordinator_server":  "memgraph-coordinator-2.default.svc.cluster.local:12000"};
ADD COORDINATOR 3 WITH CONFIG {"bolt_server": "<ingress-LB-external-ip>:9013", "management_server":  "memgraph-coordinator-3.default.svc.cluster.local:10000", "coordinator_server":  "memgraph-coordinator-3.default.svc.cluster.local:12000"};
REGISTER INSTANCE instance_0 WITH CONFIG {"bolt_server": "<ingress-LB-external-ip>:9000", "management_server": "memgraph-data-0.default.svc.cluster.local:10000", "replication_server": "memgraph-data-0.default.svc.cluster.local:20000"};
REGISTER INSTANCE instance_1 WITH CONFIG {"bolt_server": "<ingress-LB-external-ip>:9001", "management_server": "memgraph-data-1.default.svc.cluster.local:10000", "replication_server": "memgraph-data-1.default.svc.cluster.local:20000"};
SET INSTANCE instance_1 TO MAIN;

9. Uninstallation process

helm uninstall ingress-nginx -n ingress-nginx
helm uninstall mem-ha-test
kubectl delete pvc --all

[antejavor]

Nice work 🚀 🦾

Can you update the config table in README.md with the options for changing the external service type.

[antejavor]

@as51340 if we are going to release now (no further fixes), make sure to bump up the HA chart version.