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| ## Description | ||
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| This guide instructs users on how to deploy Memgraph HA to Azure AKS. It serves only as a starting point and there are many ways possible to extend | ||
| what is currently here. In this setup each Memgraph database is deployed to separate, `Standard_A2_v2` node. | ||
|
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| ## Installation | ||
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| You will need: | ||
| - [azure-cli](https://learn.microsoft.com/en-us/cli/azure/) | ||
| - [kubectl](https://kubernetes.io/docs/tasks/tools/) | ||
| - [helm](https://helm.sh/docs/intro/install/) | ||
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| We used `azure-cli 2.67.0, kubectl v1.30.0 and helm 3.14.4`. | ||
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| ## Login with Azure-CLI | ||
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| Use `az login` and enter your authentication details. | ||
|
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| ## Create resource group | ||
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| The next step involves creating resource group which will later be attached to Kubernetes cluster. Example: | ||
| ``` | ||
| az group create --name ResourceGroup2 --location northeurope | ||
| ``` | ||
|
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| ## Provision K8 nodes | ||
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| After creating resource group, K8 nodes can be created and attached to the previously created resource group. There are many other options | ||
| you can use but we will cover here the simplest deployment scenario in which will we use 5 'Standard_A2_v2' instances where each instance will | ||
| host its own Memgraph database. | ||
|
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| ``` | ||
| az aks create --resource-group ResourceGroup2 --name memgraph-ha --node-count 5 --node-vm-size Standard_A2_v2 --generate-ssh-keys | ||
| ``` | ||
|
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| ## Configure kubectl | ||
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| To get remote context from Azure AKS into your local kubectl, use: | ||
| ``` | ||
| az aks get-credentials --resource-group ResourceGroup2 --name memgraph-ha | ||
| ``` | ||
|
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| ## Label nodes | ||
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| By running `kubectl get nodes -o=wide`, you should be able to see your nodes. Example: | ||
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| | NAME | STATUS | ROLES | AGE | VERSION | INTERNAL-IP | EXTERNAL-IP | OS-IMAGE | KERNEL-VERSION | CONTAINER-RUNTIME | | ||
| |-----------------------------------|--------|-------|-----|---------|-------------|-------------|--------------------|----------------------|------------------------| | ||
| | aks-nodepool1-65392319-vmss000000 | Ready | <none>| 11m | v1.29.9 | 10.224.0.4 | <none> | Ubuntu 22.04.5 LTS | 5.15.0-1074-azure | containerd://1.7.23-1 | | ||
| | aks-nodepool1-65392319-vmss000001 | Ready | <none>| 12m | v1.29.9 | 10.224.0.8 | <none> | Ubuntu 22.04.5 LTS | 5.15.0-1074-azure | containerd://1.7.23-1 | | ||
| | aks-nodepool1-65392319-vmss000002 | Ready | <none>| 12m | v1.29.9 | 10.224.0.6 | <none> | Ubuntu 22.04.5 LTS | 5.15.0-1074-azure | containerd://1.7.23-1 | | ||
| | aks-nodepool1-65392319-vmss000003 | Ready | <none>| 11m | v1.29.9 | 10.224.0.5 | <none> | Ubuntu 22.04.5 LTS | 5.15.0-1074-azure | containerd://1.7.23-1 | | ||
| | aks-nodepool1-65392319-vmss000004 | Ready | <none>| 11m | v1.29.9 | 10.224.0.7 | <none> | Ubuntu 22.04.5 LTS | 5.15.0-1074-azure | containerd://1.7.23-1 | | ||
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| Most often users will use smaller nodes for 3 coordinators and bigger nodes for data instances. To be able to do that, we will label first | ||
| 3 nodes with `role=coordinator-node` and the last 2 with `role=data-node`. | ||
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| ``` | ||
| kubectl label nodes aks-nodepool1-65392319-vmss000000 role=coordinator-node | ||
| kubectl label nodes aks-nodepool1-65392319-vmss000001 role=coordinator-node | ||
| kubectl label nodes aks-nodepool1-65392319-vmss000002 role=coordinator-node | ||
| kubectl label nodes aks-nodepool1-65392319-vmss000003 role=data-node | ||
| kubectl label nodes aks-nodepool1-65392319-vmss000004 role=data-node | ||
| ``` | ||
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| ## Deploy Memgraph HA | ||
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| After preparing nodes, we can deploy Memgraph HA cluster by using `helm install` command. We will specify affinity options so that node labels | ||
| are used and so that each data and coordinator instance is exposed through LoadBalancer. | ||
|
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| ``` | ||
| helm install mem-ha-test ./charts/memgraph-high-availability --set \ | ||
| memgraph.env.MEMGRAPH_ENTERPRISE_LICENSE=<licence>,\ | ||
| memgraph.env.MEMGRAPH_ORGANIZATION_NAME=Memgraph,memgraph.affinity.nodeSelection=true,\ | ||
| memgraph.externalAccessConfig.dataInstance.serviceType=LoadBalancer,memgraph.externalAccessConfig.coordinator.serviceType=LoadBalancer | ||
| ``` | ||
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| By running `kubectl get svc -o=wide` and `kubectl get pods -o=wide` we can verify that deployment finished successfully. Example: | ||
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| | NAME | TYPE | CLUSTER-IP | EXTERNAL-IP | PORT(S) | AGE | SELECTOR | | ||
| |---------------------------------|--------------|--------------|-----------------|----------------------------------|-----|----------------------------| | ||
| | kubernetes | ClusterIP | 10.0.0.1 | `<none>` | 443/TCP | 21m | `<none>` | | ||
| | memgraph-coordinator-1 | ClusterIP | 10.0.65.178 | `<none>` | 7687/TCP,12000/TCP,10000/TCP | 63s | app=memgraph-coordinator-1 | | ||
| | memgraph-coordinator-1-external | LoadBalancer | 10.0.28.222 | 172.205.93.228 | 7687:30402/TCP | 63s | app=memgraph-coordinator-1 | | ||
| | memgraph-coordinator-2 | ClusterIP | 10.0.129.252 | `<none>` | 7687/TCP,12000/TCP,10000/TCP | 63s | app=memgraph-coordinator-2 | | ||
| | memgraph-coordinator-2-external | LoadBalancer | 10.0.102.4 | 4.209.216.240 | 7687:32569/TCP | 63s | app=memgraph-coordinator-2 | | ||
| | memgraph-coordinator-3 | ClusterIP | 10.0.42.32 | `<none>` | 7687/TCP,12000/TCP,10000/TCP | 63s | app=memgraph-coordinator-3 | | ||
| | memgraph-coordinator-3-external | LoadBalancer | 10.0.208.244 | 68.219.15.104 | 7687:30874/TCP | 63s | app=memgraph-coordinator-3 | | ||
| | memgraph-data-0 | ClusterIP | 10.0.227.204 | `<none>` | 7687/TCP,10000/TCP,20000/TCP | 63s | app=memgraph-data-0 | | ||
| | memgraph-data-0-external | LoadBalancer | 10.0.78.197 | 68.219.11.242 | 7687:31823/TCP | 63s | app=memgraph-data-0 | | ||
| | memgraph-data-1 | ClusterIP | 10.0.251.227 | `<none>` | 7687/TCP,10000/TCP,20000/TCP | 63s | app=memgraph-data-1 | | ||
| | memgraph-data-1-external | LoadBalancer | 10.0.147.131 | 68.219.13.145 | 7687:30733/TCP | 63s | app=memgraph-data-1 | | ||
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| | NAME | READY | STATUS | RESTARTS | AGE | IP | NODE | NOMINATED NODE | READINESS GATES | | ||
| |-----------------------------|-------|---------|----------|-----|------------|------------------------------------|----------------|-----------------| | ||
| | memgraph-coordinator-1-0 | 1/1 | Running | 0 | 80s | 10.244.0.3 | aks-nodepool1-65392319-vmss000001 | `<none>` | `<none>` | | ||
| | memgraph-coordinator-2-0 | 1/1 | Running | 0 | 80s | 10.244.3.3 | aks-nodepool1-65392319-vmss000000 | `<none>` | `<none>` | | ||
| | memgraph-coordinator-3-0 | 1/1 | Running | 0 | 80s | 10.244.1.8 | aks-nodepool1-65392319-vmss000002 | `<none>` | `<none>` | | ||
| | memgraph-data-0-0 | 1/1 | Running | 0 | 80s | 10.244.4.3 | aks-nodepool1-65392319-vmss000004 | `<none>` | `<none>` | | ||
| | memgraph-data-1-0 | 1/1 | Running | 0 | 80s | 10.244.2.2 | aks-nodepool1-65392319-vmss000003 | `<none>` | `<none>` | | ||
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| ## Connect cluster | ||
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| The only remaining step left is to connect instances. For this we will use Memgraph Lab. Open Lab and use Memgraph instance type of connection. | ||
| For the host enter external ip of `memgraph-coordinator-1-external` and port is 7687. Both for adding coordinators and registering instances, | ||
| we only need to change 'bolt\_server' part to use LoadBalancers' external IP. | ||
|
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| ``` | ||
| ADD COORDINATOR 2 WITH CONFIG {"bolt_server": "4.209.216.240:7687", "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": "68.219.15.104:7687", "management_server": "memgraph-coordinator-3.default.svc.cluster.local:10000", "coordinator_server": "memgraph-coordinator-3.default.svc.cluster.local:12000"}; | ||
| REGISTER INSTANCE instance_1 WITH CONFIG {"bolt_server": "68.219.11.242:7687", "management_server": "memgraph-data-0.default.svc.cluster.local:10000", "replication_server": "memgraph-data-0.default.svc.cluster.local:20000"}; | ||
| REGISTER INSTANCE instance_2 WITH CONFIG {"bolt_server": "68.219.13.145:7687", "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; | ||
| ``` | ||
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| The output of `SHOW INSTANCES` should then look similar to: | ||
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| ``` | ||
| | name | bolt_server | coordinator_server | management_server | health | role | last_succ_resp_ms | | ||
| |---------------|---------------------------------------------------------|---------------------------------------------------------|---------------------------------------------------------|--------|----------|-------------------| | ||
| | "coordinator_1" | "memgraph-coordinator-1.default.svc.cluster.local:7687" | "memgraph-coordinator-1.default.svc.cluster.local:12000" | "memgraph-coordinator-1.default.svc.cluster.local:10000" | "up" | "leader" | 0 | | ||
| | "coordinator_2" | "4.209.216.240:7687" | "memgraph-coordinator-2.default.svc.cluster.local:12000" | "memgraph-coordinator-2.default.svc.cluster.local:10000" | "up" | "follower"| 550 | | ||
| | "coordinator_3" | "68.219.15.104:7687" | "memgraph-coordinator-3.default.svc.cluster.local:12000" | "memgraph-coordinator-3.default.svc.cluster.local:10000" | "up" | "follower"| 26 | | ||
| | "instance_1" | "68.219.11.242:7687" | "" | "memgraph-data-0.default.svc.cluster.local:10000" | "up" | "main" | 917 | | ||
| | "instance_2" | "68.219.13.145:7687" | "" | "memgraph-data-1.default.svc.cluster.local:10000" | "up" | "replica" | 266 | | ||
| ``` | ||
|
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| ## Using CommonLoadBalancer | ||
|
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| When using 'CommonLoadBalancer', all three coordinators will be behind a single LoadBalancer. To connect the cluster, open Lab and use Memgraph | ||
| instance type of connection. For the host enter external IP of `memgraph-coordinator-1-external` and port is 7687. Again, we only need to change | ||
| 'bolt\_server' part to use LoadBalancers' external IP. When connecting to CommonLoadBalancer, K8 will automatically route you to one of coordinators. | ||
| To see on which coordinator did you end route, run `show instances`. If for example, the output of show instances says you are connected to | ||
| coordinator 2, we need to add coordinators 1 and 3. Registering data instances stays exactly the same. | ||
|
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| ``` | ||
| ADD COORDINATOR 1 WITH CONFIG {"bolt_server": "<CommonLoadBalancer-IP>:7687", "management_server": "memgraph-coordinator-1.default.svc.cluster.local:10000", "coordinator_server": "memgraph-coordinator-1.default.svc.cluster.local:12000"}; | ||
| ADD COORDINATOR 3 WITH CONFIG {"bolt_server": "CommonLoadBalancer-IP:7687", "management_server": "memgraph-coordinator-3.default.svc.cluster.local:10000", "coordinator_server": "memgraph-coordinator-3.default.svc.cluster.local:12000"}; | ||
| REGISTER INSTANCE instance_1 WITH CONFIG {"bolt_server": "68.219.11.242:7687", "management_server": "memgraph-data-0.default.svc.cluster.local:10000", "replication_server": "memgraph-data-0.default.svc.cluster.local:20000"}; | ||
| REGISTER INSTANCE instance_2 WITH CONFIG {"bolt_server": "68.219.13.145:7687", "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; | ||
| ``` |
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charts/memgraph-high-availability/templates/load-balancer.yaml
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| {{- if $.Values.memgraph.coordLoadBalancer.enabled}} | ||
| apiVersion: v1 | ||
| kind: Service | ||
| metadata: | ||
| name: external-access | ||
| spec: | ||
| type: LoadBalancer | ||
| selector: | ||
| instance-type: coordinator | ||
| ports: | ||
| - protocol: TCP | ||
| name: bolt | ||
| port: {{ $.Values.memgraph.ports.boltPort }} | ||
| targetPort: {{ $.Values.memgraph.ports.boltPort }} | ||
| {{- end }} | ||
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