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297 lines
7.5 KiB
Markdown
297 lines
7.5 KiB
Markdown
---
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title: Kubernetes GKE Deployment
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slug: /deployment/kubernetes/gke
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---
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# GKE on Google Cloud Platform Deployment
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OpenMetadata supports the Installation and Running of Application on Google Kubernetes Engine through Helm Charts.
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However, there are some additional configurations which needs to be done as prerequisites for the same.
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{% note %}
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Google Kubernetes Engine (GKE) Auto Pilot Mode is not compatible with one of OpenMetadata Dependencies - ElasticSearch.
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The reason being that ElasticSearch Pods require Elevated permissions to run initContainers for changing configurations which is not allowed by GKE AutoPilot PodSecurityPolicy.
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{% /note %}
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{% note %}
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All the code snippets in this section assume the `default` namespace for kubernetes.
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{% /note %}
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## Prerequisites
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### Persistent Volumes with ReadWriteMany Access Modes
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OpenMetadata helm chart depends on Airflow and Airflow expects a persistent disk that support ReadWriteMany (the volume can be mounted as read-write by many nodes).
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The workaround is to create nfs-server disk on Google Kubernetes Engine and use that as the persistent claim and deploy OpenMetadata by implementing the following steps in order.
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## Create NFS Share
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### Provision GCP Persistent Disk for Google Kubernetes Engine
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Run the below command to create a gcloud compute zonal disk. For more information on Google Cloud Disk Options, please visit [here](https://cloud.google.com/compute/docs/disks).
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```commandline
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gcloud compute disks create --size=100GB --zone=<zone_id> nfs-disk
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```
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### Deploy NFS Server in GKE
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### Code Samples
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```yaml
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# nfs-server-deployment.yml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: nfs-server
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spec:
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replicas: 1
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selector:
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matchLabels:
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role: nfs-server
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template:
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metadata:
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labels:
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role: nfs-server
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spec:
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initContainers:
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- name: init-airflow-directories
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image: busybox
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command: ['sh', '-c', 'mkdir -p /exports/airflow-dags /exports/airflow-logs']
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volumeMounts:
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- mountPath: /exports
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name: nfs-pvc
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containers:
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- name: nfs-server
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image: gcr.io/google_containers/volume-nfs:0.8
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ports:
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- name: nfs
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containerPort: 2049
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- name: mountd
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containerPort: 20048
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- name: rpcbind
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containerPort: 111
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securityContext:
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privileged: true
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volumeMounts:
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- mountPath: /exports
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name: nfs-pvc
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volumes:
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- name: nfs-pvc
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gcePersistentDisk:
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pdName: nfs-disk
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fsType: ext4
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---
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# nfs-cluster-ip-service.yml
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apiVersion: v1
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kind: Service
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metadata:
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name: nfs-server
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spec:
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ports:
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- name: nfs
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port: 2049
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- name: mountd
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port: 20048
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- name: rpcbind
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port: 111
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selector:
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role: nfs-server
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```
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Run the commands below and ensure the pods are running.
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```commandline
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kubectl create -f nfs-server-deployment.yml
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kubectl create -f nfs-cluster-ip-service.yml
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```
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We create a CluserIP Service for pods to access NFS within the cluster at a fixed IP/DNS.
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### Provision NFS backed PV and PVC for Airflow DAGs and Airflow Logs
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Update `<NFS_SERVER_CLUSTER_IP>` with the NFS Service Cluster IP Address for below code snippets.
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You can get the clusterIP using the following command
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```commandline
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kubectl get service nfs-server -o jsonpath='{.spec.clusterIP}'
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```
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### Code Samples for PV and PVC for Airflow DAGs
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```yaml
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# dags_pv_pvc.yml
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apiVersion: v1
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kind: PersistentVolume
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metadata:
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name: openmetadata-dependencies-dags-pv
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spec:
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capacity:
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storage: 10Gi
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accessModes:
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- ReadWriteMany
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nfs:
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server: <NFS_SERVER_CLUSTER_IP>
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path: "/airflow-dags"
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---
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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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labels:
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app: airflow
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release: openmetadata-dependencies
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name: openmetadata-dependencies-dags
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namespace: default
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spec:
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accessModes:
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- ReadWriteMany
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resources:
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requests:
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storage: 10Gi
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storageClassName: ""
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```
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Create Persistent Volumes and Persistent Volume claims with the below command.
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```commandline
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kubectl create -f dags_pv_pvc.yml
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```
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### Code Samples for PV and PVC for Airflow Logs
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```yaml
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# logs_pv_pvc.yml
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apiVersion: v1
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kind: PersistentVolume
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metadata:
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name: openmetadata-dependencies-logs-pv
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spec:
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capacity:
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storage: 10Gi
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accessModes:
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- ReadWriteMany
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nfs:
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server: <NFS_SERVER_CLUSTER_IP>
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path: "/airflow-logs"
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---
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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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labels:
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app: airflow
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name: openmetadata-dependencies-logs
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namespace: default
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spec:
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accessModes:
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- ReadWriteMany
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resources:
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requests:
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storage: 10Gi
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storageClassName: ""
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```
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Create Persistent Volumes and Persistent Volume claims with the below command.
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```commandline
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kubectl create -f logs_pv_pvc.yml
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```
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## Change owner and permission manually on disks
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Since airflow pods run as non root users, they would not have write access on the nfs server volumes. In order to fix the permission here, spin up a pod with persistent volumes attached and run it once.
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```yaml
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# permissions_pod.yml
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apiVersion: v1
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kind: Pod
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metadata:
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creationTimestamp: null
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labels:
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run: my-permission-pod
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name: my-permission-pod
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spec:
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containers:
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- image: nginx
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name: my-permission-pod
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volumeMounts:
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- name: airflow-dags
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mountPath: /airflow-dags
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- name: airflow-logs
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mountPath: /airflow-logs
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volumes:
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- name: airflow-logs
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persistentVolumeClaim:
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claimName: openmetadata-dependencies-logs
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- name: airflow-dags
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persistentVolumeClaim:
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claimName: openmetadata-dependencies-dags
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dnsPolicy: ClusterFirst
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restartPolicy: Always
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```
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{% note %}
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Airflow runs the pods with linux user name as airflow and linux user id as 50000.
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{% /note %}
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Run the below command to create the pod and fix the permissions
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```commandline
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kubectl create -f permissions_pod.yml
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```
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Once the permissions pod is up and running, execute the below commands within the container.
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```commandline
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kubectl exec --tty my-permission-pod --container my-permission-pod -- chown -R 50000 /airflow-dags /airflow-logs
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# If needed
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kubectl exec --tty my-permission-pod --container my-permission-pod -- chmod -R a+rwx /airflow-dags
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```
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## Create OpenMetadata dependencies Values
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Override openmetadata dependencies airflow helm values to bind the nfs persistent volumes for DAGs and logs.
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```yaml
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# values-dependencies.yml
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airflow:
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airflow:
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extraVolumeMounts:
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- mountPath: /airflow-logs
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name: nfs-airflow-logs
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- mountPath: /airflow-dags/dags
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name: nfs-airflow-dags
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extraVolumes:
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- name: nfs-airflow-logs
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persistentVolumeClaim:
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claimName: openmetadata-dependencies-logs
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- name: nfs-airflow-dags
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persistentVolumeClaim:
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claimName: openmetadata-dependencies-dags
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config:
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AIRFLOW__OPENMETADATA_AIRFLOW_APIS__DAG_GENERATED_CONFIGS: "/airflow-dags/dags"
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dags:
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path: /airflow-dags/dags
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persistence:
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enabled: false
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logs:
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path: /airflow-logs
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persistence:
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enabled: false
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```
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For more information on airflow helm chart values, please refer to [airflow-helm](https://artifacthub.io/packages/helm/airflow-helm/airflow/8.5.3).
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Follow [OpenMetadata Kubernetes Deployment](/deployment/kubernetes) to install and deploy helm charts with nfs volumes.
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When deploying openmeteadata dependencies helm chart, use the below command -
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```commandline
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helm install openmetadata-dependencies open-metadata/openmetadata-dependencies --values values-dependencies.yaml
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``` |