Kubernetes Database Setup for digital ocean kubernetes cluster
Challenge: Setup a scalable postgres database cluster
Warning: This is probably very insecure by default
Note: This assumes you have installed doctl cli from digitial ocean
Note: All of this assumes that you have a working kubernetes cluster that you can use to experiments with this
Installation:
1.Create Kubernetes cluster in digital ocean
ID Name Region Version Auto Upgrade Status Node Pools
f8cb4655-e949-4b89-8d74-b3208e4a2437 k8s-1-21-5-do-0-nyc3-1640406587689 nyc3 1.21.5-do.0 false running pool-f0aep6r4q
1a.Run make dokskubeconfig to add your cluster to your local kubeconfig
Example Output:
./scripts/doctl-save-kubeconfig
ID Name Region Version Auto Upgrade Status Node Pools
f8cb4655-e949-4b89-8d74-b3208e4a2437 k8s-1-21-5-do-0-nyc3-1640406587689 nyc3 1.21.5-do.0 false running pool-f0aep6r4q
Enter Kubernetes Cluster Id ... f8cb4655-e949-4b89-8d74-b3208e4a2437
Notice: Adding cluster credentials to kubeconfig file found in "/home/denadmin/.kube/config"
Notice: Setting current-context to do-nyc3-k8s-1-21-5-do-0-nyc3-1640406587689
2.Run make kubegresinstall and then wait until pods are in ready state
3.Run make kubegressetupdatabase and then wait until pods are in ready state
Example Output from steps 2-3:
NAME READY STATUS RESTARTS AGE
pod/clu-psql-1-0 1/1 Running 0 6d
pod/clu-psql-2-0 1/1 Running 0 6d
pod/pg-client 1/1 Running 0 6d
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/clu-psql ClusterIP None <none> 5432/TCP 6d
service/clu-psql-replica ClusterIP None <none> 5432/TCP 6d
service/kubernetes ClusterIP 10.245.0.1 <none> 443/TCP 6d
NAME READY AGE
statefulset.apps/clu-psql-1 1/1 6d
statefulset.apps/clu-psql-2 1/1 6d
4.(optional) Run make dbclientinstall to create a pod for connecting to database
5.Once pg-client pod is up Run make dbclientlogin
6.When Finished with pg-client run make dbclientuninstall
Scripts
| Script Name | Description |
|---|---|
| scripts/create-postgres-login | Used by Makefile to create database login |
| scripts/dbclient-create | Creates pod for database maintenance |
| scripts/dbclient-login | Opens psql for running against client pod |
| scripts/dbclient-copy-files | Copy files to pg-client pod for usage in pod |
| scripts/dbclient-create-dir | Creates directory in pod pg-client |
| scripts/dbclient-remove | Deletes client pod |
| scripts/dbserver-install | Installs Database Server (Kubegres) |
| scripts/dbserver-uninstall | Uninstalls Database Server (Kubegres) from cluster |
| scripts/doctl-get-kubeclusters | Get Currently Setup Digital Ocean Kube Clusters |
| scripts/doctl-save-kubeconfig | Save Kubernetes Config from Digital Ocean Kube Cluster |