oam/knowledge base/kubernetes/check pods can connect to external dbs.md

Check Pods can connect to external DBs

Table of contents

1. TL;DR
2. Further readings

TL;DR

1. Get a shell on a test container.

   kubectl run --generator='run-pod/v1' --image 'alpine' -it --rm \
     --limits 'cpu=200m,memory=512Mi' --requests 'cpu=200m,memory=512Mi' \
     ${USER}-mysql-test -- sh
   

2. Install the utility applications needed for the tests.

   apk --no-cache add 'mysql-client' 'netcat-openbsd'
   

3. Test basic connectivity to the external service.

   nc -vz -w3 '10.0.2.15' '3306'
   

4. Test application connectivity.

   mysql --host '10.0.2.15' --port '3306' --user 'root'
   

Further readings

• Kubernetes
• kubectl