Docker image with tools like curl, wget, ping, nslookup, dig, psql, mysql etc.
When using containers you might want to test the connectivity between the containers. Your application containers won't be having tools like curl, ping, psql client etc. So you can start a one-off container using this image and test your application.
For example, to run a one-off container in Kubernetes:
kubectl run --rm utils -it --image arunvelsriram/utils bash
# You will be seeing a bash prompt
$ psql -h hostname -U test -d test
...
...
$ exit
Note: --rm option will delete the deployment and related pod after exiting from the container. Skip --rm to preserve the deployment and related pod so that you can exec in to the pod and test your application any time.
$ docker pull arunvelsriram/utils
$ docker run --rm -it arunvelsriram/utils bash
# inside the container
$ ping google.com
$ ifconfig
...
$ exit