CODEWITHSUNDEEP
bashdocker
nsn
nsn

Reputation: 193

How to detect if docker run and the underlying daemon fully started programmatically?

I am running a Virtuoso docker and than loading data on it.

I have all this in a bash script. Since this command run sequentially loading the data usually fails since Virtuoso didn't fully start yet.

The easy solution is just to add a delay (sleep), and it works. It's a bit dirty solution though.

I found this command

docker inspect -f {{.State.Running}} $CONTAINER_ID

But this only tells if the container is running or not.

Is there a way to check if the daemon on docker fully started (in this case Virtuoso) before loading the data?

Upvotes: 1

Views: 320

Answers (2)

BMitch
BMitch

Reputation: 263469

The generic process is to define a healthcheck for your application and then check that health state:

docker inspect --format '{{.State.Health.Status}}' $container_id

The desired output is healthy.

For more details on how to define a healthcheck for your image, see https://docs.docker.com/engine/reference/builder/#healthcheck

The actual command you define for a healthcheck will vary per application being run inside the container.

Upvotes: 1

Gonzalo Matheu
Gonzalo Matheu

Reputation: 10064

You could check if the TCP port is open with wait-for-it script:

container_ip = $(docker inspect --format "{{range .NetworkSettings.Networks}}{{ .IPAddress }}{{end}}") $CONTAINER_ID
until $(./wait-for-it.sh $container_ip:<virtuoso_port> --timeout=1)
do 
 echo "Virtuoso is not responding"; 
done;

Upvotes: 1

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