Docker and wait command
There are various commands in Docker that allow users to interact with containers. One of these commands is docker wait. This command enables you to wait until a container has completed its task (such as finishing its job or crashing) and then receive its exit code. This feature can be very useful for autonomous scripts and CI/CD integrations.
For example, imagine that a container is responsible for performing a specific task and you want to take a particular action after it has finished its work. By using docker wait, you can easily wait for the container to complete its operation and then use its exit code.
The executing wait command can tell you whether the container has successfully completed its task or not. This information can be very influential in making future decisions. For example, if the exit code of a container equals zero, it indicates that the operation was successfully completed.
In conclusion, the docker wait command allows you to manage appropriate workflows for containers based on their performance. By understanding the exit code of each container, you can optimally schedule subsequent actions and increase the automation of your processes.
Code Example
# Create a new container
docker run -d --name my_container nginx
# Wait until the container finishes and get its exit code
exit_code=$(docker wait my_container)
# Print the exit code of the container
echo "Exit code: $exit_code"
Code Explanation
docker run -d --name my_container nginxThis line creates a new container named
my_container from the nginx image and runs it in detached mode.exit_code=$(docker wait my_container)This line will wait until the
my_container has finished its execution and then stores the exit code of the container in the variable exit_code.echo "Exit code: $exit_code"This line prints the exit code of the container to the console.