[Solved] You created an overlay network with:docker network create -d overlay mynetBut when you try to connect a standalone container using docker run --net mynet, it fails. What is the likely cause? | Docker

Docker - Swarm

You created an overlay network with:

docker network create -d overlay mynet

But when you try to connect a standalone container using docker run --net mynet, it fails. What is the likely cause?

AThe overlay network was not created with the --attachable flag

BThe container image is incompatible with overlay networks

CDocker Swarm mode is not initialized

DThe container must be part of a service to use overlay networks

Step-by-Step Solution

Solution:

Step 1: Identify overlay network usage for standalone containers
Standalone containers can only connect to overlay networks if the network was created with --attachable.
Step 2: Evaluate other options
The container image is incompatible with overlay networks is incorrect; container images do not affect network connection. Docker Swarm mode is not initialized is unrelated if network was created. The container must be part of a service to use overlay networks is false because attachable networks allow standalone containers.
Final Answer:
The overlay network was not created with the --attachable flag -> Option A
Quick Check:
Standalone container needs --attachable network [OK]

Quick Trick: Add --attachable to overlay network for standalone containers [OK]

Common Mistakes:

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