A user runs docker network create -d overlay mynet but gets an error: "Error response from daemon: network with name mynet already exists." What should they do?
medium📝 Troubleshoot Q7 of 15
Docker - Swarm
A user runs docker network create -d overlay mynet but gets an error: "Error response from daemon: network with name mynet already exists." What should they do?
AChange the driver to bridge to avoid the conflict.
BUse a different network name or remove the existing network first.
CRestart the Docker daemon to clear the error.
DOverlay networks cannot have duplicate names across different Swarm clusters.
Step-by-Step Solution
Solution:
Step 1: Understand error cause
The error means a network named 'mynet' already exists on the node.
Step 2: Determine resolution
User should pick a new name or delete the existing network before creating a new one with the same name.
Final Answer:
Use a different network name or remove the existing network first. -> Option B
Quick Check:
Network names must be unique per node [OK]
Quick Trick:Network names must be unique; delete or rename to fix [OK]
Common Mistakes:
Restarting daemon unnecessarily
Changing driver without reason
Thinking duplicate names allowed across clusters
Master "Swarm" in Docker
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