Is íomhá Docker ina thimpléad inléite-amháin (feidhmchlár pacáilte le a spleáchais); is coimeádán ina ghealadh rith d'íomhá. An gaol is cosúil le rang agus réad: is féidir le híomhá amháin go leor coimeádáin a bhreith.
Íomhá i gcoinne coimeádáin
IMAGE → a read-only TEMPLATE: the app + dependencies + config, built in layers
(like a blueprint/class; stored, shared, versioned)
CONTAINER → a RUNNING INSTANCE of an image (with a writable layer on top)
(like an object created from a class; has runtime state)
One IMAGE → many CONTAINERS (run the same image multiple times)
