Stacks
A stack is a collection of services, usually related to one application or usage. For example, a WordPress stack definition may include a web server container (such as nginx) and a database container (such as MySQL).
![](https://docs.portainer.io/~gitbook/image?url=https%3A%2F%2F1004065720-files.gitbook.io%2F%7E%2Ffiles%2Fv0%2Fb%2Fgitbook-x-prod.appspot.com%2Fo%2Fspaces%252FQ9EPCYBx6l34QfUrfWiJ%252Fuploads%252FBiYAkaq3B66ZsWMF8cZF%252F2.14-stacks-splash.png%3Falt%3Dmedia%26token%3D41937087-6a42-4842-914d-df80922d4285&width=768&dpr=4&quality=100&sign=ecef99c8&sv=1)
The Images up to date column indicates whether the local images in the stack are up to date, with a green circle indicating they are up to date and a red circle indicating that there is a newer version of an image available at the remote registry. A grey circle indicates Portainer was unable to determine whether there is an update available for the images.
For more on how this works, have a look at this FAQ entry.
Image update notifications are currently not supported for private registries and private images in DockerHub. This is due to be fixed in our next version.
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