文章目錄
https://kubernetes.io/docs/concepts/containers/images/
https://kubernetes.io/docs/concepts/configuration/overview/#container-images
Container Images
The imagePullPolicy and the tag of the image affect when the kubelet attempts to pull the specified image.
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imagePullPolicy: IfNotPresent: the image is pulled only if it is not already present locally.
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imagePullPolicy: Always: the image is pulled every time the pod is started.
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imagePullPolicy is omitted and either the image tag is :latest or it is omitted: Always is applied.
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imagePullPolicy is omitted and the image tag is present but not :latest: IfNotPresent is applied.
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imagePullPolicy: Never: the image is assumed to exist locally. No attempt is made to pull the image.