红帽全球峰会This documentation is for a release that is no longer maintained
See documentation for the latest supported version 3 or the latest supported version 4.5.3. 镜像拉取（pull）策略
Pod 中的每个容器均有容器镜像。您创建了镜像并将其推送（push）到 registry 后，即可在 Pod 中引用它。
5.3.1. 镜像拉取（pull）策略概述
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OpenShift Container Platform 在创建容器时，会使用容器的 imagePullPolicy 来决定是否应在启动容器前拉取（pull）镜像。imagePullPolicy 有三个可能的值：
| 值 | 描述 |
|---|---|
|
| 始终拉取（pull）镜像。 |
|
| 仅拉取（pull）节点上不存在的镜像。 |
|
| 永不拉取（pull）镜像。 |
如果没有指定容器的 imagePullPolicy 参数，OpenShift Container Platform 会根据镜像标签来设置。
-
如果标签为
latest，OpenShift Container Platform 会将imagePullPolicy默认设置为Always。 -
否则，OpenShift Container Platform 会将
imagePullPolicy默认设置为IfNotPresent。
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