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Don't cache images when --vmdriver=none #4059

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merged 5 commits into from
Apr 10, 2019
Merged

Don't cache images when --vmdriver=none #4059

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Don't cache images when --vmdriver=none
marcosdiez Apr 5, 2019
9bc73eb
code comments
marcosdiez Apr 5, 2019
3deee63
removed line as requested
marcosdiez Apr 6, 2019
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shorter comment
marcosdiez Apr 10, 2019
8f5fe19
politically correct comment
marcosdiez Apr 10, 2019
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18 changes: 17 additions & 1 deletion cmd/minikube/cmd/start.go
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Original file line number Diff line number Diff line change
Expand Up @@ -135,7 +135,7 @@ func init() {
startCmd.Flags().String(networkPlugin, "", "The name of the network plugin")
startCmd.Flags().Bool(enableDefaultCNI, false, "Enable the default CNI plugin (/etc/cni/net.d/k8s.conf). Used in conjunction with \"--network-plugin=cni\"")
startCmd.Flags().String(featureGates, "", "A set of key=value pairs that describe feature gates for alpha/experimental features.")
startCmd.Flags().Bool(cacheImages, true, "If true, cache docker images for the current bootstrapper and load them into the machine.")
startCmd.Flags().Bool(cacheImages, true, "If true, cache docker images for the current bootstrapper and load them into the machine. Always false with --vm-driver=none.")
startCmd.Flags().Var(&extraOptions, "extra-config",
`A set of key=value pairs that describe configuration that may be passed to different components.
The key should be '.' separated, and the first part before the dot is the component to apply the configuration to.
Expand Down Expand Up @@ -174,6 +174,22 @@ func runStart(cmd *cobra.Command, args []string) {
exit.WithError("Failed to generate config", err)
}

if viper.GetString(vmDriver) == constants.DriverNone {
/*
Caching images means:
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I think we can do with a much smaller comment:

// Optimization: images will be persistently loaded into host Docker, so no need to duplicate work.

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And to be policitally correct it should be "the container runtime", not Docker®

- minikube download the images
- minikube saves them in ~/.minikube/cache
- minikube loads them to the host machine with `docker load -i ~/.minikube/cache/some_images`

This makes complete sense, except that when --vm-driver=none, the host machine is the local machine.
That means once the images is loaded into docker, it stays there even after reboots and `minikube delete`.
That means they are already cached and nothing needs to be done. Not only that, loading the container with
`docker load -i ~/.minikube/cache/some_images` is unecessary and takes time.
As a bonus, we save disk space.
*/
viper.Set(cacheImages, false)
}

var cacheGroup errgroup.Group
beginCacheImages(&cacheGroup, k8sVersion)

Expand Down