Remount /var/lib/docker as --private to fix scaling issue
If an admin mounts all file systems as -rshared (Default on RHEL and Fedora) we see a scaling problem as the number of container increase. Basically every new container needs to have it new mounts in /var/lib/docker shared to all other containers, this ends up with us only able to scale to around 100 containers, before the system slows down. By simply bind mounting /var/lib/docker on its and then setting it private, the scaling issue goes away. Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)
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@ -10,6 +10,7 @@ import (
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"github.com/dotcloud/docker/graph"
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"github.com/dotcloud/docker/image"
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"github.com/dotcloud/docker/pkg/graphdb"
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"github.com/dotcloud/docker/pkg/mount"
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"github.com/dotcloud/docker/pkg/sysinfo"
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"github.com/dotcloud/docker/runconfig"
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"github.com/dotcloud/docker/runtime/execdriver"
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@ -59,6 +60,22 @@ type Runtime struct {
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execDriver execdriver.Driver
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}
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// Mountpoints should be private to the container
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func remountPrivate(mountPoint string) error {
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mounted, err := mount.Mounted(mountPoint)
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if err != nil {
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return err
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}
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if !mounted {
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if err := mount.Mount(mountPoint, mountPoint, "none", "bind,rw"); err != nil {
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return err
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}
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}
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return mount.ForceMount("", mountPoint, "none", "private")
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}
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// List returns an array of all containers registered in the runtime.
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func (runtime *Runtime) List() []*Container {
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containers := new(History)
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@ -654,6 +671,10 @@ func NewRuntimeFromDirectory(config *daemonconfig.Config, eng *engine.Engine) (*
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}
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utils.Debugf("Using graph driver %s", driver)
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if err := remountPrivate(config.Root); err != nil {
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return nil, err
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}
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runtimeRepo := path.Join(config.Root, "containers")
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if err := os.MkdirAll(runtimeRepo, 0700); err != nil && !os.IsExist(err) {
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