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Merge pull request #2755 from justincormack/runtime-cgroups

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Add support for creating cgroups in runtime section
This commit is contained in:
Justin Cormack 2017-11-17 17:01:27 +00:00 committed by GitHub
commit cad6527033
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2 changed files with 30 additions and 7 deletions
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2
Makefile
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@ -21,7 +21,7 @@ endif
PREFIX?=/usr/local/
MOBY_REPO=https://github.com/moby/tool.git
MOBY_COMMIT=99480b5dd01b18ff2c80a2ce33ad46a436ccdb25
MOBY_COMMIT=eceb6d11f8685f9da3660683d769659e3688457b
MOBY_VERSION=0.0
bin/moby: tmp_moby_bin.tar | bin
tar xf $<

35
pkg/init/cmd/service/prepare.go
View File

@ -14,15 +14,11 @@ import (
"golang.org/x/sys/unix"
)
const (
wgPath = "/usr/bin/wg"
nsenterPath = "/usr/bin/nsenter-net"
)
// Note these definitions are from moby/tool/src/moby/config.go and should be kept in sync
// Runtime is the type of config processed at runtime, not used to build the OCI spec
type Runtime struct {
Cgroups []string `yaml:"cgroups" json:"cgroups,omitempty"`
Mounts []specs.Mount `yaml:"mounts" json:"mounts,omitempty"`
Mkdir []string `yaml:"mkdir" json:"mkdir,omitempty"`
Interfaces []Interface `yaml:"interfaces" json:"interfaces,omitempty"`
@ -122,7 +118,27 @@ func parseMountOptions(options []string) (int, string) {
return flag, strings.Join(data, ",")
}
// prepareFilesystem sets up the mounts, before the container is created
// newCgroup creates a cgroup (ie directory) under all directories in /sys/fs/cgroup
// we could use github.com/containerd/cgroups but it has a lot of deps and this is just a sugary mkdir
func newCgroup(cgroup string) error {
dirs, err := ioutil.ReadDir("/sys/fs/cgroup")
if err != nil {
return err
}
for _, dir := range dirs {
if !dir.IsDir() {
continue
}
if err := os.MkdirAll(filepath.Join("/sys/fs/cgroup", dir.Name(), cgroup), 0755); err != nil {
log.Printf("cgroup error: %v", err)
}
}
return nil
}
// prepareFilesystem sets up the mounts and cgroups, before the container is created
func prepareFilesystem(path string, runtime Runtime) error {
// execute the runtime config that should be done up front
// we execute Mounts before Mkdir so you can make a directory under a mount
@ -157,6 +173,13 @@ func prepareFilesystem(path string, runtime Runtime) error {
}
}
for _, cgroup := range runtime.Cgroups {
// currently no way to specify resource limits on new cgroups at creation time
if err := newCgroup(cgroup); err != nil {
return fmt.Errorf("Cannot create cgroup %s: %v", cgroup, err)
}
}
return nil
}