Move rest of cgroups functions into cgroups pkg
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
This commit is contained in:
Michael Crosby
parent
c4769ec624
commit
ccc915b7b9
3 changed files with 127 additions and 144 deletions
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@ -124,3 +124,125 @@ func parseCgroupFile(subsystem string, r io.Reader) (string, error) {
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func writeFile(dir, file, data string) error {
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return ioutil.WriteFile(filepath.Join(dir, file), []byte(data), 0700)
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}
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func (c *Cgroup) Apply(pid int) error {
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// We have two implementation of cgroups support, one is based on
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// systemd and the dbus api, and one is based on raw cgroup fs operations
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// following the pre-single-writer model docs at:
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// http://www.freedesktop.org/wiki/Software/systemd/PaxControlGroups/
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//
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// we can pick any subsystem to find the root
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cgroupRoot, err := FindCgroupMountpoint("memory")
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if err != nil {
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return err
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}
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cgroupRoot = filepath.Dir(cgroupRoot)
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if _, err := os.Stat(cgroupRoot); err != nil {
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return fmt.Errorf("cgroups fs not found")
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}
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if err := c.setupDevices(cgroupRoot, pid); err != nil {
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return err
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}
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if err := c.setupMemory(cgroupRoot, pid); err != nil {
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return err
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}
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if err := c.setupCpu(cgroupRoot, pid); err != nil {
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return err
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}
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return nil
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}
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func (c *Cgroup) setupDevices(cgroupRoot string, pid int) (err error) {
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if !c.DeviceAccess {
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dir, err := c.Join(cgroupRoot, "devices", pid)
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if err != nil {
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return err
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}
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defer func() {
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if err != nil {
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os.RemoveAll(dir)
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}
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}()
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if err := writeFile(dir, "devices.deny", "a"); err != nil {
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return err
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}
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allow := []string{
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// /dev/null, zero, full
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"c 1:3 rwm",
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"c 1:5 rwm",
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"c 1:7 rwm",
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// consoles
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"c 5:1 rwm",
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"c 5:0 rwm",
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"c 4:0 rwm",
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"c 4:1 rwm",
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// /dev/urandom,/dev/random
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"c 1:9 rwm",
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"c 1:8 rwm",
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// /dev/pts/ - pts namespaces are "coming soon"
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"c 136:* rwm",
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"c 5:2 rwm",
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// tuntap
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"c 10:200 rwm",
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}
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for _, val := range allow {
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if err := writeFile(dir, "devices.allow", val); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func (c *Cgroup) setupMemory(cgroupRoot string, pid int) (err error) {
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if c.Memory != 0 || c.MemorySwap != 0 {
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dir, err := c.Join(cgroupRoot, "memory", pid)
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if err != nil {
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return err
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}
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defer func() {
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if err != nil {
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os.RemoveAll(dir)
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}
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}()
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if c.Memory != 0 {
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if err := writeFile(dir, "memory.limit_in_bytes", strconv.FormatInt(c.Memory, 10)); err != nil {
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return err
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}
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if err := writeFile(dir, "memory.soft_limit_in_bytes", strconv.FormatInt(c.Memory, 10)); err != nil {
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return err
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}
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}
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if c.MemorySwap != 0 {
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if err := writeFile(dir, "memory.memsw.limit_in_bytes", strconv.FormatInt(c.MemorySwap, 10)); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func (c *Cgroup) setupCpu(cgroupRoot string, pid int) (err error) {
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// We always want to join the cpu group, to allow fair cpu scheduling
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// on a container basis
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dir, err := c.Join(cgroupRoot, "cpu", pid)
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if err != nil {
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return err
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}
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if c.CpuShares != 0 {
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if err := writeFile(dir, "cpu.shares", strconv.FormatInt(c.CpuShares, 10)); err != nil {
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return err
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}
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}
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return nil
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}
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@ -1,140 +0,0 @@
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package cgroup
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import (
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"fmt"
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"github.com/dotcloud/docker/pkg/cgroups"
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"github.com/dotcloud/docker/pkg/libcontainer"
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"io/ioutil"
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"os"
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"path/filepath"
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"strconv"
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)
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func ApplyCgroup(container *libcontainer.Container, pid int) (err error) {
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if container.Cgroups == nil {
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return nil
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}
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// We have two implementation of cgroups support, one is based on
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// systemd and the dbus api, and one is based on raw cgroup fs operations
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// following the pre-single-writer model docs at:
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// http://www.freedesktop.org/wiki/Software/systemd/PaxControlGroups/
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//
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// we can pick any subsystem to find the root
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cgroupRoot, err := cgroups.FindCgroupMountpoint("memory")
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if err != nil {
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return err
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}
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cgroupRoot = filepath.Dir(cgroupRoot)
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if _, err := os.Stat(cgroupRoot); err != nil {
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return fmt.Errorf("cgroups fs not found")
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}
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if err := setupDevices(container, cgroupRoot, pid); err != nil {
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return err
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}
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if err := setupMemory(container, cgroupRoot, pid); err != nil {
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return err
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}
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if err := setupCpu(container, cgroupRoot, pid); err != nil {
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return err
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}
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return nil
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}
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func setupDevices(container *libcontainer.Container, cgroupRoot string, pid int) (err error) {
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if !container.Cgroups.DeviceAccess {
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dir, err := container.Cgroups.Join(cgroupRoot, "devices", pid)
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if err != nil {
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return err
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}
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defer func() {
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if err != nil {
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os.RemoveAll(dir)
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}
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}()
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if err := writeFile(dir, "devices.deny", "a"); err != nil {
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return err
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}
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allow := []string{
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// /dev/null, zero, full
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"c 1:3 rwm",
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"c 1:5 rwm",
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"c 1:7 rwm",
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// consoles
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"c 5:1 rwm",
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"c 5:0 rwm",
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"c 4:0 rwm",
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"c 4:1 rwm",
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// /dev/urandom,/dev/random
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"c 1:9 rwm",
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"c 1:8 rwm",
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// /dev/pts/ - pts namespaces are "coming soon"
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"c 136:* rwm",
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"c 5:2 rwm",
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// tuntap
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"c 10:200 rwm",
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}
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for _, val := range allow {
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if err := writeFile(dir, "devices.allow", val); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func setupMemory(container *libcontainer.Container, cgroupRoot string, pid int) (err error) {
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if container.Cgroups.Memory != 0 || container.Cgroups.MemorySwap != 0 {
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dir, err := container.Cgroups.Join(cgroupRoot, "memory", pid)
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if err != nil {
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return err
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}
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defer func() {
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if err != nil {
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os.RemoveAll(dir)
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}
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}()
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if container.Cgroups.Memory != 0 {
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if err := writeFile(dir, "memory.limit_in_bytes", strconv.FormatInt(container.Cgroups.Memory, 10)); err != nil {
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return err
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}
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if err := writeFile(dir, "memory.soft_limit_in_bytes", strconv.FormatInt(container.Cgroups.Memory, 10)); err != nil {
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return err
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}
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}
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if container.Cgroups.MemorySwap != 0 {
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if err := writeFile(dir, "memory.memsw.limit_in_bytes", strconv.FormatInt(container.Cgroups.MemorySwap, 10)); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func setupCpu(container *libcontainer.Container, cgroupRoot string, pid int) (err error) {
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// We always want to join the cpu group, to allow fair cpu scheduling
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// on a container basis
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dir, err := container.Cgroups.Join(cgroupRoot, "cpu", pid)
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if err != nil {
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return err
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}
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if container.Cgroups.CpuShares != 0 {
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if err := writeFile(dir, "cpu.shares", strconv.FormatInt(container.Cgroups.CpuShares, 10)); err != nil {
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return err
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}
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}
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return nil
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}
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func writeFile(dir, file, data string) error {
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return ioutil.WriteFile(filepath.Join(dir, file), []byte(data), 0700)
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}
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@ -5,7 +5,6 @@ package main
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import (
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"fmt"
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"github.com/dotcloud/docker/pkg/libcontainer"
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"github.com/dotcloud/docker/pkg/libcontainer/cgroup"
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"github.com/dotcloud/docker/pkg/libcontainer/network"
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"github.com/dotcloud/docker/pkg/libcontainer/utils"
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"github.com/dotcloud/docker/pkg/system"
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@ -41,9 +40,11 @@ func execCommand(container *libcontainer.Container, args []string) (int, error)
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// Do this before syncing with child so that no children
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// can escape the cgroup
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if err := cgroup.ApplyCgroup(container, command.Process.Pid); err != nil {
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command.Process.Kill()
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return -1, err
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if container.Cgroups != nil {
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if err := container.Cgroups.Apply(command.Process.Pid); err != nil {
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command.Process.Kill()
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return -1, err
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}
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}
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if container.Network != nil {
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