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add a flag for cpu_hard_limit

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This commit is contained in:
Jainin Shah 2018-02-01 10:09:12 -08:00
parent 3ad5916f72
commit 04c14b3cb2
1 changed files with 18 additions and 0 deletions
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18
client/driver/docker.go
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@ -120,6 +120,11 @@ const (
// https://docs.docker.com/engine/reference/run/#block-io-bandwidth-blkio-constraint
dockerBasicCaps = "CHOWN,DAC_OVERRIDE,FSETID,FOWNER,MKNOD,NET_RAW,SETGID," +
"SETUID,SETFCAP,SETPCAP,NET_BIND_SERVICE,SYS_CHROOT,KILL,AUDIT_WRITE"
// This is cpu.cfs_period_us: the length of a period. The default values is 100 microsecnds represented in nano Seconds, below is the documnentation
// https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt
// https://docs.docker.com/engine/admin/resource_constraints/#cpu
defaultCFSPeriod = 100000
)
type DockerDriver struct {
@ -217,6 +222,7 @@ type DockerDriverConfig struct {
CapAdd []string `mapstructure:"cap_add"` // Flags to pass directly to cap-add
CapDrop []string `mapstructure:"cap_drop"` // Flags to pass directly to cap-drop
ReadonlyRootfs bool `mapstructure:"readonly_rootfs"` // Mount the container’s root filesystem as read only
CPUHardLimit bool `mapstructure:"cpu_hard_limit"` // Flag to pass whether to enforce CPU hard limit.
}
func sliceMergeUlimit(ulimitsRaw map[string]string) ([]docker.ULimit, error) {
@ -674,6 +680,9 @@ func (d *DockerDriver) Validate(config map[string]interface{}) error {
"readonly_rootfs": {
Type: fields.TypeBool,
},
"cpu_hard_limit": {
Type: fields.TypeBool,
},
},
}
@ -1119,6 +1128,12 @@ func (d *DockerDriver) createContainerConfig(ctx *ExecContext, task *structs.Tas
VolumeDriver: driverConfig.VolumeDriver,
}
// Calculate CPU Quota
if driverConfig.CPUHardLimit {
percentTicks := float64(task.Resources.CPU) / shelpers.TotalTicksAvailable()
hostConfig.CPUQuota = int64(percentTicks * defaultCFSPeriod)
}
// Windows does not support MemorySwap/MemorySwappiness #2193
if runtime.GOOS == "windows" {
hostConfig.MemorySwap = 0
@ -1137,6 +1152,9 @@ func (d *DockerDriver) createContainerConfig(ctx *ExecContext, task *structs.Tas
d.logger.Printf("[DEBUG] driver.docker: using %d bytes memory for %s", hostConfig.Memory, task.Name)
d.logger.Printf("[DEBUG] driver.docker: using %d cpu shares for %s", hostConfig.CPUShares, task.Name)
if driverConfig.CPUHardLimit {
d.logger.Printf("[DEBUG] driver.docker: using %d cpu quota (cpu-period: %d) for %s", hostConfig.CPUQuota, defaultCFSPeriod , task.Name)
}
d.logger.Printf("[DEBUG] driver.docker: binding directories %#v for %s", hostConfig.Binds, task.Name)
// set privileged mode