mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
79 lines
2.4 KiB
Go
79 lines
2.4 KiB
Go
package sysinfo
|
|
|
|
import (
|
|
"io/ioutil"
|
|
"os"
|
|
"path"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/Sirupsen/logrus"
|
|
"github.com/docker/libcontainer/cgroups"
|
|
)
|
|
|
|
// New returns a new SysInfo, using the filesystem to detect which features the kernel supports.
|
|
func New(quiet bool) *SysInfo {
|
|
sysInfo := &SysInfo{}
|
|
if cgroupMemoryMountpoint, err := cgroups.FindCgroupMountpoint("memory"); err != nil {
|
|
if !quiet {
|
|
logrus.Warnf("Your kernel does not support cgroup memory limit: %v", err)
|
|
}
|
|
} else {
|
|
// If memory cgroup is mounted, MemoryLimit is always enabled.
|
|
sysInfo.MemoryLimit = true
|
|
|
|
_, err1 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.memsw.limit_in_bytes"))
|
|
sysInfo.SwapLimit = err1 == nil
|
|
if !sysInfo.SwapLimit && !quiet {
|
|
logrus.Warn("Your kernel does not support swap memory limit.")
|
|
}
|
|
|
|
_, err = ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.oom_control"))
|
|
sysInfo.OomKillDisable = err == nil
|
|
if !sysInfo.OomKillDisable && !quiet {
|
|
logrus.Warnf("Your kernel does not support oom control.")
|
|
}
|
|
}
|
|
|
|
if cgroupCpuMountpoint, err := cgroups.FindCgroupMountpoint("cpu"); err != nil {
|
|
if !quiet {
|
|
logrus.Warnf("%v", err)
|
|
}
|
|
} else {
|
|
_, err := ioutil.ReadFile(path.Join(cgroupCpuMountpoint, "cpu.cfs_period_us"))
|
|
sysInfo.CpuCfsPeriod = err == nil
|
|
if !sysInfo.CpuCfsPeriod && !quiet {
|
|
logrus.Warn("Your kernel does not support cgroup cfs period")
|
|
}
|
|
_, err = ioutil.ReadFile(path.Join(cgroupCpuMountpoint, "cpu.cfs_quota_us"))
|
|
sysInfo.CpuCfsQuota = err == nil
|
|
if !sysInfo.CpuCfsQuota && !quiet {
|
|
logrus.Warn("Your kernel does not support cgroup cfs quotas")
|
|
}
|
|
}
|
|
|
|
// Checek if ipv4_forward is disabled.
|
|
if data, err := ioutil.ReadFile("/proc/sys/net/ipv4/ip_forward"); os.IsNotExist(err) {
|
|
sysInfo.IPv4ForwardingDisabled = true
|
|
} else {
|
|
if enabled, _ := strconv.Atoi(strings.TrimSpace(string(data))); enabled == 0 {
|
|
sysInfo.IPv4ForwardingDisabled = true
|
|
} else {
|
|
sysInfo.IPv4ForwardingDisabled = false
|
|
}
|
|
}
|
|
|
|
// Check if AppArmor is supported.
|
|
if _, err := os.Stat("/sys/kernel/security/apparmor"); os.IsNotExist(err) {
|
|
sysInfo.AppArmor = false
|
|
} else {
|
|
sysInfo.AppArmor = true
|
|
}
|
|
|
|
// Check if Devices cgroup is mounted, it is hard requirement for container security.
|
|
if _, err := cgroups.FindCgroupMountpoint("devices"); err != nil {
|
|
logrus.Fatalf("Error mounting devices cgroup: %v", err)
|
|
}
|
|
|
|
return sysInfo
|
|
}
|