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sysinfo_linux.go
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sysinfo_linux.go
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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
}