77 lines
2.2 KiB
Go
77 lines
2.2 KiB
Go
package sysinfo
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import (
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"io/ioutil"
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"os"
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"path"
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"strconv"
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"strings"
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"github.com/Sirupsen/logrus"
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"github.com/docker/libcontainer/cgroups"
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)
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// SysInfo stores information about which features a kernel supports.
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type SysInfo struct {
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MemoryLimit bool
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SwapLimit bool
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CpuCfsQuota bool
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IPv4ForwardingDisabled bool
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AppArmor bool
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}
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// New returns a new SysInfo, using the filesystem to detect which features the kernel supports.
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func New(quiet bool) *SysInfo {
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sysInfo := &SysInfo{}
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if cgroupMemoryMountpoint, err := cgroups.FindCgroupMountpoint("memory"); err != nil {
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if !quiet {
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logrus.Warnf("Your kernel does not support cgroup memory limit: %v", err)
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}
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} else {
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// If memory cgroup is mounted, MemoryLimit is always enabled.
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sysInfo.MemoryLimit = true
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_, err1 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.memsw.limit_in_bytes"))
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sysInfo.SwapLimit = err1 == nil
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if !sysInfo.SwapLimit && !quiet {
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logrus.Warn("Your kernel does not support swap memory limit.")
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}
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}
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if cgroupCpuMountpoint, err := cgroups.FindCgroupMountpoint("cpu"); err != nil {
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if !quiet {
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logrus.Warnf("%v", err)
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}
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} else {
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_, err1 := ioutil.ReadFile(path.Join(cgroupCpuMountpoint, "cpu.cfs_quota_us"))
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sysInfo.CpuCfsQuota = err1 == nil
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if !sysInfo.CpuCfsQuota && !quiet {
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logrus.Warn("Your kernel does not support cgroup cfs quotas")
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}
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}
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// Checek if ipv4_forward is disabled.
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if data, err := ioutil.ReadFile("/proc/sys/net/ipv4/ip_forward"); os.IsNotExist(err) {
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sysInfo.IPv4ForwardingDisabled = true
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} else {
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if enabled, _ := strconv.Atoi(strings.TrimSpace(string(data))); enabled == 0 {
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sysInfo.IPv4ForwardingDisabled = true
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} else {
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sysInfo.IPv4ForwardingDisabled = false
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}
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}
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// Check if AppArmor is supported.
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if _, err := os.Stat("/sys/kernel/security/apparmor"); os.IsNotExist(err) {
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sysInfo.AppArmor = false
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} else {
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sysInfo.AppArmor = true
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}
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// Check if Devices cgroup is mounted, it is hard requirement for container security.
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if _, err := cgroups.FindCgroupMountpoint("devices"); err != nil {
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logrus.Fatalf("Error mounting devices cgroup: %v", err)
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}
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return sysInfo
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}
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