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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package root
import (
"bufio"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"testing"
"gvisor.googlesource.com/gvisor/runsc/cgroup"
"gvisor.googlesource.com/gvisor/runsc/test/testutil"
)
func verifyPid(pid int, path string) error {
f, err := os.Open(path)
if err != nil {
return err
}
defer f.Close()
var gots []int
scanner := bufio.NewScanner(f)
for scanner.Scan() {
got, err := strconv.Atoi(scanner.Text())
if err != nil {
return err
}
if got == pid {
return nil
}
gots = append(gots, got)
}
if scanner.Err() != nil {
return scanner.Err()
}
return fmt.Errorf("got: %s, want: %d", gots, pid)
}
// TestCgroup sets cgroup options and checks that cgroup was properly configured.
func TestCgroup(t *testing.T) {
if err := testutil.Pull("alpine"); err != nil {
t.Fatal("docker pull failed:", err)
}
d := testutil.MakeDocker("cgroup-test")
attrs := []struct {
arg string
ctrl string
file string
want string
skipIfNotFound bool
}{
{
arg: "--cpu-shares=1000",
ctrl: "cpu",
file: "cpu.shares",
want: "1000",
},
{
arg: "--cpu-period=2000",
ctrl: "cpu",
file: "cpu.cfs_period_us",
want: "2000",
},
{
arg: "--cpu-quota=3000",
ctrl: "cpu",
file: "cpu.cfs_quota_us",
want: "3000",
},
{
arg: "--cpuset-cpus=0",
ctrl: "cpuset",
file: "cpuset.cpus",
want: "0",
},
{
arg: "--cpuset-mems=0",
ctrl: "cpuset",
file: "cpuset.mems",
want: "0",
},
{
arg: "--kernel-memory=100MB",
ctrl: "memory",
file: "memory.kmem.limit_in_bytes",
want: "104857600",
},
{
arg: "--memory=1GB",
ctrl: "memory",
file: "memory.limit_in_bytes",
want: "1073741824",
},
{
arg: "--memory-reservation=500MB",
ctrl: "memory",
file: "memory.soft_limit_in_bytes",
want: "524288000",
},
{
arg: "--memory-swap=2GB",
ctrl: "memory",
file: "memory.memsw.limit_in_bytes",
want: "2147483648",
skipIfNotFound: true, // swap may be disabled on the machine.
},
{
arg: "--memory-swappiness=5",
ctrl: "memory",
file: "memory.swappiness",
want: "5",
},
{
arg: "--blkio-weight=750",
ctrl: "blkio",
file: "blkio.weight",
want: "750",
},
}
args := make([]string, 0, len(attrs))
for _, attr := range attrs {
args = append(args, attr.arg)
}
args = append(args, "alpine", "sleep", "10000")
if err := d.Run(args...); err != nil {
t.Fatal("docker create failed:", err)
}
defer d.CleanUp()
gid, err := d.ID()
if err != nil {
t.Fatalf("Docker.ID() failed: %v", err)
}
t.Logf("cgroup ID: %s", gid)
// Check list of attributes defined above.
for _, attr := range attrs {
path := filepath.Join("/sys/fs/cgroup", attr.ctrl, "docker", gid, attr.file)
out, err := ioutil.ReadFile(path)
if err != nil {
if os.IsNotExist(err) && attr.skipIfNotFound {
t.Logf("skipped %s/%s", attr.ctrl, attr.file)
continue
}
t.Fatalf("failed to read %q: %v", path, err)
}
if got := strings.TrimSpace(string(out)); got != attr.want {
t.Errorf("arg: %q, cgroup attribute %s/%s, got: %q, want: %q", attr.arg, attr.ctrl, attr.file, got, attr.want)
}
}
// Check that sandbox is inside cgroup.
controllers := []string{
"blkio",
"cpu",
"cpuset",
"memory",
"net_cls",
"net_prio",
"devices",
"freezer",
"perf_event",
"pids",
"systemd",
}
pid, err := d.SandboxPid()
if err != nil {
t.Fatalf("SandboxPid: %v", err)
}
for _, ctrl := range controllers {
path := filepath.Join("/sys/fs/cgroup", ctrl, "docker", gid, "cgroup.procs")
if err := verifyPid(pid, path); err != nil {
t.Errorf("cgroup control %q processes: %v", ctrl, err)
}
}
}
func TestCgroupParent(t *testing.T) {
if err := testutil.Pull("alpine"); err != nil {
t.Fatal("docker pull failed:", err)
}
d := testutil.MakeDocker("cgroup-test")
parent := testutil.RandomName("runsc")
if err := d.Run("--cgroup-parent", parent, "alpine", "sleep", "10000"); err != nil {
t.Fatal("docker create failed:", err)
}
defer d.CleanUp()
gid, err := d.ID()
if err != nil {
t.Fatalf("Docker.ID() failed: %v", err)
}
t.Logf("cgroup ID: %s", gid)
// Check that sandbox is inside cgroup.
pid, err := d.SandboxPid()
if err != nil {
t.Fatalf("SandboxPid: %v", err)
}
// Finds cgroup for the sandbox's parent process to check that cgroup is
// created in the right location relative to the parent.
cmd := fmt.Sprintf("grep PPid: /proc/%d/status | sed 's/PPid:\\s//'", pid)
ppid, err := exec.Command("bash", "-c", cmd).CombinedOutput()
if err != nil {
t.Fatalf("Executing %q: %v", cmd, err)
}
cgroups, err := cgroup.LoadPaths(strings.TrimSpace(string(ppid)))
if err != nil {
t.Fatalf("cgroup.LoadPath(%s): %v", ppid, err)
}
path := filepath.Join("/sys/fs/cgroup/memory", cgroups["memory"], parent, gid, "cgroup.procs")
if err := verifyPid(pid, path); err != nil {
t.Errorf("cgroup control %q processes: %v", "memory", err)
}
}
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