1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
// Copyright 2018 The gVisor Authors.
//
// 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.dev/gvisor/runsc/cgroup"
"gvisor.dev/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)
}
}
|
