-
Notifications
You must be signed in to change notification settings - Fork 39.2k
/
kuberuntime_container.go
256 lines (224 loc) · 9.21 KB
/
kuberuntime_container.go
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
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
/*
Copyright 2016 The Kubernetes 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 kuberuntime
import (
"fmt"
"io"
"math/rand"
"os"
"path"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
runtimeApi "k8s.io/kubernetes/pkg/kubelet/api/v1alpha1/runtime"
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
"k8s.io/kubernetes/pkg/types"
"k8s.io/kubernetes/pkg/util/term"
)
// getContainerLogsPath gets log path for container.
func getContainerLogsPath(containerName string, podUID types.UID) string {
return path.Join(podLogsRootDirectory, string(podUID), fmt.Sprintf("%s.log", containerName))
}
// generateContainerConfig generates container config for kubelet runtime api.
func (m *kubeGenericRuntimeManager) generateContainerConfig(container *api.Container, pod *api.Pod, restartCount int, podIP string) (*runtimeApi.ContainerConfig, error) {
opts, err := m.runtimeHelper.GenerateRunContainerOptions(pod, container, podIP)
if err != nil {
return nil, err
}
command, args := kubecontainer.ExpandContainerCommandAndArgs(container, opts.Envs)
containerLogsPath := getContainerLogsPath(container.Name, pod.UID)
podHasSELinuxLabel := pod.Spec.SecurityContext != nil && pod.Spec.SecurityContext.SELinuxOptions != nil
restartCountUint32 := uint32(restartCount)
config := &runtimeApi.ContainerConfig{
Metadata: &runtimeApi.ContainerMetadata{
Name: &container.Name,
Attempt: &restartCountUint32,
},
Image: &runtimeApi.ImageSpec{Image: &container.Image},
Command: command,
Args: args,
WorkingDir: &container.WorkingDir,
Labels: newContainerLabels(container, pod),
Annotations: newContainerAnnotations(container, pod, restartCount),
Mounts: makeMounts(opts, container, podHasSELinuxLabel),
LogPath: &containerLogsPath,
Stdin: &container.Stdin,
StdinOnce: &container.StdinOnce,
Tty: &container.TTY,
Linux: m.generateLinuxContainerConfig(container),
}
// set privileged and readonlyRootfs
if container.SecurityContext != nil {
securityContext := container.SecurityContext
if securityContext.Privileged != nil {
config.Privileged = securityContext.Privileged
}
if securityContext.ReadOnlyRootFilesystem != nil {
config.ReadonlyRootfs = securityContext.ReadOnlyRootFilesystem
}
}
// set environment variables
envs := make([]*runtimeApi.KeyValue, len(opts.Envs))
for idx := range opts.Envs {
e := opts.Envs[idx]
envs[idx] = &runtimeApi.KeyValue{
Key: &e.Name,
Value: &e.Value,
}
}
config.Envs = envs
return config, nil
}
// generateLinuxContainerConfig generates linux container config for kubelet runtime api.
func (m *kubeGenericRuntimeManager) generateLinuxContainerConfig(container *api.Container) *runtimeApi.LinuxContainerConfig {
linuxConfig := &runtimeApi.LinuxContainerConfig{
Resources: &runtimeApi.LinuxContainerResources{},
}
// set linux container resources
var cpuShares int64
cpuRequest := container.Resources.Requests.Cpu()
cpuLimit := container.Resources.Limits.Cpu()
memoryLimit := container.Resources.Limits.Memory().Value()
// If request is not specified, but limit is, we want request to default to limit.
// API server does this for new containers, but we repeat this logic in Kubelet
// for containers running on existing Kubernetes clusters.
if cpuRequest.IsZero() && !cpuLimit.IsZero() {
cpuShares = milliCPUToShares(cpuLimit.MilliValue())
} else {
// if cpuRequest.Amount is nil, then milliCPUToShares will return the minimal number
// of CPU shares.
cpuShares = milliCPUToShares(cpuRequest.MilliValue())
}
linuxConfig.Resources.CpuShares = &cpuShares
if memoryLimit != 0 {
linuxConfig.Resources.MemoryLimitInBytes = &memoryLimit
}
if m.cpuCFSQuota {
// if cpuLimit.Amount is nil, then the appropriate default value is returned
// to allow full usage of cpu resource.
cpuQuota, cpuPeriod := milliCPUToQuota(cpuLimit.MilliValue())
linuxConfig.Resources.CpuQuota = &cpuQuota
linuxConfig.Resources.CpuPeriod = &cpuPeriod
}
// set security context options
if container.SecurityContext != nil {
securityContext := container.SecurityContext
if securityContext.Capabilities != nil {
linuxConfig.Capabilities = &runtimeApi.Capability{
AddCapabilities: make([]string, 0, len(securityContext.Capabilities.Add)),
DropCapabilities: make([]string, 0, len(securityContext.Capabilities.Drop)),
}
for index, value := range securityContext.Capabilities.Add {
linuxConfig.Capabilities.AddCapabilities[index] = string(value)
}
for index, value := range securityContext.Capabilities.Drop {
linuxConfig.Capabilities.DropCapabilities[index] = string(value)
}
}
if securityContext.SELinuxOptions != nil {
linuxConfig.SelinuxOptions = &runtimeApi.SELinuxOption{
User: &securityContext.SELinuxOptions.User,
Role: &securityContext.SELinuxOptions.Role,
Type: &securityContext.SELinuxOptions.Type,
Level: &securityContext.SELinuxOptions.Level,
}
}
}
return linuxConfig
}
// makeMounts generates container volume mounts for kubelet runtime api.
func makeMounts(opts *kubecontainer.RunContainerOptions, container *api.Container, podHasSELinuxLabel bool) []*runtimeApi.Mount {
volumeMounts := []*runtimeApi.Mount{}
for idx := range opts.Mounts {
v := opts.Mounts[idx]
m := &runtimeApi.Mount{
Name: &v.Name,
HostPath: &v.HostPath,
ContainerPath: &v.ContainerPath,
Readonly: &v.ReadOnly,
}
if podHasSELinuxLabel && v.SELinuxRelabel {
m.SelinuxRelabel = &v.SELinuxRelabel
}
volumeMounts = append(volumeMounts, m)
}
// The reason we create and mount the log file in here (not in kubelet) is because
// the file's location depends on the ID of the container, and we need to create and
// mount the file before actually starting the container.
if opts.PodContainerDir != "" && len(container.TerminationMessagePath) != 0 {
// Because the PodContainerDir contains pod uid and container name which is unique enough,
// here we just add a random id to make the path unique for different instances
// of the same container.
cid := makeUID()
containerLogPath := path.Join(opts.PodContainerDir, cid)
fs, err := os.Create(containerLogPath)
if err != nil {
glog.Errorf("Error on creating termination-log file %q: %v", containerLogPath, err)
} else {
fs.Close()
volumeMounts = append(volumeMounts, &runtimeApi.Mount{
HostPath: &containerLogPath,
ContainerPath: &container.TerminationMessagePath,
})
}
}
return volumeMounts
}
// getKubeletContainers lists containers managed by kubelet.
// The boolean parameter specifies whether returns all containers including
// those already exited and dead containers (used for garbage collection).
func (m *kubeGenericRuntimeManager) getKubeletContainers(allContainers bool) ([]*runtimeApi.Container, error) {
filter := &runtimeApi.ContainerFilter{
LabelSelector: map[string]string{kubernetesManagedLabel: "true"},
}
if !allContainers {
runningState := runtimeApi.ContainerState_RUNNING
filter.State = &runningState
}
containers, err := m.getContainersHelper(filter)
if err != nil {
glog.Errorf("getKubeletContainers failed: %v", err)
return nil, err
}
return containers, nil
}
// getContainers lists containers by filter.
func (m *kubeGenericRuntimeManager) getContainersHelper(filter *runtimeApi.ContainerFilter) ([]*runtimeApi.Container, error) {
resp, err := m.runtimeService.ListContainers(filter)
if err != nil {
return nil, err
}
return resp, err
}
// makeUID returns a randomly generated string.
func makeUID() string {
return fmt.Sprintf("%08x", rand.Uint32())
}
// AttachContainer attaches to the container's console
func (m *kubeGenericRuntimeManager) AttachContainer(id kubecontainer.ContainerID, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool, resize <-chan term.Size) (err error) {
return fmt.Errorf("not implemented")
}
// GetContainerLogs returns logs of a specific container.
func (m *kubeGenericRuntimeManager) GetContainerLogs(pod *api.Pod, containerID kubecontainer.ContainerID, logOptions *api.PodLogOptions, stdout, stderr io.Writer) (err error) {
return fmt.Errorf("not implemented")
}
// Runs the command in the container of the specified pod using nsenter.
// Attaches the processes stdin, stdout, and stderr. Optionally uses a
// tty.
// TODO: handle terminal resizing, refer https://github.com/kubernetes/kubernetes/issues/29579
func (m *kubeGenericRuntimeManager) ExecInContainer(containerID kubecontainer.ContainerID, cmd []string, stdin io.Reader, stdout, stderr io.WriteCloser, tty bool, resize <-chan term.Size) error {
return fmt.Errorf("not implemented")
}
// DeleteContainer removes a container.
func (m *kubeGenericRuntimeManager) DeleteContainer(containerID kubecontainer.ContainerID) error {
return m.runtimeService.RemoveContainer(containerID.ID)
}