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
|
// +build linux
package libpod
import (
"context"
"strings"
"github.com/containers/podman/v2/libpod/define"
"github.com/containers/podman/v2/libpod/image"
"github.com/containers/podman/v2/pkg/rootless"
"github.com/containers/podman/v2/pkg/util"
v1 "github.com/opencontainers/image-spec/specs-go/v1"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/runtime-tools/generate"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
const (
// IDTruncLength is the length of the pod's id that will be used to make the
// infra container name
IDTruncLength = 12
)
func (r *Runtime) makeInfraContainer(ctx context.Context, p *Pod, imgName, rawImageName, imgID string, config *v1.ImageConfig) (*Container, error) {
// Set up generator for infra container defaults
g, err := generate.New("linux")
if err != nil {
return nil, err
}
// Set Pod hostname
g.Config.Hostname = p.config.Hostname
var options []CtrCreateOption
// Command: If user-specified, use that preferentially.
// If not set and the config file is set, fall back to that.
var infraCtrCommand []string
if p.config.InfraContainer.InfraCommand != nil {
logrus.Debugf("User-specified infra container entrypoint %v", p.config.InfraContainer.InfraCommand)
infraCtrCommand = p.config.InfraContainer.InfraCommand
} else if r.config.Engine.InfraCommand != "" {
logrus.Debugf("Config-specified infra container entrypoint %s", r.config.Engine.InfraCommand)
infraCtrCommand = []string{r.config.Engine.InfraCommand}
}
// Only if set by the user or containers.conf, we set entrypoint for the
// infra container.
// This is only used by commit, so it shouldn't matter... But someone
// may eventually want to commit an infra container?
// TODO: Should we actually do this if set by containers.conf?
if infraCtrCommand != nil {
// Need to duplicate the array - we are going to add Cmd later
// so the current array will be changed.
newArr := make([]string, 0, len(infraCtrCommand))
newArr = append(newArr, infraCtrCommand...)
options = append(options, WithEntrypoint(newArr))
}
isRootless := rootless.IsRootless()
// I've seen circumstances where config is being passed as nil.
// Let's err on the side of safety and make sure it's safe to use.
if config != nil {
if infraCtrCommand == nil {
// If we have no entrypoint and command from the image,
// we can't go on - the infra container has no command.
if len(config.Entrypoint) == 0 && len(config.Cmd) == 0 {
return nil, errors.Errorf("infra container has no command")
}
if len(config.Entrypoint) > 0 {
infraCtrCommand = config.Entrypoint
} else {
// Use the Docker default "/bin/sh -c"
// entrypoint, as we're overriding command.
// If an image doesn't want this, it can
// override entrypoint too.
infraCtrCommand = []string{"/bin/sh", "-c"}
}
}
if len(config.Cmd) > 0 {
infraCtrCommand = append(infraCtrCommand, config.Cmd...)
}
if len(config.Env) > 0 {
for _, nameValPair := range config.Env {
nameValSlice := strings.Split(nameValPair, "=")
if len(nameValSlice) < 2 {
return nil, errors.Errorf("Invalid environment variable structure in pause image")
}
g.AddProcessEnv(nameValSlice[0], nameValSlice[1])
}
}
switch {
case p.config.InfraContainer.HostNetwork:
if err := g.RemoveLinuxNamespace(string(spec.NetworkNamespace)); err != nil {
return nil, errors.Wrapf(err, "error removing network namespace from pod %s infra container", p.ID())
}
case p.config.InfraContainer.NoNetwork:
// Do nothing - we have a network namespace by default,
// but should not configure slirp.
default:
// Since user namespace sharing is not implemented, we only need to check if it's rootless
netmode := "bridge"
if isRootless || p.config.InfraContainer.Slirp4netns {
netmode = "slirp4netns"
if len(p.config.InfraContainer.NetworkOptions) != 0 {
options = append(options, WithNetworkOptions(p.config.InfraContainer.NetworkOptions))
}
}
// PostConfigureNetNS should not be set since user namespace sharing is not implemented
// and rootless networking no longer supports post configuration setup
options = append(options, WithNetNS(p.config.InfraContainer.PortBindings, false, netmode, p.config.InfraContainer.Networks))
}
// For each option in InfraContainerConfig - if set, pass into
// the infra container we're creating with the appropriate
// With... option.
if p.config.InfraContainer.StaticIP != nil {
options = append(options, WithStaticIP(p.config.InfraContainer.StaticIP))
}
if p.config.InfraContainer.StaticMAC != nil {
options = append(options, WithStaticMAC(p.config.InfraContainer.StaticMAC))
}
if p.config.InfraContainer.UseImageResolvConf {
options = append(options, WithUseImageResolvConf())
}
if len(p.config.InfraContainer.DNSServer) > 0 {
options = append(options, WithDNS(p.config.InfraContainer.DNSServer))
}
if len(p.config.InfraContainer.DNSSearch) > 0 {
options = append(options, WithDNSSearch(p.config.InfraContainer.DNSSearch))
}
if len(p.config.InfraContainer.DNSOption) > 0 {
options = append(options, WithDNSOption(p.config.InfraContainer.DNSOption))
}
if p.config.InfraContainer.UseImageHosts {
options = append(options, WithUseImageHosts())
}
if len(p.config.InfraContainer.HostAdd) > 0 {
options = append(options, WithHosts(p.config.InfraContainer.HostAdd))
}
if len(p.config.InfraContainer.ExitCommand) > 0 {
options = append(options, WithExitCommand(p.config.InfraContainer.ExitCommand))
}
}
g.SetRootReadonly(true)
g.SetProcessArgs(infraCtrCommand)
logrus.Debugf("Using %q as infra container command", infraCtrCommand)
g.RemoveMount("/dev/shm")
if isRootless {
g.RemoveMount("/dev/pts")
devPts := spec.Mount{
Destination: "/dev/pts",
Type: "devpts",
Source: "devpts",
Options: []string{"private", "nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620"},
}
g.AddMount(devPts)
}
// Add default sysctls from containers.conf
defaultSysctls, err := util.ValidateSysctls(r.config.Sysctls())
if err != nil {
return nil, err
}
for sysctlKey, sysctlVal := range defaultSysctls {
// Ignore mqueue sysctls if not sharing IPC
if !p.config.UsePodIPC && strings.HasPrefix(sysctlKey, "fs.mqueue.") {
logrus.Infof("Sysctl %s=%s ignored in containers.conf, since IPC Namespace for pod is unused", sysctlKey, sysctlVal)
continue
}
// Ignore net sysctls if host network or not sharing network
if (p.config.InfraContainer.HostNetwork || !p.config.UsePodNet) && strings.HasPrefix(sysctlKey, "net.") {
logrus.Infof("Sysctl %s=%s ignored in containers.conf, since Network Namespace for pod is unused", sysctlKey, sysctlVal)
continue
}
// Ignore uts sysctls if not sharing UTS
if !p.config.UsePodUTS && (strings.HasPrefix(sysctlKey, "kernel.domainname") || strings.HasPrefix(sysctlKey, "kernel.hostname")) {
logrus.Infof("Sysctl %s=%s ignored in containers.conf, since UTS Namespace for pod is unused", sysctlKey, sysctlVal)
continue
}
g.AddLinuxSysctl(sysctlKey, sysctlVal)
}
containerName := p.ID()[:IDTruncLength] + "-infra"
options = append(options, r.WithPod(p))
options = append(options, WithRootFSFromImage(imgID, imgName, rawImageName))
options = append(options, WithName(containerName))
options = append(options, withIsInfra())
if len(p.config.InfraContainer.ConmonPidFile) > 0 {
options = append(options, WithConmonPidFile(p.config.InfraContainer.ConmonPidFile))
}
return r.newContainer(ctx, g.Config, options...)
}
// createInfraContainer wrap creates an infra container for a pod.
// An infra container becomes the basis for kernel namespace sharing between
// containers in the pod.
func (r *Runtime) createInfraContainer(ctx context.Context, p *Pod) (*Container, error) {
if !r.valid {
return nil, define.ErrRuntimeStopped
}
img := p.config.InfraContainer.InfraImage
if img == "" {
img = r.config.Engine.InfraImage
}
newImage, err := r.ImageRuntime().New(ctx, img, "", "", nil, nil, image.SigningOptions{}, nil, util.PullImageMissing)
if err != nil {
return nil, err
}
data, err := newImage.InspectNoSize(ctx)
if err != nil {
return nil, err
}
imageName := newImage.Names()[0]
imageID := data.ID
return r.makeInfraContainer(ctx, p, imageName, r.config.Engine.InfraImage, imageID, data.Config)
}
|
