forked from openshift/origin
-
Notifications
You must be signed in to change notification settings - Fork 0
/
node.go
223 lines (194 loc) · 7.25 KB
/
node.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
package kubernetes
import (
"fmt"
"net"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
kapi "github.com/GoogleCloudPlatform/kubernetes/pkg/api"
"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/dockertools"
"github.com/GoogleCloudPlatform/kubernetes/pkg/proxy"
pconfig "github.com/GoogleCloudPlatform/kubernetes/pkg/proxy/config"
"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
kexec "github.com/GoogleCloudPlatform/kubernetes/pkg/util/exec"
"github.com/GoogleCloudPlatform/kubernetes/pkg/util/iptables"
dockerclient "github.com/fsouza/go-dockerclient"
"github.com/golang/glog"
cmdutil "github.com/openshift/origin/pkg/cmd/util"
dockerutil "github.com/openshift/origin/pkg/cmd/util/docker"
)
type commandExecutor interface {
LookPath(executable string) (string, error)
Run(command string, args ...string) error
}
type defaultCommandExecutor struct{}
func (ce defaultCommandExecutor) LookPath(executable string) (string, error) {
return exec.LookPath(executable)
}
func (ce defaultCommandExecutor) Run(command string, args ...string) error {
c := exec.Command(command, args...)
return c.Run()
}
const minimumDockerAPIVersionWithPullByID = "1.18"
// EnsureDocker attempts to connect to the Docker daemon defined by the helper,
// and if it is unable to it will print a warning.
func (c *NodeConfig) EnsureDocker(docker *dockerutil.Helper) {
dockerClient, dockerAddr := docker.GetClientOrExit()
if err := dockerClient.Ping(); err != nil {
c.HandleDockerError(fmt.Sprintf("Docker could not be reached at %s. Docker must be installed and running to start containers.\n%v", dockerAddr, err))
return
}
glog.Infof("Connecting to Docker at %s", dockerAddr)
env, err := dockerClient.Version()
if err != nil {
c.HandleDockerError(fmt.Sprintf("Unable to check for Docker server version.\n%v", err))
return
}
serverVersionString := env.Get("ApiVersion")
serverVersion, err := dockerclient.NewAPIVersion(serverVersionString)
if err != nil {
c.HandleDockerError(fmt.Sprintf("Unable to determine Docker server version from %q.\n%v", serverVersionString, err))
return
}
minimumPullByIDVersion, err := dockerclient.NewAPIVersion(minimumDockerAPIVersionWithPullByID)
if err != nil {
c.HandleDockerError(fmt.Sprintf("Unable to check for Docker server version.\n%v", err))
return
}
if serverVersion.LessThan(minimumPullByIDVersion) {
c.HandleDockerError(fmt.Sprintf("Docker 1.6 or later (server API version 1.18 or later) required."))
return
}
c.DockerClient = dockerClient
}
// HandleDockerError handles an an error from the docker daemon
func (c *NodeConfig) HandleDockerError(message string) {
if !c.AllowDisabledDocker {
glog.Fatalf("ERROR: %s", message)
}
glog.Errorf("WARNING: %s", message)
c.DockerClient = &dockertools.FakeDockerClient{VersionInfo: dockerclient.Env{"ApiVersion=1.18"}}
}
// EnsureVolumeDir attempts to convert the provided volume directory argument to
// an absolute path and create the directory if it does not exist. Will exit if
// an error is encountered.
func (c *NodeConfig) EnsureVolumeDir() {
if volumeDir, err := c.initializeVolumeDir(&defaultCommandExecutor{}, c.VolumeDir); err != nil {
glog.Fatal(err)
} else {
c.VolumeDir = volumeDir
}
}
func (c *NodeConfig) initializeVolumeDir(ce commandExecutor, path string) (string, error) {
rootDirectory, err := filepath.Abs(path)
if err != nil {
return "", fmt.Errorf("Error converting volume directory to an absolute path: %v", err)
}
if _, err := os.Stat(rootDirectory); os.IsNotExist(err) {
if err := os.MkdirAll(rootDirectory, 0750); err != nil {
return "", fmt.Errorf("Couldn't create kubelet volume root directory '%s': %s", rootDirectory, err)
}
if chconPath, err := ce.LookPath("chcon"); err != nil {
glog.V(2).Infof("Couldn't locate 'chcon' to set the kubelet volume root directory SELinux context: %s", err)
} else {
if err := ce.Run(chconPath, "-t", "svirt_sandbox_file_t", rootDirectory); err != nil {
glog.Warningf("Error running 'chcon' to set the kubelet volume root directory SELinux context: %s", err)
}
}
}
return rootDirectory, nil
}
// RunKubelet starts the Kubelet.
func (c *NodeConfig) RunKubelet() {
// TODO: clean this up and make it more formal (service named 'dns'?). Use multiple ports.
clusterDNS := c.KubeletConfig.ClusterDNS
if clusterDNS == nil {
if service, err := c.Client.Endpoints(kapi.NamespaceDefault).Get("kubernetes"); err == nil {
if ip, ok := firstIP(service, 53); ok {
if err := cmdutil.WaitForSuccessfulDial(false, "tcp", fmt.Sprintf("%s:%d", ip, 53), 50*time.Millisecond, 0, 2); err == nil {
c.KubeletConfig.ClusterDNS = util.IP(net.ParseIP(ip))
}
}
}
}
c.KubeletConfig.DockerClient = c.DockerClient
// updated by NodeConfig.EnsureVolumeDir
c.KubeletConfig.RootDirectory = c.VolumeDir
go func() {
glog.Fatal(c.KubeletServer.Run(c.KubeletConfig))
}()
}
// RunProxy starts the proxy
func (c *NodeConfig) RunProxy() {
// initialize kube proxy
serviceConfig := pconfig.NewServiceConfig()
endpointsConfig := pconfig.NewEndpointsConfig()
loadBalancer := proxy.NewLoadBalancerRR()
endpointsConfig.RegisterHandler(loadBalancer)
host, _, err := net.SplitHostPort(c.BindAddress)
if err != nil {
glog.Fatalf("The provided value to bind to must be an ip:port %q", c.BindAddress)
}
ip := net.ParseIP(host)
if ip == nil {
glog.Fatalf("The provided value to bind to must be an ip:port: %q", c.BindAddress)
}
protocol := iptables.ProtocolIpv4
if ip.To4() == nil {
protocol = iptables.ProtocolIpv6
}
go util.Forever(func() {
proxier, err := proxy.NewProxier(loadBalancer, ip, iptables.New(kexec.New(), protocol))
if err != nil {
switch {
// conflicting use of iptables, retry
case proxy.IsProxyLocked(err):
glog.Errorf("Unable to start proxy, will retry: %v", err)
return
// on a system without iptables
case strings.Contains(err.Error(), "executable file not found in path"):
glog.V(4).Infof("kube-proxy initialization error: %v", err)
glog.Warningf("WARNING: Could not find the iptables command. The service proxy requires iptables and will be disabled.")
case err == proxy.ErrProxyOnLocalhost:
glog.Warningf("WARNING: The service proxy cannot bind to localhost and will be disabled.")
case strings.Contains(err.Error(), "you must be root"):
glog.Warningf("WARNING: Could not modify iptables. You must run this process as root to use the service proxy.")
default:
glog.Warningf("WARNING: Could not modify iptables. You must run this process as root to use the service proxy: %v", err)
}
select {}
}
pconfig.NewSourceAPI(
c.Client.Services(kapi.NamespaceAll),
c.Client.Endpoints(kapi.NamespaceAll),
30*time.Second,
serviceConfig.Channel("api"),
endpointsConfig.Channel("api"))
serviceConfig.RegisterHandler(proxier)
glog.Infof("Started Kubernetes Proxy on %s", host)
select {}
}, 5*time.Second)
}
// TODO: more generic location
func includesPort(ports []kapi.EndpointPort, port int) bool {
for _, p := range ports {
if p.Port == port {
return true
}
}
return false
}
// TODO: more generic location
func firstIP(endpoints *kapi.Endpoints, port int) (string, bool) {
for _, s := range endpoints.Subsets {
if !includesPort(s.Ports, port) {
continue
}
for _, a := range s.Addresses {
return a.IP, true
}
}
return "", false
}