-
Notifications
You must be signed in to change notification settings - Fork 1
/
ola.go
94 lines (78 loc) · 1.97 KB
/
ola.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
package main
import (
"log"
"os"
"strings"
docker "github.com/fsouza/go-dockerclient"
)
var (
dockerEndpoint = "unix:///var/run/docker.sock"
)
func main() {
networkName := os.Getenv("ADD_TO_NETWORK")
if networkName == "" {
log.Fatal("No network name?")
}
client, err := docker.NewClient(dockerEndpoint)
if err != nil {
log.Fatal(err)
}
addContainerNetwork := func(cid string) {
log.Printf("Checking if container %s should be added to the %s network\n", cid, networkName)
container, err := client.InspectContainer(cid)
if err != nil {
log.Println(err)
return
}
if container.Config.Labels["com.docker.swarm.service.id"] == "" {
log.Printf("IGNORING: container %s is not a service\n", cid)
return
}
expand := func(key string) string {
for _, v := range container.Config.Env {
if strings.HasPrefix(v, key+"=") {
return strings.SplitN(v, "=", 2)[1]
}
}
return ""
}
if os.Expand("$OLA_IGNORE", expand) != "" {
log.Printf("IGNORING: container %s has set $OLA_IGNORE\n", cid)
return
}
for name, _ := range container.NetworkSettings.Networks {
if name == networkName {
log.Printf("IGNORING: container %s is already a member of %s\n", cid, networkName)
return
}
}
err = client.ConnectNetwork(networkName, docker.NetworkConnectionOptions{Container: cid})
if err != nil {
log.Println(err)
return
}
log.Printf("Added container %s to network %s\n", cid, networkName)
}
events := make(chan *docker.APIEvents)
err = client.AddEventListener(events)
if err != nil {
log.Fatal(err)
}
containers, _ := client.ListContainers(docker.ListContainersOptions{})
for _, c := range containers {
go addContainerNetwork(c.ID)
}
for {
select {
case event, ok := <-events:
if !ok {
log.Println("Events closed")
os.Exit(2)
}
log.Printf("Got event %s for container %s", event.Action, event.Actor.ID)
if event.Action == "start" {
go addContainerNetwork(event.Actor.ID)
}
}
}
}