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Stable Networking: Keep the same network settings across container restarts.

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This change will allocate network settings (IP and public ports) at
container creation rather than start and keep them throughout the
lifetime of the container (i.e. until it gets destroyed) instead of
discarding them when the container is stopped.

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>
This commit is contained in:
Andrea Luzzardi
2014-10-03 13:46:24 -07:00
parent deffc572ce
commit a487593729
4 changed files with 87 additions and 47 deletions
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integration-cli/docker_cli_run_test.go
+69 -39
View File
@@ -1868,57 +1868,87 @@ func TestRunMutableNetworkFiles(t *testing.T) {
}
}
func TestRunHostsLinkedContainerUpdate(t *testing.T) {
deleteAllContainers()
out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "run", "-d", "--name", "c1", "busybox", "sh", "-c", "while true; do sleep 1; done"))
if err != nil {
t.Fatal(err, out)
func TestRunStableIPAndPort(t *testing.T) {
const nContainers = 2
var ids, ips, ports [nContainers]string
// Setup: Create a couple of containers and collect their IPs and public ports.
for i := 0; i < nContainers; i++ {
runCmd := exec.Command(dockerBinary, "run", "-d", "-p", "1234", "busybox", "top")
out, _, err := runCommandWithOutput(runCmd)
if err != nil {
t.Fatal(err)
}
ids[i] = strings.TrimSpace(out)
ips[i], err = inspectField(ids[i], "NetworkSettings.IPAddress")
errorOut(err, t, out)
if ips[i] == "" {
t.Fatal("IP allocation failed")
}
portCmd := exec.Command(dockerBinary, "port", ids[i], "1234")
ports[i], _, err = runCommandWithOutput(portCmd)
errorOut(err, t, out)
if ports[i] == "" {
t.Fatal("Port allocation failed")
}
}
// TODO fix docker cp and /etc/hosts
out, _, err = runCommandWithOutput(exec.Command(dockerBinary, "run", "-d", "--link", "c1:c1", "--name", "c2", "busybox", "sh", "-c", "while true;do sleep 1; done"))
if err != nil {
t.Fatal(err, out)
// Stop them all.
for _, id := range ids {
cmd := exec.Command(dockerBinary, "stop", id)
out, _, err := runCommandWithOutput(cmd)
if err != nil {
t.Fatal(err, out)
}
}
contID := strings.TrimSpace(out)
// Create a new container and ensure it's not getting the IP or port of some stopped container.
{
runCmd := exec.Command(dockerBinary, "run", "-d", "-p", "1234", "busybox", "top")
out, _, err := runCommandWithOutput(runCmd)
errorOut(err, t, out)
f, err := os.Open(filepath.Join("/var/lib/docker/containers", contID, "hosts"))
if err != nil {
t.Fatal(err)
id := strings.TrimSpace(out)
ip, err := inspectField(id, "NetworkSettings.IPAddress")
errorOut(err, t, out)
portCmd := exec.Command(dockerBinary, "port", id, "1234")
port, _, err := runCommandWithOutput(portCmd)
errorOut(err, t, out)
for i := range ids {
if ip == ips[i] {
t.Fatalf("Conflicting IP: %s", ip)
}
if port == ports[i] {
t.Fatalf("Conflicting port: %s", port)
}
}
}
originalContent, err := ioutil.ReadAll(f)
f.Close()
// Start the containers back, and ensure they are getting the same IPs and ports.
for i, id := range ids {
runCmd := exec.Command(dockerBinary, "start", id)
out, _, err := runCommandWithOutput(runCmd)
errorOut(err, t, out)
if err != nil {
t.Fatal(err)
}
ip, err := inspectField(id, "NetworkSettings.IPAddress")
errorOut(err, t, out)
portCmd := exec.Command(dockerBinary, "port", ids[i], "1234")
port, _, err := runCommandWithOutput(portCmd)
errorOut(err, t, out)
out, _, err = runCommandWithOutput(exec.Command(dockerBinary, "restart", "-t", "0", "c1"))
if err != nil {
t.Fatal(err, out)
}
f, err = os.Open(filepath.Join("/var/lib/docker/containers", contID, "hosts"))
if err != nil {
t.Fatal(err)
}
newContent, err := ioutil.ReadAll(f)
f.Close()
if err != nil {
t.Fatal(err)
}
if strings.TrimSpace(string(originalContent)) == strings.TrimSpace(string(newContent)) {
t.Fatalf("expected /etc/hosts to be updated, but wasn't")
if ips[i] != ip {
t.Fatalf("Container started with a different IP: %s != %s", ip, ips[i])
}
if ports[i] != port {
t.Fatalf("Container started with a different port: %s != %s", port, ports[i])
}
}
deleteAllContainers()
logDone("run - /etc/hosts updated in parent when restart")
logDone("run - ips and ports must not change")
}
// Ensure that CIDFile gets deleted if it's empty