github.com/nalind/docker@v1.5.0/integration-cli/docker_cli_nat_test.go (about)

     1  package main
     2  
     3  import (
     4  	"fmt"
     5  	"net"
     6  	"os/exec"
     7  	"strings"
     8  	"testing"
     9  )
    10  
    11  func TestNetworkNat(t *testing.T) {
    12  	iface, err := net.InterfaceByName("eth0")
    13  	if err != nil {
    14  		t.Skipf("Test not running with `make test`. Interface eth0 not found: %s", err)
    15  	}
    16  
    17  	ifaceAddrs, err := iface.Addrs()
    18  	if err != nil || len(ifaceAddrs) == 0 {
    19  		t.Fatalf("Error retrieving addresses for eth0: %v (%d addresses)", err, len(ifaceAddrs))
    20  	}
    21  
    22  	ifaceIP, _, err := net.ParseCIDR(ifaceAddrs[0].String())
    23  	if err != nil {
    24  		t.Fatalf("Error retrieving the up for eth0: %s", err)
    25  	}
    26  
    27  	runCmd := exec.Command(dockerBinary, "run", "-dt", "-p", "8080:8080", "busybox", "nc", "-lp", "8080")
    28  	out, _, err := runCommandWithOutput(runCmd)
    29  	if err != nil {
    30  		t.Fatal(out, err)
    31  	}
    32  
    33  	cleanedContainerID := stripTrailingCharacters(out)
    34  
    35  	runCmd = exec.Command(dockerBinary, "run", "busybox", "sh", "-c", fmt.Sprintf("echo hello world | nc -w 30 %s 8080", ifaceIP))
    36  	out, _, err = runCommandWithOutput(runCmd)
    37  	if err != nil {
    38  		t.Fatal(out, err)
    39  	}
    40  
    41  	runCmd = exec.Command(dockerBinary, "logs", cleanedContainerID)
    42  	out, _, err = runCommandWithOutput(runCmd)
    43  	if err != nil {
    44  		t.Fatalf("failed to retrieve logs for container: %s, %v", out, err)
    45  	}
    46  
    47  	out = strings.Trim(out, "\r\n")
    48  
    49  	if expected := "hello world"; out != expected {
    50  		t.Fatalf("Unexpected output. Expected: %q, received: %q for iface %s", expected, out, ifaceIP)
    51  	}
    52  
    53  	killCmd := exec.Command(dockerBinary, "kill", cleanedContainerID)
    54  	if out, _, err = runCommandWithOutput(killCmd); err != nil {
    55  		t.Fatalf("failed to kill container: %s, %v", out, err)
    56  	}
    57  	deleteAllContainers()
    58  
    59  	logDone("network - make sure nat works through the host")
    60  }