mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
339 lines
11 KiB
Go
339 lines
11 KiB
Go
package main
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import (
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"fmt"
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"io/ioutil"
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"os"
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"os/exec"
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"reflect"
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"regexp"
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"strings"
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"testing"
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"time"
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"github.com/docker/docker/pkg/iptables"
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)
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func TestLinksEtcHostsRegularFile(t *testing.T) {
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defer deleteAllContainers()
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runCmd := exec.Command(dockerBinary, "run", "--net=host", "busybox", "ls", "-la", "/etc/hosts")
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out, _, _, err := runCommandWithStdoutStderr(runCmd)
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if err != nil {
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t.Fatal(out, err)
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}
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if !strings.HasPrefix(out, "-") {
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t.Errorf("/etc/hosts should be a regular file")
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}
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logDone("link - /etc/hosts is a regular file")
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}
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func TestLinksEtcHostsContentMatch(t *testing.T) {
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testRequires(t, SameHostDaemon)
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defer deleteAllContainers()
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runCmd := exec.Command(dockerBinary, "run", "--net=host", "busybox", "cat", "/etc/hosts")
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out, _, _, err := runCommandWithStdoutStderr(runCmd)
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if err != nil {
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t.Fatal(out, err)
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}
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hosts, err := ioutil.ReadFile("/etc/hosts")
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if os.IsNotExist(err) {
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t.Skip("/etc/hosts does not exist, skip this test")
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}
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if out != string(hosts) {
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t.Errorf("container")
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}
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logDone("link - /etc/hosts matches hosts copy")
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}
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func TestLinksPingUnlinkedContainers(t *testing.T) {
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runCmd := exec.Command(dockerBinary, "run", "--rm", "busybox", "sh", "-c", "ping -c 1 alias1 -W 1 && ping -c 1 alias2 -W 1")
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exitCode, err := runCommand(runCmd)
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if exitCode == 0 {
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t.Fatal("run ping did not fail")
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} else if exitCode != 1 {
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t.Fatalf("run ping failed with errors: %v", err)
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}
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logDone("links - ping unlinked container")
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}
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// Test for appropriate error when calling --link with an invalid target container
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func TestLinksInvalidContainerTarget(t *testing.T) {
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defer deleteAllContainers()
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runCmd := exec.Command(dockerBinary, "run", "--link", "bogus:alias", "busybox", "true")
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out, _, err := runCommandWithOutput(runCmd)
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if err == nil {
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t.Fatal("an invalid container target should produce an error")
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}
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if !strings.Contains(out, "Could not get container") {
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t.Fatalf("error output expected 'Could not get container', but got %q instead; err: %v", out, err)
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}
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logDone("links - linking to non-existent container should not work")
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}
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func TestLinksPingLinkedContainers(t *testing.T) {
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defer deleteAllContainers()
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runCmd := exec.Command(dockerBinary, "run", "-d", "--name", "container1", "--hostname", "fred", "busybox", "top")
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if _, err := runCommand(runCmd); err != nil {
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t.Fatal(err)
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}
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runCmd = exec.Command(dockerBinary, "run", "-d", "--name", "container2", "--hostname", "wilma", "busybox", "top")
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if _, err := runCommand(runCmd); err != nil {
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t.Fatal(err)
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}
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runArgs := []string{"run", "--rm", "--link", "container1:alias1", "--link", "container2:alias2", "busybox", "sh", "-c"}
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pingCmd := "ping -c 1 %s -W 1 && ping -c 1 %s -W 1"
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// test ping by alias, ping by name, and ping by hostname
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// 1. Ping by alias
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dockerCmd(t, append(runArgs, fmt.Sprintf(pingCmd, "alias1", "alias2"))...)
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// 2. Ping by container name
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dockerCmd(t, append(runArgs, fmt.Sprintf(pingCmd, "container1", "container2"))...)
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// 3. Ping by hostname
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dockerCmd(t, append(runArgs, fmt.Sprintf(pingCmd, "fred", "wilma"))...)
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logDone("links - ping linked container")
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}
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func TestLinksPingLinkedContainersAfterRename(t *testing.T) {
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defer deleteAllContainers()
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out, _, _ := dockerCmd(t, "run", "-d", "--name", "container1", "busybox", "top")
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idA := strings.TrimSpace(out)
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out, _, _ = dockerCmd(t, "run", "-d", "--name", "container2", "busybox", "top")
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idB := strings.TrimSpace(out)
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dockerCmd(t, "rename", "container1", "container_new")
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dockerCmd(t, "run", "--rm", "--link", "container_new:alias1", "--link", "container2:alias2", "busybox", "sh", "-c", "ping -c 1 alias1 -W 1 && ping -c 1 alias2 -W 1")
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dockerCmd(t, "kill", idA)
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dockerCmd(t, "kill", idB)
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logDone("links - ping linked container after rename")
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}
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func TestLinksIpTablesRulesWhenLinkAndUnlink(t *testing.T) {
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testRequires(t, SameHostDaemon)
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defer deleteAllContainers()
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dockerCmd(t, "run", "-d", "--name", "child", "--publish", "8080:80", "busybox", "top")
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dockerCmd(t, "run", "-d", "--name", "parent", "--link", "child:http", "busybox", "top")
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childIP := findContainerIP(t, "child")
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parentIP := findContainerIP(t, "parent")
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sourceRule := []string{"-i", "docker0", "-o", "docker0", "-p", "tcp", "-s", childIP, "--sport", "80", "-d", parentIP, "-j", "ACCEPT"}
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destinationRule := []string{"-i", "docker0", "-o", "docker0", "-p", "tcp", "-s", parentIP, "--dport", "80", "-d", childIP, "-j", "ACCEPT"}
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if !iptables.Exists("filter", "DOCKER", sourceRule...) || !iptables.Exists("filter", "DOCKER", destinationRule...) {
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t.Fatal("Iptables rules not found")
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}
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dockerCmd(t, "rm", "--link", "parent/http")
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if iptables.Exists("filter", "DOCKER", sourceRule...) || iptables.Exists("filter", "DOCKER", destinationRule...) {
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t.Fatal("Iptables rules should be removed when unlink")
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}
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dockerCmd(t, "kill", "child")
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dockerCmd(t, "kill", "parent")
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logDone("link - verify iptables when link and unlink")
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}
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func TestLinksInspectLinksStarted(t *testing.T) {
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var (
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expected = map[string]struct{}{"/container1:/testinspectlink/alias1": {}, "/container2:/testinspectlink/alias2": {}}
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result []string
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)
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defer deleteAllContainers()
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dockerCmd(t, "run", "-d", "--name", "container1", "busybox", "top")
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dockerCmd(t, "run", "-d", "--name", "container2", "busybox", "top")
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dockerCmd(t, "run", "-d", "--name", "testinspectlink", "--link", "container1:alias1", "--link", "container2:alias2", "busybox", "top")
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links, err := inspectFieldJSON("testinspectlink", "HostConfig.Links")
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if err != nil {
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t.Fatal(err)
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}
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err = unmarshalJSON([]byte(links), &result)
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if err != nil {
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t.Fatal(err)
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}
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output := convertSliceOfStringsToMap(result)
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equal := reflect.DeepEqual(output, expected)
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if !equal {
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t.Fatalf("Links %s, expected %s", result, expected)
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}
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logDone("link - links in started container inspect")
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}
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func TestLinksInspectLinksStopped(t *testing.T) {
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var (
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expected = map[string]struct{}{"/container1:/testinspectlink/alias1": {}, "/container2:/testinspectlink/alias2": {}}
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result []string
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)
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defer deleteAllContainers()
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dockerCmd(t, "run", "-d", "--name", "container1", "busybox", "top")
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dockerCmd(t, "run", "-d", "--name", "container2", "busybox", "top")
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dockerCmd(t, "run", "-d", "--name", "testinspectlink", "--link", "container1:alias1", "--link", "container2:alias2", "busybox", "true")
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links, err := inspectFieldJSON("testinspectlink", "HostConfig.Links")
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if err != nil {
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t.Fatal(err)
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}
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err = unmarshalJSON([]byte(links), &result)
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if err != nil {
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t.Fatal(err)
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}
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output := convertSliceOfStringsToMap(result)
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equal := reflect.DeepEqual(output, expected)
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if !equal {
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t.Fatalf("Links %s, but expected %s", result, expected)
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}
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logDone("link - links in stopped container inspect")
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}
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func TestLinksNotStartedParentNotFail(t *testing.T) {
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defer deleteAllContainers()
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runCmd := exec.Command(dockerBinary, "create", "--name=first", "busybox", "top")
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out, _, _, err := runCommandWithStdoutStderr(runCmd)
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if err != nil {
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t.Fatal(out, err)
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}
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runCmd = exec.Command(dockerBinary, "create", "--name=second", "--link=first:first", "busybox", "top")
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out, _, _, err = runCommandWithStdoutStderr(runCmd)
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if err != nil {
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t.Fatal(out, err)
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}
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runCmd = exec.Command(dockerBinary, "start", "first")
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out, _, _, err = runCommandWithStdoutStderr(runCmd)
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if err != nil {
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t.Fatal(out, err)
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}
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logDone("link - container start successfully updating stopped parent links")
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}
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func TestLinksHostsFilesInject(t *testing.T) {
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testRequires(t, SameHostDaemon, ExecSupport)
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defer deleteAllContainers()
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out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "run", "-itd", "--name", "one", "busybox", "top"))
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if err != nil {
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t.Fatal(err, out)
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}
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idOne := strings.TrimSpace(out)
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out, _, err = runCommandWithOutput(exec.Command(dockerBinary, "run", "-itd", "--name", "two", "--link", "one:onetwo", "busybox", "top"))
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if err != nil {
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t.Fatal(err, out)
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}
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idTwo := strings.TrimSpace(out)
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time.Sleep(1 * time.Second)
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contentOne, err := readContainerFileWithExec(idOne, "/etc/hosts")
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if err != nil {
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t.Fatal(err, string(contentOne))
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}
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contentTwo, err := readContainerFileWithExec(idTwo, "/etc/hosts")
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if err != nil {
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t.Fatal(err, string(contentTwo))
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}
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if !strings.Contains(string(contentTwo), "onetwo") {
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t.Fatal("Host is not present in updated hosts file", string(contentTwo))
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}
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logDone("link - ensure containers hosts files are updated with the link alias.")
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}
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func TestLinksNetworkHostContainer(t *testing.T) {
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defer deleteAllContainers()
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out, _, err := runCommandWithOutput(exec.Command(dockerBinary, "run", "-d", "--net", "host", "--name", "host_container", "busybox", "top"))
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if err != nil {
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t.Fatal(err, out)
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}
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out, _, err = runCommandWithOutput(exec.Command(dockerBinary, "run", "--name", "should_fail", "--link", "host_container:tester", "busybox", "true"))
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if err == nil || !strings.Contains(out, "--net=host can't be used with links. This would result in undefined behavior.") {
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t.Fatalf("Running container linking to a container with --net host should have failed: %s", out)
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}
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logDone("link - error thrown when linking to container with --net host")
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}
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func TestLinksUpdateOnRestart(t *testing.T) {
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testRequires(t, SameHostDaemon, ExecSupport)
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defer deleteAllContainers()
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if out, err := exec.Command(dockerBinary, "run", "-d", "--name", "one", "busybox", "top").CombinedOutput(); err != nil {
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t.Fatal(err, string(out))
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}
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out, err := exec.Command(dockerBinary, "run", "-d", "--name", "two", "--link", "one:onetwo", "--link", "one:one", "busybox", "top").CombinedOutput()
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if err != nil {
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t.Fatal(err, string(out))
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}
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id := strings.TrimSpace(string(out))
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realIP, err := inspectField("one", "NetworkSettings.IPAddress")
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if err != nil {
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t.Fatal(err)
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}
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content, err := readContainerFileWithExec(id, "/etc/hosts")
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if err != nil {
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t.Fatal(err, string(content))
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}
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getIP := func(hosts []byte, hostname string) string {
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re := regexp.MustCompile(fmt.Sprintf(`(\S*)\t%s`, regexp.QuoteMeta(hostname)))
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matches := re.FindSubmatch(hosts)
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if matches == nil {
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t.Fatalf("Hostname %s have no matches in hosts", hostname)
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}
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return string(matches[1])
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}
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if ip := getIP(content, "one"); ip != realIP {
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t.Fatalf("For 'one' alias expected IP: %s, got: %s", realIP, ip)
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}
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if ip := getIP(content, "onetwo"); ip != realIP {
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t.Fatalf("For 'onetwo' alias expected IP: %s, got: %s", realIP, ip)
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}
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if out, err := exec.Command(dockerBinary, "restart", "one").CombinedOutput(); err != nil {
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t.Fatal(err, string(out))
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}
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realIP, err = inspectField("one", "NetworkSettings.IPAddress")
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if err != nil {
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t.Fatal(err)
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}
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content, err = readContainerFileWithExec(id, "/etc/hosts")
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if err != nil {
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t.Fatal(err, string(content))
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}
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if ip := getIP(content, "one"); ip != realIP {
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t.Fatalf("For 'one' alias expected IP: %s, got: %s", realIP, ip)
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}
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if ip := getIP(content, "onetwo"); ip != realIP {
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t.Fatalf("For 'onetwo' alias expected IP: %s, got: %s", realIP, ip)
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}
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logDone("link - ensure containers hosts files are updated on restart")
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}
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