package main import ( "encoding/json" "fmt" "regexp" "sort" "strings" "testing" "github.com/docker/docker/runconfig" "gotest.tools/assert" "gotest.tools/assert/cmp" ) func (s *DockerSuite) TestLinksPingUnlinkedContainers(c *testing.T) { testRequires(c, DaemonIsLinux) _, exitCode, err := dockerCmdWithError("run", "--rm", "busybox", "sh", "-c", "ping -c 1 alias1 -W 1 && ping -c 1 alias2 -W 1") // run ping failed with error assert.Equal(c, exitCode, 1, fmt.Sprintf("error: %v", err)) } // Test for appropriate error when calling --link with an invalid target container func (s *DockerSuite) TestLinksInvalidContainerTarget(c *testing.T) { testRequires(c, DaemonIsLinux) out, _, err := dockerCmdWithError("run", "--link", "bogus:alias", "busybox", "true") // an invalid container target should produce an error assert.Assert(c, err != nil, "out: %s", out) // an invalid container target should produce an error // note: convert the output to lowercase first as the error string // capitalization was changed after API version 1.32 assert.Assert(c, strings.Contains(strings.ToLower(out), "could not get container")) } func (s *DockerSuite) TestLinksPingLinkedContainers(c *testing.T) { testRequires(c, DaemonIsLinux) // Test with the three different ways of specifying the default network on Linux testLinkPingOnNetwork(c, "") testLinkPingOnNetwork(c, "default") testLinkPingOnNetwork(c, "bridge") } func testLinkPingOnNetwork(c *testing.T, network string) { var postArgs []string if network != "" { postArgs = append(postArgs, []string{"--net", network}...) } postArgs = append(postArgs, []string{"busybox", "top"}...) runArgs1 := append([]string{"run", "-d", "--name", "container1", "--hostname", "fred"}, postArgs...) runArgs2 := append([]string{"run", "-d", "--name", "container2", "--hostname", "wilma"}, postArgs...) // Run the two named containers dockerCmd(c, runArgs1...) dockerCmd(c, runArgs2...) postArgs = []string{} if network != "" { postArgs = append(postArgs, []string{"--net", network}...) } postArgs = append(postArgs, []string{"busybox", "sh", "-c"}...) // Format a run for a container which links to the other two runArgs := append([]string{"run", "--rm", "--link", "container1:alias1", "--link", "container2:alias2"}, postArgs...) pingCmd := "ping -c 1 %s -W 1 && ping -c 1 %s -W 1" // test ping by alias, ping by name, and ping by hostname // 1. Ping by alias dockerCmd(c, append(runArgs, fmt.Sprintf(pingCmd, "alias1", "alias2"))...) // 2. Ping by container name dockerCmd(c, append(runArgs, fmt.Sprintf(pingCmd, "container1", "container2"))...) // 3. Ping by hostname dockerCmd(c, append(runArgs, fmt.Sprintf(pingCmd, "fred", "wilma"))...) // Clean for next round dockerCmd(c, "rm", "-f", "container1") dockerCmd(c, "rm", "-f", "container2") } func (s *DockerSuite) TestLinksPingLinkedContainersAfterRename(c *testing.T) { testRequires(c, DaemonIsLinux) out, _ := dockerCmd(c, "run", "-d", "--name", "container1", "busybox", "top") idA := strings.TrimSpace(out) out, _ = dockerCmd(c, "run", "-d", "--name", "container2", "busybox", "top") idB := strings.TrimSpace(out) dockerCmd(c, "rename", "container1", "container_new") dockerCmd(c, "run", "--rm", "--link", "container_new:alias1", "--link", "container2:alias2", "busybox", "sh", "-c", "ping -c 1 alias1 -W 1 && ping -c 1 alias2 -W 1") dockerCmd(c, "kill", idA) dockerCmd(c, "kill", idB) } func (s *DockerSuite) TestLinksInspectLinksStarted(c *testing.T) { testRequires(c, DaemonIsLinux) dockerCmd(c, "run", "-d", "--name", "container1", "busybox", "top") dockerCmd(c, "run", "-d", "--name", "container2", "busybox", "top") dockerCmd(c, "run", "-d", "--name", "testinspectlink", "--link", "container1:alias1", "--link", "container2:alias2", "busybox", "top") links := inspectFieldJSON(c, "testinspectlink", "HostConfig.Links") var result []string err := json.Unmarshal([]byte(links), &result) assert.NilError(c, err) var expected = []string{ "/container1:/testinspectlink/alias1", "/container2:/testinspectlink/alias2", } sort.Strings(result) assert.DeepEqual(c, result, expected) } func (s *DockerSuite) TestLinksInspectLinksStopped(c *testing.T) { testRequires(c, DaemonIsLinux) dockerCmd(c, "run", "-d", "--name", "container1", "busybox", "top") dockerCmd(c, "run", "-d", "--name", "container2", "busybox", "top") dockerCmd(c, "run", "-d", "--name", "testinspectlink", "--link", "container1:alias1", "--link", "container2:alias2", "busybox", "true") links := inspectFieldJSON(c, "testinspectlink", "HostConfig.Links") var result []string err := json.Unmarshal([]byte(links), &result) assert.NilError(c, err) var expected = []string{ "/container1:/testinspectlink/alias1", "/container2:/testinspectlink/alias2", } sort.Strings(result) assert.DeepEqual(c, result, expected) } func (s *DockerSuite) TestLinksNotStartedParentNotFail(c *testing.T) { testRequires(c, DaemonIsLinux) dockerCmd(c, "create", "--name=first", "busybox", "top") dockerCmd(c, "create", "--name=second", "--link=first:first", "busybox", "top") dockerCmd(c, "start", "first") } func (s *DockerSuite) TestLinksHostsFilesInject(c *testing.T) { testRequires(c, DaemonIsLinux) testRequires(c, testEnv.IsLocalDaemon) out, _ := dockerCmd(c, "run", "-itd", "--name", "one", "busybox", "top") idOne := strings.TrimSpace(out) out, _ = dockerCmd(c, "run", "-itd", "--name", "two", "--link", "one:onetwo", "busybox", "top") idTwo := strings.TrimSpace(out) assert.Assert(c, waitRun(idTwo) == nil) readContainerFileWithExec(c, idOne, "/etc/hosts") contentTwo := readContainerFileWithExec(c, idTwo, "/etc/hosts") // Host is not present in updated hosts file assert.Assert(c, strings.Contains(string(contentTwo), "onetwo")) } func (s *DockerSuite) TestLinksUpdateOnRestart(c *testing.T) { testRequires(c, DaemonIsLinux) testRequires(c, testEnv.IsLocalDaemon) dockerCmd(c, "run", "-d", "--name", "one", "busybox", "top") out, _ := dockerCmd(c, "run", "-d", "--name", "two", "--link", "one:onetwo", "--link", "one:one", "busybox", "top") id := strings.TrimSpace(out) realIP := inspectField(c, "one", "NetworkSettings.Networks.bridge.IPAddress") content := readContainerFileWithExec(c, id, "/etc/hosts") getIP := func(hosts []byte, hostname string) string { re := regexp.MustCompile(fmt.Sprintf(`(\S*)\t%s`, regexp.QuoteMeta(hostname))) matches := re.FindSubmatch(hosts) assert.Assert(c, matches != nil, "Hostname %s have no matches in hosts", hostname) return string(matches[1]) } ip := getIP(content, "one") assert.Equal(c, ip, realIP) ip = getIP(content, "onetwo") assert.Equal(c, ip, realIP) dockerCmd(c, "restart", "one") realIP = inspectField(c, "one", "NetworkSettings.Networks.bridge.IPAddress") content = readContainerFileWithExec(c, id, "/etc/hosts") ip = getIP(content, "one") assert.Equal(c, ip, realIP) ip = getIP(content, "onetwo") assert.Equal(c, ip, realIP) } func (s *DockerSuite) TestLinksEnvs(c *testing.T) { testRequires(c, DaemonIsLinux) dockerCmd(c, "run", "-d", "-e", "e1=", "-e", "e2=v2", "-e", "e3=v3=v3", "--name=first", "busybox", "top") out, _ := dockerCmd(c, "run", "--name=second", "--link=first:first", "busybox", "env") assert.Assert(c, strings.Contains(out, "FIRST_ENV_e1=\n")) assert.Assert(c, strings.Contains(out, "FIRST_ENV_e2=v2")) assert.Assert(c, strings.Contains(out, "FIRST_ENV_e3=v3=v3")) } func (s *DockerSuite) TestLinkShortDefinition(c *testing.T) { testRequires(c, DaemonIsLinux) out, _ := dockerCmd(c, "run", "-d", "--name", "shortlinkdef", "busybox", "top") cid := strings.TrimSpace(out) assert.Assert(c, waitRun(cid) == nil) out, _ = dockerCmd(c, "run", "-d", "--name", "link2", "--link", "shortlinkdef", "busybox", "top") cid2 := strings.TrimSpace(out) assert.Assert(c, waitRun(cid2) == nil) links := inspectFieldJSON(c, cid2, "HostConfig.Links") assert.Equal(c, links, "[\"/shortlinkdef:/link2/shortlinkdef\"]") } func (s *DockerSuite) TestLinksNetworkHostContainer(c *testing.T) { testRequires(c, DaemonIsLinux, NotUserNamespace) dockerCmd(c, "run", "-d", "--net", "host", "--name", "host_container", "busybox", "top") out, _, err := dockerCmdWithError("run", "--name", "should_fail", "--link", "host_container:tester", "busybox", "true") // Running container linking to a container with --net host should have failed assert.Assert(c, err != nil, "out: %s", out) // Running container linking to a container with --net host should have failed assert.Assert(c, strings.Contains(out, runconfig.ErrConflictHostNetworkAndLinks.Error())) } func (s *DockerSuite) TestLinksEtcHostsRegularFile(c *testing.T) { testRequires(c, DaemonIsLinux, NotUserNamespace) out, _ := dockerCmd(c, "run", "--net=host", "busybox", "ls", "-la", "/etc/hosts") // /etc/hosts should be a regular file assert.Assert(c, cmp.Regexp("^-.+\n$", out)) } func (s *DockerSuite) TestLinksMultipleWithSameName(c *testing.T) { testRequires(c, DaemonIsLinux) dockerCmd(c, "run", "-d", "--name=upstream-a", "busybox", "top") dockerCmd(c, "run", "-d", "--name=upstream-b", "busybox", "top") dockerCmd(c, "run", "--link", "upstream-a:upstream", "--link", "upstream-b:upstream", "busybox", "sh", "-c", "ping -c 1 upstream") }