github.com/jiasir/docker@v1.3.3-0.20170609024000-252e610103e7/integration-cli/docker_cli_links_test.go (about)

     1  package main
     2  
     3  import (
     4  	"encoding/json"
     5  	"fmt"
     6  	"regexp"
     7  	"strings"
     8  
     9  	"github.com/docker/docker/integration-cli/checker"
    10  	"github.com/docker/docker/pkg/testutil"
    11  	"github.com/docker/docker/runconfig"
    12  	"github.com/go-check/check"
    13  )
    14  
    15  func (s *DockerSuite) TestLinksPingUnlinkedContainers(c *check.C) {
    16  	testRequires(c, DaemonIsLinux)
    17  	_, exitCode, err := dockerCmdWithError("run", "--rm", "busybox", "sh", "-c", "ping -c 1 alias1 -W 1 && ping -c 1 alias2 -W 1")
    18  
    19  	// run ping failed with error
    20  	c.Assert(exitCode, checker.Equals, 1, check.Commentf("error: %v", err))
    21  }
    22  
    23  // Test for appropriate error when calling --link with an invalid target container
    24  func (s *DockerSuite) TestLinksInvalidContainerTarget(c *check.C) {
    25  	testRequires(c, DaemonIsLinux)
    26  	out, _, err := dockerCmdWithError("run", "--link", "bogus:alias", "busybox", "true")
    27  
    28  	// an invalid container target should produce an error
    29  	c.Assert(err, checker.NotNil, check.Commentf("out: %s", out))
    30  	// an invalid container target should produce an error
    31  	c.Assert(out, checker.Contains, "Could not get container")
    32  }
    33  
    34  func (s *DockerSuite) TestLinksPingLinkedContainers(c *check.C) {
    35  	testRequires(c, DaemonIsLinux)
    36  	// Test with the three different ways of specifying the default network on Linux
    37  	testLinkPingOnNetwork(c, "")
    38  	testLinkPingOnNetwork(c, "default")
    39  	testLinkPingOnNetwork(c, "bridge")
    40  }
    41  
    42  func testLinkPingOnNetwork(c *check.C, network string) {
    43  	var postArgs []string
    44  	if network != "" {
    45  		postArgs = append(postArgs, []string{"--net", network}...)
    46  	}
    47  	postArgs = append(postArgs, []string{"busybox", "top"}...)
    48  	runArgs1 := append([]string{"run", "-d", "--name", "container1", "--hostname", "fred"}, postArgs...)
    49  	runArgs2 := append([]string{"run", "-d", "--name", "container2", "--hostname", "wilma"}, postArgs...)
    50  
    51  	// Run the two named containers
    52  	dockerCmd(c, runArgs1...)
    53  	dockerCmd(c, runArgs2...)
    54  
    55  	postArgs = []string{}
    56  	if network != "" {
    57  		postArgs = append(postArgs, []string{"--net", network}...)
    58  	}
    59  	postArgs = append(postArgs, []string{"busybox", "sh", "-c"}...)
    60  
    61  	// Format a run for a container which links to the other two
    62  	runArgs := append([]string{"run", "--rm", "--link", "container1:alias1", "--link", "container2:alias2"}, postArgs...)
    63  	pingCmd := "ping -c 1 %s -W 1 && ping -c 1 %s -W 1"
    64  
    65  	// test ping by alias, ping by name, and ping by hostname
    66  	// 1. Ping by alias
    67  	dockerCmd(c, append(runArgs, fmt.Sprintf(pingCmd, "alias1", "alias2"))...)
    68  	// 2. Ping by container name
    69  	dockerCmd(c, append(runArgs, fmt.Sprintf(pingCmd, "container1", "container2"))...)
    70  	// 3. Ping by hostname
    71  	dockerCmd(c, append(runArgs, fmt.Sprintf(pingCmd, "fred", "wilma"))...)
    72  
    73  	// Clean for next round
    74  	dockerCmd(c, "rm", "-f", "container1")
    75  	dockerCmd(c, "rm", "-f", "container2")
    76  }
    77  
    78  func (s *DockerSuite) TestLinksPingLinkedContainersAfterRename(c *check.C) {
    79  	testRequires(c, DaemonIsLinux)
    80  	out, _ := dockerCmd(c, "run", "-d", "--name", "container1", "busybox", "top")
    81  	idA := strings.TrimSpace(out)
    82  	out, _ = dockerCmd(c, "run", "-d", "--name", "container2", "busybox", "top")
    83  	idB := strings.TrimSpace(out)
    84  	dockerCmd(c, "rename", "container1", "container_new")
    85  	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")
    86  	dockerCmd(c, "kill", idA)
    87  	dockerCmd(c, "kill", idB)
    88  
    89  }
    90  
    91  func (s *DockerSuite) TestLinksInspectLinksStarted(c *check.C) {
    92  	testRequires(c, DaemonIsLinux)
    93  	var (
    94  		expected = map[string]struct{}{"/container1:/testinspectlink/alias1": {}, "/container2:/testinspectlink/alias2": {}}
    95  		result   []string
    96  	)
    97  	dockerCmd(c, "run", "-d", "--name", "container1", "busybox", "top")
    98  	dockerCmd(c, "run", "-d", "--name", "container2", "busybox", "top")
    99  	dockerCmd(c, "run", "-d", "--name", "testinspectlink", "--link", "container1:alias1", "--link", "container2:alias2", "busybox", "top")
   100  	links := inspectFieldJSON(c, "testinspectlink", "HostConfig.Links")
   101  
   102  	err := json.Unmarshal([]byte(links), &result)
   103  	c.Assert(err, checker.IsNil)
   104  
   105  	output := testutil.ConvertSliceOfStringsToMap(result)
   106  
   107  	c.Assert(output, checker.DeepEquals, expected)
   108  }
   109  
   110  func (s *DockerSuite) TestLinksInspectLinksStopped(c *check.C) {
   111  	testRequires(c, DaemonIsLinux)
   112  	var (
   113  		expected = map[string]struct{}{"/container1:/testinspectlink/alias1": {}, "/container2:/testinspectlink/alias2": {}}
   114  		result   []string
   115  	)
   116  	dockerCmd(c, "run", "-d", "--name", "container1", "busybox", "top")
   117  	dockerCmd(c, "run", "-d", "--name", "container2", "busybox", "top")
   118  	dockerCmd(c, "run", "-d", "--name", "testinspectlink", "--link", "container1:alias1", "--link", "container2:alias2", "busybox", "true")
   119  	links := inspectFieldJSON(c, "testinspectlink", "HostConfig.Links")
   120  
   121  	err := json.Unmarshal([]byte(links), &result)
   122  	c.Assert(err, checker.IsNil)
   123  
   124  	output := testutil.ConvertSliceOfStringsToMap(result)
   125  
   126  	c.Assert(output, checker.DeepEquals, expected)
   127  }
   128  
   129  func (s *DockerSuite) TestLinksNotStartedParentNotFail(c *check.C) {
   130  	testRequires(c, DaemonIsLinux)
   131  	dockerCmd(c, "create", "--name=first", "busybox", "top")
   132  	dockerCmd(c, "create", "--name=second", "--link=first:first", "busybox", "top")
   133  	dockerCmd(c, "start", "first")
   134  
   135  }
   136  
   137  func (s *DockerSuite) TestLinksHostsFilesInject(c *check.C) {
   138  	testRequires(c, DaemonIsLinux)
   139  	testRequires(c, SameHostDaemon, ExecSupport)
   140  
   141  	out, _ := dockerCmd(c, "run", "-itd", "--name", "one", "busybox", "top")
   142  	idOne := strings.TrimSpace(out)
   143  
   144  	out, _ = dockerCmd(c, "run", "-itd", "--name", "two", "--link", "one:onetwo", "busybox", "top")
   145  	idTwo := strings.TrimSpace(out)
   146  
   147  	c.Assert(waitRun(idTwo), checker.IsNil)
   148  
   149  	readContainerFileWithExec(c, idOne, "/etc/hosts")
   150  	contentTwo := readContainerFileWithExec(c, idTwo, "/etc/hosts")
   151  	// Host is not present in updated hosts file
   152  	c.Assert(string(contentTwo), checker.Contains, "onetwo")
   153  }
   154  
   155  func (s *DockerSuite) TestLinksUpdateOnRestart(c *check.C) {
   156  	testRequires(c, DaemonIsLinux)
   157  	testRequires(c, SameHostDaemon, ExecSupport)
   158  	dockerCmd(c, "run", "-d", "--name", "one", "busybox", "top")
   159  	out, _ := dockerCmd(c, "run", "-d", "--name", "two", "--link", "one:onetwo", "--link", "one:one", "busybox", "top")
   160  	id := strings.TrimSpace(string(out))
   161  
   162  	realIP := inspectField(c, "one", "NetworkSettings.Networks.bridge.IPAddress")
   163  	content := readContainerFileWithExec(c, id, "/etc/hosts")
   164  
   165  	getIP := func(hosts []byte, hostname string) string {
   166  		re := regexp.MustCompile(fmt.Sprintf(`(\S*)\t%s`, regexp.QuoteMeta(hostname)))
   167  		matches := re.FindSubmatch(hosts)
   168  		c.Assert(matches, checker.NotNil, check.Commentf("Hostname %s have no matches in hosts", hostname))
   169  		return string(matches[1])
   170  	}
   171  	ip := getIP(content, "one")
   172  	c.Assert(ip, checker.Equals, realIP)
   173  
   174  	ip = getIP(content, "onetwo")
   175  	c.Assert(ip, checker.Equals, realIP)
   176  
   177  	dockerCmd(c, "restart", "one")
   178  	realIP = inspectField(c, "one", "NetworkSettings.Networks.bridge.IPAddress")
   179  
   180  	content = readContainerFileWithExec(c, id, "/etc/hosts")
   181  	ip = getIP(content, "one")
   182  	c.Assert(ip, checker.Equals, realIP)
   183  
   184  	ip = getIP(content, "onetwo")
   185  	c.Assert(ip, checker.Equals, realIP)
   186  }
   187  
   188  func (s *DockerSuite) TestLinksEnvs(c *check.C) {
   189  	testRequires(c, DaemonIsLinux)
   190  	dockerCmd(c, "run", "-d", "-e", "e1=", "-e", "e2=v2", "-e", "e3=v3=v3", "--name=first", "busybox", "top")
   191  	out, _ := dockerCmd(c, "run", "--name=second", "--link=first:first", "busybox", "env")
   192  	c.Assert(out, checker.Contains, "FIRST_ENV_e1=\n")
   193  	c.Assert(out, checker.Contains, "FIRST_ENV_e2=v2")
   194  	c.Assert(out, checker.Contains, "FIRST_ENV_e3=v3=v3")
   195  }
   196  
   197  func (s *DockerSuite) TestLinkShortDefinition(c *check.C) {
   198  	testRequires(c, DaemonIsLinux)
   199  	out, _ := dockerCmd(c, "run", "-d", "--name", "shortlinkdef", "busybox", "top")
   200  
   201  	cid := strings.TrimSpace(out)
   202  	c.Assert(waitRun(cid), checker.IsNil)
   203  
   204  	out, _ = dockerCmd(c, "run", "-d", "--name", "link2", "--link", "shortlinkdef", "busybox", "top")
   205  
   206  	cid2 := strings.TrimSpace(out)
   207  	c.Assert(waitRun(cid2), checker.IsNil)
   208  
   209  	links := inspectFieldJSON(c, cid2, "HostConfig.Links")
   210  	c.Assert(links, checker.Equals, "[\"/shortlinkdef:/link2/shortlinkdef\"]")
   211  }
   212  
   213  func (s *DockerSuite) TestLinksNetworkHostContainer(c *check.C) {
   214  	testRequires(c, DaemonIsLinux, NotUserNamespace)
   215  	dockerCmd(c, "run", "-d", "--net", "host", "--name", "host_container", "busybox", "top")
   216  	out, _, err := dockerCmdWithError("run", "--name", "should_fail", "--link", "host_container:tester", "busybox", "true")
   217  
   218  	// Running container linking to a container with --net host should have failed
   219  	c.Assert(err, checker.NotNil, check.Commentf("out: %s", out))
   220  	// Running container linking to a container with --net host should have failed
   221  	c.Assert(out, checker.Contains, runconfig.ErrConflictHostNetworkAndLinks.Error())
   222  }
   223  
   224  func (s *DockerSuite) TestLinksEtcHostsRegularFile(c *check.C) {
   225  	testRequires(c, DaemonIsLinux, NotUserNamespace)
   226  	out, _ := dockerCmd(c, "run", "--net=host", "busybox", "ls", "-la", "/etc/hosts")
   227  	// /etc/hosts should be a regular file
   228  	c.Assert(out, checker.Matches, "^-.+\n")
   229  }
   230  
   231  func (s *DockerSuite) TestLinksMultipleWithSameName(c *check.C) {
   232  	testRequires(c, DaemonIsLinux)
   233  	dockerCmd(c, "run", "-d", "--name=upstream-a", "busybox", "top")
   234  	dockerCmd(c, "run", "-d", "--name=upstream-b", "busybox", "top")
   235  	dockerCmd(c, "run", "--link", "upstream-a:upstream", "--link", "upstream-b:upstream", "busybox", "sh", "-c", "ping -c 1 upstream")
   236  }