github.com/jwhonce/docker@v0.6.7-0.20190327063223-da823cf3a5a3/integration-cli/docker_cli_links_test.go (about)

     1  package main
     2  
     3  import (
     4  	"encoding/json"
     5  	"fmt"
     6  	"regexp"
     7  	"sort"
     8  	"strings"
     9  
    10  	"github.com/docker/docker/integration-cli/checker"
    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  	// note: convert the output to lowercase first as the error string
    32  	// capitalization was changed after API version 1.32
    33  	c.Assert(strings.ToLower(out), checker.Contains, "could not get container")
    34  }
    35  
    36  func (s *DockerSuite) TestLinksPingLinkedContainers(c *check.C) {
    37  	testRequires(c, DaemonIsLinux)
    38  	// Test with the three different ways of specifying the default network on Linux
    39  	testLinkPingOnNetwork(c, "")
    40  	testLinkPingOnNetwork(c, "default")
    41  	testLinkPingOnNetwork(c, "bridge")
    42  }
    43  
    44  func testLinkPingOnNetwork(c *check.C, network string) {
    45  	var postArgs []string
    46  	if network != "" {
    47  		postArgs = append(postArgs, []string{"--net", network}...)
    48  	}
    49  	postArgs = append(postArgs, []string{"busybox", "top"}...)
    50  	runArgs1 := append([]string{"run", "-d", "--name", "container1", "--hostname", "fred"}, postArgs...)
    51  	runArgs2 := append([]string{"run", "-d", "--name", "container2", "--hostname", "wilma"}, postArgs...)
    52  
    53  	// Run the two named containers
    54  	dockerCmd(c, runArgs1...)
    55  	dockerCmd(c, runArgs2...)
    56  
    57  	postArgs = []string{}
    58  	if network != "" {
    59  		postArgs = append(postArgs, []string{"--net", network}...)
    60  	}
    61  	postArgs = append(postArgs, []string{"busybox", "sh", "-c"}...)
    62  
    63  	// Format a run for a container which links to the other two
    64  	runArgs := append([]string{"run", "--rm", "--link", "container1:alias1", "--link", "container2:alias2"}, postArgs...)
    65  	pingCmd := "ping -c 1 %s -W 1 && ping -c 1 %s -W 1"
    66  
    67  	// test ping by alias, ping by name, and ping by hostname
    68  	// 1. Ping by alias
    69  	dockerCmd(c, append(runArgs, fmt.Sprintf(pingCmd, "alias1", "alias2"))...)
    70  	// 2. Ping by container name
    71  	dockerCmd(c, append(runArgs, fmt.Sprintf(pingCmd, "container1", "container2"))...)
    72  	// 3. Ping by hostname
    73  	dockerCmd(c, append(runArgs, fmt.Sprintf(pingCmd, "fred", "wilma"))...)
    74  
    75  	// Clean for next round
    76  	dockerCmd(c, "rm", "-f", "container1")
    77  	dockerCmd(c, "rm", "-f", "container2")
    78  }
    79  
    80  func (s *DockerSuite) TestLinksPingLinkedContainersAfterRename(c *check.C) {
    81  	testRequires(c, DaemonIsLinux)
    82  	out, _ := dockerCmd(c, "run", "-d", "--name", "container1", "busybox", "top")
    83  	idA := strings.TrimSpace(out)
    84  	out, _ = dockerCmd(c, "run", "-d", "--name", "container2", "busybox", "top")
    85  	idB := strings.TrimSpace(out)
    86  	dockerCmd(c, "rename", "container1", "container_new")
    87  	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")
    88  	dockerCmd(c, "kill", idA)
    89  	dockerCmd(c, "kill", idB)
    90  
    91  }
    92  
    93  func (s *DockerSuite) TestLinksInspectLinksStarted(c *check.C) {
    94  	testRequires(c, DaemonIsLinux)
    95  	dockerCmd(c, "run", "-d", "--name", "container1", "busybox", "top")
    96  	dockerCmd(c, "run", "-d", "--name", "container2", "busybox", "top")
    97  	dockerCmd(c, "run", "-d", "--name", "testinspectlink", "--link", "container1:alias1", "--link", "container2:alias2", "busybox", "top")
    98  	links := inspectFieldJSON(c, "testinspectlink", "HostConfig.Links")
    99  
   100  	var result []string
   101  	err := json.Unmarshal([]byte(links), &result)
   102  	c.Assert(err, checker.IsNil)
   103  
   104  	var expected = []string{
   105  		"/container1:/testinspectlink/alias1",
   106  		"/container2:/testinspectlink/alias2",
   107  	}
   108  	sort.Strings(result)
   109  	c.Assert(result, checker.DeepEquals, expected)
   110  }
   111  
   112  func (s *DockerSuite) TestLinksInspectLinksStopped(c *check.C) {
   113  	testRequires(c, DaemonIsLinux)
   114  
   115  	dockerCmd(c, "run", "-d", "--name", "container1", "busybox", "top")
   116  	dockerCmd(c, "run", "-d", "--name", "container2", "busybox", "top")
   117  	dockerCmd(c, "run", "-d", "--name", "testinspectlink", "--link", "container1:alias1", "--link", "container2:alias2", "busybox", "true")
   118  	links := inspectFieldJSON(c, "testinspectlink", "HostConfig.Links")
   119  
   120  	var result []string
   121  	err := json.Unmarshal([]byte(links), &result)
   122  	c.Assert(err, checker.IsNil)
   123  
   124  	var expected = []string{
   125  		"/container1:/testinspectlink/alias1",
   126  		"/container2:/testinspectlink/alias2",
   127  	}
   128  	sort.Strings(result)
   129  	c.Assert(result, checker.DeepEquals, expected)
   130  }
   131  
   132  func (s *DockerSuite) TestLinksNotStartedParentNotFail(c *check.C) {
   133  	testRequires(c, DaemonIsLinux)
   134  	dockerCmd(c, "create", "--name=first", "busybox", "top")
   135  	dockerCmd(c, "create", "--name=second", "--link=first:first", "busybox", "top")
   136  	dockerCmd(c, "start", "first")
   137  
   138  }
   139  
   140  func (s *DockerSuite) TestLinksHostsFilesInject(c *check.C) {
   141  	testRequires(c, DaemonIsLinux)
   142  	testRequires(c, testEnv.IsLocalDaemon, ExecSupport)
   143  
   144  	out, _ := dockerCmd(c, "run", "-itd", "--name", "one", "busybox", "top")
   145  	idOne := strings.TrimSpace(out)
   146  
   147  	out, _ = dockerCmd(c, "run", "-itd", "--name", "two", "--link", "one:onetwo", "busybox", "top")
   148  	idTwo := strings.TrimSpace(out)
   149  
   150  	c.Assert(waitRun(idTwo), checker.IsNil)
   151  
   152  	readContainerFileWithExec(c, idOne, "/etc/hosts")
   153  	contentTwo := readContainerFileWithExec(c, idTwo, "/etc/hosts")
   154  	// Host is not present in updated hosts file
   155  	c.Assert(string(contentTwo), checker.Contains, "onetwo")
   156  }
   157  
   158  func (s *DockerSuite) TestLinksUpdateOnRestart(c *check.C) {
   159  	testRequires(c, DaemonIsLinux)
   160  	testRequires(c, testEnv.IsLocalDaemon, ExecSupport)
   161  	dockerCmd(c, "run", "-d", "--name", "one", "busybox", "top")
   162  	out, _ := dockerCmd(c, "run", "-d", "--name", "two", "--link", "one:onetwo", "--link", "one:one", "busybox", "top")
   163  	id := strings.TrimSpace(string(out))
   164  
   165  	realIP := inspectField(c, "one", "NetworkSettings.Networks.bridge.IPAddress")
   166  	content := readContainerFileWithExec(c, id, "/etc/hosts")
   167  
   168  	getIP := func(hosts []byte, hostname string) string {
   169  		re := regexp.MustCompile(fmt.Sprintf(`(\S*)\t%s`, regexp.QuoteMeta(hostname)))
   170  		matches := re.FindSubmatch(hosts)
   171  		c.Assert(matches, checker.NotNil, check.Commentf("Hostname %s have no matches in hosts", hostname))
   172  		return string(matches[1])
   173  	}
   174  	ip := getIP(content, "one")
   175  	c.Assert(ip, checker.Equals, realIP)
   176  
   177  	ip = getIP(content, "onetwo")
   178  	c.Assert(ip, checker.Equals, realIP)
   179  
   180  	dockerCmd(c, "restart", "one")
   181  	realIP = inspectField(c, "one", "NetworkSettings.Networks.bridge.IPAddress")
   182  
   183  	content = readContainerFileWithExec(c, id, "/etc/hosts")
   184  	ip = getIP(content, "one")
   185  	c.Assert(ip, checker.Equals, realIP)
   186  
   187  	ip = getIP(content, "onetwo")
   188  	c.Assert(ip, checker.Equals, realIP)
   189  }
   190  
   191  func (s *DockerSuite) TestLinksEnvs(c *check.C) {
   192  	testRequires(c, DaemonIsLinux)
   193  	dockerCmd(c, "run", "-d", "-e", "e1=", "-e", "e2=v2", "-e", "e3=v3=v3", "--name=first", "busybox", "top")
   194  	out, _ := dockerCmd(c, "run", "--name=second", "--link=first:first", "busybox", "env")
   195  	c.Assert(out, checker.Contains, "FIRST_ENV_e1=\n")
   196  	c.Assert(out, checker.Contains, "FIRST_ENV_e2=v2")
   197  	c.Assert(out, checker.Contains, "FIRST_ENV_e3=v3=v3")
   198  }
   199  
   200  func (s *DockerSuite) TestLinkShortDefinition(c *check.C) {
   201  	testRequires(c, DaemonIsLinux)
   202  	out, _ := dockerCmd(c, "run", "-d", "--name", "shortlinkdef", "busybox", "top")
   203  
   204  	cid := strings.TrimSpace(out)
   205  	c.Assert(waitRun(cid), checker.IsNil)
   206  
   207  	out, _ = dockerCmd(c, "run", "-d", "--name", "link2", "--link", "shortlinkdef", "busybox", "top")
   208  
   209  	cid2 := strings.TrimSpace(out)
   210  	c.Assert(waitRun(cid2), checker.IsNil)
   211  
   212  	links := inspectFieldJSON(c, cid2, "HostConfig.Links")
   213  	c.Assert(links, checker.Equals, "[\"/shortlinkdef:/link2/shortlinkdef\"]")
   214  }
   215  
   216  func (s *DockerSuite) TestLinksNetworkHostContainer(c *check.C) {
   217  	testRequires(c, DaemonIsLinux, NotUserNamespace)
   218  	dockerCmd(c, "run", "-d", "--net", "host", "--name", "host_container", "busybox", "top")
   219  	out, _, err := dockerCmdWithError("run", "--name", "should_fail", "--link", "host_container:tester", "busybox", "true")
   220  
   221  	// Running container linking to a container with --net host should have failed
   222  	c.Assert(err, checker.NotNil, check.Commentf("out: %s", out))
   223  	// Running container linking to a container with --net host should have failed
   224  	c.Assert(out, checker.Contains, runconfig.ErrConflictHostNetworkAndLinks.Error())
   225  }
   226  
   227  func (s *DockerSuite) TestLinksEtcHostsRegularFile(c *check.C) {
   228  	testRequires(c, DaemonIsLinux, NotUserNamespace)
   229  	out, _ := dockerCmd(c, "run", "--net=host", "busybox", "ls", "-la", "/etc/hosts")
   230  	// /etc/hosts should be a regular file
   231  	c.Assert(out, checker.Matches, "^-.+\n")
   232  }
   233  
   234  func (s *DockerSuite) TestLinksMultipleWithSameName(c *check.C) {
   235  	testRequires(c, DaemonIsLinux)
   236  	dockerCmd(c, "run", "-d", "--name=upstream-a", "busybox", "top")
   237  	dockerCmd(c, "run", "-d", "--name=upstream-b", "busybox", "top")
   238  	dockerCmd(c, "run", "--link", "upstream-a:upstream", "--link", "upstream-b:upstream", "busybox", "sh", "-c", "ping -c 1 upstream")
   239  }