healthcheck: add support at the load-balancers of services level
Co-authored-by: Dmitry Sharshakov <d3dx12.xx@gmail.com> Co-authored-by: Julien Salleyron <julien.salleyron@gmail.com> Co-authored-by: Jean-Baptiste Doumenjou <925513+jbdoumenjou@users.noreply.github.com> Co-authored-by: Romain <rtribotte@users.noreply.github.com> Co-authored-by: Tom Moulard <tom.moulard@traefik.io>
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mpl
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28 changed files with 1196 additions and 120 deletions
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@ -2,6 +2,8 @@ package integration
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"net/http"
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"os"
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"time"
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@ -16,6 +18,8 @@ type HealthCheckSuite struct {
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BaseSuite
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whoami1IP string
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whoami2IP string
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whoami3IP string
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whoami4IP string
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}
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func (s *HealthCheckSuite) SetUpSuite(c *check.C) {
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@ -24,6 +28,8 @@ func (s *HealthCheckSuite) SetUpSuite(c *check.C) {
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s.whoami1IP = s.composeProject.Container(c, "whoami1").NetworkSettings.IPAddress
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s.whoami2IP = s.composeProject.Container(c, "whoami2").NetworkSettings.IPAddress
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s.whoami3IP = s.composeProject.Container(c, "whoami3").NetworkSettings.IPAddress
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s.whoami4IP = s.composeProject.Container(c, "whoami4").NetworkSettings.IPAddress
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}
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func (s *HealthCheckSuite) TestSimpleConfiguration(c *check.C) {
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@ -271,3 +277,265 @@ func (s *HealthCheckSuite) TestMultipleRoutersOnSameService(c *check.C) {
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err = try.Request(healthReqWeb2, 3*time.Second, try.StatusCodeIs(http.StatusOK))
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c.Assert(err, checker.IsNil)
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}
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func (s *HealthCheckSuite) TestPropagate(c *check.C) {
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file := s.adaptFile(c, "fixtures/healthcheck/propagate.toml", struct {
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Server1 string
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Server2 string
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Server3 string
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Server4 string
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}{s.whoami1IP, s.whoami2IP, s.whoami3IP, s.whoami4IP})
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defer os.Remove(file)
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cmd, display := s.traefikCmd(withConfigFile(file))
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defer display(c)
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err := cmd.Start()
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c.Assert(err, checker.IsNil)
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defer s.killCmd(cmd)
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// wait for traefik
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err = try.GetRequest("http://127.0.0.1:8080/api/rawdata", 60*time.Second, try.BodyContains("Host(`root.localhost`)"))
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c.Assert(err, checker.IsNil)
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rootReq, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:8000", nil)
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c.Assert(err, checker.IsNil)
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rootReq.Host = "root.localhost"
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err = try.Request(rootReq, 500*time.Millisecond, try.StatusCodeIs(http.StatusOK))
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c.Assert(err, checker.IsNil)
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// Bring whoami1 and whoami3 down
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client := http.Client{
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Timeout: 10 * time.Second,
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}
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whoamiHosts := []string{s.whoami1IP, s.whoami3IP}
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for _, whoami := range whoamiHosts {
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statusInternalServerErrorReq, err := http.NewRequest(http.MethodPost, "http://"+whoami+"/health", bytes.NewBuffer([]byte("500")))
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c.Assert(err, checker.IsNil)
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_, err = client.Do(statusInternalServerErrorReq)
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c.Assert(err, checker.IsNil)
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}
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try.Sleep(time.Second)
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// Verify load-balancing on root still works, and that we're getting wsp2, wsp4, wsp2, wsp4, etc.
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var want string
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for i := 0; i < 4; i++ {
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if i%2 == 0 {
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want = `IP: ` + s.whoami4IP
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} else {
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want = `IP: ` + s.whoami2IP
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}
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resp, err := client.Do(rootReq)
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c.Assert(err, checker.IsNil)
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body, err := ioutil.ReadAll(resp.Body)
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c.Assert(err, checker.IsNil)
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c.Assert(string(body), checker.Contains, want)
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}
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fooReq, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:8000", nil)
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c.Assert(err, checker.IsNil)
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fooReq.Host = "foo.localhost"
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// Verify load-balancing on foo still works, and that we're getting wsp2, wsp2, wsp2, wsp2, etc.
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want = `IP: ` + s.whoami2IP
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for i := 0; i < 4; i++ {
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resp, err := client.Do(fooReq)
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c.Assert(err, checker.IsNil)
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body, err := ioutil.ReadAll(resp.Body)
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c.Assert(err, checker.IsNil)
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c.Assert(string(body), checker.Contains, want)
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}
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barReq, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:8000", nil)
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c.Assert(err, checker.IsNil)
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barReq.Host = "bar.localhost"
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// Verify load-balancing on bar still works, and that we're getting wsp2, wsp2, wsp2, wsp2, etc.
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want = `IP: ` + s.whoami2IP
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for i := 0; i < 4; i++ {
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resp, err := client.Do(barReq)
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c.Assert(err, checker.IsNil)
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body, err := ioutil.ReadAll(resp.Body)
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c.Assert(err, checker.IsNil)
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c.Assert(string(body), checker.Contains, want)
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}
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// Bring whoami2 and whoami4 down
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whoamiHosts = []string{s.whoami2IP, s.whoami4IP}
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for _, whoami := range whoamiHosts {
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statusInternalServerErrorReq, err := http.NewRequest(http.MethodPost, "http://"+whoami+"/health", bytes.NewBuffer([]byte("500")))
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c.Assert(err, checker.IsNil)
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_, err = client.Do(statusInternalServerErrorReq)
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c.Assert(err, checker.IsNil)
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}
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try.Sleep(time.Second)
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// Verify that everything is down, and that we get 503s everywhere.
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for i := 0; i < 2; i++ {
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resp, err := client.Do(rootReq)
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c.Assert(err, checker.IsNil)
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c.Assert(resp.StatusCode, checker.Equals, http.StatusServiceUnavailable)
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resp, err = client.Do(fooReq)
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c.Assert(err, checker.IsNil)
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c.Assert(resp.StatusCode, checker.Equals, http.StatusServiceUnavailable)
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resp, err = client.Do(barReq)
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c.Assert(err, checker.IsNil)
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c.Assert(resp.StatusCode, checker.Equals, http.StatusServiceUnavailable)
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}
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// Bring everything back up.
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whoamiHosts = []string{s.whoami1IP, s.whoami2IP, s.whoami3IP, s.whoami4IP}
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for _, whoami := range whoamiHosts {
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statusOKReq, err := http.NewRequest(http.MethodPost, "http://"+whoami+"/health", bytes.NewBuffer([]byte("200")))
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c.Assert(err, checker.IsNil)
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_, err = client.Do(statusOKReq)
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c.Assert(err, checker.IsNil)
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}
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try.Sleep(time.Second)
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// Verify everything is up on root router.
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wantIPs := []string{s.whoami3IP, s.whoami1IP, s.whoami4IP, s.whoami2IP}
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for i := 0; i < 4; i++ {
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want := `IP: ` + wantIPs[i]
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resp, err := client.Do(rootReq)
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c.Assert(err, checker.IsNil)
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body, err := ioutil.ReadAll(resp.Body)
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c.Assert(err, checker.IsNil)
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c.Assert(string(body), checker.Contains, want)
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}
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// Verify everything is up on foo router.
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wantIPs = []string{s.whoami1IP, s.whoami1IP, s.whoami3IP, s.whoami2IP}
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for i := 0; i < 4; i++ {
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want := `IP: ` + wantIPs[i]
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resp, err := client.Do(fooReq)
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c.Assert(err, checker.IsNil)
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body, err := ioutil.ReadAll(resp.Body)
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c.Assert(err, checker.IsNil)
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c.Assert(string(body), checker.Contains, want)
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}
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// Verify everything is up on bar router.
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wantIPs = []string{s.whoami1IP, s.whoami1IP, s.whoami3IP, s.whoami2IP}
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for i := 0; i < 4; i++ {
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want := `IP: ` + wantIPs[i]
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resp, err := client.Do(barReq)
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c.Assert(err, checker.IsNil)
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body, err := ioutil.ReadAll(resp.Body)
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c.Assert(err, checker.IsNil)
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c.Assert(string(body), checker.Contains, want)
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}
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}
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func (s *HealthCheckSuite) TestPropagateNoHealthCheck(c *check.C) {
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file := s.adaptFile(c, "fixtures/healthcheck/propagate_no_healthcheck.toml", struct {
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Server1 string
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}{s.whoami1IP})
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defer os.Remove(file)
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cmd, display := s.traefikCmd(withConfigFile(file))
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defer display(c)
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err := cmd.Start()
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c.Assert(err, checker.IsNil)
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defer s.killCmd(cmd)
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// wait for traefik
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err = try.GetRequest("http://127.0.0.1:8080/api/rawdata", 60*time.Second, try.BodyContains("Host(`noop.localhost`)"), try.BodyNotContains("Host(`root.localhost`)"))
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c.Assert(err, checker.IsNil)
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rootReq, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:8000", nil)
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c.Assert(err, checker.IsNil)
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rootReq.Host = "root.localhost"
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err = try.Request(rootReq, 500*time.Millisecond, try.StatusCodeIs(http.StatusNotFound))
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c.Assert(err, checker.IsNil)
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}
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func (s *HealthCheckSuite) TestPropagateReload(c *check.C) {
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// Setup a WSP service without the healthcheck enabled (wsp-service1)
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withoutHealthCheck := s.adaptFile(c, "fixtures/healthcheck/reload_without_healthcheck.toml", struct {
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Server1 string
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Server2 string
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}{s.whoami1IP, s.whoami2IP})
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defer os.Remove(withoutHealthCheck)
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withHealthCheck := s.adaptFile(c, "fixtures/healthcheck/reload_with_healthcheck.toml", struct {
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Server1 string
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Server2 string
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}{s.whoami1IP, s.whoami2IP})
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defer os.Remove(withHealthCheck)
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cmd, display := s.traefikCmd(withConfigFile(withoutHealthCheck))
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defer display(c)
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err := cmd.Start()
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c.Assert(err, checker.IsNil)
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defer s.killCmd(cmd)
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// wait for traefik
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err = try.GetRequest("http://127.0.0.1:8080/api/rawdata", 60*time.Second, try.BodyContains("Host(`root.localhost`)"))
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c.Assert(err, checker.IsNil)
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// Allow one of the underlying services on it to fail all servers HC (whoami2)
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client := http.Client{
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Timeout: 10 * time.Second,
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}
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statusOKReq, err := http.NewRequest(http.MethodPost, "http://"+s.whoami2IP+"/health", bytes.NewBuffer([]byte("500")))
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c.Assert(err, checker.IsNil)
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_, err = client.Do(statusOKReq)
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c.Assert(err, checker.IsNil)
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rootReq, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:8000", nil)
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c.Assert(err, checker.IsNil)
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rootReq.Host = "root.localhost"
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// Check the failed service (whoami2) is getting requests, but answer 500
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err = try.Request(rootReq, 500*time.Millisecond, try.StatusCodeIs(http.StatusServiceUnavailable))
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c.Assert(err, checker.IsNil)
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// Enable the healthcheck on the root WSP (wsp-service1) and let Traefik reload the config
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fr1, err := os.OpenFile(withoutHealthCheck, os.O_APPEND|os.O_WRONLY, 0o644)
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c.Assert(fr1, checker.NotNil)
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c.Assert(err, checker.IsNil)
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err = fr1.Truncate(0)
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c.Assert(err, checker.IsNil)
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fr2, err := os.ReadFile(withHealthCheck)
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c.Assert(err, checker.IsNil)
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_, err = fmt.Fprint(fr1, string(fr2))
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c.Assert(err, checker.IsNil)
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err = fr1.Close()
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c.Assert(err, checker.IsNil)
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try.Sleep(1 * time.Second)
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// Check the failed service (whoami2) is not getting requests
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wantIPs := []string{s.whoami1IP, s.whoami1IP, s.whoami1IP, s.whoami1IP}
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for _, ip := range wantIPs {
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want := "IP: " + ip
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resp, err := client.Do(rootReq)
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c.Assert(err, checker.IsNil)
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body, err := ioutil.ReadAll(resp.Body)
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c.Assert(err, checker.IsNil)
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c.Assert(string(body), checker.Contains, want)
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}
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}
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