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Merge pull request ovn-kubernetes#1084 from girishmg/readiness
add readiness probes for OVN/OVS daemons
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| package app | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io/ioutil" | ||
| "strings" | ||
|
|
||
| "github.com/ovn-org/ovn-kubernetes/go-controller/pkg/util" | ||
| "github.com/urfave/cli" | ||
| kexec "k8s.io/utils/exec" | ||
| ) | ||
|
|
||
| type readinessFunc func(string) error | ||
|
|
||
| var callbacks = map[string]readinessFunc{ | ||
| "ovn-controller": ovnControllerReadiness, | ||
| "ovnnb-db": ovnNBDBReadiness, | ||
| "ovnsb-db": ovnSBDBReadiness, | ||
| "ovn-northd": ovnNorthdReadiness, | ||
| "ovn-nbctld": ovnNbCtldReadiness, | ||
| "ovs-daemons": ovsDaemonsReadiness, | ||
| } | ||
|
|
||
| func ovnControllerReadiness(target string) error { | ||
| // Check if ovn-controller is connected to OVN SB | ||
| output, _, err := util.RunOVSAppctlWithTimeout(5, "-t", target, "connection-status") | ||
| if err != nil { | ||
| return fmt.Errorf("failed getting connection status of %q: (%v)", target, err) | ||
| } else if output != "connected" { | ||
| return fmt.Errorf("%q is not connected to OVN SB database, status: (%s)", target, output) | ||
| } | ||
|
|
||
| // Ensure that the ovs-vswitchd and ovsdb-server processes that ovn-controller | ||
| // dependent on are running and you need to use ovs-appctl via the unix control path | ||
| ovsdbPid, err := ioutil.ReadFile("/var/run/openvswitch/ovsdb-server.pid") | ||
| if err != nil { | ||
| return fmt.Errorf("failed to get pid for osvdb-server process: %v", err) | ||
| } | ||
| ctlFile := fmt.Sprintf("/var/run/openvswitch/ovsdb-server.%s.ctl", strings.Trim(string(ovsdbPid), " \n")) | ||
| _, _, err = util.RunOVSAppctlWithTimeout(5, "-t", ctlFile, "ovsdb-server/list-dbs") | ||
| if err != nil { | ||
| return fmt.Errorf("failed retrieving list of databases from ovsdb-server: %v", err) | ||
| } | ||
|
|
||
| ovsPid, err := ioutil.ReadFile("/var/run/openvswitch/ovs-vswitchd.pid") | ||
| if err != nil { | ||
| return fmt.Errorf("failed to get pid for ovs-vswitchd process: %v", err) | ||
| } | ||
| ctlFile = fmt.Sprintf("/var/run/openvswitch/ovs-vswitchd.%s.ctl", strings.Trim(string(ovsPid), " \n")) | ||
| _, _, err = util.RunOVSAppctlWithTimeout(5, "-t", ctlFile, "ofproto/list") | ||
| if err != nil { | ||
| return fmt.Errorf("failed to retrieve ofproto instances from ovs-vswitchd: %v", err) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func ovnNBDBReadiness(target string) error { | ||
| var err error | ||
| var output string | ||
|
|
||
| // 1. Check if the OVN NB process is running. | ||
| // 2. Check if OVN NB process is listening on the port that it is supposed to | ||
| _, _, err = util.RunOVNAppctlWithTimeout(5, "-t", fmt.Sprintf("%s/ovnnb_db.ctl", util.GetOvnRunDir()), | ||
| "ovsdb-server/list-dbs") | ||
| if err != nil { | ||
| return fmt.Errorf("failed connecting to %q: (%v)", target, err) | ||
| } | ||
| output, _, err = util.RunOVNNbctlWithTimeout(5, "--data=bare", "--no-heading", "--columns=target", | ||
| "find", "connection", "target!=_") | ||
| if err != nil { | ||
| return fmt.Errorf("%s is not ready: (%v)", target, err) | ||
| } | ||
|
|
||
| if strings.HasPrefix(output, "ptcp") || strings.HasPrefix(output, "pssl") { | ||
| return nil | ||
| } | ||
| return fmt.Errorf("%s is not setup for passive connection: %v", target, output) | ||
| } | ||
|
|
||
| func ovnSBDBReadiness(target string) error { | ||
| var err error | ||
| var output string | ||
|
|
||
| // 1. Check if the OVN SB process is running. | ||
| // 2. Check if OVN SB process is listening on the port that it is supposed to | ||
| _, _, err = util.RunOVNAppctlWithTimeout(5, "-t", fmt.Sprintf("%s/ovnsb_db.ctl", util.GetOvnRunDir()), | ||
| "ovsdb-server/list-dbs") | ||
| if err != nil { | ||
| return fmt.Errorf("failed connecting to %q: (%v)", target, err) | ||
| } | ||
| output, _, err = util.RunOVNSbctlWithTimeout(5, "--data=bare", "--no-heading", "--columns=target", | ||
| "find", "connection", "target!=_") | ||
| if err != nil { | ||
| return fmt.Errorf("%s is not ready: (%v)", target, err) | ||
| } | ||
|
|
||
| if strings.HasPrefix(output, "ptcp") || strings.HasPrefix(output, "pssl") { | ||
| return nil | ||
| } | ||
| return fmt.Errorf("%s is not setup for passive connection: %v", target, output) | ||
| } | ||
|
|
||
| func ovnNorthdReadiness(target string) error { | ||
| _, _, err := util.RunOVNAppctlWithTimeout(5, "-t", target, "version") | ||
| if err != nil { | ||
| return fmt.Errorf("failed to get version from %s: (%v)", target, err) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func ovnNbCtldReadiness(target string) error { | ||
| _, _, err := util.RunOVNAppctlWithTimeout(5, "-t", "ovn-nbctl", "version") | ||
| if err != nil { | ||
| return fmt.Errorf("failed to get version from %s: (%v)", target, err) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func ovsDaemonsReadiness(target string) error { | ||
| _, _, err := util.RunOVSAppctlWithTimeout(5, "-t", "ovsdb-server", "ovsdb-server/list-dbs") | ||
| if err != nil { | ||
| return fmt.Errorf("failed retrieving list of databases from ovsdb-server: %v", err) | ||
| } | ||
| _, _, err = util.RunOVSAppctlWithTimeout(5, "-t", "ovs-vswitchd", "ofproto/list") | ||
| if err != nil { | ||
| return fmt.Errorf("failed to retrieve ofproto instances from ovs-vswitchd: %v", err) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // ReadinessProbeCommand runs readiness probes against various targets | ||
| var ReadinessProbeCommand = cli.Command{ | ||
| Name: "readiness-probe", | ||
| Usage: "check readiness of the specified target daemon", | ||
| Flags: []cli.Flag{ | ||
| cli.StringFlag{ | ||
| Name: "target, t", | ||
| Usage: "target daemon to check for readiness", | ||
| }, | ||
| }, | ||
| Action: func(ctx *cli.Context) error { | ||
| target := ctx.String("target") | ||
| if err := util.SetExec(kexec.New()); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return callbacks[target](target) | ||
| }, | ||
| } |
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