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ovn_db.go
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ovn_db.go
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package metrics
import (
"context"
"fmt"
"os"
"strconv"
"strings"
"time"
"github.com/ovn-org/ovn-kubernetes/go-controller/pkg/util"
"github.com/prometheus/client_golang/prometheus"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/kubernetes"
"k8s.io/klog/v2"
)
var metricOVNDBSessions = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "jsonrpc_server_sessions",
Help: "Active number of JSON RPC Server sessions to the DB"},
[]string{
"db_name",
},
)
var metricOVNDBMonitor = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "ovsdb_monitors",
Help: "Number of OVSDB Monitors on the server"},
[]string{
"db_name",
},
)
var metricDBSize = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "db_size_bytes",
Help: "The size of the database file associated with the OVN DB component."},
[]string{
"db_name",
},
)
// ClusterStatus metrics
var metricDBClusterCID = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_id",
Help: "A metric with a constant '1' value labeled by database name and cluster uuid"},
[]string{
"db_name",
"cluster_id",
},
)
var metricDBClusterSID = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_server_id",
Help: "A metric with a constant '1' value labeled by database name, cluster uuid " +
"and server uuid"},
[]string{
"db_name",
"cluster_id",
"server_id",
},
)
var metricDBClusterServerStatus = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_server_status",
Help: "A metric with a constant '1' value labeled by database name, cluster uuid, server uuid " +
"server status"},
[]string{
"db_name",
"cluster_id",
"server_id",
"server_status",
},
)
var metricDBClusterServerRole = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_server_role",
Help: "A metric with a constant '1' value labeled by database name, cluster uuid, server uuid " +
"and server role"},
[]string{
"db_name",
"cluster_id",
"server_id",
"server_role",
},
)
var metricDBClusterTerm = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_term",
Help: "A metric that returns the current election term value labeled by database name, cluster uuid, and " +
"server uuid"},
[]string{
"db_name",
"cluster_id",
"server_id",
},
)
var metricDBClusterServerVote = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_server_vote",
Help: "A metric with a constant '1' value labeled by database name, cluster uuid, server uuid " +
"and server vote"},
[]string{
"db_name",
"cluster_id",
"server_id",
"server_vote",
},
)
var metricDBClusterElectionTimer = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_election_timer",
Help: "A metric that returns the current election timer value labeled by database name, cluster uuid, " +
"and server uuid"},
[]string{
"db_name",
"cluster_id",
"server_id",
},
)
var metricDBClusterLogIndexStart = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_log_index_start",
Help: "A metric that returns the log entry index start value labeled by database name, cluster uuid, " +
"and server uuid"},
[]string{
"db_name",
"cluster_id",
"server_id",
},
)
var metricDBClusterLogIndexNext = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_log_index_next",
Help: "A metric that returns the log entry index next value labeled by database name, cluster uuid, " +
"and server uuid"},
[]string{
"db_name",
"cluster_id",
"server_id",
},
)
var metricDBClusterLogNotCommitted = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_log_not_committed",
Help: "A metric that returns the number of log entries not committed labeled by database name, cluster uuid, " +
"and server uuid"},
[]string{
"db_name",
"cluster_id",
"server_id",
},
)
var metricDBClusterLogNotApplied = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_log_not_applied",
Help: "A metric that returns the number of log entries not applied labeled by database name, cluster uuid, " +
"and server uuid"},
[]string{
"db_name",
"cluster_id",
"server_id",
},
)
var metricDBClusterConnIn = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_inbound_connections_total",
Help: "A metric that returns the total number of inbound connections to the server labeled by " +
"database name, cluster uuid, and server uuid"},
[]string{
"db_name",
"cluster_id",
"server_id",
},
)
var metricDBClusterConnOut = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_outbound_connections_total",
Help: "A metric that returns the total number of outbound connections from the server labeled by " +
"database name, cluster uuid, and server uuid"},
[]string{
"db_name",
"cluster_id",
"server_id",
},
)
var metricDBClusterConnInErr = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_inbound_connections_error_total",
Help: "A metric that returns the total number of failed inbound connections to the server labeled by " +
" database name, cluster uuid, and server uuid"},
[]string{
"db_name",
"cluster_id",
"server_id",
},
)
var metricDBClusterConnOutErr = prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "cluster_outbound_connections_error_total",
Help: "A metric that returns the total number of failed outbound connections from the server labeled by " +
"database name, cluster uuid, and server uuid"},
[]string{
"db_name",
"cluster_id",
"server_id",
},
)
func ovnDBSizeMetricsUpdater(dbProps *util.OvsDbProperties) {
if size, err := getOvnDBSizeViaPath(dbProps); err != nil {
klog.Errorf("Failed to update OVN DB size metric: %v", err)
} else {
metricDBSize.WithLabelValues(dbProps.DbName).Set(float64(size))
}
}
func resetOvnDbSizeMetric() {
metricDBSize.Reset()
}
// isOvnDBFoundViaPath attempts to find the OVN DBs, return false if not found.
func isOvnDBFoundViaPath(dbProperties []*util.OvsDbProperties) bool {
enabled := true
for _, dbProperty := range dbProperties {
if _, err := getOvnDBSizeViaPath(dbProperty); err != nil {
enabled = false
break
}
}
return enabled
}
func getOvnDBSizeViaPath(dbProperties *util.OvsDbProperties) (int64, error) {
fileInfo, err := os.Stat(dbProperties.DbAlias)
if err != nil {
return 0, fmt.Errorf("failed to find OVN DB database %s at path %s: %v",
dbProperties.DbName, dbProperties.DbAlias, err)
}
return fileInfo.Size(), nil
}
func ovnDBMemoryMetricsUpdater(dbProperties *util.OvsDbProperties) {
var stdout, stderr string
var err error
stdout, stderr, err = dbProperties.AppCtl(5, "memory/show")
if err != nil {
klog.Errorf("Failed retrieving memory/show output for %q, stderr: %s, err: (%v)",
strings.ToUpper(dbProperties.DbName), stderr, err)
return
}
for _, kvPair := range strings.Fields(stdout) {
if strings.HasPrefix(kvPair, "monitors:") {
// kvPair will be of the form monitors:2
fields := strings.Split(kvPair, ":")
if value, err := strconv.ParseFloat(fields[1], 64); err == nil {
metricOVNDBMonitor.WithLabelValues(dbProperties.DbName).Set(value)
} else {
klog.Errorf("Failed to parse the monitor's value %s to float64: err(%v)",
fields[1], err)
}
} else if strings.HasPrefix(kvPair, "sessions:") {
// kvPair will be of the form sessions:2
fields := strings.Split(kvPair, ":")
if value, err := strconv.ParseFloat(fields[1], 64); err == nil {
metricOVNDBSessions.WithLabelValues(dbProperties.DbName).Set(value)
} else {
klog.Errorf("Failed to parse the sessions' value %s to float64: err(%v)",
fields[1], err)
}
}
}
}
func resetOvnDbMemoryMetrics() {
metricOVNDBMonitor.Reset()
metricOVNDBSessions.Reset()
}
var (
ovnDbVersion string
nbDbSchemaVersion string
sbDbSchemaVersion string
)
func getNBDBSockPath() (string, error) {
paths := []string{"/var/run/openvswitch/", "/var/run/ovn/"}
for _, basePath := range paths {
if _, err := os.Stat(basePath + "ovnnb_db.sock"); err == nil {
klog.Infof("ovnnb_db.sock found at %s", basePath)
return basePath, nil
} else {
klog.Infof("%sovnnb_db.sock getting info failed: %s", basePath, err)
}
}
return "", fmt.Errorf("ovn db sock files weren't found in %s", strings.Join(paths, " or "))
}
func getOvnDbVersionInfo() {
stdout, _, err := util.RunOVNNBAppCtl("version")
if err == nil && strings.HasPrefix(stdout, "ovsdb-server (Open vSwitch) ") {
ovnDbVersion = strings.Fields(stdout)[3]
}
basePath, err := getNBDBSockPath()
if err != nil {
klog.Errorf("OVN db schema versions can't be fetched: %s", err)
return
}
sockPath := "unix:" + basePath + "ovnnb_db.sock"
stdout, _, err = util.RunOVSDBClient("get-schema-version", sockPath, "OVN_Northbound")
if err == nil {
nbDbSchemaVersion = strings.TrimSpace(stdout)
} else {
klog.Errorf("OVN nbdb schema version can't be fetched: %s", err)
}
sockPath = "unix:" + basePath + "ovnsb_db.sock"
stdout, _, err = util.RunOVSDBClient("get-schema-version", sockPath, "OVN_Southbound")
if err == nil {
sbDbSchemaVersion = strings.TrimSpace(stdout)
} else {
klog.Errorf("OVN sbdb schema version can't be fetched: %s", err)
}
}
func RegisterOvnDBMetrics(clientset kubernetes.Interface, k8sNodeName string, stopChan <-chan struct{}) {
err := wait.PollUntilContextTimeout(context.Background(), 1*time.Second, 300*time.Second, true, func(ctx context.Context) (bool, error) {
return checkPodRunsOnGivenNode(clientset, []string{"ovn-db-pod=true"}, k8sNodeName, false)
})
if err != nil {
if wait.Interrupted(err) {
klog.Errorf("Timed out while checking if OVN DB Pod runs on this %q K8s Node: %v. "+
"Not registering OVN DB Metrics on this Node.", k8sNodeName, err)
} else {
klog.Infof("Not registering OVN DB Metrics on this Node since OVN DBs are not running on this node.")
}
return
}
klog.Info("Found OVN DB Pod running on this node. Registering OVN DB Metrics")
// get the ovsdb server version info
getOvnDbVersionInfo()
// register metrics that will be served off of /metrics path
ovnRegistry.MustRegister(metricOVNDBMonitor)
ovnRegistry.MustRegister(metricOVNDBSessions)
ovnRegistry.MustRegister(prometheus.NewGaugeFunc(
prometheus.GaugeOpts{
Namespace: MetricOvnNamespace,
Subsystem: MetricOvnSubsystemDB,
Name: "build_info",
Help: "A metric with a constant '1' value labeled by ovsdb-server version and " +
"NB and SB schema version",
ConstLabels: prometheus.Labels{
"version": ovnDbVersion,
"nb_schema_version": nbDbSchemaVersion,
"sb_schema_version": sbDbSchemaVersion,
},
},
func() float64 { return 1 },
))
var dbProperties []*util.OvsDbProperties
nbdbProps, err := util.GetOvsDbProperties(util.OvnNbdbLocation)
if err != nil {
klog.Errorf("Failed to init nbdb properties: %s", err)
} else {
dbProperties = append(dbProperties, nbdbProps)
}
sbdbProps, err := util.GetOvsDbProperties(util.OvnSbdbLocation)
if err != nil {
klog.Errorf("Failed to init sbdb properties: %s", err)
} else {
dbProperties = append(dbProperties, sbdbProps)
}
if len(dbProperties) == 0 {
klog.Errorf("Failed to init properties for all databases")
return
}
// check if DB is clustered or not
// the usual way would be to call `ovsdb-tool db-is-standalone`,
// but that command requires access to the db, and we don't always have it.
// Therefore, we check cluster/status output for "not valid command" error
dbIsClustered := true
_, stderr, err := dbProperties[0].AppCtl(5, "cluster/status", dbProperties[0].DbName)
if err != nil && strings.Contains(stderr, "is not a valid command") {
dbIsClustered = false
klog.Info("Found db is standalone, don't register db_cluster metrics")
}
if dbIsClustered {
klog.Info("Found db is clustered, register db_cluster metrics")
ovnRegistry.MustRegister(metricDBClusterCID)
ovnRegistry.MustRegister(metricDBClusterSID)
ovnRegistry.MustRegister(metricDBClusterServerStatus)
ovnRegistry.MustRegister(metricDBClusterTerm)
ovnRegistry.MustRegister(metricDBClusterServerRole)
ovnRegistry.MustRegister(metricDBClusterServerVote)
ovnRegistry.MustRegister(metricDBClusterElectionTimer)
ovnRegistry.MustRegister(metricDBClusterLogIndexStart)
ovnRegistry.MustRegister(metricDBClusterLogIndexNext)
ovnRegistry.MustRegister(metricDBClusterLogNotCommitted)
ovnRegistry.MustRegister(metricDBClusterLogNotApplied)
ovnRegistry.MustRegister(metricDBClusterConnIn)
ovnRegistry.MustRegister(metricDBClusterConnOut)
ovnRegistry.MustRegister(metricDBClusterConnInErr)
ovnRegistry.MustRegister(metricDBClusterConnOutErr)
}
dbFoundViaPath := isOvnDBFoundViaPath(dbProperties)
if dbFoundViaPath {
ovnRegistry.MustRegister(metricDBSize)
} else {
klog.Infof("Unable to enable OVN DB size metric because no OVN DBs found")
}
// functions responsible for collecting the values and updating the prometheus metrics
go func() {
ticker := time.NewTicker(30 * time.Second)
defer ticker.Stop()
for {
select {
case <-ticker.C:
// To update not only values but also labels for metrics, we use Reset() to delete previous labels+value
if dbIsClustered {
resetOvnDbClusterMetrics()
}
if dbFoundViaPath {
resetOvnDbSizeMetric()
}
resetOvnDbMemoryMetrics()
for _, dbProperty := range dbProperties {
if dbIsClustered {
ovnDBClusterStatusMetricsUpdater(dbProperty)
}
if dbFoundViaPath {
ovnDBSizeMetricsUpdater(dbProperty)
}
ovnDBMemoryMetricsUpdater(dbProperty)
}
case <-stopChan:
return
}
}
}()
}
type OVNDBClusterStatus struct {
cid string
sid string
status string
role string
vote string
term float64
electionTimer float64
logIndexStart float64
logIndexNext float64
logNotCommitted float64
logNotApplied float64
connIn float64
connOut float64
connInErr float64
connOutErr float64
}
func getOVNDBClusterStatusInfo(timeout int, dbProperties *util.OvsDbProperties) (clusterStatus *OVNDBClusterStatus,
err error) {
var stdout, stderr string
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("recovering from a panic while parsing the cluster/status output "+
"for database %q: %v", dbProperties.DbName, r)
}
}()
stdout, stderr, err = dbProperties.AppCtl(timeout, "cluster/status", dbProperties.DbName)
if err != nil {
klog.Errorf("Failed to retrieve cluster/status info for database %q, stderr: %s, err: (%v)",
dbProperties.DbName, stderr, err)
return nil, err
}
clusterStatus = &OVNDBClusterStatus{}
for _, line := range strings.Split(stdout, "\n") {
idx := strings.Index(line, ":")
if idx == -1 {
continue
}
switch line[:idx] {
case "Cluster ID":
// the value is of the format `45ef (45ef51b9-9401-46e7-810d-6db0fc344ea2)`
clusterStatus.cid = strings.Trim(strings.Fields(line[idx+2:])[1], "()")
case "Server ID":
clusterStatus.sid = strings.Trim(strings.Fields(line[idx+2:])[1], "()")
case "Status":
clusterStatus.status = line[idx+2:]
case "Role":
clusterStatus.role = line[idx+2:]
case "Term":
if value, err := strconv.ParseFloat(line[idx+2:], 64); err == nil {
clusterStatus.term = value
}
case "Vote":
clusterStatus.vote = line[idx+2:]
case "Election timer":
if value, err := strconv.ParseFloat(line[idx+2:], 64); err == nil {
clusterStatus.electionTimer = value
}
case "Log":
// the value is of the format [2, 1108]
values := strings.Split(strings.Trim(line[idx+2:], "[]"), ", ")
if value, err := strconv.ParseFloat(values[0], 64); err == nil {
clusterStatus.logIndexStart = value
}
if value, err := strconv.ParseFloat(values[1], 64); err == nil {
clusterStatus.logIndexNext = value
}
case "Entries not yet committed":
if value, err := strconv.ParseFloat(line[idx+2:], 64); err == nil {
clusterStatus.logNotCommitted = value
}
case "Entries not yet applied":
if value, err := strconv.ParseFloat(line[idx+2:], 64); err == nil {
clusterStatus.logNotApplied = value
}
case "Connections":
// db cluster with 1 member has empty Connections list
if idx+2 >= len(line) {
continue
}
// the value is of the format `->0000 (->56d7) <-46ac <-56d7`
var connIn, connOut, connInErr, connOutErr float64
for _, conn := range strings.Fields(line[idx+2:]) {
if strings.HasPrefix(conn, "->") {
connOut++
} else if strings.HasPrefix(conn, "<-") {
connIn++
} else if strings.HasPrefix(conn, "(->") {
connOutErr++
} else if strings.HasPrefix(conn, "(<-") {
connInErr++
}
}
clusterStatus.connIn = connIn
clusterStatus.connOut = connOut
clusterStatus.connInErr = connInErr
clusterStatus.connOutErr = connOutErr
}
}
return clusterStatus, nil
}
func ovnDBClusterStatusMetricsUpdater(dbProperties *util.OvsDbProperties) {
clusterStatus, err := getOVNDBClusterStatusInfo(5, dbProperties)
if err != nil {
klog.Errorf(err.Error())
return
}
metricDBClusterCID.WithLabelValues(dbProperties.DbName, clusterStatus.cid).Set(1)
metricDBClusterSID.WithLabelValues(dbProperties.DbName, clusterStatus.cid, clusterStatus.sid).Set(1)
metricDBClusterServerStatus.WithLabelValues(dbProperties.DbName, clusterStatus.cid, clusterStatus.sid,
clusterStatus.status).Set(1)
metricDBClusterTerm.WithLabelValues(dbProperties.DbName, clusterStatus.cid, clusterStatus.sid).Set(clusterStatus.term)
metricDBClusterServerRole.WithLabelValues(dbProperties.DbName, clusterStatus.cid, clusterStatus.sid,
clusterStatus.role).Set(1)
metricDBClusterServerVote.WithLabelValues(dbProperties.DbName, clusterStatus.cid, clusterStatus.sid,
clusterStatus.vote).Set(1)
metricDBClusterElectionTimer.WithLabelValues(dbProperties.DbName, clusterStatus.cid,
clusterStatus.sid).Set(clusterStatus.electionTimer)
metricDBClusterLogIndexStart.WithLabelValues(dbProperties.DbName, clusterStatus.cid,
clusterStatus.sid).Set(clusterStatus.logIndexStart)
metricDBClusterLogIndexNext.WithLabelValues(dbProperties.DbName, clusterStatus.cid,
clusterStatus.sid).Set(clusterStatus.logIndexNext)
metricDBClusterLogNotCommitted.WithLabelValues(dbProperties.DbName, clusterStatus.cid,
clusterStatus.sid).Set(clusterStatus.logNotCommitted)
metricDBClusterLogNotApplied.WithLabelValues(dbProperties.DbName, clusterStatus.cid,
clusterStatus.sid).Set(clusterStatus.logNotApplied)
metricDBClusterConnIn.WithLabelValues(dbProperties.DbName, clusterStatus.cid,
clusterStatus.sid).Set(clusterStatus.connIn)
metricDBClusterConnOut.WithLabelValues(dbProperties.DbName, clusterStatus.cid,
clusterStatus.sid).Set(clusterStatus.connOut)
metricDBClusterConnInErr.WithLabelValues(dbProperties.DbName, clusterStatus.cid,
clusterStatus.sid).Set(clusterStatus.connInErr)
metricDBClusterConnOutErr.WithLabelValues(dbProperties.DbName, clusterStatus.cid,
clusterStatus.sid).Set(clusterStatus.connOutErr)
}
func resetOvnDbClusterMetrics() {
metricDBClusterCID.Reset()
metricDBClusterSID.Reset()
metricDBClusterServerStatus.Reset()
metricDBClusterTerm.Reset()
metricDBClusterServerRole.Reset()
metricDBClusterServerVote.Reset()
metricDBClusterElectionTimer.Reset()
metricDBClusterLogIndexStart.Reset()
metricDBClusterLogIndexNext.Reset()
metricDBClusterLogNotCommitted.Reset()
metricDBClusterLogNotApplied.Reset()
metricDBClusterConnIn.Reset()
metricDBClusterConnOut.Reset()
metricDBClusterConnInErr.Reset()
metricDBClusterConnOutErr.Reset()
}