136 lines
3.5 KiB
Go
136 lines
3.5 KiB
Go
package command
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import (
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"fmt"
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"reflect"
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"strconv"
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"strings"
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"time"
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)
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const (
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HealthCritical = 2
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HealthWarn = 1
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HealthPass = 0
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HealthUnknown = 3
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)
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type AgentCheckCommand struct {
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Meta
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}
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func (c *AgentCheckCommand) Help() string {
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helpText := `
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Usage: nomad check
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Display state of the Nomad agent. The exit code of the command is Nagios
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compatible and could be used with alerting systems.
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General Options:
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` + generalOptionsUsage() + `
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Agent Check Options:
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-min-peers
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Minimum number of peers that a server is expected to know.
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-min-servers
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Minumum number of servers that a client is expected to know.
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`
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return strings.TrimSpace(helpText)
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}
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func (c *AgentCheckCommand) Synopsis() string {
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return "Displays health of the local Nomad agent"
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}
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func (c *AgentCheckCommand) Run(args []string) int {
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var minPeers, minServers int
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flags := c.Meta.FlagSet("check", FlagSetClient)
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flags.Usage = func() { c.Ui.Output(c.Help()) }
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flags.IntVar(&minPeers, "min-peers", 0, "")
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flags.IntVar(&minServers, "min-servers", 1, "")
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if err := flags.Parse(args); err != nil {
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return 1
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}
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client, err := c.Meta.Client()
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if err != nil {
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c.Ui.Error(fmt.Sprintf("error initializing client: %s", err))
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return HealthCritical
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}
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info, err := client.Agent().Self()
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if err != nil {
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c.Ui.Output(fmt.Sprintf("unable to query agent info: %v", err))
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return HealthCritical
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}
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if stats, ok := info["stats"]; !ok && (reflect.TypeOf(stats).Kind() == reflect.Map) {
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c.Ui.Error("error getting stats from the agent api")
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return 1
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}
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if _, ok := info["stats"]["nomad"]; ok {
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return c.checkServerHealth(info["stats"], minPeers)
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}
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if _, ok := info["stats"]["client"]; ok {
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return c.checkClientHealth(info["stats"], minServers)
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}
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return HealthWarn
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}
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// checkServerHealth returns the health of a server.
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// TODO Add more rules for determining server health
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func (c *AgentCheckCommand) checkServerHealth(info map[string]interface{}, minPeers int) int {
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raft := info["raft"].(map[string]interface{})
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knownPeers, err := strconv.Atoi(raft["num_peers"].(string))
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if err != nil {
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c.Ui.Output(fmt.Sprintf("unable to get known peers: %v", err))
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return HealthCritical
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}
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if knownPeers < minPeers {
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c.Ui.Output(fmt.Sprintf("known peers: %v, is less than expected number of peers: %v", knownPeers, minPeers))
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return HealthCritical
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}
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return HealthPass
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}
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// checkClientHealth retuns the health of a client
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func (c *AgentCheckCommand) checkClientHealth(info map[string]interface{}, minServers int) int {
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clientStats := info["client"].(map[string]interface{})
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knownServers, err := strconv.Atoi(clientStats["known_servers"].(string))
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if err != nil {
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c.Ui.Output(fmt.Sprintf("unable to get known servers: %v", err))
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return HealthCritical
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}
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heartbeatTTL, err := time.ParseDuration(clientStats["heartbeat_ttl"].(string))
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if err != nil {
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c.Ui.Output(fmt.Sprintf("unable to parse heartbeat TTL: %v", err))
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return HealthCritical
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}
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lastHeartbeat, err := time.ParseDuration(clientStats["last_heartbeat"].(string))
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if err != nil {
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c.Ui.Output(fmt.Sprintf("unable to parse last heartbeat: %v", err))
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return HealthCritical
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}
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if lastHeartbeat > heartbeatTTL {
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c.Ui.Output(fmt.Sprintf("last heartbeat was %q time ago, expected heartbeat ttl: %q", lastHeartbeat, heartbeatTTL))
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return HealthCritical
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}
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if knownServers < minServers {
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c.Ui.Output(fmt.Sprintf("known servers: %v, is less than expected number of servers: %v", knownServers, minServers))
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return HealthCritical
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}
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return HealthPass
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}
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