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agent.go
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agent.go
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package agent
import (
"fmt"
"io"
"io/ioutil"
golog "log"
"net"
"os"
"path/filepath"
"runtime"
"strings"
"sync"
"sync/atomic"
"time"
metrics "github.com/armon/go-metrics"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/consul/lib"
log "github.com/hashicorp/go-hclog"
uuidparse "github.com/hashicorp/go-uuid"
"github.com/hashicorp/nomad/client"
clientconfig "github.com/hashicorp/nomad/client/config"
"github.com/hashicorp/nomad/client/state"
"github.com/hashicorp/nomad/command/agent/consul"
"github.com/hashicorp/nomad/helper/pluginutils/loader"
"github.com/hashicorp/nomad/helper/uuid"
"github.com/hashicorp/nomad/nomad"
"github.com/hashicorp/nomad/nomad/structs"
"github.com/hashicorp/nomad/nomad/structs/config"
"github.com/hashicorp/raft"
)
const (
agentHttpCheckInterval = 10 * time.Second
agentHttpCheckTimeout = 5 * time.Second
serverRpcCheckInterval = 10 * time.Second
serverRpcCheckTimeout = 3 * time.Second
serverSerfCheckInterval = 10 * time.Second
serverSerfCheckTimeout = 3 * time.Second
// roles used in identifying Consul entries for Nomad agents
consulRoleServer = "server"
consulRoleClient = "client"
)
// Agent is a long running daemon that is used to run both
// clients and servers. Servers are responsible for managing
// state and making scheduling decisions. Clients can be
// scheduled to, and are responsible for interfacing with
// servers to run allocations.
type Agent struct {
config *Config
configLock sync.Mutex
logger log.Logger
httpLogger log.Logger
logOutput io.Writer
// consulService is Nomad's custom Consul client for managing services
// and checks.
consulService *consul.ServiceClient
// consulCatalog is the subset of Consul's Catalog API Nomad uses.
consulCatalog consul.CatalogAPI
// client is the launched Nomad Client. Can be nil if the agent isn't
// configured to run a client.
client *client.Client
// server is the launched Nomad Server. Can be nil if the agent isn't
// configured to run a server.
server *nomad.Server
// pluginLoader is used to load plugins
pluginLoader loader.PluginCatalog
// pluginSingletonLoader is a plugin loader that will returns singleton
// instances of the plugins.
pluginSingletonLoader loader.PluginCatalog
shutdown bool
shutdownCh chan struct{}
shutdownLock sync.Mutex
InmemSink *metrics.InmemSink
}
// NewAgent is used to create a new agent with the given configuration
func NewAgent(config *Config, logger log.Logger, logOutput io.Writer, inmem *metrics.InmemSink) (*Agent, error) {
a := &Agent{
config: config,
logOutput: logOutput,
shutdownCh: make(chan struct{}),
InmemSink: inmem,
}
// Create the loggers
a.logger = logger
a.httpLogger = a.logger.ResetNamed("http")
// Global logger should match internal logger as much as possible
golog.SetFlags(golog.LstdFlags | golog.Lmicroseconds)
if err := a.setupConsul(config.Consul); err != nil {
return nil, fmt.Errorf("Failed to initialize Consul client: %v", err)
}
if err := a.setupPlugins(); err != nil {
return nil, err
}
if err := a.setupServer(); err != nil {
return nil, err
}
if err := a.setupClient(); err != nil {
return nil, err
}
if a.client == nil && a.server == nil {
return nil, fmt.Errorf("must have at least client or server mode enabled")
}
return a, nil
}
// convertServerConfig takes an agent config and log output and returns a Nomad
// Config. There may be missing fields that must be set by the agent. To do this
// call finalizeServerConfig
func convertServerConfig(agentConfig *Config) (*nomad.Config, error) {
conf := agentConfig.NomadConfig
if conf == nil {
conf = nomad.DefaultConfig()
}
conf.DevMode = agentConfig.DevMode
conf.Build = agentConfig.Version.VersionNumber()
if agentConfig.Region != "" {
conf.Region = agentConfig.Region
}
// Set the Authoritative Region if set, otherwise default to
// the same as the local region.
if agentConfig.Server.AuthoritativeRegion != "" {
conf.AuthoritativeRegion = agentConfig.Server.AuthoritativeRegion
} else if agentConfig.Region != "" {
conf.AuthoritativeRegion = agentConfig.Region
}
if agentConfig.Datacenter != "" {
conf.Datacenter = agentConfig.Datacenter
}
if agentConfig.NodeName != "" {
conf.NodeName = agentConfig.NodeName
}
if agentConfig.Server.BootstrapExpect > 0 {
if agentConfig.Server.BootstrapExpect == 1 {
conf.Bootstrap = true
} else {
atomic.StoreInt32(&conf.BootstrapExpect, int32(agentConfig.Server.BootstrapExpect))
}
}
if agentConfig.DataDir != "" {
conf.DataDir = filepath.Join(agentConfig.DataDir, "server")
}
if agentConfig.Server.DataDir != "" {
conf.DataDir = agentConfig.Server.DataDir
}
if agentConfig.Server.ProtocolVersion != 0 {
conf.ProtocolVersion = uint8(agentConfig.Server.ProtocolVersion)
}
if agentConfig.Server.RaftProtocol != 0 {
conf.RaftConfig.ProtocolVersion = raft.ProtocolVersion(agentConfig.Server.RaftProtocol)
}
if agentConfig.Server.NumSchedulers != nil {
conf.NumSchedulers = *agentConfig.Server.NumSchedulers
}
if len(agentConfig.Server.EnabledSchedulers) != 0 {
// Convert to a set and require the core scheduler
set := make(map[string]struct{}, 4)
set[structs.JobTypeCore] = struct{}{}
for _, sched := range agentConfig.Server.EnabledSchedulers {
set[sched] = struct{}{}
}
schedulers := make([]string, 0, len(set))
for k := range set {
schedulers = append(schedulers, k)
}
conf.EnabledSchedulers = schedulers
}
if agentConfig.ACL.Enabled {
conf.ACLEnabled = true
}
if agentConfig.ACL.ReplicationToken != "" {
conf.ReplicationToken = agentConfig.ACL.ReplicationToken
}
if agentConfig.Sentinel != nil {
conf.SentinelConfig = agentConfig.Sentinel
}
if agentConfig.Server.NonVotingServer {
conf.NonVoter = true
}
if agentConfig.Server.RedundancyZone != "" {
conf.RedundancyZone = agentConfig.Server.RedundancyZone
}
if agentConfig.Server.UpgradeVersion != "" {
conf.UpgradeVersion = agentConfig.Server.UpgradeVersion
}
if agentConfig.Autopilot != nil {
if agentConfig.Autopilot.CleanupDeadServers != nil {
conf.AutopilotConfig.CleanupDeadServers = *agentConfig.Autopilot.CleanupDeadServers
}
if agentConfig.Autopilot.ServerStabilizationTime != 0 {
conf.AutopilotConfig.ServerStabilizationTime = agentConfig.Autopilot.ServerStabilizationTime
}
if agentConfig.Autopilot.LastContactThreshold != 0 {
conf.AutopilotConfig.LastContactThreshold = agentConfig.Autopilot.LastContactThreshold
}
if agentConfig.Autopilot.MaxTrailingLogs != 0 {
conf.AutopilotConfig.MaxTrailingLogs = uint64(agentConfig.Autopilot.MaxTrailingLogs)
}
if agentConfig.Autopilot.EnableRedundancyZones != nil {
conf.AutopilotConfig.EnableRedundancyZones = *agentConfig.Autopilot.EnableRedundancyZones
}
if agentConfig.Autopilot.DisableUpgradeMigration != nil {
conf.AutopilotConfig.DisableUpgradeMigration = *agentConfig.Autopilot.DisableUpgradeMigration
}
if agentConfig.Autopilot.EnableCustomUpgrades != nil {
conf.AutopilotConfig.EnableCustomUpgrades = *agentConfig.Autopilot.EnableCustomUpgrades
}
}
// Set up the bind addresses
rpcAddr, err := net.ResolveTCPAddr("tcp", agentConfig.normalizedAddrs.RPC)
if err != nil {
return nil, fmt.Errorf("Failed to parse RPC address %q: %v", agentConfig.normalizedAddrs.RPC, err)
}
serfAddr, err := net.ResolveTCPAddr("tcp", agentConfig.normalizedAddrs.Serf)
if err != nil {
return nil, fmt.Errorf("Failed to parse Serf address %q: %v", agentConfig.normalizedAddrs.Serf, err)
}
conf.RPCAddr.Port = rpcAddr.Port
conf.RPCAddr.IP = rpcAddr.IP
conf.SerfConfig.MemberlistConfig.BindPort = serfAddr.Port
conf.SerfConfig.MemberlistConfig.BindAddr = serfAddr.IP.String()
// Set up the advertise addresses
rpcAddr, err = net.ResolveTCPAddr("tcp", agentConfig.AdvertiseAddrs.RPC)
if err != nil {
return nil, fmt.Errorf("Failed to parse RPC advertise address %q: %v", agentConfig.AdvertiseAddrs.RPC, err)
}
serfAddr, err = net.ResolveTCPAddr("tcp", agentConfig.AdvertiseAddrs.Serf)
if err != nil {
return nil, fmt.Errorf("Failed to parse Serf advertise address %q: %v", agentConfig.AdvertiseAddrs.Serf, err)
}
// Server address is the serf advertise address and rpc port. This is the
// address that all servers should be able to communicate over RPC with.
serverAddr, err := net.ResolveTCPAddr("tcp", net.JoinHostPort(serfAddr.IP.String(), fmt.Sprintf("%d", rpcAddr.Port)))
if err != nil {
return nil, fmt.Errorf("Failed to resolve Serf advertise address %q: %v", agentConfig.AdvertiseAddrs.Serf, err)
}
conf.SerfConfig.MemberlistConfig.AdvertiseAddr = serfAddr.IP.String()
conf.SerfConfig.MemberlistConfig.AdvertisePort = serfAddr.Port
conf.ClientRPCAdvertise = rpcAddr
conf.ServerRPCAdvertise = serverAddr
// Set up gc threshold and heartbeat grace period
if gcThreshold := agentConfig.Server.NodeGCThreshold; gcThreshold != "" {
dur, err := time.ParseDuration(gcThreshold)
if err != nil {
return nil, err
}
conf.NodeGCThreshold = dur
}
if gcInterval := agentConfig.Server.JobGCInterval; gcInterval != "" {
dur, err := time.ParseDuration(gcInterval)
if err != nil {
return nil, err
}
conf.JobGCInterval = dur
}
if gcThreshold := agentConfig.Server.JobGCThreshold; gcThreshold != "" {
dur, err := time.ParseDuration(gcThreshold)
if err != nil {
return nil, err
}
conf.JobGCThreshold = dur
}
if gcThreshold := agentConfig.Server.EvalGCThreshold; gcThreshold != "" {
dur, err := time.ParseDuration(gcThreshold)
if err != nil {
return nil, err
}
conf.EvalGCThreshold = dur
}
if gcThreshold := agentConfig.Server.DeploymentGCThreshold; gcThreshold != "" {
dur, err := time.ParseDuration(gcThreshold)
if err != nil {
return nil, err
}
conf.DeploymentGCThreshold = dur
}
if heartbeatGrace := agentConfig.Server.HeartbeatGrace; heartbeatGrace != 0 {
conf.HeartbeatGrace = heartbeatGrace
}
if min := agentConfig.Server.MinHeartbeatTTL; min != 0 {
conf.MinHeartbeatTTL = min
}
if maxHPS := agentConfig.Server.MaxHeartbeatsPerSecond; maxHPS != 0 {
conf.MaxHeartbeatsPerSecond = maxHPS
}
if *agentConfig.Consul.AutoAdvertise && agentConfig.Consul.ServerServiceName == "" {
return nil, fmt.Errorf("server_service_name must be set when auto_advertise is enabled")
}
// Add the Consul and Vault configs
conf.ConsulConfig = agentConfig.Consul
conf.VaultConfig = agentConfig.Vault
// Set the TLS config
conf.TLSConfig = agentConfig.TLSConfig
// Setup telemetry related config
conf.StatsCollectionInterval = agentConfig.Telemetry.collectionInterval
conf.DisableTaggedMetrics = agentConfig.Telemetry.DisableTaggedMetrics
conf.DisableDispatchedJobSummaryMetrics = agentConfig.Telemetry.DisableDispatchedJobSummaryMetrics
conf.BackwardsCompatibleMetrics = agentConfig.Telemetry.BackwardsCompatibleMetrics
return conf, nil
}
// serverConfig is used to generate a new server configuration struct
// for initializing a nomad server.
func (a *Agent) serverConfig() (*nomad.Config, error) {
c, err := convertServerConfig(a.config)
if err != nil {
return nil, err
}
a.finalizeServerConfig(c)
return c, nil
}
// finalizeServerConfig sets configuration fields on the server config that are
// not staticly convertable and are from the agent.
func (a *Agent) finalizeServerConfig(c *nomad.Config) {
// Setup the logging
c.Logger = a.logger
c.LogOutput = a.logOutput
// Setup the plugin loaders
c.PluginLoader = a.pluginLoader
c.PluginSingletonLoader = a.pluginSingletonLoader
}
// clientConfig is used to generate a new client configuration struct for
// initializing a Nomad client.
func (a *Agent) clientConfig() (*clientconfig.Config, error) {
c, err := convertClientConfig(a.config)
if err != nil {
return nil, err
}
if err := a.finalizeClientConfig(c); err != nil {
return nil, err
}
return c, nil
}
// finalizeClientConfig sets configuration fields on the client config that are
// not staticly convertable and are from the agent.
func (a *Agent) finalizeClientConfig(c *clientconfig.Config) error {
// Setup the logging
c.Logger = a.logger
c.LogOutput = a.logOutput
// If we are running a server, append both its bind and advertise address so
// we are able to at least talk to the local server even if that isn't
// configured explicitly. This handles both running server and client on one
// host and -dev mode.
if a.server != nil {
if a.config.AdvertiseAddrs == nil || a.config.AdvertiseAddrs.RPC == "" {
return fmt.Errorf("AdvertiseAddrs is nil or empty")
} else if a.config.normalizedAddrs == nil || a.config.normalizedAddrs.RPC == "" {
return fmt.Errorf("normalizedAddrs is nil or empty")
}
c.Servers = append(c.Servers,
a.config.normalizedAddrs.RPC,
a.config.AdvertiseAddrs.RPC)
}
// Setup the plugin loaders
c.PluginLoader = a.pluginLoader
c.PluginSingletonLoader = a.pluginSingletonLoader
// Log deprecation messages about Consul related configuration in client
// options
var invalidConsulKeys []string
for key := range c.Options {
if strings.HasPrefix(key, "consul") {
invalidConsulKeys = append(invalidConsulKeys, fmt.Sprintf("options.%s", key))
}
}
if len(invalidConsulKeys) > 0 {
a.logger.Warn("invalid consul keys", "keys", strings.Join(invalidConsulKeys, ","))
a.logger.Warn(`Nomad client ignores consul related configuration in client options.
Please refer to the guide https://www.nomadproject.io/docs/agent/configuration/consul.html
to configure Nomad to work with Consul.`)
}
return nil
}
// convertClientConfig takes an agent config and log output and returns a client
// Config. There may be missing fields that must be set by the agent. To do this
// call finalizeServerConfig
func convertClientConfig(agentConfig *Config) (*clientconfig.Config, error) {
// Setup the configuration
conf := agentConfig.ClientConfig
if conf == nil {
conf = clientconfig.DefaultConfig()
}
conf.Servers = agentConfig.Client.Servers
conf.LogLevel = agentConfig.LogLevel
conf.DevMode = agentConfig.DevMode
if agentConfig.Region != "" {
conf.Region = agentConfig.Region
}
if agentConfig.DataDir != "" {
conf.StateDir = filepath.Join(agentConfig.DataDir, "client")
conf.AllocDir = filepath.Join(agentConfig.DataDir, "alloc")
conf.AutoFetchCNIDir = filepath.Join(agentConfig.DataDir, "cnibin")
}
if agentConfig.Client.StateDir != "" {
conf.StateDir = agentConfig.Client.StateDir
}
if agentConfig.Client.AllocDir != "" {
conf.AllocDir = agentConfig.Client.AllocDir
}
if agentConfig.Client.NetworkInterface != "" {
conf.NetworkInterface = agentConfig.Client.NetworkInterface
}
conf.ChrootEnv = agentConfig.Client.ChrootEnv
conf.Options = agentConfig.Client.Options
if agentConfig.Client.NetworkSpeed != 0 {
conf.NetworkSpeed = agentConfig.Client.NetworkSpeed
}
if agentConfig.Client.CpuCompute != 0 {
conf.CpuCompute = agentConfig.Client.CpuCompute
}
if agentConfig.Client.MemoryMB != 0 {
conf.MemoryMB = agentConfig.Client.MemoryMB
}
if agentConfig.Client.MaxKillTimeout != "" {
dur, err := time.ParseDuration(agentConfig.Client.MaxKillTimeout)
if err != nil {
return nil, fmt.Errorf("Error parsing max kill timeout: %s", err)
}
conf.MaxKillTimeout = dur
}
conf.ClientMaxPort = uint(agentConfig.Client.ClientMaxPort)
conf.ClientMinPort = uint(agentConfig.Client.ClientMinPort)
conf.DisableRemoteExec = agentConfig.Client.DisableRemoteExec
// Setup the node
conf.Node = new(structs.Node)
conf.Node.Datacenter = agentConfig.Datacenter
conf.Node.Name = agentConfig.NodeName
conf.Node.Meta = agentConfig.Client.Meta
conf.Node.NodeClass = agentConfig.Client.NodeClass
// Set up the HTTP advertise address
conf.Node.HTTPAddr = agentConfig.AdvertiseAddrs.HTTP
// Reserve resources on the node.
// COMPAT(0.10): Remove in 0.10
r := conf.Node.Reserved
if r == nil {
r = new(structs.Resources)
conf.Node.Reserved = r
}
r.CPU = agentConfig.Client.Reserved.CPU
r.MemoryMB = agentConfig.Client.Reserved.MemoryMB
r.DiskMB = agentConfig.Client.Reserved.DiskMB
res := conf.Node.ReservedResources
if res == nil {
res = new(structs.NodeReservedResources)
conf.Node.ReservedResources = res
}
res.Cpu.CpuShares = int64(agentConfig.Client.Reserved.CPU)
res.Memory.MemoryMB = int64(agentConfig.Client.Reserved.MemoryMB)
res.Disk.DiskMB = int64(agentConfig.Client.Reserved.DiskMB)
res.Networks.ReservedHostPorts = agentConfig.Client.Reserved.ReservedPorts
conf.Version = agentConfig.Version
if *agentConfig.Consul.AutoAdvertise && agentConfig.Consul.ClientServiceName == "" {
return nil, fmt.Errorf("client_service_name must be set when auto_advertise is enabled")
}
conf.ConsulConfig = agentConfig.Consul
conf.VaultConfig = agentConfig.Vault
// Set up Telemetry configuration
conf.StatsCollectionInterval = agentConfig.Telemetry.collectionInterval
conf.PublishNodeMetrics = agentConfig.Telemetry.PublishNodeMetrics
conf.PublishAllocationMetrics = agentConfig.Telemetry.PublishAllocationMetrics
conf.DisableTaggedMetrics = agentConfig.Telemetry.DisableTaggedMetrics
conf.BackwardsCompatibleMetrics = agentConfig.Telemetry.BackwardsCompatibleMetrics
// Set the TLS related configs
conf.TLSConfig = agentConfig.TLSConfig
conf.Node.TLSEnabled = conf.TLSConfig.EnableHTTP
// Set the GC related configs
conf.GCInterval = agentConfig.Client.GCInterval
conf.GCParallelDestroys = agentConfig.Client.GCParallelDestroys
conf.GCDiskUsageThreshold = agentConfig.Client.GCDiskUsageThreshold
conf.GCInodeUsageThreshold = agentConfig.Client.GCInodeUsageThreshold
conf.GCMaxAllocs = agentConfig.Client.GCMaxAllocs
if agentConfig.Client.NoHostUUID != nil {
conf.NoHostUUID = *agentConfig.Client.NoHostUUID
} else {
// Default no_host_uuid to true
conf.NoHostUUID = true
}
// Setup the ACLs
conf.ACLEnabled = agentConfig.ACL.Enabled
conf.ACLTokenTTL = agentConfig.ACL.TokenTTL
conf.ACLPolicyTTL = agentConfig.ACL.PolicyTTL
// Setup networking configration
conf.CNIPath = agentConfig.Client.CNIPath
conf.BridgeNetworkName = agentConfig.Client.BridgeNetworkName
conf.BridgeNetworkAllocSubnet = agentConfig.Client.BridgeNetworkSubnet
conf.AutoFetchCNI = agentConfig.Client.AutoFetchCNIPlugins
conf.AutoFetchCNIURL = agentConfig.Client.AutoFetchCNIPluginsURL
return conf, nil
}
// setupServer is used to setup the server if enabled
func (a *Agent) setupServer() error {
if !a.config.Server.Enabled {
return nil
}
// Setup the configuration
conf, err := a.serverConfig()
if err != nil {
return fmt.Errorf("server config setup failed: %s", err)
}
// Generate a node ID and persist it if it is the first instance, otherwise
// read the persisted node ID.
if err := a.setupNodeID(conf); err != nil {
return fmt.Errorf("setting up server node ID failed: %s", err)
}
// Sets up the keyring for gossip encryption
if err := a.setupKeyrings(conf); err != nil {
return fmt.Errorf("failed to configure keyring: %v", err)
}
// Create the server
server, err := nomad.NewServer(conf, a.consulCatalog)
if err != nil {
return fmt.Errorf("server setup failed: %v", err)
}
a.server = server
// Consul check addresses default to bind but can be toggled to use advertise
rpcCheckAddr := a.config.normalizedAddrs.RPC
serfCheckAddr := a.config.normalizedAddrs.Serf
if *a.config.Consul.ChecksUseAdvertise {
rpcCheckAddr = a.config.AdvertiseAddrs.RPC
serfCheckAddr = a.config.AdvertiseAddrs.Serf
}
// Create the Nomad Server services for Consul
if *a.config.Consul.AutoAdvertise {
httpServ := &structs.Service{
Name: a.config.Consul.ServerServiceName,
PortLabel: a.config.AdvertiseAddrs.HTTP,
Tags: append([]string{consul.ServiceTagHTTP}, a.config.Consul.Tags...),
}
const isServer = true
if check := a.agentHTTPCheck(isServer); check != nil {
httpServ.Checks = []*structs.ServiceCheck{check}
}
rpcServ := &structs.Service{
Name: a.config.Consul.ServerServiceName,
PortLabel: a.config.AdvertiseAddrs.RPC,
Tags: append([]string{consul.ServiceTagRPC}, a.config.Consul.Tags...),
Checks: []*structs.ServiceCheck{
{
Name: a.config.Consul.ServerRPCCheckName,
Type: "tcp",
Interval: serverRpcCheckInterval,
Timeout: serverRpcCheckTimeout,
PortLabel: rpcCheckAddr,
},
},
}
serfServ := &structs.Service{
Name: a.config.Consul.ServerServiceName,
PortLabel: a.config.AdvertiseAddrs.Serf,
Tags: append([]string{consul.ServiceTagSerf}, a.config.Consul.Tags...),
Checks: []*structs.ServiceCheck{
{
Name: a.config.Consul.ServerSerfCheckName,
Type: "tcp",
Interval: serverSerfCheckInterval,
Timeout: serverSerfCheckTimeout,
PortLabel: serfCheckAddr,
},
},
}
// Add the http port check if TLS isn't enabled
consulServices := []*structs.Service{
rpcServ,
serfServ,
httpServ,
}
if err := a.consulService.RegisterAgent(consulRoleServer, consulServices); err != nil {
return err
}
}
return nil
}
// setupNodeID will pull the persisted node ID, if any, or create a random one
// and persist it.
func (a *Agent) setupNodeID(config *nomad.Config) error {
// For dev mode we have no filesystem access so just make a node ID.
if a.config.DevMode {
config.NodeID = uuid.Generate()
return nil
}
// Load saved state, if any. Since a user could edit this, we also
// validate it. Saved state overwrites any configured node id
fileID := filepath.Join(config.DataDir, "node-id")
if _, err := os.Stat(fileID); err == nil {
rawID, err := ioutil.ReadFile(fileID)
if err != nil {
return err
}
nodeID := strings.TrimSpace(string(rawID))
nodeID = strings.ToLower(nodeID)
if _, err := uuidparse.ParseUUID(nodeID); err != nil {
return err
}
config.NodeID = nodeID
return nil
}
// If they've configured a node ID manually then just use that, as
// long as it's valid.
if config.NodeID != "" {
config.NodeID = strings.ToLower(config.NodeID)
if _, err := uuidparse.ParseUUID(config.NodeID); err != nil {
return err
}
// Persist this configured nodeID to our data directory
if err := lib.EnsurePath(fileID, false); err != nil {
return err
}
if err := ioutil.WriteFile(fileID, []byte(config.NodeID), 0600); err != nil {
return err
}
return nil
}
// If we still don't have a valid node ID, make one.
if config.NodeID == "" {
id := uuid.Generate()
if err := lib.EnsurePath(fileID, false); err != nil {
return err
}
if err := ioutil.WriteFile(fileID, []byte(id), 0600); err != nil {
return err
}
config.NodeID = id
}
return nil
}
// setupKeyrings is used to initialize and load keyrings during agent startup
func (a *Agent) setupKeyrings(config *nomad.Config) error {
file := filepath.Join(a.config.DataDir, serfKeyring)
if a.config.Server.EncryptKey == "" {
goto LOAD
}
if _, err := os.Stat(file); err != nil {
if err := initKeyring(file, a.config.Server.EncryptKey); err != nil {
return err
}
}
LOAD:
if _, err := os.Stat(file); err == nil {
config.SerfConfig.KeyringFile = file
}
if err := loadKeyringFile(config.SerfConfig); err != nil {
return err
}
// Success!
return nil
}
// setupClient is used to setup the client if enabled
func (a *Agent) setupClient() error {
if !a.config.Client.Enabled {
return nil
}
// Setup the configuration
conf, err := a.clientConfig()
if err != nil {
return fmt.Errorf("client setup failed: %v", err)
}
// Reserve some ports for the plugins if we are on Windows
if runtime.GOOS == "windows" {
if err := a.reservePortsForClient(conf); err != nil {
return err
}
}
if conf.StateDBFactory == nil {
conf.StateDBFactory = state.GetStateDBFactory(conf.DevMode)
}
client, err := client.NewClient(conf, a.consulCatalog, a.consulService)
if err != nil {
return fmt.Errorf("client setup failed: %v", err)
}
a.client = client
// Create the Nomad Client services for Consul
if *a.config.Consul.AutoAdvertise {
httpServ := &structs.Service{
Name: a.config.Consul.ClientServiceName,
PortLabel: a.config.AdvertiseAddrs.HTTP,
Tags: append([]string{consul.ServiceTagHTTP}, a.config.Consul.Tags...),
}
const isServer = false
if check := a.agentHTTPCheck(isServer); check != nil {
httpServ.Checks = []*structs.ServiceCheck{check}
}
if err := a.consulService.RegisterAgent(consulRoleClient, []*structs.Service{httpServ}); err != nil {
return err
}
}
return nil
}
// agentHTTPCheck returns a health check for the agent's HTTP API if possible.
// If no HTTP health check can be supported nil is returned.
func (a *Agent) agentHTTPCheck(server bool) *structs.ServiceCheck {
// Resolve the http check address
httpCheckAddr := a.config.normalizedAddrs.HTTP
if *a.config.Consul.ChecksUseAdvertise {
httpCheckAddr = a.config.AdvertiseAddrs.HTTP
}
check := structs.ServiceCheck{
Name: a.config.Consul.ClientHTTPCheckName,
Type: "http",
Path: "/v1/agent/health?type=client",
Protocol: "http",
Interval: agentHttpCheckInterval,
Timeout: agentHttpCheckTimeout,
PortLabel: httpCheckAddr,
}
// Switch to endpoint that doesn't require a leader for servers
if server {
check.Name = a.config.Consul.ServerHTTPCheckName
check.Path = "/v1/agent/health?type=server"
}
if !a.config.TLSConfig.EnableHTTP {
// No HTTPS, return a plain http check
return &check
}
if a.config.TLSConfig.VerifyHTTPSClient {
a.logger.Warn("not registering Nomad HTTPS Health Check because verify_https_client enabled")
return nil
}
// HTTPS enabled; skip verification
check.Protocol = "https"
check.TLSSkipVerify = true
return &check
}
// reservePortsForClient reserves a range of ports for the client to use when
// it creates various plugins for log collection, executors, drivers, etc
func (a *Agent) reservePortsForClient(conf *clientconfig.Config) error {
if conf.Node.ReservedResources == nil {
conf.Node.ReservedResources = &structs.NodeReservedResources{}
}
res := conf.Node.ReservedResources.Networks.ReservedHostPorts
if res == "" {
res = fmt.Sprintf("%d-%d", conf.ClientMinPort, conf.ClientMaxPort)
} else {
res += fmt.Sprintf(",%d-%d", conf.ClientMinPort, conf.ClientMaxPort)
}
conf.Node.ReservedResources.Networks.ReservedHostPorts = res
return nil
}
// findLoopbackDevice iterates through all the interfaces on a machine and
// returns the ip addr, mask of the loopback device
func (a *Agent) findLoopbackDevice() (string, string, string, error) {
var ifcs []net.Interface
var err error
ifcs, err = net.Interfaces()
if err != nil {
return "", "", "", err
}
for _, ifc := range ifcs {
addrs, err := ifc.Addrs()
if err != nil {
return "", "", "", err
}
for _, addr := range addrs {
var ip net.IP
switch v := addr.(type) {
case *net.IPNet:
ip = v.IP
case *net.IPAddr:
ip = v.IP
}
if ip.IsLoopback() {
if ip.To4() == nil {
continue
}
return ifc.Name, ip.String(), addr.String(), nil
}
}
}
return "", "", "", fmt.Errorf("no loopback devices with IPV4 addr found")
}
// Leave is used gracefully exit. Clients will inform servers
// of their departure so that allocations can be rescheduled.
func (a *Agent) Leave() error {
if a.client != nil {
if err := a.client.Leave(); err != nil {
a.logger.Error("client leave failed", "error", err)
}
}
if a.server != nil {
if err := a.server.Leave(); err != nil {
a.logger.Error("server leave failed", "error", err)
}
}
return nil
}
// Shutdown is used to terminate the agent.
func (a *Agent) Shutdown() error {
a.shutdownLock.Lock()
defer a.shutdownLock.Unlock()
if a.shutdown {
return nil
}
a.logger.Info("requesting shutdown")
if a.client != nil {
if err := a.client.Shutdown(); err != nil {
a.logger.Error("client shutdown failed", "error", err)
}
}
if a.server != nil {
if err := a.server.Shutdown(); err != nil {
a.logger.Error("server shutdown failed", "error", err)
}
}
if err := a.consulService.Shutdown(); err != nil {
a.logger.Error("shutting down Consul client failed", "error", err)
}
a.logger.Info("shutdown complete")
a.shutdown = true
close(a.shutdownCh)
return nil
}
// RPC is used to make an RPC call to the Nomad servers
func (a *Agent) RPC(method string, args interface{}, reply interface{}) error {
if a.server != nil {
return a.server.RPC(method, args, reply)
}
return a.client.RPC(method, args, reply)
}
// Client returns the configured client or nil
func (a *Agent) Client() *client.Client {
return a.client
}
// Server returns the configured server or nil
func (a *Agent) Server() *nomad.Server {
return a.server
}
// Stats is used to return statistics for debugging and insight
// for various sub-systems
func (a *Agent) Stats() map[string]map[string]string {
stats := make(map[string]map[string]string)
if a.server != nil {
subStat := a.server.Stats()
for k, v := range subStat {
stats[k] = v
}
}
if a.client != nil {
subStat := a.client.Stats()
for k, v := range subStat {
stats[k] = v
}
}
return stats
}
// ShouldReload determines if we should reload the configuration and agent
// connections. If the TLS Configuration has not changed, we shouldn't reload.
func (a *Agent) ShouldReload(newConfig *Config) (agent, http bool) {
a.configLock.Lock()
defer a.configLock.Unlock()
if newConfig.LogLevel != "" && newConfig.LogLevel != a.config.LogLevel {
agent = true
}
isEqual, err := a.config.TLSConfig.CertificateInfoIsEqual(newConfig.TLSConfig)
if err != nil {
a.logger.Error("parsing TLS certificate", "error", err)
return agent, false
} else if !isEqual {
return true, true
}
// Allow the ability to only reload HTTP connections
if a.config.TLSConfig.EnableHTTP != newConfig.TLSConfig.EnableHTTP {
http = true
agent = true
}
// Allow the ability to only reload HTTP connections
if a.config.TLSConfig.EnableRPC != newConfig.TLSConfig.EnableRPC {
agent = true
}
return agent, http
}
// Reload handles configuration changes for the agent. Provides a method that
// is easier to unit test, as this action is invoked via SIGHUP.
func (a *Agent) Reload(newConfig *Config) error {
a.configLock.Lock()
defer a.configLock.Unlock()
updatedLogging := newConfig != nil && (newConfig.LogLevel != a.config.LogLevel)
if newConfig == nil || newConfig.TLSConfig == nil && !updatedLogging {
return fmt.Errorf("cannot reload agent with nil configuration")
}
if updatedLogging {
a.config.LogLevel = newConfig.LogLevel
a.logger.SetLevel(log.LevelFromString(newConfig.LogLevel))
}
fullUpdateTLSConfig := func() {
// Completely reload the agent's TLS configuration (moving from non-TLS to
// TLS, or vice versa)
// This does not handle errors in loading the new TLS configuration
a.config.TLSConfig = newConfig.TLSConfig.Copy()
}