forked from hashicorp/nomad
/
agent.go
418 lines (381 loc) · 11.1 KB
/
agent.go
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package agent
import (
"fmt"
"io"
"log"
"net"
"os"
"path/filepath"
"sync"
"time"
"github.com/hashicorp/nomad/client"
clientconfig "github.com/hashicorp/nomad/client/config"
"github.com/hashicorp/nomad/nomad"
"github.com/hashicorp/nomad/nomad/structs"
)
// 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
logger *log.Logger
logOutput io.Writer
server *nomad.Server
client *client.Client
shutdown bool
shutdownCh chan struct{}
shutdownLock sync.Mutex
}
// NewAgent is used to create a new agent with the given configuration
func NewAgent(config *Config, logOutput io.Writer) (*Agent, error) {
// Ensure we have a log sink
if logOutput == nil {
logOutput = os.Stderr
}
a := &Agent{
config: config,
logger: log.New(logOutput, "", log.LstdFlags),
logOutput: logOutput,
shutdownCh: make(chan struct{}),
}
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
}
// serverConfig is used to generate a new server configuration struct
// for initializing a nomad server.
func (a *Agent) serverConfig() (*nomad.Config, error) {
conf := a.config.NomadConfig
if conf == nil {
conf = nomad.DefaultConfig()
}
conf.LogOutput = a.logOutput
conf.DevMode = a.config.DevMode
conf.Build = fmt.Sprintf("%s%s", a.config.Version, a.config.VersionPrerelease)
if a.config.Region != "" {
conf.Region = a.config.Region
}
if a.config.Datacenter != "" {
conf.Datacenter = a.config.Datacenter
}
if a.config.NodeName != "" {
conf.NodeName = a.config.NodeName
}
if a.config.Server.BootstrapExpect > 0 {
if a.config.Server.BootstrapExpect == 1 {
conf.Bootstrap = true
} else {
conf.BootstrapExpect = a.config.Server.BootstrapExpect
}
}
if a.config.DataDir != "" {
conf.DataDir = filepath.Join(a.config.DataDir, "server")
}
if a.config.Server.DataDir != "" {
conf.DataDir = a.config.Server.DataDir
}
if a.config.Server.ProtocolVersion != 0 {
conf.ProtocolVersion = uint8(a.config.Server.ProtocolVersion)
}
if a.config.Server.NumSchedulers != 0 {
conf.NumSchedulers = a.config.Server.NumSchedulers
}
if len(a.config.Server.EnabledSchedulers) != 0 {
conf.EnabledSchedulers = a.config.Server.EnabledSchedulers
}
// Set up the advertise addrs
if addr := a.config.AdvertiseAddrs.Serf; addr != "" {
serfAddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
return nil, fmt.Errorf("error resolving serf advertise address: %s", err)
}
conf.SerfConfig.MemberlistConfig.AdvertiseAddr = serfAddr.IP.String()
conf.SerfConfig.MemberlistConfig.AdvertisePort = serfAddr.Port
}
if addr := a.config.AdvertiseAddrs.RPC; addr != "" {
rpcAddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
return nil, fmt.Errorf("error resolving rpc advertise address: %s", err)
}
conf.RPCAdvertise = rpcAddr
}
// Set up the bind addresses
if addr := a.config.BindAddr; addr != "" {
conf.RPCAddr.IP = net.ParseIP(addr)
conf.SerfConfig.MemberlistConfig.BindAddr = addr
}
if addr := a.config.Addresses.RPC; addr != "" {
conf.RPCAddr.IP = net.ParseIP(addr)
}
if addr := a.config.Addresses.Serf; addr != "" {
conf.SerfConfig.MemberlistConfig.BindAddr = addr
}
// Set up the ports
if port := a.config.Ports.RPC; port != 0 {
conf.RPCAddr.Port = port
}
if port := a.config.Ports.Serf; port != 0 {
conf.SerfConfig.MemberlistConfig.BindPort = port
}
if gcThreshold := a.config.Server.NodeGCThreshold; gcThreshold != "" {
dur, err := time.ParseDuration(gcThreshold)
if err != nil {
return nil, err
}
conf.NodeGCThreshold = dur
}
return conf, nil
}
// clientConfig is used to generate a new client configuration struct
// for initializing a nomad client.
func (a *Agent) clientConfig() (*clientconfig.Config, error) {
// Setup the configuration
conf := a.config.ClientConfig
if conf == nil {
conf = client.DefaultConfig()
}
if a.server != nil {
conf.RPCHandler = a.server
}
conf.LogOutput = a.logOutput
conf.DevMode = a.config.DevMode
if a.config.Region != "" {
conf.Region = a.config.Region
}
if a.config.DataDir != "" {
conf.StateDir = filepath.Join(a.config.DataDir, "client")
conf.AllocDir = filepath.Join(a.config.DataDir, "alloc")
}
if a.config.Client.StateDir != "" {
conf.StateDir = a.config.Client.StateDir
}
if a.config.Client.AllocDir != "" {
conf.AllocDir = a.config.Client.AllocDir
}
conf.Servers = a.config.Client.Servers
if a.config.Client.NetworkInterface != "" {
conf.NetworkInterface = a.config.Client.NetworkInterface
}
conf.Options = a.config.Client.Options
if a.config.Client.NetworkSpeed != 0 {
conf.NetworkSpeed = a.config.Client.NetworkSpeed
}
if a.config.Client.MaxKillTimeout != "" {
dur, err := time.ParseDuration(a.config.Client.MaxKillTimeout)
if err != nil {
return nil, fmt.Errorf("Error parsing retry interval: %s", err)
}
conf.MaxKillTimeout = dur
}
conf.ClientMaxPort = a.config.Client.ClientMaxPort
conf.ClientMinPort = a.config.Client.ClientMinPort
// Setup the node
conf.Node = new(structs.Node)
conf.Node.Datacenter = a.config.Datacenter
conf.Node.Name = a.config.NodeName
conf.Node.Meta = a.config.Client.Meta
conf.Node.NodeClass = a.config.Client.NodeClass
httpAddr := fmt.Sprintf("%s:%d", a.config.BindAddr, a.config.Ports.HTTP)
if a.config.Addresses.HTTP != "" && a.config.AdvertiseAddrs.HTTP == "" {
httpAddr = fmt.Sprintf("%s:%d", a.config.Addresses.HTTP, a.config.Ports.HTTP)
if _, err := net.ResolveTCPAddr("tcp", httpAddr); err != nil {
return nil, fmt.Errorf("error resolving http addr: %v:", err)
}
} else if a.config.AdvertiseAddrs.HTTP != "" {
addr, err := net.ResolveTCPAddr("tcp", a.config.AdvertiseAddrs.HTTP)
if err != nil {
return nil, fmt.Errorf("error resolving advertise http addr: %v", err)
}
httpAddr = fmt.Sprintf("%s:%d", addr.IP.String(), addr.Port)
}
conf.Node.HTTPAddr = httpAddr
conf.Version = a.config.Version
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)
}
// Create the server
server, err := nomad.NewServer(conf)
if err != nil {
return fmt.Errorf("server setup failed: %v", err)
}
a.server = server
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 err := a.reservePortsForClient(conf); err != nil {
return err
}
// Create the client
client, err := client.NewClient(conf)
if err != nil {
return fmt.Errorf("client setup failed: %v", err)
}
a.client = client
return nil
}
// reservePortsForClient reservers 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 {
// finding the device name for loopback
deviceName, addr, mask, err := a.findLoopbackDevice()
if err != nil {
return fmt.Errorf("error finding the device name for loopback: %v", err)
}
// seeing if the user has already reserved some resources on this device
var nr *structs.NetworkResource
if conf.Node.Reserved == nil {
conf.Node.Reserved = &structs.Resources{}
}
for _, n := range conf.Node.Reserved.Networks {
if n.Device == deviceName {
nr = n
}
}
// If the user hasn't already created the device, we create it
if nr == nil {
nr = &structs.NetworkResource{
Device: deviceName,
IP: addr,
CIDR: mask,
ReservedPorts: make([]structs.Port, 0),
}
}
// appending the port ranges we want to use for the client to the list of
// reserved ports for this device
for i := conf.ClientMinPort; i <= conf.ClientMaxPort; i++ {
nr.ReservedPorts = append(nr.ReservedPorts, structs.Port{Label: fmt.Sprintf("plugin-%d", i), Value: int(i)})
}
conf.Node.Reserved.Networks = append(conf.Node.Reserved.Networks, nr)
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.Printf("[ERR] agent: client leave failed: %v", err)
}
}
if a.server != nil {
if err := a.server.Leave(); err != nil {
a.logger.Printf("[ERR] agent: server leave failed: %v", 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.Println("[INFO] agent: requesting shutdown")
if a.client != nil {
if err := a.client.Shutdown(); err != nil {
a.logger.Printf("[ERR] agent: client shutdown failed: %v", err)
}
}
if a.server != nil {
if err := a.server.Shutdown(); err != nil {
a.logger.Printf("[ERR] agent: server shutdown failed: %v", err)
}
}
a.logger.Println("[INFO] agent: 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
}