Go in production - case of Gannoy -

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1. - case of Gannoy - ࡾ୐༔հ / Pepabo R&D Institute,

   GMO Pepabo, Inc. 2017.10.17 Fukuoka.go#9 Go in production

2. ϓϦϯγύϧΤϯδχΞ ࡾ୐ ༔հ / @monochromegane 2 http://blog.monochromegane.com Yusuke Miyake ϖύϘݚڀॴ

   ݚڀһ

3. 1. Goຊ൪ӡ༻ͷཁ݅ 2. Goຊ൪ӡ༻ͷ࣮ݱ 3. ·ͱΊ 3 ໨࣍

4. 1. GannoyʹΈΔ Goຊ൪ӡ༻ͷཁ݅

5. Gannoy Approximate nearest neighbor search server and dynamic index written

   in Golang. https://github.com/monochromegane/gannoy

6. Similar images search system using Gannoy 6 Features Similar items

   Gannoy [2048]float64 query by http find similar features mapping similar features to items response Deep CNN index Features [2048]float64 Deep CNN register by http

7. • HTTP based Approximate nearest neighbor search server • Using

   labstack/echo • Go 1.8+ 7 Gannoy

8. Goຊ൪ӡ༻ͷཁ݅

9. • Graceful restart • Daemonize • Monitoring • Log rotation

   9 Goຊ൪ӡ༻ͷཁ݅ • Configuration • Build • Deploy

10. 2. GannoyʹΈΔ Goຊ൪ӡ༻ͷ࣮ݱ

11. Graceful restart 11 go-server-starter + http.Server#Shutdown() import "github.com/lestrrat/go-server-starter/listener" e :=

    echo.New() listeners, err := listener.ListenAll() if err != nil && err != listener.ErrNoListeningTarget { fmt.Fprintln(os.Stderr, err) os.Exit(1) } e.Listener = netutil.LimitListener(listeners[0], opts.MaxConnections) Listen from start_server socket.

12. Graceful restart 12 go-server-starter + http.Server#Shutdown() go func() { if

    err := e.Start(""); err != nil { e.Logger.Info("Shutting down the server") } }() sigCh := make(chan os.Signal, 1) signal.Notify(sigCh, sig) <-sigCh ctx, cancel := context.WithTimeout(context.Background(), time.Duration(opts.ShutDownTimeout)*time.Second) defer cancel() if err := e.Shutdown(ctx); err != nil { e.Logger.Fatal(err) } Start server as goroutines. Wait SIGTERM. Graceful shutdown using http.Server.

13. Daemonize 13 Systemd [Unit] Description=Gannoy DB ConditionPathExists=/usr/bin/start_server ConditionPathExists=/usr/bin/gannoy-db After=network.target [Service]

    User=gannoy Group=gannoy Type=simple PIDFile=/var/run/gannoy/server_starter.pid ExecStart=/usr/bin/start_server --port 8080 --pid-file /var/run/gannoy/server_starter.pid -- / usr/bin/gannoy-db -c /etc/gannoy/gannoy-db.toml ExecReload=/bin/kill -HUP $MAINPID ExecStop=/bin/kill -TERM $MAINPID [Install] WantedBy=multi-user.target gannoy-db.service

14. Monitoring 14 health-check endpoint + Consul e.GET("/health", func(c echo.Context) error

    { return c.NoContent(http.StatusOK) }) { "service": { (snip) "port": 80, "checks": [ { "script": "/usr/bin/check-http -u http://localhost/health", "interval": "30s" } ] } } health-check endpoint consul.d/gannoy.json

15. Log ratation 15 logrotate /var/log/gannoy/gannoy-db.log { daily rotate 7 missingok

    notifempty compress postrotate kill -HUP `cat /var/run/gannoy/server_starter.pid` endscript } gannoy-db.logrotate reopen logfile.

16. Configuration 16 monochromegane/conflag // Parse option from args and configuration

    file. conflag.LongHyphen = true conflag.BoolValue = false parser := flags.NewParser(&opts, flags.Default) _, err := parser.ParseArgs(os.Args[1:]) if err != nil { os.Exit(1) } if opts.Config != "" { if args, err := conflag.ArgsFrom(opts.Config); err == nil { if _, err := parser.ParseArgs(args); err != nil { os.Exit(1) } } } _, err = parser.ParseArgs(os.Args[1:]) if err != nil { os.Exit(1) } Read option from config. Overwrite option from args. data-dir = "/var/lib/gannoy" log-dir = "/var/log/gannoy" lock-dir = "/var/run/gannoy" server-starter = true auto-save = true gannoy-db —data-dir=“data”

17. Configuration 17 monochromegane/conflag http://blog.monochromegane.com/blog/2015/05/30/conflag/

18. Build 18 rpmbuild + docker-compose . !"" Dockerfile.rpmbuild !"" docker-compose.yml

    !"" rpmbuild # !"" RPMS # # $"" x86_64 # # $"" gannoy-0.0.1-8.x86_64.rpm # !"" SOURCES # # !"" gannoy-db.logrotate # # !"" gannoy-db.service # # $"" gannoy-db.toml # $"" SPECS # $"" gannoy.spec $"" version.go version: '2' services: gannoy-rpmbuild: build: context: . dockerfile: Dockerfile.rpmbuild command: cp /root/rpmbuild/RPMS/x86_64/ gannoy-0.0.1-8.x86_64.rpm /tmp/rpmbuild/RPMS/ x86_64/. volumes: - .:/tmp:rw RUN rpmbuild -bb /root/rpmbuild/SPECS/gannoy.spec $ docker-compose build gannoy-rpmbuild $ docker-compose run gannoy-rpmbuild docker-compose.yml Dockerfile.rpmbuild

19. Deploy (and test) 19 Puppet + Serverspec class gannoy::install {

    include ::go_start_server $rpm = 'gannoy-0.0.1-8.x86_64.rpm' file { "/usr/local/src/${rpm}": ensure => present, source => "puppet:///modules/gannoy/${rpm}", mode => '0755', owner => 'root', notify => Package['gannoy'], } -> package { 'gannoy': ensure => '0.0.1-8', source => "/usr/local/src/${rpm}", provider => rpm, } (snip) } (snip) describe service('gannoy-db') do it { should be_enabled } end describe package('gannoy') do it { should be_installed.with_version('0.0.1-8') } end (snip)

20. ·ͱΊ

21. • σʔϞϯԽ͕ඞཁͳGoΞϓϦͷຊ൪ӡ༻͸όΠφϦҎ֎ʹ΋ඞཁͳ ϑΝΠϧ͕͋ΔͷͰύοέʔδϯάͨ͠΄͏͕औΓճָ͕͠ • ΦϓγϣϯͱઃఆϑΝΠϧͷڞ௨Խʹ͸conflag͕ศར • ϕετϓϥΫςΟε͸໛ࡧதɻσΟεΧογϣϯ͠·͠ΐ͏ɻ 21 ·ͱΊ

22. ݚڀһɺੵۃతʹืूதʂ http://rand.pepabo.com/