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Golangで学ぶHot deployの仕組み
tsurubee
June 28, 2018
Programming
2
620
Golangで学ぶHot deployの仕組み
Server::Starterの仕組みを学び、Golangでミニマムで 実装してみた
tsurubee
June 28, 2018
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Transcript
!UTVSVCFF(.01FQBCP *OD भΠϯϑϥަྲྀษڧձ ,JYT 7PM (PMBOHͰֶͿ )PUEFQMPZͷΈ
(.0ϖύϘɹΠϯϑϥΤϯδχΞ !UTVSVCFF
݄(.0ϖύϘೖࣾ ΠϯϑϥΤϯδχΞྺϲ݄
࣍ w)PUEFQMPZͱʁͳͥඞཁ͔ʁ w)PUEFQMPZͷΈ w(PMBOHͰ࣮ͯ͠Έͨ
͍͑ͨ͜ͱ wμϯλΠϜθϩΛࢧ͑Δ)PUEFQMPZͷΈͷҰྫ w(PMBOHΛ௨ͯ͡ϨΠϠʔͷٕज़ΛֶͿ͜ͱͰɺ ΤϯδχΞͱͯ͠ͷ෯͕͕ΔͷͰʁ wٕज़ॻಡΜͰ;Ή;Ή͢ΔΑΓ࣮ͯ͠Έͨํ͕ཧղ ͍͢͠
)PUEFQMPZͱʁ ͳͥඞཁ͔ʁ
)PUEFQMPZͱʁ wΞϓϦέʔγϣϯʹϩδοΫઃఆͷมߋΛՃ͑ͨࡍ ʹɺϦΫΤετͷॲཧΛଓ͚ଓ͚ͳ͕Βɺมߋͷ༰Λ ө͢ΔͨΊͷखஈ
)PUEFQMPZͱʁ wΞϓϦέʔγϣϯʹϩδοΫઃఆͷมߋΛՃ͑ͨࡍ ʹɺϦΫΤετͷॲཧΛଓ͚ଓ͚ͳ͕Βɺมߋͷ༰Λ ө͢ΔͨΊͷखஈ ҰൠతͳσϓϩΠʢ/05)PUEFQMPZʣ 4PVSDFDPEF DIBOHF (PMBOHͷ߹ɺ όΠφϦͷ্ॻ͖
)PUEFQMPZͱʁ wΞϓϦέʔγϣϯʹϩδοΫઃఆͷมߋΛՃ͑ͨࡍ ʹɺϦΫΤετͷॲཧΛଓ͚ଓ͚ͳ͕Βɺมߋͷ༰Λ ө͢ΔͨΊͷखஈ ҰൠతͳσϓϩΠʢ/05)PUEFQMPZʣ 4PVSDFDPEF DIBOHF "QQMJDBUJPO 4UPQ (PMBOHͷ߹ɺ
όΠφϦͷ্ॻ͖
)PUEFQMPZͱʁ wΞϓϦέʔγϣϯʹϩδοΫઃఆͷมߋΛՃ͑ͨࡍ ʹɺϦΫΤετͷॲཧΛଓ͚ଓ͚ͳ͕Βɺมߋͷ༰Λ ө͢ΔͨΊͷखஈ ҰൠతͳσϓϩΠʢ/05)PUEFQMPZʣ 4PVSDFDPEF DIBOHF "QQMJDBUJPO 4UPQ "QQMJDBUJPO
4UBSU (PMBOHͷ߹ɺ όΠφϦͷ্ॻ͖ ࠶ىಈ
)PUEFQMPZͱʁ wΞϓϦέʔγϣϯʹϩδοΫઃఆͷมߋΛՃ͑ͨࡍ ʹɺϦΫΤετͷॲཧΛଓ͚ଓ͚ͳ͕Βɺมߋͷ༰Λ ө͢ΔͨΊͷखஈ ҰൠతͳσϓϩΠʢ/05)PUEFQMPZʣ 4PVSDFDPEF DIBOHF "QQMJDBUJPO 4UPQ "QQMJDBUJPO
4UBSU (PMBOHͷ߹ɺ όΠφϦͷ্ॻ͖ ϦΫΤετΛॲཧ Ͱ͖ͳ͍͕࣌ؒൃੜ ࠶ىಈ
)PUEFQMPZ͕ͳͥඞཁ͔ʁ wΘ͔ͣͳؒͰՔಇ͍ͯ͠ΔαʔϏεΛࢭΊͨ͘ͳ͍ w)PUEFQMPZΛಋೖ͢Δ͜ͱͰɺγεςϜӡ༻ʹ͓͚Δ อकੑ্͕͠ɺਝͳ։ൃαΠΫϧ͕࣮ݱͰ͖Δ
)PUEFQMPZͷΈ
4FSWFS4UBSUFS w؆୯ʹ)PUEFQMPZͰ͖ΔΑ͏ʹ͢ΔͨΊͷDQBONPEVMF w1FSMͰ࣮͞Ε͍ͯΔ͕ɺγάφϧͱڥมΛͬͨ ൚༻ੑͷߴ͍ΈͷͨΊɺ͞·͟·ͳݴޠͰར༻Մೳ
4FSWFS4UBSUFS w؆୯ʹ)PUEFQMPZͰ͖ΔΑ͏ʹ͢ΔͨΊͷDQBONPEVMF w1FSMͰ࣮͞Ε͍ͯΔ͕ɺγάφϧͱڥมΛͬͨ ൚༻ੑͷߴ͍ΈͷͨΊɺ͞·͟·ͳݴޠͰར༻Մೳ ಈ࡞Λݴ༿Ͱઆ໌͢Δͱɾɾ ʮ৽͍͠ϓϩηεΛىಈͯ͠৽͍͠ϦΫΤετΛͦͪΒʹ ྲྀͭͭ͠ɺݹ͍ϓϩηεͷϦΫΤετ͕ྃͨ͠Βਖ਼͘͠ ऴྃͤ͞Δʯ
4FSWFS4UBSUFS w؆୯ʹ)PUEFQMPZͰ͖ΔΑ͏ʹ͢ΔͨΊͷDQBONPEVMF w1FSMͰ࣮͞Ε͍ͯΔ͕ɺγάφϧͱڥมΛͬͨ ൚༻ੑͷߴ͍ΈͷͨΊɺ͞·͟·ͳݴޠͰར༻Մೳ ಈ࡞Λݴ༿Ͱઆ໌͢Δͱɾɾ ʮ৽͍͠ϓϩηεΛىಈͯ͠৽͍͠ϦΫΤετΛͦͪΒʹ ྲྀͭͭ͠ɺݹ͍ϓϩηεͷϦΫΤετ͕ྃͨ͠Βਖ਼͘͠ ऴྃͤ͞Δʯ (SBDFGVM3FTUBSUʢ༏խͳ࠶ىಈʣ
)PUEFQMPZͷΈʢ؆қ൛ʣ TUBSU@TFSWFS 1BSFOU start_server —-port 8888 —- ./server TFSWFS $IJME
TPDLFU GPSLFYFD TPDLFUΛڞ༗ BDDFQU TUBSU@TFSWFSɿ(SBDFGVMSFTUBSUͷͨΊͷϓϩάϥϜ TFSWFSɿ࣮ߦ͍ͨ͠ϓϩάϥϜ
)PUEFQMPZͷΈʢ؆қ൛ʣ TUBSU@TFSWFS 1BSFOU start_server —-port 8888 —- ./server TFSWFS $IJME
TPDLFU GPSLFYFD TPDLFUΛڞ༗ BDDFQU TUBSU@TFSWFSɿ(SBDFGVMSFTUBSUͷͨΊͷϓϩάϥϜ TFSWFSɿ࣮ߦ͍ͨ͠ϓϩάϥϜ ᶃϓϩάϥϜʹมߋʂ
)PUEFQMPZͷΈʢ؆қ൛ʣ kill -HUP <master pid> TPDLFU BDDFQU TUBSU@TFSWFS 1BSFOU TFSWFS
$IJME TUBSU@TFSWFSɿ(SBDFGVMSFTUBSUͷͨΊͷϓϩάϥϜ TFSWFSɿ࣮ߦ͍ͨ͠ϓϩάϥϜ ᶄ4*()61 ᶃϓϩάϥϜʹมߋʂ
)PUEFQMPZͷΈʢ؆қ൛ʣ kill -HUP <master pid> TPDLFU GPSLFYFD TFSWFS $IJME ᶄ4*()61
BDDFQU BDDFQU TUBSU@TFSWFS 1BSFOU TFSWFS $IJME ᶅ৽ϓϩάϥϜͰىಈ ᶃϓϩάϥϜʹมߋʂ
)PUEFQMPZͷΈʢ؆қ൛ʣ kill -HUP <master pid> TPDLFU ऴྃ͢Δલʹʜ ᶃ৽نϦΫΤεड ɹͷఀࢭ ᶄݱࡏॲཧதͷ
ϦΫΤετͷྃ GPSLFYFD (SBDFGVM4IVUEPXO BDDFQU BDDFQU TUBSU@TFSWFS 1BSFOU TFSWFS $IJME ᶅ৽ϓϩάϥϜͰىಈ ᶄ4*()61 ᶆ4*(5&3. TFSWFS $IJME ᶃϓϩάϥϜʹมߋʂ
)PUEFQMPZͷΈʢ؆қ൛ʣ TUBSU@TFSWFS 1BSFOU kill -HUP <master pid> TPDLFU GPSLFYFD TFSWFS
$IJME BDDFQU ᶆ4*(5&3. ᶅ৽ϓϩάϥϜͰىಈ ᶄ4*()61 TFSWFS $IJME ᶃϓϩάϥϜʹมߋʂ ऴྃ͢Δલʹʜ ᶃ৽نϦΫΤεड ɹͷఀࢭ ᶄݱࡏॲཧதͷ ϦΫΤετͷྃ (SBDFGVM4IVUEPXO
࣮ͯ͠Έͨ
ϛχϚϜͰ࣮ͯ͠Έͨ IUUQTHJUIVCDPNUTVSVCFFHSBDFGVMSFTUBSUHP
࣮ϙΠϯτ̍ʙγάφϧϋϯυϥ func waitSignal(l net.Listener) { c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGTERM) go func() { sig := <-c switch sig { case syscall.SIGTERM: signal.Stop(c) l.Close() } }() } γάφϧͱϓϩηεؒ௨৴ͷҰछ ϓϩηεʹγάφϧΛૹ৴͢Δͱɺͦͷϓϩηεͷਖ਼ৗॲཧʹׂΓࠐΜͰɺ γάφϧݻ༗ͷॲཧΛ࣮ߦͰ͖Δ ͓खܰʹγάφϧͷϋϯυϦϯά͕ Ͱ͖Δ
࣮ϙΠϯτ̍ʙγάφϧϋϯυϥ func waitSignal(l net.Listener) { c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGTERM) go func() { sig := <-c switch sig { case syscall.SIGTERM: signal.Stop(c) l.Close() } }() } γάφϧͱϓϩηεؒ௨৴ͷҰछ ϓϩηεʹγάφϧΛૹ৴͢Δͱɺͦͷϓϩηεͷਖ਼ৗॲཧʹׂΓࠐΜͰɺ γάφϧݻ༗ͷॲཧΛ࣮ߦͰ͖Δ HPSPVUJOFͰγάφϧΛͪड͚Δ ͓खܰʹγάφϧͷϋϯυϦϯά͕ Ͱ͖Δ
࣮ϙΠϯτ̎ʙϑΝΠϧσΟεΫϦϓλ func forkExec(l *net.TCPListener) (*os.Process, error) { progName, _ :=
exec.LookPath(os.Args[0]) pwd, _ := os.Getwd() f, _ := l.File() defer f.Close() files := []*os.File{os.Stdin, os.Stdout, os.Stderr, f} fdEnv := fmt.Sprintf("%s=%d", "FD_KEY", len(files)-1) return os.StartProcess(progName, os.Args, &os.ProcAttr{ Dir: pwd, Env: append(os.Environ(), fdEnv), Files: files, }) } ϑΝΠϧσΟεΫϓϦΫλɺϑΝΠϧιέοτͳͲΛநԽͨ͠Έ ϓϩηεΛGPSLͨ͠ࡍɺϓϩηεͷϑΝΠϧσΟεΫϦϓλΛҾ͖ܧ͙
·ͱΊ w4FSWFS4UBSUFSͷΈΛֶͼɺ(PMBOHͰϛχϚϜͰ ࣮ͯ͠Έͨ wγάφϧϑΝΠϧσΟεΫϦϓλͱ͍ͬͨ֓೦ٕज़ॻΛಡ ΜͰ;Ή;Ή͢ΔΑΓɺ࣮ͯ͠Έͨ΄͏͕ཧղ͔ͬͨ͢͠ w(PMBOHଟ͘ͷ04ͷػೳΛ؆ܿͳίʔυͰѻ͑ΔͨΊɺ ࣗͷؔ৺ྖҬΛΑΓ͍ϨΠϠʔʹ͍͛ͯͨ͘Ίʹ దͨ͠ݴޠͩ
͋Γ͕ͱ͏͍͟͝·ͨ͠ʂʂ