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「全然わからない。俺たちは雰囲気でコンテナをやっている」 /operating-contain...
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KONDO Uchio
February 17, 2018
Technology
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18k
「全然わからない。俺たちは雰囲気でコンテナをやっている」 /operating-containers-just-with-a-hunch
Hacker Tackle 2018 発表資料
KONDO Uchio
February 17, 2018
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Transcript
ۙ౻Ӊஐ࿕(.01FQBCP *OD !)BDLFS5BDLMF શવΘ͔Βͳ͍ɻ ԶͨͪงғؾͰ ίϯςφΛͬͯ ͍Δ
ۙ౻Ӊஐ࿕!VE[VSB &$αʔϏεɺΦϯϥΠϯήʔϜ։ൃͳͲΛܦͯɺ ΑΓ(.0ϖύϘٕज़ج൫νʔϜɻಉΑ ΓԬࢢʹҠॅɻڞஶʹʰύʔϑΣΫτ3VCZʱ ʰύʔϑΣΫτ3BJMTʱͳͲ͕͋ΔɻNSVCZΛΈ ࠐΜͩ-JOVYίϯςφϥϯλΠϜʮ)BDPOJXBʯͷ ࡞ऀɻ)BDPOJXBؔ࿈ͷ׆ಈͱͯ͠ɺ3VCZ,BJHJ ͰͷτʔΫ͕࠾͞Εɺ·ͨιϑτΣΞ ͰୈճԬ3VCZେΛडɻݱࡏɺ)BDPOJXB Λϕʔεͱͨ͠ΫϥυαʔϏεͰ͋ΔʮϩϦϙο
ϓʂϚωʔδυΫϥυʯʹٕࣾज़ސ ͱ͠ ͯࢀՃ͍ͯ͠Δɻ
ࠓͷ͓ w งғؾͰίϯςφͷதΛཧղ͢Δ w งғؾͰίϯςφͷΤίγεςϜΛཧղɹ w งғؾͰίϯςφΛࣗ࡞͢Δʹ w ͳΜͳΜͩΑʂงғؾͬͯʂʢ·ͱΊʣ
งғؾͰίϯ ςφͷதΛ ཧղ͢Δ
ίϯςφԾԽ
ίϯςφɺ ࡞ͬͨ͜ͱ͋Γ·͔͢ʁ
͡Ό͋࡞ͬͯΈ·͠ΐ͏͔
%PDLFSΛྫʹ͠·͢ wී௨ͷ-JOVY 6CVOUV#JPOJD ʹ%PDLFSΛೖΕͯɺෳݸίϯςφΛ ࡞ͬͯΈΔɻ $ docker run --rm -d
debian:latest /bin/sleep 99 d003ac5389a1631d789f5d1b77bf201adc517ad9acc91bd5...
࠷ۙ DF ͷ%PDLFS w͜͜ͰɺΈͳ͞Μ͓ೃછΈͷQTίϚϯυΛൃߦͯ͠Έ·͠ΐ͏ w;Ή;Ή
ίϯςφͷTMFFQίϚϯυ ϗετϚγϯ͔Β ௨ৗͷϓϩηεͷΑ͏ʹݟ͑·͢
ͭ·Γ
ίϯςφϓϩηεͳΜ ͩʂʂʂʂʂʂʂʂʂʂʂʂʂʂʂʂ ʂʂʂʂʂʂʂʂʂʂ
ίϯςφʮԾԽʯͬͯݴ͏͚ΕͲ wίϯςφͷ࣮ݱʹ͓͍ͯɺϋʔυΣΞͷԾԽʢ$16ɺϝϞϦͳ Ͳʣߦ͍ͬͯͳ͍͜ͱʹҙɻ wEPDLFSSVOFYFDͳͲͰʮಠཱͨ͠-JOVYͷڥʹೖΔʯ͜ͱ͕ग़དྷ ΔɻͦͷΑ͏ʹಠཱͨ͠ڥΛ࡞ΕΔ͜ͱࣗମΛࢦͯ͠ɺʮԾԽʯ ͱݺΜͰ͍Δͱݴ͑Δɻ wٯʹϓϩηεͳͷͰɺͦͷଞͷԾԽख๏ΑΓܰྔͩ͠ɺΑΓࡉ͔ ੍͍ޚ͕ՄೳʹͳΔଆ໘͋Δɻ
DGͦͷଞͷԾԽ wϗετܕ͋Δ04ʹɺઐ༻ͷιϑτΣΞΛೖΕͯԾԽ͢Δ wϋΠύʔόΠβܕԾԽઐ༻ͷ04ͷ্Ͱ7.Λ্͛Δ wͳͲͳͲɺ࣮ݱͷํࣜز͔ͭ͋Δ͕ɺಛͱͯ͠ɺϋʔυΣΞͷ ԾԽΛߦ͏ɻͦͷͨΊ04ͷछྨࣗ༝ʹͳΔ͕ɺίϯςφΑΓ Φʔόʔϔου͕େ͖͘ͳΔɻ
None
None
ϓϩηε͕ίϯςφԽ͍ͯ͠Δ͔ௐΔ wΈΜͳ/procͷ͜ͱศརʹ׆༻ͯ͠·͢ΑͶʁ w/proc/PID/*ʹଘࡏ͢ΔϑΝΠϧʹ͍ͭͯɺී௨ͷϓϩηεͷͷ ͱʮίϯςφԽͨ͠ʯͷͷΛൺֱ͢Δͱɺز͔ͭͷଐੑ͕ҟͳͬͯ ͍Δ͜ͱ͕Θ͔Δɻ w/proc/PID/ns, /proc/PID/cgroup, /proc/PID/status,
ʮίϯςφԽʯ͢ΔͨΊͷ -JOVYͷػೳ
-JOVY/BNFTQBDF
QSPD1*%OT͕ҧ͏ wΑ͘ݟΔͱҧ͏ wVUTͱ͔JQDͱ͔NOUͱ͔ ͍Ζ͍Ζ͋Δ w͜ΕΒɺάϩʔόϧͳ໊લۭؒͱผͷ04ϦιʔεΛׂΓͯΒ Ε͍ͯΔ͜ͱΛҙຯ͢Δɻͦ͏͍͏໊લۭؒΛ-JOVY/BNFTQBDFͱ ݺΜͰ͍Δɻ wྫ͑654/BNFTQBDFάϩʔόϧͳϗετ໊ͱಠཱͨ͠ϗετ໊Λ࣋ͯΔ
None
ίϯςφͷωοτϫʔΫʹʮೖΔʯ wOTFOUFSͱ͍͏ίϚϯυͰ-JOVY/BNFTQBDFʹೖΔ͜ͱ͕Ͱ͖Δɻ wEPDLFSFYFDͱൺֱͯ͠ΈΑ͏ $ sudo nsenter \ --net=/proc/$( \ docker
inspect hackertackle_1 -f ‘{{.State.Pid}}' \ )/ns/net
EPDLFSFYFD OTFOUFS
DHSPVQ
DHSPVQͱ wDHSPVQ $POUSPM(SPVQ ͱɺҙͷϓϩηεΛάϧʔϐϯάͰ͖Δ ػೳɻͨͩάϧʔϓʹ͢Δ͚ͩͰͳ͘ɺͦͷάϧʔϓ͝ͱʹ04ͷϋʔ υΣΞͳͲͷϦιʔεΛ੍ݶɺ͋Δ͍౷ܭใΛऔಘͰ͖Δɻ wྫ w$16ͷ੍ݶάϧʔϓશମͷ$16ར༻Λ/ʹԡ͑ͨ͞ΓɺίΞΛ ݻఆͨ͠ΓͰ͖Δɻ·ͨ$16࣌ؒͷ౷ܭΘ͔Δ wϝϞϦͷ੍ݶάϧʔϓશମͰ͏ϝϞϦར༻ঢ়گΛ੍ݶɺܭଌͰ͖
Δɻݶքʹୡͨ࣌͠ͷڍಈબΔ
QJETαϒγεςϜ wͦͷάϧʔϓʹॴଐ͢ΔϓϩηεΛ੍ݶͰ͖Δɻ wDHSPVQಛఆͷϑΝΠϧʹॻ͖ࠐΉ͜ͱͰγϡοͱ͑Δɻ ݸʹ੍ݶ
ͦͷάϧʔϓʹॴଐ͢ΔϓϩηεΛ ੍ݶͰ͖Δ ʹ GPSLCPNCରࡦ͕Ͱ͖Δ
ࢼͯ͠Έ·͠ΐ͏ w˞ࣦഊ͢Δͱɺ؋͝ͱམͪ·͢ term1:~$ echo $$ #=> 5849 term2:~$ echo 5849
| \ sudo tee /sys/fs/cgroup/pids/hackertackle/tasks term1:~$ cat /proc/self/cgroup | grep pids 3:pids:/hackertackle term1:~$ #... doing fork bomb ...
ੜؐ
ͦͷଞͷػೳ wDISPPUQJWPU@SPPU͋ΔαϒσΟϨΫτϦʹೖΓࠐΉ wSMJNJUVMJNJUͷͭ w,FSOFM$BQBCJMJUZSPPUͷݖݶΛׂͯ͠Ұ෦Λ༩ɺୣ͏ wTFDDPNQγεςϜίʔϧͷϑΟϧλϦϯά w."$ BQQBSNPS4&-JOVY50.0:0ଞ
TFDDPNQͷྫ wίϯςφ෦ͰɺNLEJSίϚϯυͰ͏γεςϜίʔϧ ʢmkdir(2)ʣDIPXOίϚϯυͰ͏ͭʢchownat(2)ʣͷݺͼ ग़͠ΛϑΟϧλʔ͢Δ͜ͱ͕Ͱ͖Δɻͨͱ͑SPPUͰ֘ૢ࡞͕ෆՄ ೳʹɻ͖ͳίϚϯυΛstrace(1)Ͱௐͯ෧ҹ͠Α͏ʂ ➡ ➡
ং൫ͷ·ͱΊ wίϯςφಛघͳϓϩηεͱߟ͑Ε0, wϓϩηεΛϗετ͔ΒִɺϦιʔεΛ੍ݶɺݖݶΛηΩϡΞʹߜΓ ࠐΉ͜ͱͰɺ࣮࣭7.తಠཱڥͱ͢Δͷ͕جຊతͳߟ͑ํ wόϥόϥͷγεςϜίʔϧΛGPSLͱFYFDͷؒͰࣗͰݺͼग़ͤɺί ϯςφ͔ͨ͠ϓϩηεΛࣗ࡞͢Δ͜ͱͰ͖Δ
งғؾ௫Ί͔ͨͳʁ
งғؾͰίϯ ςφͷΤίγ εςϜΛཧղ
ίϯςφ༻ޠ
ίϯςφ༻ޠ %PDLFS -9$ -9% .PCZ ,VCFSOFUFT 'MBOOFM SVOD (,& &$4
"$* 0$* 5FDUPOJD $PSF04 )BDPOJXB SLU SBJMDBS $BMJDP /PNBE 4XBSN
ଟ͘ͳ͍ʁ
આ໌Ͱ͖·͔͢ʁ
ϨΠϠͰߟ͑ͯΈΔ SVOD %PDLFS -9$ -9% )BDPOJXB .PCZ SLU ,VCFSOFUFT 'MBOOFM
$BMJDP 4XBSN /PNBE SBJMDBS $3*0 $POUBJOFSE
ิॿઢΛҾ͜͏ SVOD %PDLFS -9$ -9% )BDPOJXB .PCZ SLU ,VCFSOFUFT 'MBOOFM
$BMJDP 4XBSN /PNBE SBJMDBS $3*0 $POUBJOFSE 0$* 4QFD $3*
0$* 0QFO$POUBJOFS*OJUJBUJWF
0$*ͱ wίϯςφͷ৭ʑͳنɾن֨Λඪ४Խ͍ͯ͠Δஂମ w0$*ͷنʹ४ڌ͢ΔͱԿ͕خ͍͔͠ʁ wΠϝʔδͷϑΥʔϚοτ͕౷Ұ͞Ε͍ճ͠Ͱ͖Δ w04͝ͱʹඞཁͳύϥϝʔλ͕ཧ͞ΕͯࣗͰඞཁͳϥϯλΠϜΛ ࣮Ͱ͖ͨΓ͢Δ w࣮ͨ͠ϥϯλΠϜΛ֎෦πʔϧͱ࿈ܞ͢Δͷ༰қʹͳΔ
ʢ·ͨʣ%PDLFSϑΝϛϦͰߟ͑ͯΈΑ͏ EPDLFSίϚϯυͰίϯςφΛ্ཱͪ͛ΔͱɺΊͪΌ໊͍લ ͷϓϩηε͕Ͱ͖ͯɺͦͷԼʹ࣮ࡍͷίϯςφͷ1*%ίϚϯ υ͕ੜ͑Δ͜ͱ͕Θ͔ΔɻSVODͱ͍͏Ωʔϫʔυ͕ݟ͑Δɻ
SVODͷϨΠϠʔՄͰ͋Δ w0$*ͷنͲ͓Γͷ࣮Λͨ͠ίϯςφϥϯλΠϜͰ͋Εɺ ͦΕΛ%PDLFSͷΠϯλʔϑΣʔε͔Βૢ࡞ͯ͠ίϯςφΛ࡞ΕΔ wͦͷ͋ͨΓΛDPOUBJOFSE EPDLFS ͰEPDLFSDPOUBJOFSETIJNͱ͍ ͏ϓϩάϥϜ͕୲͍ͬͯΔ
͍֮͑ͯ·͔͢ɺSBJMDBS w0SBDMFͷίϯςφϥϯλΠϜɺࠓͷτʔΫେگɾ3VTU w%PDLFSͷϥϯλΠϜʹSBJMDBSΛ͏Α͏ʹࢦఆՄೳ wSBJMDBSͰίϯςφΛ্ཱͪ͛ΔΑ͏ʹΦϓγϣϯΛೖΕΔ FEHFͷͰ͔͠ಈ͔ͳ͍ͷͰͦΕʹΞοϓάϨʔυ͓ͯ͘͠ ExecStart=/usr/bin/dockerd -H fd:// --experimental \
--add-runtime "rc=/usr/local/bin/railcar"
SBJMDBSΛ%PDLFSͰ͑Δ
$3* $POUBJOFS3VOUJNF*OUFSGBDF
͜ͷ ,VCFSOFUFT ʹؔͯ͠ wૉਓͳΜͰ͕͢ w͍͢·ͤΜɺશൠతʹงғؾͳΜͰ͕͢ wؒҧ͍ͬͯͨΒ͝ࢦఠ͓ئ͍͠·͢ʂ 8BSOJOH
NJOJDVCFͳͲͰαΫοͱLTڥΛ w࡞ͬͯΈΔ wNJOJLVCFTTIͰೖΔͱɺવEPDLFSϓϩηε͕ଘࡏ͍ͯ͠ΔͰ͢Ͷ wຬͨ͠ͷͰ ͜ͷڥফ͠·͢
ࠓɺΦϓγϣϯΛม͑Δ wҎԼͷΦϓγϣϯͰNJOJLVCFTUBSU͢Δ wʢ্ख͘ಈ͔ͳ͍࣌Ұ୴NJOJLVCFTUPQΦϓγϣϯແ͠Ͱ NJOJLVCFTUBSUʣ $ minikube start \ --network-plugin=cni \
--container-runtime=cri-o \ --bootstrapper=kubeadm
DSJP ͍ͬͯ͏ͭʁ w͕͍Δ w͍ͭ͜୭ͩ
DSJPSLUMFUͳͲͳͲ w$3*ͱɺ,VCFSOFUFT͔Βར༻͢ΔͨΊʹඞཁͳΠϯλϑΣʔεͷ ༷ͷࣄͰɺH31$Λ͍ͬͯΔ w$3*ϓϩτίϧΛΔσʔϞϯΛ্ཱͪ͛Δ͜ͱͰɺόοΫΤϯυͷ ࣮ʹؔͳ͘LVCFDUMͰಉ͡Α͏ʹΫϥελΛߏஙՄೳɻ wDSJPίϯςφϓϩηεΛ্ཱͪ͛ΔϥϯλΠϜʹSVODΛ͏ wSLUMFUίϯςφϓϩηεΛ্ཱͪ͛ΔϥϯλΠϜʹSLUΛ͏
͜͜·Ͱͷ·ͱΊ w0$*ͱ͍͏ஂମͷ࡞ͬͨنʹԊͬͯίϯςφϥϯλΠϜΛ࡞Δͱศ ར w$3*ͱ͍͏نʹԊ࣮ͬͨͰίϯςφϥϯλΠϜΛ࡞Δͱศར w͜ΕΒͷنͰίϯςφϥϯλΠϜͨͪΛઢҾ͖͢Δ͜ͱ͕Ͱ͖Δ
ṖͷਤΛՃͯ͠࠶ܝ SVOD -9$ -9% )BDPOJXB .PCZ SLU ,VCFSOFUFT 'MBOOFM $BMJDP
4XBSN /PNBE SBJMDBS $3*0 $POUBJOFSE 0$* 4QFD $3* ,FSOFMTZTDBMM
ṖͷਤΛՃͯ͠࠶ܝ SVOD -9$ -9% )BDPOJXB .PCZ SLU ,VCFSOFUFT 'MBOOFM $BMJDP
4XBSN /PNBE SBJMDBS $3*0 $POUBJOFSE 0$* 4QFD $3* ,FSOFMTZTDBMM ʮϥϯλΠϜʯͱ͍͏ݺͼํͰ͜ͷ྆ํͷൣғΛࢦ͍ͯ͠Δ ͷͰΊͪΌࠞཚ͢ΔɻͲͪΒͷׂ͔ҙࣝ͢Δͱ٢
ṖͷਤΛՃͯ͠࠶ܝ SVOD -9$ -9% )BDPOJXB .PCZ SLU ,VCFSOFUFT 'MBOOFM $BMJDP
4XBSN /PNBE SBJMDBS $3*0 $POUBJOFSE 0$* 4QFD $3* ,FSOFMTZTDBMM %PDLFS͜͜Λ ·ͱΊͯར༻͢ΔԿ͔
ṖͷਤΛՃͯ͠࠶ܝ SVOD -9$ -9% )BDPOJXB .PCZ SLU ,VCFSOFUFT 'MBOOFM $BMJDP
4XBSN /PNBE SBJMDBS $3*0 $POUBJOFSE ,FSOFMTZTDBMM -9$-9%ʹؔͯ͠ɺ0$*ͱ·ͨผ͕ͩɺ ͬ͘͟Γ-9$͕ΧʔωϧΓͱΓɺ-9%͕)551"1*Λ୲ )BDPOJXB͜Ε͔Β)551 5$1 JOUFSGBDFΛ࡞Γ·͢
࠷ޙͷϨΠϠʔ͚ SVOD -9$ -9% )BDPOJXB .PCZ SLU ,VCFSOFUFT 'MBOOFM $BMJDP
4XBSN /PNBE SBJMDBS $3*0 $POUBJOFSE 0$* 4QFD $3* ,FSOFMTZTDBMM
ίϯςφͷωοτϫʔΫઃఆ wز͔ͭઓུ͕͋Δɻ w ΫϥελϦϯά͠ͳ͍ wϗετϚγϯʹͱͲ·ΔͳΒɺ%PDLFSͷσϑΥϧτͰߏΘͳ͍ w ࣗྗͰWYMBOͳΓΛߏஙͯ͠ؤுΔ wίϯςφ͕͏ϒϦοδͳͲࣗͰҾͬுͬͯؤுͬͯؤுΔ w $/*ʹԊͬͨϓϥάΠϯΛར༻͢Δ
$/* $POUBJOFS/FUXPSL*OUFSGBDF
$/*ͱ w͜Ε·ͨɺ0QFO$POUBJOFS*OJUJBUJWFͷఆΊͨίϯςφͷωοτ ϫʔΫͷن w,VCFSOFUFTͰར༻Ͱ͖Δ wOFUXPSLQMVHJODOJͰىಈ͠ɺϚχϑΣετͰ$/*ͷ+40/ͱ γεςϜίϯςφͦͷଞΛྲྀ͠ࠐΉ wϚχϑΣετΛྲྀ͠ࠐΉͱɺϗετ/etc/cni/net.dʹઃఆ͕ೖ ΓɺඞཁͳγεςϜίϯςφ্ཱ͕͕ͪΓ༗ޮʹͳΔ
qBOOFMͷྫ wqBOOFMWYMBO -PWFS- Λ࣮ݱ͢ΔσʔϞϯ wࣗͰΜͰ͍͍͚Ͳɺ $/*ϓϥάΠϯ͕͋Δ $ kubectl apply -f
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-f calico.yaml
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ͦΕʹ தΛ͔ͬ͠Γཧղ͢Δ͜ͱ ָ͍͠ʢͣʣ
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