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ۙ౻Ӊஐ࿕(.01FQBCP *OD !)BDLFS5BDLMF શવΘ͔Βͳ͍ɻ Զͨͪ͸งғؾͰ ίϯςφΛ΍ͬͯ
 ͍Δ

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ۙ౻Ӊஐ࿕!VE[VSB &$αʔϏεɺΦϯϥΠϯήʔϜ։ൃͳͲΛܦͯɺ ೥ΑΓ(.0ϖύϘٕज़ج൫νʔϜɻಉ೥Α Γ෱Ԭࢢ಺ʹҠॅɻڞஶʹʰύʔϑΣΫτ3VCZʱ ʰύʔϑΣΫτ3BJMTʱͳͲ͕͋ΔɻNSVCZΛ૊Έ ࠐΜͩ-JOVYίϯςφϥϯλΠϜʮ)BDPOJXBʯͷ ࡞ऀɻ)BDPOJXBؔ࿈ͷ׆ಈͱͯ͠ɺ3VCZ,BJHJ ͰͷτʔΫ͕࠾୒͞Εɺ·ͨ౳ιϑτ΢ΣΞ Ͱୈճ෱Ԭ3VCZେ৆Λड৆ɻݱࡏ͸ɺ)BDPOJXB Λϕʔεͱͨ͠Ϋϥ΢υαʔϏεͰ͋ΔʮϩϦϙο ϓʂϚωʔδυΫϥ΢υʯʹࣾ಺ٕज़ސ໰ ͱ͠ ͯࢀՃ͍ͯ͠Δɻ

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ࠓ೔ͷ͓࿩ w งғؾͰίϯςφͷத਎Λཧղ͢Δ w งғؾͰίϯςφͷΤίγεςϜΛཧղɹ w งғؾͰίϯςφΛࣗ࡞͢Δʹ͸ w ͳΜͳΜͩΑʂงғؾͬͯʂʢ·ͱΊʣ

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งғؾͰίϯ ςφͷத਎Λ ཧղ͢Δ

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ίϯςφԾ૝Խ

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ίϯςφɺ ࡞ͬͨ͜ͱ͋Γ·͔͢ʁ

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͡Ό͋࡞ͬͯΈ·͠ΐ͏͔

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%PDLFSΛྫʹ͠·͢ wී௨ͷ-JOVY 6CVOUV#JPOJD ʹ%PDLFSΛೖΕͯɺෳ਺ݸίϯςφΛ ࡞ͬͯΈΔɻ $ docker run --rm -d debian:latest /bin/sleep 99 d003ac5389a1631d789f5d1b77bf201adc517ad9acc91bd5...

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࠷ۙ DF ͷ%PDLFS w͜͜ͰɺΈͳ͞Μ͓ೃછΈͷQTίϚϯυΛൃߦͯ͠Έ·͠ΐ͏ w;Ή;Ή

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ίϯςφͷTMFFQίϚϯυ͸ ϗετϚγϯ͔Β ௨ৗͷϓϩηεͷΑ͏ʹݟ͑·͢

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ͭ·Γ

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ίϯςφ͸ϓϩηεͳΜ ͩʂʂʂʂʂʂʂʂʂʂʂʂʂʂʂʂ ʂʂʂʂʂʂʂʂʂʂ

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ίϯςφʮԾ૝Խʯͬͯݴ͏͚ΕͲ wίϯςφͷ࣮ݱʹ͓͍ͯ͸ɺϋʔυ΢ΣΞͷԾ૝Խʢ$16ɺϝϞϦͳ Ͳʣ͸ߦ͍ͬͯͳ͍͜ͱʹ஫ҙɻ wEPDLFSSVOFYFDͳͲͰʮಠཱͨ͠-JOVYͷ؀ڥʹೖΔʯ͜ͱ͕ग़དྷ ΔɻͦͷΑ͏ʹಠཱͨ͠؀ڥΛ࡞ΕΔ͜ͱࣗମΛࢦͯ͠ɺʮԾ૝Խʯ ͱݺΜͰ͍Δͱ΋ݴ͑Δɻ wٯʹϓϩηεͳͷͰɺͦͷଞͷԾ૝Խख๏ΑΓ΋ܰྔͩ͠ɺΑΓࡉ͔ ੍͍ޚ͕ՄೳʹͳΔଆ໘΋͋Δɻ

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DGͦͷଞͷԾ૝Խ wϗετܕ͋Δ04ʹɺઐ༻ͷιϑτ΢ΣΞΛೖΕͯԾ૝Խ͢Δ wϋΠύʔόΠβܕԾ૝Խઐ༻ͷ04ͷ্Ͱ7.Λ্͛Δ wͳͲͳͲɺ࣮ݱͷํࣜ͸ز͔ͭ͋Δ͕ɺಛ௃ͱͯ͠ɺϋʔυ΢ΣΞͷ Ծ૝ԽΛߦ͏ɻͦͷͨΊ04ͷछྨ͸ࣗ༝ʹͳΔ͕ɺίϯςφΑΓ΋ Φʔόʔϔου͕େ͖͘ͳΔɻ

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ϓϩηε͕ίϯςφԽ͍ͯ͠Δ͔ௐ΂Δ wΈΜͳ/procͷ͜ͱศརʹ׆༻ͯ͠·͢ΑͶʁ w/proc/PID/*ʹଘࡏ͢ΔϑΝΠϧʹ͍ͭͯɺී௨ͷϓϩηεͷ΋ͷ ͱʮίϯςφԽͨ͠ʯͷ΋ͷΛൺֱ͢Δͱɺز͔ͭͷଐੑ͕ҟͳͬͯ ͍Δ͜ͱ͕Θ͔Δɻ w/proc/PID/ns,
 /proc/PID/cgroup,
 /proc/PID/status,
 

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ʮίϯςφԽʯ͢ΔͨΊͷ -JOVYͷػೳ

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-JOVY/BNFTQBDF

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QSPD1*%OT͕ҧ͏ wΑ͘ݟΔͱҧ͏ wVUTͱ͔JQDͱ͔NOUͱ͔
 ͍Ζ͍Ζ͋Δ w͜ΕΒ͸ɺάϩʔόϧͳ໊લۭؒͱ͸ผͷ04ϦιʔεΛׂΓ౰ͯΒ Ε͍ͯΔ͜ͱΛҙຯ͢Δɻͦ͏͍͏໊લۭؒΛ-JOVY/BNFTQBDFͱ ݺΜͰ͍Δɻ wྫ͑͹654/BNFTQBDFάϩʔόϧͳϗετ໊ͱ͸ಠཱͨ͠ϗετ໊Λ࣋ͯΔ

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ίϯςφͷωοτϫʔΫʹʮೖΔʯ wOTFOUFSͱ͍͏ίϚϯυͰ-JOVY/BNFTQBDFʹೖΔ͜ͱ͕Ͱ͖Δɻ wEPDLFSFYFDͱൺֱͯ͠ΈΑ͏ $ sudo nsenter \ --net=/proc/$( \ docker inspect hackertackle_1 -f ‘{{.State.Pid}}' \ )/ns/net

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EPDLFSFYFD OTFOUFS

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DHSPVQ

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DHSPVQͱ͸ wDHSPVQ $POUSPM(SPVQ ͱ͸ɺ೚ҙͷϓϩηεΛάϧʔϐϯάͰ͖Δ ػೳɻͨͩάϧʔϓʹ͢Δ͚ͩͰͳ͘ɺͦͷάϧʔϓ͝ͱʹ04ͷϋʔ υ΢ΣΞͳͲͷϦιʔεΛ੍ݶɺ͋Δ͍͸౷ܭ৘ใΛऔಘͰ͖Δɻ wྫ w$16ͷ੍ݶάϧʔϓશମͷ$16ར༻཰Λ/ʹԡ͑ͨ͞ΓɺίΞΛ ݻఆͨ͠ΓͰ͖Δɻ·ͨ$16࣌ؒͷ౷ܭ΋Θ͔Δ wϝϞϦͷ੍ݶάϧʔϓશମͰ࢖͏ϝϞϦར༻ঢ়گΛ੍ݶɺܭଌͰ͖ Δɻݶքʹୡͨ࣌͠ͷڍಈ΋બ΂Δ

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QJETαϒγεςϜ wͦͷάϧʔϓʹॴଐ͢Δϓϩηε਺Λ੍ݶͰ͖Δɻ wDHSPVQ͸ಛఆͷϑΝΠϧʹॻ͖ࠐΉ͜ͱͰγϡοͱ࢖͑Δɻ ݸʹ੍ݶ

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ͦͷάϧʔϓʹॴଐ͢Δϓϩηε਺Λ ੍ݶͰ͖Δ ʹ GPSLCPNCରࡦ͕Ͱ͖Δ

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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 ...

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ੜؐ

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ͦͷଞͷػೳ wDISPPUQJWPU@SPPU͋ΔαϒσΟϨΫτϦʹೖΓࠐΉ wSMJNJUVMJNJUͷ΍ͭ w,FSOFM$BQBCJMJUZSPPUͷݖݶΛ෼ׂͯ͠Ұ෦Λ෇༩ɺୣ͏ wTFDDPNQγεςϜίʔϧͷϑΟϧλϦϯά w."$ BQQBSNPS4&-JOVY50.0:0ଞ

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TFDDPNQͷྫ wίϯςφ಺෦ͰɺNLEJSίϚϯυͰ࢖͏γεςϜίʔϧ ʢmkdir(2)ʣ΍DIPXOίϚϯυͰ࢖͏΍ͭʢchownat(2)ʣͷݺͼ ग़͠ΛϑΟϧλʔ͢Δ͜ͱ͕Ͱ͖Δɻͨͱ͑SPPUͰ΋౰֘ૢ࡞͕ෆՄ ೳʹɻ޷͖ͳίϚϯυΛstrace(1)Ͱௐ΂ͯ෧ҹ͠Α͏ʂ ➡ ➡

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ং൫ͷ·ͱΊ wίϯςφ͸ಛघͳϓϩηεͱߟ͑Ε͹0, wϓϩηεΛϗετ͔Βִ཭ɺϦιʔεΛ੍ݶɺݖݶΛηΩϡΞʹߜΓ ࠐΉ͜ͱͰɺ࣮࣭7.తಠཱ؀ڥͱ͢Δͷ͕جຊతͳߟ͑ํ wόϥόϥͷγεςϜίʔϧΛGPSLͱFYFDͷؒͰࣗ෼Ͱݺͼग़ͤ͹ɺί ϯςφ͔ͨ͠ϓϩηεΛࣗ࡞͢Δ͜ͱ΋Ͱ͖Δ

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งғؾ͸௫Ί͔ͨͳʁ

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งғؾͰίϯ ςφͷΤίγ εςϜΛཧղ

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ίϯςφ༻ޠ

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ίϯςφ༻ޠ %PDLFS -9$ -9% .PCZ ,VCFSOFUFT 'MBOOFM SVOD (,& &$4 "$* 0$* 5FDUPOJD $PSF04 )BDPOJXB SLU SBJMDBS $BMJDP /PNBE 4XBSN

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ଟ͘ͳ͍ʁ

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આ໌Ͱ͖·͔͢ʁ

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ϨΠϠͰߟ͑ͯΈΔ SVOD %PDLFS -9$ -9% )BDPOJXB .PCZ SLU ,VCFSOFUFT 'MBOOFM $BMJDP 4XBSN /PNBE SBJMDBS $3*0 $POUBJOFSE

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ิॿઢΛҾ͜͏ SVOD %PDLFS -9$ -9% )BDPOJXB .PCZ SLU ,VCFSOFUFT 'MBOOFM $BMJDP 4XBSN /PNBE SBJMDBS $3*0 $POUBJOFSE 0$* 4QFD $3*

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0$* 0QFO$POUBJOFS*OJUJBUJWF

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0$*ͱ͸ wίϯςφͷ৭ʑͳن໿ɾن֨Λඪ४Խ͍ͯ͠Δஂମ w0$*ͷن໿ʹ४ڌ͢ΔͱԿ͕خ͍͔͠ʁ wΠϝʔδͷϑΥʔϚοτ͕౷Ұ͞Ε࢖͍ճ͠Ͱ͖Δ w04͝ͱʹඞཁͳύϥϝʔλ͕੔ཧ͞Εͯࣗ෼ͰඞཁͳϥϯλΠϜΛ ࣮૷Ͱ͖ͨΓ͢Δ w࣮૷ͨ͠ϥϯλΠϜΛ֎෦πʔϧͱ࿈ܞ͢Δͷ΋༰қʹͳΔ

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ʢ·ͨʣ%PDLFSϑΝϛϦͰߟ͑ͯΈΑ͏ EPDLFSίϚϯυͰίϯςφΛ্ཱͪ͛ΔͱɺΊͪΌ௕໊͍લ ͷϓϩηε͕Ͱ͖ͯɺͦͷԼʹ࣮ࡍͷίϯςφͷ1*%ίϚϯ υ͕ੜ͑Δ͜ͱ͕Θ͔ΔɻSVODͱ͍͏Ωʔϫʔυ͕ݟ͑Δɻ

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SVODͷϨΠϠʔ͸Մ׵Ͱ͋Δ w0$*ͷن໿Ͳ͓Γͷ࣮૷Λͨ͠ίϯςφϥϯλΠϜͰ͋Ε͹ɺ
 ͦΕΛ%PDLFSͷΠϯλʔϑΣʔε͔Βૢ࡞ͯ͠ίϯςφΛ࡞ΕΔ wͦͷ͋ͨΓΛDPOUBJOFSE EPDLFS Ͱ͸EPDLFSDPOUBJOFSETIJNͱ͍ ͏ϓϩάϥϜ͕୲͍ͬͯΔ

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͍֮͑ͯ·͔͢ɺSBJMDBS w0SBDMFͷίϯςφϥϯλΠϜɺࠓ೔ͷτʔΫ΋େ੝گɾ3VTU੡ w%PDLFSͷϥϯλΠϜʹSBJMDBSΛ࢖͏Α͏ʹࢦఆՄೳ wSBJMDBSͰίϯςφΛ্ཱͪ͛ΔΑ͏ʹΦϓγϣϯΛೖΕΔ
 FEHFͷͰ͔͠ಈ͔ͳ͍ͷͰͦΕʹΞοϓάϨʔυ͓ͯ͘͠ ExecStart=/usr/bin/dockerd -H fd:// --experimental \ --add-runtime "rc=/usr/local/bin/railcar"

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SBJMDBSΛ%PDLFSͰ࢖͑Δ

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$3* $POUBJOFS3VOUJNF*OUFSGBDF

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͜ͷ෼໺ ,VCFSOFUFT ʹؔͯ͠͸ wૉਓͳΜͰ͕͢ w͍͢·ͤΜɺશൠతʹงғؾͳΜͰ͕͢ wؒҧ͍ͬͯͨΒ͝ࢦఠ͓ئ͍͠·͢ʂ 8BSOJOH

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NJOJDVCFͳͲͰαΫοͱLT؀ڥΛ w࡞ͬͯΈΔ wNJOJLVCFTTIͰೖΔͱɺ౰વEPDLFSϓϩηε͕ଘࡏ͍ͯ͠ΔͰ͢Ͷ wຬ଍ͨ͠ͷͰ
 ͜ͷ؀ڥ͸ফ͠·͢

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ࠓ౓͸ɺΦϓγϣϯΛม͑Δ wҎԼͷΦϓγϣϯͰNJOJLVCFTUBSU͢Δ wʢ্ख͘ಈ͔ͳ͍࣌͸Ұ୴NJOJLVCFTUPQΦϓγϣϯແ͠Ͱ NJOJLVCFTUBSUʣ $ minikube start \ --network-plugin=cni \ --container-runtime=cri-o \ --bootstrapper=kubeadm

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DSJP ͍ͬͯ͏΍ͭʁ w͕͍Δ w͍ͭ͜͸୭ͩ

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DSJPSLUMFUͳͲͳͲ w$3*ͱ͸ɺ,VCFSOFUFT͔Βར༻͢ΔͨΊʹඞཁͳΠϯλϑΣʔεͷ ࢓༷ͷࣄͰɺH31$Λ࢖͍ͬͯΔ w$3*ϓϩτίϧΛ஻ΔσʔϞϯΛ্ཱͪ͛Δ͜ͱͰɺόοΫΤϯυͷ ࣮૷ʹؔ܎ͳ͘LVCFDUMͰಉ͡Α͏ʹΫϥελΛߏஙՄೳɻ wDSJP͸ίϯςφϓϩηεΛ্ཱͪ͛ΔϥϯλΠϜʹSVODΛ࢖͏ wSLUMFU͸ίϯςφϓϩηεΛ্ཱͪ͛ΔϥϯλΠϜʹSLUΛ࢖͏

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͜͜·Ͱͷ·ͱΊ w0$*ͱ͍͏ஂମͷ࡞ͬͨن໿ʹԊͬͯίϯςφϥϯλΠϜΛ࡞Δͱศ ར w$3*ͱ͍͏ن໿ʹԊ࣮ͬͨ૷ͰίϯςφϥϯλΠϜΛ࡞Δͱศར w͜ΕΒͷن໿ͰίϯςφϥϯλΠϜͨͪΛઢҾ͖͢Δ͜ͱ͕Ͱ͖Δ

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ṖͷਤΛՃ޻ͯ͠࠶ܝ SVOD -9$ -9% )BDPOJXB .PCZ SLU ,VCFSOFUFT 'MBOOFM $BMJDP 4XBSN /PNBE SBJMDBS $3*0 $POUBJOFSE 0$* 4QFD $3* ,FSOFMTZTDBMM

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ṖͷਤΛՃ޻ͯ͠࠶ܝ SVOD -9$ -9% )BDPOJXB .PCZ SLU ,VCFSOFUFT 'MBOOFM $BMJDP 4XBSN /PNBE SBJMDBS $3*0 $POUBJOFSE 0$* 4QFD $3* ,FSOFMTZTDBMM ʮϥϯλΠϜʯͱ͍͏ݺͼํͰ͜ͷ྆ํͷൣғΛࢦ͍ͯ͠Δ
 ͷͰΊͪΌࠞཚ͢ΔɻͲͪΒͷ໾ׂ͔ҙࣝ͢Δͱ٢

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ṖͷਤΛՃ޻ͯ͠࠶ܝ SVOD -9$ -9% )BDPOJXB .PCZ SLU ,VCFSOFUFT 'MBOOFM $BMJDP 4XBSN /PNBE SBJMDBS $3*0 $POUBJOFSE 0$* 4QFD $3* ,FSOFMTZTDBMM %PDLFS͸͜͜Λ ·ͱΊͯར༻͢ΔԿ͔

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ṖͷਤΛՃ޻ͯ͠࠶ܝ SVOD -9$ -9% )BDPOJXB .PCZ SLU ,VCFSOFUFT 'MBOOFM $BMJDP 4XBSN /PNBE SBJMDBS $3*0 $POUBJOFSE ,FSOFMTZTDBMM -9$-9%ʹؔͯ͠͸ɺ0$*ͱ΋·ͨผ͕ͩɺ ͬ͘͟Γ-9$͕Χʔωϧ΍ΓͱΓɺ-9%͕)551"1*Λ୲౰ )BDPOJXB͸͜Ε͔Β)551 5$1 JOUFSGBDFΛ࡞Γ·͢

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࠷ޙͷϨΠϠʔ෼͚ SVOD -9$ -9% )BDPOJXB .PCZ SLU ,VCFSOFUFT 'MBOOFM $BMJDP 4XBSN /PNBE SBJMDBS $3*0 $POUBJOFSE 0$* 4QFD $3* ,FSOFMTZTDBMM

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ίϯςφͷωοτϫʔΫઃఆ wز͔ͭઓུ͕͋Δɻ w ΫϥελϦϯά͠ͳ͍ wϗετϚγϯʹͱͲ·ΔͳΒɺ%PDLFSͷσϑΥϧτͰߏΘͳ͍ w ࣗྗͰWYMBOͳΓΛߏஙͯ͠ؤுΔ wίϯςφ͕࢖͏ϒϦοδͳͲ΋ࣗ෼ͰҾͬுͬͯؤுͬͯؤுΔ w $/*ʹԊͬͨϓϥάΠϯΛར༻͢Δ

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$/* $POUBJOFS/FUXPSL*OUFSGBDF

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$/*ͱ͸ w͜Ε΋·ͨɺ0QFO$POUBJOFS*OJUJBUJWFͷఆΊͨίϯςφͷωοτ ϫʔΫͷن໿ w,VCFSOFUFTͰ΋ར༻Ͱ͖Δ wOFUXPSLQMVHJODOJͰىಈ͠ɺϚχϑΣετͰ$/*ͷ+40/ͱ
 γεςϜίϯςφͦͷଞΛྲྀ͠ࠐΉ wϚχϑΣετΛྲྀ͠ࠐΉͱɺϗετ/etc/cni/net.dʹઃఆ͕ೖ ΓɺඞཁͳγεςϜίϯςφ্ཱ͕͕ͪΓ༗ޮʹͳΔ

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qBOOFMͷྫ wqBOOFM͸WYMBO -PWFS- Λ࣮ݱ͢ΔσʔϞϯ wࣗ෼Ͱ૊ΜͰ΋͍͍͚Ͳɺ
 $/*ϓϥάΠϯ͕͋Δ $ kubectl apply -f kube-flannel.yml ʮqBOOFMΛ࢖ͬͯ-JOVYͰ࣮ݱ͢ΔWYMBOͷ͞ΘΓΛ஌Δʯ IUUQTRJJUBDPNVE[VSBJUFNTCEEBGBCEG

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DBMJDPͷྫ w1SPKFDU$BMJDP͸-ͷΈͰ࣮ݱ͍ͯ͠Δ
 εέʔϥϒϧͳωοτϫʔΫΛఏڙ͢Δ
 ϓϩδΣΫτɻ#(1Λར༻͍ͯ͠Δ w ʮ:BIPP+"1"/.FFU6QʢΠϯϑϥٕज़ΧϯϑΝϨϯεʣηογϣϯᶆʯ
 IUUQTXXXTMJEFTIBSFOFUUFDICMPHZBIPPZBIPPKBQBONFFUVQ $ kubectl apply -f calico.yaml

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