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Docker Pre Hands-on
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Daisuke Baba
August 13, 2014
Technology
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Docker Pre Hands-on
Dockerハンズオン前の知識編
Daisuke Baba
August 13, 2014
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Transcript
DockerϋϯζΦϯલ ४උ
[email protected]
Aug. 25 2014 Friday, August 29, 14
Docker • OS (linux)ϨϕϧͷԾԽͰɺLinux KernelΛڞ༗ͨ͠· ·CPUͳͲͷϦιʔεΛίϯςφͱ͍͏୯ҐͰ۠Δ͜ ͱ͕Ͱ͖ΔLXC(Linux Containers)ͱ͍͏ٕज़͕ݩωλɻ LXCͷৄࡉWikipedia •
ԼهͷهࣄDockerͷαΠτΛઌʹݟ͓͍͍ͯͯͩ͘͞ http://www.atmarkit.co.jp/ait/articles/1405/16/ news032.html https://www.docker.com/ Friday, August 29, 14
ຊͷ༰ • DockerͱVagrantͷൺֱ • DockerͱLXCͷҧ͍ • DockerΛOSX/WinͰ͏ • Docker Private
RegistryͱDocker Hub • DockerͰͷయܕతͳ࡞ۀ • Docker/Boot2docker͋Δ͋Δ Friday, August 29, 14
DockerVagrantͱ Կ͕ҧ͏ʁ - Host OS Guest OS Virtualizat ion Πϝʔδ
୯Ґ Docker Linux Linux LXC ίϯςφ Vagrant Linux/BSD/ Windows/ OSX etc. Linux/BSD/ Windows etc. VirtualBox /VMWare/ etc. Ծ Ϛγϯ Friday, August 29, 14
DockerͱVagrantͷ ͍͚ʁ • Docker • LinuxΛ͏ͳΒجຊͪ͜Βɻkernel cgroupnamespaces ͱ͍͏ΈʹΑͬͯϦιʔε੍ޚɾִ͕ͳ͞ΕɺΑ ΓϨϕϧͰͷԾԽΛߦ͏VirtualBoxͳͲΑΓޮ తʹϦιʔεͷִΛߦ͑Δ
• Vagrant • LinuxҎ֎Λ͏ͱ͖ • ग़యɿStackOverflow (http://stackoverflow.com/a/16761439) Friday, August 29, 14
DockerͱLXCͷҧ͍ • LXCʹൺͯԼهͷΛڧԽ͍ͯ͠Δͷ͕Docker • Ҡ২ੑɿDocker͑͞ಈ͚ίϯςφͲ͜Ͱಈ͘ • ΞϓϦσϓϩΠతɿԾϚγϯΛಈ͔͢ͷ͕తͰͳ͍ • ΠϝʔδϏϧυͷΈɿίϯςφΠϝʔδΛ࡞ΔΈΛఏڙ͍ͯ͠ΔɻͰΠ ϝʔδΛ࡞ΔͨΊͷπʔϧͳ͍ͷͰɺ֤ࣗγΣϧͳͲͰ༻ҙ͢Δ͜ͱ
• ࠩཧɿཤྺͱͱʹΠϝʔδΛࠩͰཧ͍ͯ͠Δ • Πϝʔδͷ࠶ར༻ɿࠩཧΛར༻ͯ͠ੜΠϝʔδΛ࡞Δ͜ͱ͕Ͱ͖Δ • ڞ༗ɿDockerHubͰΠϝʔδΛڞ༗ • πʔϧͷΤίγεςϜɿ৭ʑͭͳ͕Δπʔϧ͕͋Δ • ਖ਼֬ͳઆ໌ͪ͜Β→DockerͷFAQ (https://docs.docker.com/faq/) Friday, August 29, 14
DockerΛOSX/WinͰ͏ • Boot2dockerͱ͍͏ԾϚγϯΛ͏ • LinuxͰͳ͚ΕDockerಈ࡞͠ͳ͍ͷ Ͱɺগͳ͘ͱLinuxڥΛ༻ҙ͠ͳ͍ ͱ͍͚ͳ͍ →ͳͷͰBoot2dockerͱ͍͏Linuxڥ͕ ඞཁͱͳͬͨ Friday,
August 29, 14
Boot2docker • VirtualBoxͳͲͰಈ࡞͢Δ • TinyCore Linux(TCL)ͱ͍͏ΈࠐΈLinuxͰ͓ͳ͡Έͷ LinuxΛ༻ • UNIXίϚϯυɺBusyBoxʢ௨শɺΈࠐΈLinuxͷΞʔ ϛʔφΠϑʣͱ͍͏ػೳݶఆ൛͕ೖ͍ͬͯΔ
• TCLࣗମϑοτϓϦϯτ͕ͱͯখ͘͞Ͱ͖Δ͏͑ (20~40MB)ɺىಈ͕ૣ͍ • Boot2dockerISOϑΝΠϧͰ20MB Friday, August 29, 14
Boot2dockerΛೖख͢Δ • WindowsΠϯετʔϥʔ • https://github.com/boot2docker/windows-installer • OSXΠϯετʔϥʔ • https://github.com/boot2docker/osx-installer •
export DOCKER_HOST=tcp:// 192.168.59.103:2375 Λࢦఆ͢Δͱಁաతʹར༻Ͱ͖Δ(೦ͳ͕Β OSXͷΈ) Friday, August 29, 14
Docker HubͱϓϥΠϕʔτ ϨδετϦ • Docker Hub • ίϯςφΠϝʔδΛڞ༗Ͱ͖Δ • ࣗͰϏϧυ͠ͳͯ͘Α͍͚ͲɺDL͕ඞཁ
• Dockerར༻ऀͰڞ༗͢Δ • GitHubͷΑ͏ͳͷɻιʔεͷΘΓʹΠϝʔδΛڞ༗͢Δ • ϓϥΠϕʔτϨδετϦ • ݶఆͨ͠ൣғͰΠϝʔδΛڞ༗Ͱ͖Δ • ӬଓԽ෦ΛS3ͳͲ৭ʑબͰ͖Δ Friday, August 29, 14
DockerϨδετϦ Private Object Storage (S3/Azure Storage/etc.) Docker Registry Container Docker
Private Registry Listening on localhost:5000 Docker Hub hub.docker.com Friday, August 29, 14
DockerϨδετϦ Private Object Storage (S3/Azure Storage/etc.) Docker Registry Container Docker
Private Registry Listening on localhost:5000 Docker Hub hub.docker.com શར༻ऀͰ ڞ༗͢ΔϦϙδτϦ Friday, August 29, 14
DockerϨδετϦ Private Object Storage (S3/Azure Storage/etc.) Docker Registry Container Docker
Private Registry Listening on localhost:5000 Docker Hub hub.docker.com ಛఆͷൣғ ʢࣾͳͲʣͰڞ༗͢ΔϦ ϙδτϦ Friday, August 29, 14
DockerϨδετϦ Private Object Storage (S3/Azure Storage/etc.) Docker Registry Container Docker
Private Registry Listening on localhost:5000 Docker Hub hub.docker.com ϓϥΠϕʔτ ϨδετϦͷ࣮ࡍͷอ ଘॴ Friday, August 29, 14
DockerͰͷ࡞ۀ • DockerΛར༻͢Δ࡞ۀͷయܕ • ΠϝʔδΛ࡞Δ→Docker༻ޠͰϏϧυͱ͍͏ɻbuildίϚϯυ • ίϯςφΛىಈ͢Δ→runίϚϯυ • ίϯςφଓ͢Δ→attachίϚϯυ •
ίϯςφΛࢭΊΔ→killίϚϯυ • ఀࢭͨ͠ίϯςφΛࣺͯΔ→rmίϚϯυ • ΠϝʔδΛࣺͯΔ→rmiίϚϯυ • ىಈதɾఀࢭதͷίϯςφΛΈΔ→ps/inspectίϚϯυ Friday, August 29, 14
Docker͋Δ͋Δ • ίϯςφ͕͙͢ࢭ·Δ • CMDΤϯτϦϙΠϯτͷϓϩηε͕ऴΘͬͯ͠·͏ ͔όοΫάϥϯυʹೖͬͯ͠·͏͜ͱʹΑΓى͜Δ • ϑΥΞάϥϯυϓϩηεͰಈ͔͢Α͏ʹͨ͠Γɺrun ίϚϯυʹͯ-iҾͰඪ४ೖྗΛৗʹΞλονͨ͠ ΓɺrunίϚϯυʹͯɺ/bin/sh
-c /bin/shͳͲͱ͢Δํ๏ ͋Δʢ໌ࣔతʹγΣϧΛىಈ͢Δํ๏ʣɻίϯςφ ͰϝϯςΛ͢ΔͳͲಛघͳ༻్Ҏ֎Βͳ͍͜ͱ Friday, August 29, 14
Docker͋Δ͋Δ • ίϯςφΛΞλονͯ͠Կى͜Βͳ͍ • γΣϧΛίϯςφͰىಈ͍ͯ͠Δ߹ɺ ΤϯλʔΛԡͤγΣϧ͕ग़ͯ͘Δ • γΣϧҎ֎ͷ߹ɺඪ४ೖྗΛѻ͍ͬͯ ͳ͍߹ɺΩʔϘʔυೖྗʹԠ͠ͳ͍ ͨΊݻ·ͬͨΑ͏ʹͳΔ
→ͦͷ߹ɺCtrl + P, Qͱͯ͠ Friday, August 29, 14
Docker͋Δ͋Δ • ίϯςφΛΞλονͯ͠Ctrl+Cͯ͠ ͢Δͱίϯςφ͕ࢭ·Δ • Ξλονͨ͠߹ɺCtrlΛԡͨ͠· ·P→QΛԡͯ͢͠Δɻͦ͏͠ͳ ͍ͱϓϩηε͕ࢭ·ΔͷͰɺ݁Ռͱ ͯ͠ίϯςφࢭ·Δ Friday,
August 29, 14
Docker͋Δ͋Δ • ίϯςφʹSSHͨ͘͠ͳΔ • ༨ܭͳϓϩηεΛ্͛ΔͱίϯςφͷϦιʔεΛ৯͏ͷ Ͱجຊ͠ͳ͍΄͏͕Α͍ɻͰͪΖΜsshdΛ্ཱͪ͛ Δ͜ͱՄೳ • 1ίϯςφʹ1ϓϩηεΛ৺͕͚Δɻ͠ΐ͏͕ͳ͍࣌ఘ ΊΔ
• ঢ়ଶʹґଘ͠ͳ͍ίϯςφͷϑΝΠϧڥมͷΈ ؔ৺͕͋Δ߹ɺίϚϯυʹγΣϧ(/bin/sh -c /bin/bash ͳͲ)Λࢦఆͯ͠run͢ΕίϯςφͷதΛௐΒΕΔ Friday, August 29, 14
Docker͋Δ͋Δ • ίϯςφͷSyslogΛݟͨ͘ͳΔ • DockerͰར༻͢Δ߹̍ϓϩηεʹ͢Δ ͨΊʹSyslogΦϑɻͰ͏͜ͱՄೳ • DockerͷUbuntuΠϝʔδʹRsyslogd͕ ೖ͍ͬͯΔʢಈ࡞͠ͳ͍ʣͷͰONʹ͢ Εಈ͔ͤΔ
Friday, August 29, 14
Docker͋Δ͋Δ • ίϯςφϗετϚγϯͷ֎͔Βܨ͛ͨ͘ͳ Δ • runίϚϯυͰ-pΛࢦఆ͢Δ͜ͱʹΑͬͯϗ ετϚγϯͱͷϙʔτϑΥϫʔυΛࢦఆͰ ͖Δ • ग़యɿhttp://docs.docker.com/reference/run/
#expose-incoming-ports Friday, August 29, 14
Docker͋Δ͋Δ • ଞͷϗετͷίϯςφʹܨ͛ͨ͘ͳΔ • ambassador patternʹΑΓɺଞͷϗετͱͷ ΓͱΓΛઐతʹߦ͏֎ަίϯςφ Λ࡞Δํ͕ࣜਪ͞Ε͍ͯΔɻϗετ͕ ΓସΘͬͯॊೈʹରԠͰ͖ΔͨΊ •
ग़యɿhttps://docs.docker.com/articles/ ambassador_pattern_linking/ Friday, August 29, 14
Docker͋Δ͋Δ • ίϯςφΛࢭΊͨΒಉ࣌ʹΫϦʔϯͨ͘͠ͳΔ • docker killͱrmΛผʑʹߦ͏ͷ໘ • -nameͰ໊લࢦఆ͍ͯ͠ͳ͍࣌ɺawkcut ͳͲΛͬͯίϯςφIDΛಛఆ͢Δ ྫʣ
CONTAINER_ID=`docker ps | grep $1 | awk -F' ' '{ print $1 }'` docker kill ${CONTAINER_ID}; docker rm ${CONTAINER_ID} docker kill <-name>;docker rm <-name> Friday, August 29, 14
Docker͋Δ͋Δ • DockerfileͷCMDΛແࢹͯ͠ىಈ͢Δ • runίϚϯυʹͯίϚϯυΛࢦఆ͢ΕDockerfile ͷRUNࢦఆແࢹ͞ΕΔ • ͔͠͠ɺENTRYPOINTͷࢦఆΛ্ॻ͖͍ͨ࣌͠ ͜ͷํ๏Ͱͳ͘ɺ--entrypointΛ͏ ग़యɿhttp://docs.docker.com/reference/run/
#entrypoint-default-command-to-execute-at-runtime Friday, August 29, 14
Docker͋Δ͋Δ • DockerfileͷCMDͱENTRYPOINTͷҧ͍͕Θ͔Βͳ͍ • ENTRYPOINTɺίϯςφࣗମΛ͔͋ͨͻͱͭͷ࣮ߦ ϑΝΠϧͷΑ͏ʹݟͤΔͨΊͷͷ→runίϚϯυΛͬ ͨ࣌ɺΠϝʔδϑΝΠϧͷࢦఆΑΓޙΖίϚϯυͷҾ ͷΑ͏ʹѻΘΕΔ • CMDɺԿͷϑΝΠϧΛ࣮ߦ͢Δ͔Λ໌ࣔతʹࢦఆ͢Δ
͜ͱ͕Ͱ͖Δ • ग़యɿhttp://docs.docker.com/reference/run/#cmd-default- command-or-options Friday, August 29, 14
Docker͋Δ͋Δ • DBίϯςφΛམͱͯ͠ফ͢ͱσʔλফ͑Δ • ϑΝΠϧͳͲσʔλઐ༻ίϯςφΛ࡞ͯͦ͠ΕΛڞ༗͢Δ (ग़యɿhttps://docs.docker.com/userguide/dockervolumes/#creating- and-mounting-a-data-volume-container) • ͨͩͦ͠ͷίϯςφམͱͨ͠ޙrm͢Δͱσʔλফ͑Δ •
όοΫΞοϓΛऔΔ߹ɺσʔλઐ༻ίϯςφܦ༝Ͱϗετ Ϛγϯॻ͖ग़͢ͳͲ໌ࣔతͳॲཧΛߦ͏͜ͱ (ग़యɿhttps://docs.docker.com/userguide/dockervolumes/#backup- restore-or-migrate-data-volumes) Friday, August 29, 14
Docker͋Δ͋Δ • σʔλઐ༻ίϯςφͷσʔλΛόοΫΞοϓͷͨΊί ϛοτ͠Α͏ͱ͢Δ • σʔλઐ༻ίϯςφͷϚϯτϘϦϡʔϜɺΠϝʔ δมߋͷର֎ͳͷͰɺίϛοτͯ͠ҙຯ͕ͳ͍ →σʔλΒͳ͍ʂ • ໘Ͱલड़ͷͱ͓ΓݸผʹϑΝΠϧσΟϨΫτ
ϦΛόοΫΞοϓ͢Δ͜ͱ • Boot2dockerར༻࣌ɺsaveͰҰ࣌อଘͰ͖Δ Friday, August 29, 14
Docker͋Δ͋Δ • ίϯςφ͝ͱʹϩάϑΝΠϧ͕֦ࢄ͢Δ • FluentdLogStashΛ༻͍ͯऩूͷΈΛ༻ ҙ͢Δɻίϯςφʹಉډ͠ͳ͍ܗ͕·͠ ͍ →σʔλઐ༻ίϯςφʹϩάϑΝΠϧΛू ͤ͞Δͱ͍͏ํ๏͋Δ •
ElasticSearchʹू͢Δͷ͕Α͍ Friday, August 29, 14
Docker͋Δ͋Δ • ίϯςφىಈ࣌ʹଞͷίϯςφͷIPΞυϨεΛࢦఆͯ͠ى ಈ͢Δ • ܨ͍͛ͨίϯςφىಈ࣌ʹlink͓ͯ͘͠ • ͦ͏͢Δͱɺίϯςφىಈ࣌ʹڥมͰIPΞυϨε ϙʔτΛऔಘͰ͖Δ •
ىಈγΣϧ·ͨεΫϦϓτͰڥมܦ༝Ͱใ Λऔಘ͢Δ͜ͱ͕Ͱ͖Δ • ग़యɿhttps://docs.docker.com/userguide/dockerlinks/ Friday, August 29, 14
Docker͋Δ͋Δ • ଞͷίϯςφͷIPΞυϨεͰͳͯ͘ϗετ໊Ͱཧ͢Δ • ܨ͍͛ͨίϯςφىಈ࣌ʹlink͓ͯ͘͠ • ىಈ࣌ʹ/etc/hostsʹϦϯΫ࣌ͷΤΠϦΞε໊Ͱ໊લղܾͰ ͖ΔΑ͏ʹͳ͍ͬͯΔ ྫɿMySQLίϯςφΛdbͱ͍͏໊લͰϦϯΫͨ͠ͱ͖→ping dbͱ͢ΔͱIPΞυϨε͕ฦΔ
• DBͳͲʹଞίϯςφͷѼઌΛอଘ͢Δ߹͜ͷํ๏Λ औΔ • ग़యɿhttps://docs.docker.com/userguide/dockerlinks/ Friday, August 29, 14
Docker͋Δ͋Δ • linkઃఆͤͣʹࠓىಈ͍ͯ͠ΔίϯςφͷIPΛΓ ͍ͨ • SkyDNSͱSkyDockΛ͏ • ίϯςφͷىಈɾఀࢭ࣌ʹউखʹDNSઃఆͯ͠ ͘ΕΔ •
ίϯςφىಈ࣌ʹ --dnsࢦఆ͢Δ͜ͱ • ग़య:https://github.com/crosbymichael/skydock Friday, August 29, 14
Docker͋Δ͋Δ • ίϯςφΛىಈͨ࣌͠ʹIDΛมʹೖ ΕΔ(bash) • CONTAINER_ID=`docker run ....` • 12ܻͷγϣʔτIDΛͱΔʹ
SHORT_ID=${CONTAINER_ID:0:12} Friday, August 29, 14
Boot2docker͋Δ͋Δ • bashMakeͳͲ͕ૉͷ··Ͱ͑ͳ͍ • TCLͷΞϓϦཧίϚϯυͰΠϯετʔϧ͢Δ ྫʣtce-load -wi bash.tcz • tce-abίϚϯυͰରܕͷΞϓϦཧͰ͖Δ
• ͜ΕͰΠϯετʔϧͨ͠ΞϓϦboot2docker ΠϯελϯεΛऴྃͤ͞Δͱফ͑Δ Friday, August 29, 14
Boot2docker͋Δ͋Δ • GitHubͰCloneͨ͠DockerfileϓϩδΣΫτͰؔ ࿈͢ΔγΣϧ͕ΤϥʔͱͳΔ • BusyBoxલఏͰͳ͍ίϚϯυΛ͍ͬͯΔͨ Ί • ରԠͱͯ͠ɺBusyBoxͰಈ͔ͤΔΑ͏ʹ͜· Ίʹख͢͠Δ͔͠ͳ͍
ྫʣxargs -I͑ͳ͍ɺseq -f͑ͳ͍ͳͲ Friday, August 29, 14
Boot2docker͋Δ͋Δ • ϚγϯΛεϦʔϓͤͯ͞࠶։͢Δͱ͕࣌ؒͣΕΔ • ntpclientίϚϯυʹΑΓखಈͰߦ͏ɻεϦʔϓ෮ ؼͷΠϕϯτΛBoot2dockerଆͰऔಘͰ͖ͳ͍ͷ Ͱ࣌ؒௐ͕దͳͱ͖ʹಈ͔ͳ͍ͷ͕ݪҼ • ྫʣ sudo
ntpclient -s \ -h time.asia.apple.com Friday, August 29, 14
Boot2docker͋Δ͋Δ • Boot2dockerΛऴྃ (down/poweroff) ͤ͞ΔͱҰ෦ͷঢ়ଶ͕ফ͑Δ • Boot2dockerͷঢ়ଶɺ໌ࣔతʹอଘ͠ͳ͚Εফ͑Δ ʢEC2ͷTerminate͔Stopͷҧ͍ʣ ྫʣboot2docker save
• ͨͩ͠ɺEBSͷΑ͏ͳϘϦϡʔϜ(/dev/sda1)ʹอଘ͢Ε σʔλΔ →ಈ࡞தɺఀࢭதͷίϯςφΠϝʔδͪ͜Βʹอଘ͞ΕΔ • tce-loadͰΠϯετʔϧ͢ΔΞϓϦϘϦϡʔϜ্ʹΒͳ ͍ʢrootfsʹه͞ΕΔʣͷͰΠϯελϯεΛམͱ͢ͱফ͑Δ Friday, August 29, 14
Boot2docker͋Δ͋Δ • ࡞ۀதͷঢ়ଶΛҰ࣌อଘ͍ͨ͠ • ίϯςφΛىಈͨ͠··ɺsave·ͨ down͢Δ • ͨͩ͠ɺdownͤ͞ΔͱπʔϧྨͳͲ rootfsྖҬʹஔ͍ͨͷ࣍ճىಈ࣌ ʹͳ͘ͳ͍ͬͯΔͷͰҙ
Friday, August 29, 14
Boot2docker͋Δ͋Δ • ࡞ۀதͷঢ়ଶͰεφοϓγϣοτΛͱ Γ͍ͨ • VirtualBoxVMwareͷػೳͰεφοϓ γϣοτΛͱΔ →ίϯςφΠϝʔδͳͲอଘ͞ΕΔ Friday, August
29, 14
࣭ͳͲ Friday, August 29, 14
࣍ճ४උ • Docker·ͨBoot2docker/VirtualBoxͷΠϯετʔϧ (version 1.1.2) • OSX Boot2dockerϢʔβʔͷΈ • DOCKER_HOSTΛઃఆ͓ͯ͘͠
• BitBucket͔Βprivate-dockerfilesͷclone • ϋϯζΦϯPDFهࡌͷ࡞ۀ༰ͷ͏ͪࣗͰਐΊΒΕ Δͷߦ͓͍͍ͬͯͯͩ͘͞ →μϯϩʔυ͕ूத͢ΔͷΛආ͚ΔͨΊ Friday, August 29, 14