Docker使ってたらサーバがゴミ捨て場みたいになってた話

Immutable Infrastructure Conference #1

Transcript

1. id:y_uuki / @y_uuk1
3. %PDLFS
   ࢖ͬͯͨΒαʔό͕
   ΰϛࣺͯ৔Έ͍ͨʹͳͬͯͨ࿩ *NNVUBCMF
   *OGSBTUSVDUVSF
   $POGFSFODF
   
5. ✘
6. MPBEBWH
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7. • curl http://<jenkins>:8000/job/project • timeout • ssh <jenkins> • timeout • Dom0 ͔Β ήετOSʹϩάΠϯͯ͠ top
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9. w 
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   w -9$
   ͷϓϩηε͕͏Α͏Αͯ͠ɺϝϞϦ৯͍ͭ Ϳͯ͠
   TXBQ |-docker -d -p /var/run/docker.pid -H tcp://0.0.0.0:5555 -H unix:///var/run/docker.sock | |-lxc-start -n 718e7f86d172fc7af7599e0f6472205c986fcc8bf51336ed1a5030900652abfs -f… | |-lxc-start -n 542e7f86d172fc7af7599e0f6472205c986fcc8bf51336ed1a5030900652a2b3 -f… | |-lxc-start -n 983e7f86d172fc7af7599e0f6472205c986fcc8bf51336ed1a5030900652ad00 -f… | |-lxc-start -n 271e7f86d172fc7af7599e0f6472205c986fcc8bf51336ed1a5030900652a111 -f… | |-lxc-start -n 323e7f86d172fc7af7599e0f6472205c986fcc8bf51336ed1a5030900652a1f2 -f… | |-lxc-start -n 789e7f86d172fc7af7599e0f6472205c986fcc8bf51336ed1a5030900652a1f2 -f... w EPDLFS
   TUPQLJMM
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   ͚ͩͩͱϓϩ ηε͸ࢮΜͰ͘Εͳ͍
10. 0 * * * * root docker rm $(docker ps -a -q)
11. σΟεΫϦϓλ਺
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12. 2014/02/13 18:18:46 Error: start: Cannot start container d42e47e9e6bce9770f1d6d940944fc9e3f9a50a00baceaf21bfa9b1bbfced6d6: pipe2: too many open files
13. # lsof -p <docker pid> | wc -l 1021 ! # cat /proc/<docker pid>/limits | grep files Max open files 1024 4096 files
14. root 31084 0.0 0.0 0 0 ? S< 2013 0:00 [ext4-dio-unwrit] root 31105 0.0 0.0 0 0 ? S< 2013 0:00 [kdmflush] root 31107 0.0 0.0 0 0 ? S< 2013 0:00 [bioset] root 31109 0.0 0.0 0 0 ? S 2013 0:00 [jbd2/dm-1793-8] root 31110 0.0 0.0 0 0 ? S< 2013 0:00 [ext4-dio-unwrit] root 31126 0.0 0.0 0 0 ? S< 2013 0:00 [kdmflush] root 31128 0.0 0.0 0 0 ? S< 2013 0:00 [bioset] root 31131 0.0 0.0 0 0 ? S 2013 0:00 [jbd2/dm-1794-8] root 31132 0.0 0.0 0 0 ? S< 2013 0:00 [ext4-dio-unwrit] root 31153 0.0 0.0 0 0 ? S< 2013 0:00 [kdmflush] root 31155 0.0 0.0 0 0 ? S< 2013 0:00 [bioset] root 31157 0.0 0.0 0 0 ? S 2013 0:00 [jbd2/dm-1795-8] root 31159 0.0 0.0 0 0 ? S< 2013 0:00 [ext4-dio-unwrit] root 31176 0.0 0.0 0 0 ? S< 2013 0:00 [kdmflush] root 31178 0.0 0.0 0 0 ? S< 2013 0:00 [bioset] root 31180 0.0 0.0 0 0 ? S 2013 0:00 [jbd2/dm-1796-8] root 31181 0.0 0.0 0 0 ? S< 2013 0:00 [ext4-dio-unwrit] root 31203 0.0 0.0 0 0 ? S< 2013 0:00 [kdmflush] root 31204 0.0 0.0 0 0 ? S< 2013 0:00 [bioset] root 31206 0.0 0.0 0 0 ? S 2013 0:00 [jbd2/dm-1797-8] root 31207 0.0 0.0 0 0 ? S< 2013 0:00 [ext4-dio-unwrit] root 31229 0.0 0.0 0 0 ? S< 2013 0:00 [kdmflush] root 31231 0.0 0.0 0 0 ? S< 2013 0:00 [bioset] root 31234 0.0 0.0 0 0 ? S 2013 0:00 [jbd2/dm-1798-8] root 31235 0.0 0.0 0 0 ? S< 2013 0:00 [ext4-dio-unwrit] root 31247 0.0 0.0 0 0 ? S< 2013 0:00 [kdmflush] root 31249 0.0 0.0 0 0 ? S< 2013 0:00 [bioset] root 31251 0.0 0.0 0 0 ? S 2013 0:00 [jbd2/dm-1799-8] root 31252 0.0 0.0 0 0 ? S< 2013 0:00 [ext4-dio-unwrit]
15. • lsof -p <docker pid> • /dev/mapper/docker-xxx … Έ͍ͨͳΛ΍ͨΒ ͱั·͑ͯΔ • mount /dev/mapper/docker-202:1-3019790-<sha1> on /var/lib/docker/devicemapper/mnt/ <sha1> type ext4 (rw,relatime,discard,stripe=16,data=ordered) /dev/mapper/docker-202:1-3019790-<sha1> on /var/lib/docker/devicemapper/mnt/ <sha1> type ext4 (rw,relatime,discard,stripe=16,data=ordered) /dev/mapper/docker-202:1-3019790-<sha1> on /var/lib/docker/devicemapper/mnt/ <sha1> type ext4 (rw,relatime,discard,stripe=16,data=ordered) ……..
16. docker lxc-start … lxc-start … lxc-start … lxc-start … /dev/mapper/docker-xxx:… ɾ ɾ ɾ /dev/mapper/docker-xxx:… /dev/mapper/docker-xxx:… /dev/mapper/docker-xxx:… /dev/mapper/docker-xxx:… /dev/mapper/docker-xxx:… /dev/mapper/docker-xxx:… /dev/mapper/docker-xxx:… /dev/mapper/docker-xxx:… /dev/mapper/docker-xxx:… /dev/mapper/docker-xxx:… /dev/mapper/docker-xxx:… fork open open open open
17. Device mapper • Docker ͷΠϝʔδࠩ෼؅ཧΛࢧ͑Δٕज़ͷ1ͭ • aufs, btrfs ͳͲͰ୅ସՄೳ • Ծ૝తͳϒϩοΫσόΠεΛͭ͘ΕΔ • Ծ૝తͳϒϩοΫσόΠεΛελοΫͰ͖Δ • ࠩ෼؅ཧ • ࠩ෼͋ͨΓɺ1 mount -> 1 open ??
18. 0 * * * * root docker rm -v $(docker ps -a -q) 1 * * * * root df | cut -d" " -f1 | grep docker | xargs umount /FX
19. κϯϏϓϩηε਺
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20. ! Tasks: 3020 total, 5 running, 2700 sleeping, 0 stopped, 315 zombie
21. • κϯϏʹͳͬͨLXCϓϩηε͕௫ΜͰΔ /dev/ mapper-xxx ͕ Resource Busy ʹͳͬͯͯ umount Ͱ͖ͳ͍ • ଟ෼ɺdocker rm ͰLXCϓϩηεΛ͏·͘ࡴͤͯ ͳͯ͘κϯϏʹͳͬͯΔ
22. 0 * * * * root docker rm -v $(docker ps -a -q) 1 * * * * root df | cut -d" " -f1 | grep docker | xargs umount 0 10 * * * root service docker restart /FX
23. 0 * * * * root docker rm -v $(docker ps -a -q) 1 * * * * root df | cut -d" " -f1 | grep docker | xargs umount 0 10 * * * root service docker restart 59 * * * * root docker ps | grep Ghost | cut -d" " -f1 | xargs docker kill 2 * * * * root docker rmi $(docker images | awk '/^<none>/ { print $3 }') /FX /FX
24. %JTQPTBCMF
25.  ͜͜·Ͱ
26.  https://github.com/dotcloud/docker/blob/master/CHANGELOG.md#080-2014-02-04 https://github.com/dotcloud/docker/blob/master/CHANGELOG.md#081-2014-02-18
27. • Refactor the devicemapper code to avoid many mount/unmount race conditions and failures! • Remove directory when removing devicemapper device. This cleans up leftover mount directories! • Avoid extra mount/unmount during container registration. This removes an unneeded mount/unmount operation which was causing problems with devicemapper! • Clean up archive closing. This fixes and improves archive handling! • Avoid temporarily unmounting the container when restarting it. This fixes a race for devicemapper during restart
28.  https://github.com/dotcloud/docker/blob/master/CHANGELOG.md#090-2014-03-10
29. • Avoid extra mount/unmount during build. This fixes mount/unmount related errors during build.! • Make --rm the default for docker build.! • Devicemapper: cleanups and fix for unmount. Fixes two problems which were causing unmount to fail intermittently.! • Devicemapper: remove directory when removing device. Directories don't get left behind when removing the device.! • Add -f flag to docker rm to force removal of running containers.! • Kill ghost containers and restart all ghost containers when the docker daemon restarts.
30. Clean Infrastructure