[CRIU] Process migration between two RPi2 with Criu
alex vk
avankemp at gmail.com
Thu May 19 09:37:10 PDT 2016
pi at raspberrypi:~/criu/criu $ ./migrate-ssh.sh
Warn (autofs.c:74): Failed to find pipe_ino option (old kernel?)
Connection to 192.168.0.2 closed.
Snapshoted
cgroup.img 100% 1948 1.9KB/s 00:00
core-943.img 100% 602 0.6KB/s 00:00
fdinfo-2.img 100% 80 0.1KB/s 00:00
fs-943.img 100% 18 0.0KB/s 00:00
ids-943.img 100% 32 0.0KB/s 00:00
inetsk.img 100% 251 0.3KB/s 00:00
inventory.img 100% 38 0.0KB/s 00:00
mm-943.img 100% 1862 1.8KB/s 00:00
pagemap-943.img 100% 242 0.2KB/s 00:00
pages-1.img 100% 252KB 252.0KB/s 00:00
pstree.img 100% 26 0.0KB/s 00:00
reg-files.img 100% 994 1.0KB/s 00:00
sigacts-943.img 100% 752 0.7KB/s 00:00
stats-dump 100% 36 0.0KB/s 00:00
tty.img 100% 30 0.0KB/s 00:00
tty-info.img 100% 178 0.2KB/s 00:00
Image transfered
(00.082257) Pagemap is fully functional
(00.082543) Found task size of 7f000000
(00.082892) Reading image tree
(00.083089) Add mnt ns 5 pid 943
(00.083211) Migrating process tree (GID 943->805 SID 791->741)
(00.083259) Will restore in 0 namespaces
(00.083295) NS mask to use 0
(00.083331) Collecting 39/18 (flags 1)
(00.083428) Collected [dev/pts/0] ID 0x1
(00.083486) Collected [lib/arm-linux-gnueabihf/libresolv-2.19.so] ID 0x5
(00.083536) Collected [lib/arm-linux-gnueabihf/libnss_dns-2.19.so] ID 0x6
(00.083581) Collected [lib/arm-linux-gnueabihf/libnss_files-2.19.so] ID 0x7
(00.083626) Collected [lib/arm-linux-gnueabihf/libc-2.19.so] ID 0x8
(00.083672) Collected [lib/arm-linux-gnueabihf/libgcc_s.so.1] ID 0x9
(00.083715) Collected [lib/arm-linux-gnueabihf/libm-2.19.so] ID 0xa
(00.083759) Collected [usr/lib/arm-linux-gnueabihf/libstdc++.so.6.0.20] ID
0xb
(00.083804) Collected [lib/arm-linux-gnueabihf/libz.so.1.2.8] ID 0xc
(00.083847) Collected [usr/lib/arm-linux-gnueabihf/libenet.so.7.0.0] ID 0xd
(00.083892) Collected [usr/lib/arm-linux-gnueabihf/libarmmem.so] ID 0xe
(00.083935) Collected [lib/arm-linux-gnueabihf/ld-2.19.so] ID 0xf
(00.083978) Collected [lib/arm-linux-gnueabihf/libnss_mdns4_minimal.so.2]
ID 0x10
(00.084022) Collected [usr/lib/cube2/cube2_server] ID 0x11
(00.084064) Collected [usr/lib/cube2] ID 0x12
(00.084104) Collected [.] ID 0x13
(00.084151) `- ... done
(00.084182) Collecting 52/56 (flags 0)
(00.084259) No remap-fpath.img image
(00.084318) `- ... done
(00.084384) Collecting 42/21 (flags 0)
(00.084549) `- ... done
(00.084991) cg: Preparing cgroups yard (cgroups restore mode 0x4)
(00.089011) cg: Opening .criu.cgyard.lg48ci as cg yard
(00.089161) cg: Making controller dir .criu.cgyard.lg48ci/blkio (blkio)
(00.089465) cg: Determined cgroup dir blkio/ already exist
(00.089495) cg: Skip restoring properties on cgroup dir blkio/
(00.089593) cg: Making controller dir .criu.cgyard.lg48ci/net_cls (net_cls)
(00.089862) cg: Determined cgroup dir net_cls/ already exist
(00.089899) cg: Skip restoring properties on cgroup dir net_cls/
(00.089978) cg: Making controller dir .criu.cgyard.lg48ci/freezer (freezer)
(00.090218) cg: Determined cgroup dir freezer/ already exist
(00.090257) cg: Skip restoring properties on cgroup dir freezer/
(00.090334) cg: Making controller dir .criu.cgyard.lg48ci/devices (devices)
(00.090646) cg: Determined cgroup dir devices/ already exist
(00.090708) cg: Skip restoring properties on cgroup dir devices/
(00.090811) cg: Making controller dir .criu.cgyard.lg48ci/cpu,cpuacct
(cpu,cpuacct)
(00.091066) cg: Determined cgroup dir cpu,cpuacct/ already exist
(00.091123) cg: Skip restoring properties on cgroup dir cpu,cpuacct/
(00.091229) cg: Making controller dir .criu.cgyard.lg48ci/cpuset (cpuset)
(00.091431) Error (cgroup.c:1562): cg: Can't mount controller dir
.criu.cgyard.lg48ci/cpuset: No such file or directory
Hi everyone,
I'm coming back to you because I still have a problem when restoring a
snapshotted process from a given RPi2 on another RPi2.
The snapshot/restore works well on the same RPi2 thanks to the patch :
https://lists.openvz.org/pipermail/criu/2016-April/027743.html
(Criu-dev version + patch and Kernel 3.18)
However when I try to restore a snapshotted process from a given RPi2 on
another RPi2. (with exactly the same image installed on the SD card) I
obtain the following error :
(00.091431) Error (cgroup.c:1562): cg: Can't mount controller dir
.criu.cgyard.lg48ci/cpuset: No such file or directory
(the snapshot process has succeeded on the first Rpi2)
The dir .criu.cgyard.lg48ci is indeed empty.
CONFIG_CGROUPS and CONFIG_MEMCG are enabled (CONFIG_MEMCG_SWAP and
CONFIG_MEMCG_KMEM
are disabled) if that matters...
Am I doing something wrong here ?
Thanks again for your help,
Alex
Here is the simple script i'm using to migrate and the full log of the
restore:
--------------------------------
ssh -t pi at 192.168.0.1 'pid=$(pidof cube2_server); sudo criu dump -D
/home/pi/checkpoint/ -t $pid --tcp-established --shell-job' echo
"Snapshotted" scp pi at 192.168.0.1:/home/pi/checkpoint/*
/home/pi/checkpoint/ echo
"Image transferred" sudo criu restore -d -D /home/pi/checkpoint/
--shell-job --tcp-established echo "Image restored"
--------------------------------
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