[CRIU] Criu docker apache

[Konstantin Kolias]

Hello all,

I get an error with something really basic: trying to checkpoint restore an apache container (docker).


My settings:
Ubuntu 16.04 (on amazon vm)
Docker 1.11.2
Criu 2.0
Created a container debian + apache.
Made it run with:  sudo docker run -d -p 8080:80 apache /usr/sbin/apache2ctl –X

I did this in an attempt to create a single process apache.

Then attempted to take a checkpoint:
sudo criu dump -o dump.log -v4 -t 329 \
-D /tmp/img/0d97f03fb4880e0d65f97974e7fbef43735e4283acf47c1b7cc705e10e7e6759 \
--ext-mount-map /etc/resolv.conf:/etc/resolv.conf \
--ext-mount-map /etc/hosts:/etc/hosts \
--ext-mount-map /etc/hostname:/etc/hostname \
--ext-mount-map /.dockerinit:/.dockerinit \
--ext-mount-map /sys/fs/cgroup/memory:/sys/fs/cgroup/memory \
--ext-mount-map /sys/fs/cgroup/cpu,cpuacct:/sys/fs/cgroup/cpu,cpuacct \
--ext-mount-map /sys/fs/cgroup/freezer:/sys/fs/cgroup/freezer \
--ext-mount-map /sys/fs/cgroup/cpuset:/sys/fs/cgroup/cpuset \
--ext-mount-map /sys/fs/cgroup/perf_event:/sys/fs/cgroup/perf_event \
--ext-mount-map /sys/fs/cgroup/devices:/sys/fs/cgroup/devices \
--ext-mount-map /sys/fs/cgroup/hugetlb:/sys/fs/cgroup/hugetlb \
--ext-mount-map /sys/fs/cgroup/net_cls,net_prio:/sys/fs/cgroup/net_cls,net_prio \
--ext-mount-map /sys/fs/cgroup/blkio:/sys/fs/cgroup/blkio \
--ext-mount-map /sys/fs/cgroup/pids:/sys/fs/cgroup/pids \
--ext-mount-map /sys/fs/cgroup/systemd:/sys/fs/cgroup/systemd \
--manage-cgroups \
--evasive-devices


I get an error:
Error (mount.c:740): mnt: 292:./etc/resolv.conf doesn't have a proper root mount
(00.008457) Unlock network
(00.008459) Running network-unlock scripts
(00.009719) Unfreezing tasks into 1
(00.009728)     Unseizing 329 into 1
(00.009739)     Unseizing 349 into 1
(00.009845) Error (cr-dump.c:1600): Dumping FAILED.

Can anyone explain the possible reasons for this error and the nature of the problem?

It’s the first time I post to this mailing list so I don’t know if it’s proper to post my lengthy dump.log file.

Regards
Costas


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