Zhitao Li created MESOS-5028:
--------------------------------
Summary: Copy provisioner does not work for docker image layers
with dangling symlink
Key: MESOS-5028
URL: https://issues.apache.org/jira/browse/MESOS-5028
Project: Mesos
Issue Type: Bug
Components: containerization
Reporter: Zhitao Li
Assignee: Jie Yu
I'm trying to play with the new image provisioner on our custom docker images,
but one of layer failed to get copied, possibly due to a dangling symlink.
Error log with Glog_v=1:
{quote}
I0324 05:42:48.926678 15067 copy.cpp:127] Copying layer path
'/tmp/mesos/store/docker/layers/5df0888641196b88dcc1b97d04c74839f02a73b8a194a79e134426d6a8fcb0f1/rootfs'
to rootfs
'/var/lib/mesos/provisioner/containers/5f05be6c-c970-4539-aa64-fd0eef2ec7ae/backends/copy/rootfses/507173f3-e316-48a3-a96e-5fdea9ffe9f6'
E0324 05:42:49.028506 15062 slave.cpp:3773] Container
'5f05be6c-c970-4539-aa64-fd0eef2ec7ae' for executor 'test' of framework
75932a89-1514-4011-bafe-beb6a208bb2d-0004 failed to start: Collect failed:
Collect failed: Failed to copy layer: cp: cannot overwrite directory
‘/var/lib/mesos/provisioner/containers/5f05be6c-c970-4539-aa64-fd0eef2ec7ae/backends/copy/rootfses/507173f3-e316-48a3-a96e-5fdea9ffe9f6/etc/apt’
with non-directory
{quote}
Content of
_/tmp/mesos/store/docker/layers/5df0888641196b88dcc1b97d04c74839f02a73b8a194a79e134426d6a8fcb0f1/rootfs/etc/apt_
points to a non-existing absolute path (cannot provide exact path but it's a
result of us trying to mount apt keys into docker container at build time).
I believe what happened is that we executed a script at build time, which
contains equivalent of:
{quote}
rm -rf /etc/apt/* && ln -sf /build-mount-point/ /etc/apt
{quote}
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