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From Joshua Cohen <>
Subject Re: Review Request 46835: Add client and scheduler support for launching tasks using the Mesos unified containerizer
Date Tue, 03 May 2016 21:59:02 GMT

> On May 3, 2016, 8:39 p.m., Stephan Erb wrote:
> >, line 23
> > <>
> >
> >     How would I do the mounting? Via the global container mounts scheduler option?
> >     
> >     So, once we have mounted the passwd and group file, is `thermos_run_as_job_role`
still needed? Shouldn't that allow us to use the normal setuid of thermos?

> How would I do the mounting? Via the global container mounts scheduler option?

Yes (can see our aurora-scheduler.conf for the vagrant image for an example).

> So, once we have mounted the passwd and group file, is thermos_run_as_job_role still
needed? Shouldn't that allow us to use the normal setuid of thermos?

You're right, it's actually not needed. The root cause of the problem that made me think this
was required was that the `DockerDirectorySandbox` (now the `FileSystemImageSandbox`) did
not take the user as a parameter, and instead always passed `None`. As part of adding support
for `thermos_run_as_job_role` I added that arg to the constructor and didn't rethink the need
for the scheduler arg entirely. Thanks for catching this!

- Joshua

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On April 29, 2016, 4:22 p.m., Joshua Cohen wrote:
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> -----------------------------------------------------------
> (Updated April 29, 2016, 4:22 p.m.)
> Review request for Aurora, John Sirois, Maxim Khutornenko, and Bill Farner.
> Bugs: AURORA-1636, AURORA-1637, AURORA-1638, and AURORA-1639
> Repository: aurora
> Description
> -------
> A few notes:
> 1. It's not possible to configure Mesos 0.27.x to launch docker tasks due to a bug in
parsing the docker_store_dir flag. Fixed here: but has
not been backported to Mesos 0.27. This means we can only launch tasks that use AppC images
until we upgrade our Mesos dependency to 0.28.x. The good news is I've confirmed that launching
tasks with Docker images *does* work by using Aurora linked against 0.27.x but running Mesos
0.28.x in Vagrant.
> 1. In order to work around the setuid issues (i.e. task is launched as root, but the
executor cannot setuid because the role-user does not exist), I've mounted /etc/passwd and
/etc/group into the container and added a new flag, `thermos_run_as_job_role`, to the scheduler.
This flag is only used when launching a task with a filesystem image, and causes us to add
`--execute-as-user <role from job key>` to the thermos executor commandline.
> 1. The Mesos unified containerizer does not automatically create mount points in the
filesystem from the image. It expects the full path to the mount to exist in the image. For
/etc/passwd and /etc/groups this is not a problem, but for the announcer acls file it was.
I ended up moving the announcer acl file into its own directory and mount that instead. In
conjunction with this I also had to modify our http_example Dockerfile to explicitly create
that mount point. A case could be made for sticking with the current path and just creating
an empty file in the image, I felt that creating an empty directory was slightly less gross.
This is tracked by
> 1. The AppC image for end to end tests is created by running [docker2aci](
on our http_example docker image. The base box needed to be upgraded to add this utility.
I haven't published the new base box yet even though I've updated the Vagrantfile to point
to version 6. Once this review has been approved and I'm sure there's no further changes that
need to be made I'll publish the base box before committing.
> Diffs
> -----
> 7a37d0d69f688bece624628fe5b98efc85d506a2 
>   Vagrantfile 3f126ee348d0f95d6f159b62280de79f41e87e2e 
>   build-support/packer/ 76197c31c365aa3d8a67049da40b2976c1e25d22 
>   docs/reference/ 9fcfdfcd9ab793e888ca2bba2035d5122142a5ab 
>   docs/reference/ d2262f79edfde23eccd87bae7f1cf319b63b1103

>   examples/vagrant/announcer-auth.json  
>   examples/vagrant/mesos_config/etc_mesos-slave/appc_store_dir PRE-CREATION 
>   examples/vagrant/mesos_config/etc_mesos-slave/image_providers PRE-CREATION 
>   examples/vagrant/mesos_config/etc_mesos-slave/image_provisioner_backend PRE-CREATION

>   examples/vagrant/mesos_config/etc_mesos-slave/isolation PRE-CREATION 
>   examples/vagrant/upstart/aurora-scheduler.conf 084016abc169ed82b7ed00f5d14aea2e0ff38a49

>   src/main/java/org/apache/aurora/scheduler/configuration/executor/
>   src/main/java/org/apache/aurora/scheduler/configuration/executor/
>   src/main/java/org/apache/aurora/scheduler/mesos/ b325106c7f45b1ad1657221aaa39e3a428719ab0

>   src/main/java/org/apache/aurora/scheduler/mesos/ 9aadcebf547bd1eb4b4e238507e27ae2b699f473

>   src/main/python/apache/aurora/config/schema/ 00be8747d70dbf1cb370f09536588f8602d8fcce

>   src/main/python/apache/aurora/config/ 928ca9313b2c2062a322ba80b504a09c55e5377f

>   src/main/python/apache/aurora/executor/common/ 36f1eabedc3ae47b23d9ab2ac0ab7a576ea36fd7

>   src/test/java/org/apache/aurora/scheduler/mesos/ bf18d5d53f7eda62120299146a956fa0a0985f71

>   src/test/python/apache/aurora/config/ 7a076f0350ab2967abc6b8b7a2e5da0817926a56

>   src/test/python/apache/aurora/executor/common/ bd402fc03c7790eab0198dd48414ad4de138e195

>   src/test/sh/org/apache/aurora/e2e/Dockerfile b2557b5a20cc369e31bd10ea92462bdb1879add7

>   src/test/sh/org/apache/aurora/e2e/http/http_example.aurora 2813b6c79e4d44007dde79a10e2c7c9e9c1cecd9

>   src/test/sh/org/apache/aurora/e2e/http/http_example_bad_healthcheck.aurora 0534c9e589d10c53b834850477f95ad15b50010e

>   src/test/sh/org/apache/aurora/e2e/http/http_example_updated.aurora b33e8f5cd95ce25ba0dc4c08da32783cecf1c44d

>   src/test/sh/org/apache/aurora/e2e/ eee6b4c62130567ecd5c32603feae88fce1c13a8

> Diff:
> Testing
> -------
> ./gradlew build -Pq
> e2e tests with new base box.
> Thanks,
> Joshua Cohen

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