DevinLeamy opened a new pull request, #556:
URL: https://github.com/apache/mesos/pull/556
Updates the cgroups v2 isolator to include initialization, cleanup, update,
and recovery logic.
Unlike cgroups v1 we:
- Create a new cgroup namespace during isolation, by introducing a new clone
namespace flag. This implies that the contained process will only have access
to cgroups in its cgroup subtree
- We only need to recover two cgroups (the domain and leaf cgroups [1]) for
each container, rather than having to recover one cgroup for each controller
the container used.
- We do not (yet) support nested containers.
Using the cgroups v2 isolator requires Mesos to be compiled with
`--enable-cgroups-v2` and to have the cgroup2 filesystem mounted at
/sys/fs/cgroup. Selecting the correct isolator version (v1 or v2) is done
automatically. V2 is used if the host supports cgroups v2 and is correctly
configured.
[1] The "domain" cgroup is the cgroup for a container where resource
constraints are imposed. The "leaf" cgroup, which has the path
<domain cgroup>/leaf, is where the container PID is put.
Container PIDs are only put in leaf cgroups.
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