Ubuntu Server Guide

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681 → 690 of 704 results First • • • Last
4722.
A hierarchy is created by mounting an instance of the cgroup filesystem with each of the desired subsystems listed as a mount option. For instance,
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Located in serverguide/C/cgroups.xml:95(para)
4724.
would instantiate a hierarchy with the devices and memory cgroups comounted. A child cgroup "child1" can be created using 'mkdir'
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Located in serverguide/C/cgroups.xml:104(para)
4726.
and tasks can be moved into the new child cgroup by writing their process IDs into the 'tasks' or 'cgroup.procs' file:
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Located in serverguide/C/cgroups.xml:113(para)
4728.
Other administration is done through files in the cgroup directories. For instance, to freeze all tasks in child1,
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Located in serverguide/C/cgroups.xml:123(para)
4730.
A great deal of information about cgroups and its subsystems can be found under the cgroups documentation directory in the kernel source tree (see Resources).
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Located in serverguide/C/cgroups.xml:132(para)
4731.
Delegation
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Located in serverguide/C/cgroups.xml:141(title)
4732.
Cgroup files and directories can be owned by non-root users, enabling delegation of cgroup administration. In general, the kernel enforces the hierarchical constraints on limits, so that for instance if devices cgroup <filename>/child1</filename> cannot access a disk drive, then <filename>/child1/child2</filename> cannot give itself those rights.
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Located in serverguide/C/cgroups.xml:143(para)
4733.
As of Ubuntu 14.04, users are automatically placed in a set of cgroups which they own, safely allowing them to contrain their own jobs using child cgroups. This feature is relied upon, for instance, for unprivileged container creation in lxc.
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Located in serverguide/C/cgroups.xml:151(para)
4734.
Manager
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Located in serverguide/C/cgroups.xml:161(title)
4735.
The cgroup manager (cgmanager) provides a D-Bus service allowing programs and users to administer cgroups without needing direct knowledge of or access to the cgroup filesystem. For requests from tasks in the same namespaces as the manager, the manager can directly perform the needed security checks to ensure that requests are legitimate. For other requests - such as those from a task in a container - enhanced D-Bus requests must be made, where process-, user- and group-ids are passed as SCM_CREDENTIALS, so that the kernel maps the identifiers to their global host values.
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Located in serverguide/C/cgroups.xml:163(para)
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Contributors to this translation: Amarokk, Anthony MASSET, Cob @FPGLaurent, Doug Smythies, Emmanuel Sunyer, Enrico Rosina, Havok Novak, Jean-Marc, Jeff, Nicolas Delvaux, Pascal Baudry, Pascal Maugendre, Peter Matulis, Philip Millan, Pierre Slamich, Simon THOBY, Sylvie Gallet, Sébastien DUMORTIER, Vilsafur, YoBoY, alexandre958, baj, gisele perreault, jean-bernard marcon, jeanne_jeremy, simon-alexandre.