[02/16] mesos git commit: Added the description for the isolators section.

[ji...@apache.org]

Added the description for the isolators section.

Review: https://reviews.apache.org/r/62308


Project: http://git-wip-us.apache.org/repos/asf/mesos/repo
Commit: http://git-wip-us.apache.org/repos/asf/mesos/commit/344bf40b
Tree: http://git-wip-us.apache.org/repos/asf/mesos/tree/344bf40b
Diff: http://git-wip-us.apache.org/repos/asf/mesos/diff/344bf40b

Branch: refs/heads/master
Commit: 344bf40bdc99ae22d2416c8ef7ab860ad4ea9bf3
Parents: 21a42e1
Author: Jie Yu <yu...@gmail.com>
Authored: Wed Sep 13 13:46:39 2017 -0700
Committer: Jie Yu <yu...@gmail.com>
Committed: Mon Sep 18 12:04:38 2017 -0700

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 docs/mesos-containerizer.md | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)
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http://git-wip-us.apache.org/repos/asf/mesos/blob/344bf40b/docs/mesos-containerizer.md
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diff --git a/docs/mesos-containerizer.md b/docs/mesos-containerizer.md
index 7f09fff..c6af42e 100644
--- a/docs/mesos-containerizer.md
+++ b/docs/mesos-containerizer.md
@@ -5,16 +5,27 @@ layout: documentation
 
 # Mesos Containerizer
 
-The MesosContainerizer provides lightweight containerization and
+The Mesos Containerizer provides lightweight containerization and
 resource isolation of executors using Linux-specific functionality
 such as control cgroups and namespaces. It is composable so operators
-can selectively enable different isolators.
+can selectively enable different [isolators](#isolators).
 
 It also provides basic support for POSIX systems (e.g., OSX) but
 without any actual isolation, only resource usage reporting.
 
 ## Isolators
 
+Isolators are components that each define an aspect of how a tasks
+execution environment (or container) is constructed. Isolators can
+control how containers are isolated from each other, how task resource
+limits are enforced, how networking is configured, how security
+policies are applied.
+
+Since the isolator interface is [modularized](modules.md), operators
+can write modules that implement custom isolators.
+
+Mesos supports the following built-in isolators (not a complete list).
+
 - [cgroups/net_cls](isolators/cgroups-net-cls.md)
 - [disk/du](isolators/disk-du.md)
 - [disk/xfs](isolators/disk-xfs.md)