Github user wuchong commented on a diff in the pull request:
https://github.com/apache/storm/pull/1054#discussion_r54042400
--- Diff: documentation/cgroups_in_storm.md ---
@@ -0,0 +1,65 @@
+# CGroups in Storm
+
+CGroups are used by Storm to limit the resource usage of workers to
guarantee fairness and QOS.
+
+**Please note: CGroups is currently supported only on Linux platforms
(kernel version 2.6.24 and above)**
+
+## Setup
+
+To use CGroups make sure to install cgroups and configure cgroups
correctly. For more information about setting up and configuring, please visit:
+
+https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Resource_Management_Guide/ch-Using_Control_Groups.html
+
+A sample/default cgconfig.conf file is supplied in the <stormroot>/conf
directory. The contents are as follows:
+
+```
+mount {
+ cpuset = /cgroup/cpuset;
+ cpu = /cgroup/storm_resources;
+ cpuacct = /cgroup/cpuacct;
+ memory = /cgroup/storm_resources;
+ devices = /cgroup/devices;
+ freezer = /cgroup/freezer;
+ net_cls = /cgroup/net_cls;
+ blkio = /cgroup/blkio;
+}
+
+group storm {
+ perm {
+ task {
+ uid = 500;
+ gid = 500;
+ }
--- End diff --
Can we tell users what dose `uid` and `gid` mean? and how to set them?
Because it depends on the user who runs storm.
We can check `/etc/passwd` to find user's uid and gid. Such as in my
`/etc/passwd` the `admin`'s uid and gid both are `505`
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