Merge pull request opencontainers#35 from mrunalp/rlimits

Adds section for Linux Rlimits

Author: philips

config-linux.md

@@ -104,7 +104,21 @@ For more information, see [the man page](http://man7.org/linux/man-pages/man8/sy
    }
 ```
 
-## Security 
+## Linux rlimits
+
+```
+   "rlimits": [
+        {
+            "type": "RLIMIT_NOPROC"
+            "soft": 1024,
+            "hard": 102400
+        }
+   ]
+```
+
+rlimits allow setting resource limits. The type is from one the values defined in [the man page](http://man7.org/linux/man-pages/man2/setrlimit.2.html). The kernel enforces the soft limit for a resource while the hard limit acts as a ceiling for that value that could be set by an unprivileged process.
+
+## Security
 
 **TODO:** security profiles