haosdent commented on MESOS-6312:

It would be something like 
diff --git a/bin/mesos-local-flags.sh.in b/bin/mesos-local-flags.sh.in
index 5b4553a..97828ea 100644
--- a/bin/mesos-local-flags.sh.in
+++ b/bin/mesos-local-flags.sh.in
@@ -17,6 +17,7 @@
 # limitations under the License.

 export MESOS_WORK_DIR=/tmp/mesos
+export MESOS_RUNTIME_DIR=/tmp/mesos

 . @abs_top_builddir@/bin/mesos-master-flags.sh
 . @abs_top_builddir@/bin/mesos-agent-flags.sh
diff --git a/src/local/flags.hpp b/src/local/flags.hpp
index c77eff1..bf815a9 100644
--- a/src/local/flags.hpp
+++ b/src/local/flags.hpp
@@ -51,6 +51,14 @@ public:
         "(Example: `/var/lib/mesos`)",
         path::join(os::temp(), "mesos", "local"));

+    add(&Flags::runtime_dir,
+        "runtime_dir",
+        "Path of the agent runtime directory. This is where runtime data\n"
+        "is stored by an agent that it needs to persist across crashes (but\n"
+        "not across reboots). This directory will be cleared on reboot.\n"
+        "(Example: `/var/run/mesos`)",
+        path::join(os::temp(), "mesos", "local"));

> Add requirement in upgrade.md and getting-started.md for agent 
> '--runtime_dir' in when running as non-root
> ----------------------------------------------------------------------------------------------------------
>                 Key: MESOS-6312
>                 URL: https://issues.apache.org/jira/browse/MESOS-6312
>             Project: Mesos
>          Issue Type: Task
>            Reporter: Kevin Klues
>            Assignee: Kevin Klues
>            Priority: Blocker
> We recently introduced a new agent flag for {{\-\-runtime_dir}}. Unlike the 
> {{\-\-work_dir}}, this directory is designed to hold the state of a running 
> agent between subsequent agent-restarts (but not across host reboots).
> By default, this flag is set to {{/var/run/mesos}} since this is a {{tempfs}} 
> on linux that gets automatically cleaned up on reboot. However, on most 
> systems {{/var/run/mesos}} is only writable by root, causing problems when 
> launching an agent as non-root and not pointing {{--runtime_dir}} to a 
> different location.
> We need to call this out in the upgrade.md and getting-started.md docs so 
> that people know they may need to set this going forward.

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