Set TCP keepalive for MySQL connections.

BUG=skia:
R=mtklein@google.com

Author: jcgregorio@google.com

Review URL: https://codereview.chromium.org/268473002

git-svn-id: http://skia.googlecode.com/svn/trunk@14474 2bbb7eff-a529-9590-31e7-b0007b416f81

experimental/webtry/README.md

@@ -62,6 +62,11 @@ then run the following so it applies:
 
 This means that monit will poll every two seconds that our application is up and running.
 
+6. Set the TCP keepalive. For more info see:
+   https://developers.google.com/cloud-sql/docs/gce-access
+
+    sudo bash -c 'echo 60 > /proc/sys/net/ipv4/tcp_keepalive_time'
+
 Do the first time
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