These Apache settings actually seem to work (i.e. avoid oom-killer killing mysqld)

beaglebone.txt

 #+BEGIN_SRC: bash
 Timeout 30
 KeepAlive On
-MaxKeepAliveRequests 50
-KeepAliveTimeout 10
+MaxKeepAliveRequests 5
+KeepAliveTimeout 1
 
 <IfModule mpm_prefork_module>
-  StartServers          3
-  MinSpareServers       2
-  MaxSpareServers       5
-  MaxClients            10
-  MaxRequestsPerChild   1000
+    StartServers 5
+    MinSpareServers 5
+    MaxSpareServers 10
+    MaxClients 10
+    MaxRequestsPerChild 10
 </IfModule>
 
 <IfModule mpm_worker_module>
-    StartServers          2
-    MinSpareThreads      25
-    MaxSpareThreads      75
-    ThreadLimit          64
-    ThreadsPerChild      25
-    MaxClients           10
-    MaxRequestsPerChild   0
+    StartServers 2
+    MinSpareThreads 5
+    MaxSpareThreads 5
+    ThreadLimit 6
+    ThreadsPerChild 10
+    MaxClients 10
+    MaxRequestsPerChild 10
 </IfModule>
 
 <IfModule mpm_event_module>
-    StartServers          2
-    MinSpareThreads      25
-    MaxSpareThreads      75
-    ThreadLimit          64
-    ThreadsPerChild      25
-    MaxClients           10
-    MaxRequestsPerChild   0
+    StartServers 2
+    MinSpareThreads 5
+    MaxSpareThreads 5
+    ThreadLimit 6
+    ThreadsPerChild 10
+    MaxClients 10
+    MaxRequestsPerChild 10
 </IfModule>
 #+END_SRC