Add MongoDB mongos upstart script to elements

The custom upstart script should be a part of the elements, as it is OS
specific. This requires 2 parts - add the code to the elements (here),
and remove the code from trove (follow-up).

Partial-Bug: 1493515
Change-Id: I0ae98f173058cae6b9e0eee440318f0277972503

scripts/files/elements/ubuntu-mongodb/install.d/10-mongodb

@@ -35,3 +35,31 @@ apt-get install -y mongodb-org
 sed -i '/bindIp/d' /etc/mongod.conf
 # need to use smallFiles until the device is mounted
 sed -i 's/#  mmapv1:/  mmapv1:\n    smallFiles: true/' /etc/mongod.conf
+
+cat > "/etc/init/mongos.conf" << '_EOF_'
+limit fsize unlimited unlimited  # (file size)
+limit cpu unlimited unlimited    # (cpu time)
+limit as unlimited unlimited     # (virtual memory size)
+limit nofile 64000 64000         # (open files)
+limit nproc 64000 64000          # (processes/threads)
+
+pre-start script
+    mkdir -p /var/log/mongodb/
+end script
+
+start on runlevel [2345]
+stop on runlevel [06]
+
+script
+    ENABLE_MONGOS="yes"
+    if [ -f /etc/default/mongos ]
+    then
+        . /etc/default/mongos
+    fi
+    if [ "x$ENABLE_MONGOS" = "xyes" ]
+    then
+        exec start-stop-daemon --start --quiet --chuid mongodb \
+            --exec  /usr/bin/mongos -- --config /etc/mongod.conf
+    fi
+end script
+_EOF_