Update troubleshooting.md

Add `killed` symptom to troubleshooting guide.

docs/getting-started/troubleshooting.md

@@ -154,3 +154,23 @@ dokku config:set --global CURL_CONNECT_TIMEOUT=30
 ```
 
 Please see https://github.com/dokku/dokku/issues/509
+
+***
+
+__Symptom:__ Build fails with `Killed` message.
+
+__Solution:__
+
+This generally occurs when the server runs out of memory. You can either add more ram to your server or setup swap space. The follow script will create 2gb of swap space.
+
+```shell
+sudo install -o root -g root -m 0600 /dev/null /swapfile
+dd if=/dev/zero of=/swapfile bs=1k count=2048k
+mkswap /swapfile
+swapon /swapfile
+echo "/swapfile       swap    swap    auto      0       0" | sudo tee -a /etc/fstab
+sudo sysctl -w vm.swappiness=10
+echo vm.swappiness = 10 | sudo tee -a /etc/sysctl.conf
+```
+
+***