Merge pull request #1123 from StackStorm/erlang_issues

Update EL8 instructions for Erlang 25 issues

Author: cognifloyd

docs/source/install/rhel8.rst

@@ -81,12 +81,18 @@ Install MongoDB, RabbitMQ, and Redis:
   curl -sL https://packagecloud.io/install/repositories/rabbitmq/erlang/script.rpm.sh | sudo bash
   curl -sL https://packagecloud.io/install/repositories/rabbitmq/rabbitmq-server/script.rpm.sh | sudo bash
   sudo yum makecache -y --disablerepo='*' --enablerepo='rabbitmq_rabbitmq-server'
-  sudo yum -y install erlang
+  sudo yum -y install erlang-24*
   sudo yum -y install rabbitmq-server
   sudo yum -y install redis
   sudo systemctl start mongod rabbitmq-server redis
   sudo systemctl enable mongod rabbitmq-server redis
 
+.. note::
+
+    RabbitMQ currently only has provisional support for Erlang 25, however it is available in the
+    RabbitMQ-Erlang repository. Problems have been encountered using RabbitMQ with Erlang 25, therefore
+    it is advised to install the latest Erlang 24 version instead.
+
 
 Setup Repositories
 ~~~~~~~~~~~~~~~~~~