Update install.md

doc/install.md

@@ -12,7 +12,7 @@ The current version of SOCTools only runs on a single server. A fully distribute
 * Minimal installation of CentOS7
 * Install Ansible
   * `sudo yum -y install epel-release`  
-  * `sudo yum -y install ansible git firewalld`
+  * `sudo yum -y install ansible git`
   * `sudo ansible-galaxy collection install ansible.posix`
 
 ## Clone SOCTools
@@ -34,7 +34,8 @@ Build the Docker images:
 * `ansible-playbook -i inventories buildimages.yml`
 
 Build SOCTools CA needed for service and user certificates:
-* `ansible-playbook -i inventories buildca.yml`
+* `ansible-playbook -i inventories buildca.yml`  
+This playbook will generate some errors but this is normal as long as the playbook ignores them and finish without stopping. 
 
 Start SOCTools:
 * `ansible-playbook -i inventories soctools.yml -t start`