Issue #327: Updated documentation to include underscore character as invalid in hostnames in the mapping_file

Signed-off-by: avinashvishwanath <avinash_vishwanath@dell.com>

docs/INSTALL_OMNIA.md

@@ -11,7 +11,7 @@ The following sections provide details on installing Omnia using CLI. If you wan
 
 1. Clone the Omnia repository:
 ``` 
-git clone https://github.com/dellhpc/omnia.git 
+git clone -b release https://github.com/dellhpc/omnia.git 
 ```
 __Note:__ After the Omnia repository is cloned, a folder named __omnia__ is created. Ensure that you do not rename this folder.
 
@@ -107,9 +107,9 @@ Commands to install JupyterHub and Kubeflow:
 * `ansible-playbook platforms/jupyterhub.yml -i inventory -e "ansible_python_interpreter=/usr/bin/python2"`
 * `ansible-playbook platforms/kubeflow.yml -i inventory -e "ansible_python_interpreter=/usr/bin/python2" `
 
-__Note:__ When the Internet connectivity is unstable or slow, it may take more time to pull the images to create the Kubeflow containers. If the time limit is exceeded, the **Apply Kubeflow configurations** task may fail. To resolve this issue, you must redeploy Kubernetes cluster and reinstall Kubeflow by completing the following steps:
+__Note:__ When the Internet connectivity is unstable or slow, it may take more time to pull the images to create the Kubeflow containers. If the time limit is exceeded, the Apply Kubeflow configurations task may fail. To resolve this issue, you must redeploy Kubernetes cluster and reinstall Kubeflow by completing the following steps:
 * Format the OS on manager and compute nodes.
-* In the `omnia_config.yml` file, change the k8s_cni variable value from calico to flannel.
+* In the omnia_config.yml file, change the k8s_cni variable value from calico to flannel.
 * Run the Kubernetes and Kubeflow playbooks.
 
 ## Add a new compute node to the cluster

docs/INSTALL_OMNIA_APPLIANCE.md

@@ -11,7 +11,7 @@
 1. On the management node, change the working directory to the directory where you want to clone the Omnia Git repository.
 2. Clone the Omnia repository:
 ``` 
-git clone https://github.com/dellhpc/omnia.git 
+git clone -b release https://github.com/dellhpc/omnia.git 
 ```
 3. Change the directory to __omnia__: `cd omnia`
 4. Edit the `omnia_config.yml` file to:
@@ -32,7 +32,7 @@ __Note:__
 	
 	d. Provide a mapping file for DHCP configuration under `mapping_file_path`. The **mapping_file.csv** template file is present under `omnia/examples`. Enter the details in the order: `MAC, Hostname, IP`. The header in the template file must not be deleted before saving the file.  
 	If you want to continue without providing a mapping file, leave the `mapping_file_path` value as blank.  
-	__Note:__ Ensure that duplicate values are not provided for MAC, Hostname, and IP in the mapping file. The Hostname should not contain the following characters: , (comma), \. (period), and - (hyphen).
+	__Note:__ Ensure that duplicate values are not provided for MAC, Hostname, and IP in the mapping file. The Hostname should not contain the following characters: , (comma), \. (period), and _ (underscore).
 	
 	e. Provide valid DHCP range for HPC cluster under the variables `dhcp_start_ip_range` and `dhcp_end_ip_range`. 
 	
@@ -43,7 +43,7 @@ Omnia considers the following usernames as default:
 * `admin` for AWX
 * `slurm` for MariaDB
 
-7. Run `ansible-playbook appliance.yml` to the install the Omnia appliance.  
+7. Run `ansible-playbook appliance.yml` to install the Omnia appliance.  
 
 Omnia creates a log file which is available at: `/var/log/omnia.log`.
 

docs/PREINSTALL_OMNIA_APPLIANCE.md

@@ -10,7 +10,7 @@ Ensure that the following prequisites are met before installing the Omnia applia
 * To provision the bare metal servers, go to http://isoredirect.centos.org/centos/7/isos/x86_64/ and download the **CentOS-7-x86_64-Minimal-2009** ISO file.
 * For DHCP configuration, you can provide a mapping file. The provided details must be in the format: MAC, Hostname, IP. For example, `xx:xx:4B:C4:xx:44,validation01,172.17.0.81` and  `xx:xx:4B:C5:xx:52,validation02,172.17.0.82` are valid entries.  
 __Note:__ A template for mapping file is present in the `omnia/examples`, named `mapping_file.csv`. The header in the template file must not be deleted before saving the file.  
-__Note:__ Ensure that duplicate values are not provided for MAC, Hostname, and IP in the mapping file. The Hostname should not contain the following characters: , (comma), \. (period), and - (hyphen).
+__Note:__ Ensure that duplicate values are not provided for MAC, Hostname, and IP in the mapping file. The Hostname should not contain the following characters: , (comma), \. (period), and _ (underscore).
 * Connect one of the Ethernet cards on the management node to the HPC switch and the other ethernet card connected to the global network.
 * If SELinux is not disabled on the management node, disable it from `/etc/sysconfig/selinux` and restart the management node.
 * The default mode of PXE is __UEFI__, and the BIOS Legacy Mode is not supported.