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# (Optional) fix vi bug in some versions of Mobaxterm (changes first letter of edited file after opening to "g")
vi ~/.vimrc  ==> repeat for root/ubuntu and any other user which will edit files.
# Add the following 2 lines.
syntax on
set background=dark



# Add hostname of kubernetes nodes(master and workers) to /etc/hosts
sudo vi /etc/hosts
# <IP address> <hostname>

# Turn off firewall and allow all incoming HTTP connections through IPTABLES
sudo ufw disable
sudo iptables -I INPUT -j ACCEPT

# Fix server timezone and select your timezone.
sudo dpkg-reconfigure tzdata


# (Optional) create a bash history file as the Ubuntu user so that it does not accidently get created as the root user.  
touch ~/.bash_history  

# (Optional) turn on ssh password authentication and give ubuntu user a password  if you do not like using ssh keys. 
# Set the "PasswordAuthentication yes" in the /etc/ssh/sshd_config file and then set the ubuntu password
sudo vi /etc/ssh/sshd_config;sudo systemctl restart sshd;sudo passwd ubuntu;

# Update the VM with the lates core packages  
sudo apt clean
sudo apt update
sudo apt -y full-upgrade
sudo reboot

# Setup ntp on your image if needed.  It is important that all the VM's clocks are in synch or it will cause problems joining kubernetes nodes to the kubernetes cluster
sudo apt install ntp
sudo apt install ntpdate 

# It is recommended to add local ntp-hostname or ntp server's IP address to the ntp.conf 
# Sync up your vm clock with that of your ntp server. The best choice for the ntp server is one which is different form Kubernetes VMs... a solid machine. Make sure you can ping it!
# A service restart would be needed to synch the time up. You can run them from command line for immediate change.


sudo vi /etc/ntp.conf
# Append the following lines to /etc/ntp.conf, to make them permanent.

date 
sudo service ntp stop
sudo ntpdate -s <ntp-hostname | ntp server's IP address>  ==>e.g.: sudo ntpdate -s 10.247.5.11
sudo service ntp start
date


# Some of the clustering scripts (switch_voting.sh and sdncappc_cluster.sh) require JSON parsing, so install jq on th masters only
sudo apt install jq