#! /bin/bash

ipaddlastnumber=$(ifconfig | grep 255.255.0.0 |awk '{ print $2}' | awk -F'.' '{print $4}')

## 1
### nfs_node.txt
### Configuring compute nodes (NFS clients)
### reference: https://www.itzgeek.com/how-tos/linux/centos-how-tos/how-to-setup-nfs-server-on-centos-7-rhel-7-fedora-22.html
#### default values. dont change ###
HOSTNAME=compute-0-$ipaddlastnumber
hostnamectl set-hostname $HOSTNAME
#### default values. dont change ###


## 5. Doing NFS configuration in current node
# Check NFS Share
# Before mounting the NFS share, check the NFS shares available on the NFS server by running the following command on the NFS client.

showmount -e 192.168.1.10

# Mount the shared directory in the NFS clients (the share directory in the frontend is supposed to be /export/share
mkdir /share
mount 192.168.1.10:/export/share /share

#Verify the mounted share on the NFS client using mount command.

mount | grep nfs

#Also, you can use the df -hT command to check the mounted NFS share.

df -hT

#Create a file on the mounted directory to verify the read and write access on NFS share.

touch /share/test_$HOSTNAME

#If the above command returns no error, you have working NFS setup

# To mount the shares automatically on every reboot, you would need to modify /etc/fstab file of your NFS client.

cp /etc/fstab /etc/fstab.orig
echo '192.168.1.10:/export/share /share nfs   nosuid,rw,sync,hard,intr  0  0' >> /etc/fstab

# Reload the entries in the modified /etc/fstab, by using the mount command:	
mount -av

### replace /etc/hosts file by that shared in /share/cluster/hosts, then add to hosts the identify of current node
mv /etc/hosts /etc/hosts.orig
ln -s /share/cluster/hosts /etc/
echo 192.168.1.$ipaddlastnumber $HOSTNAME.local $HOSTNAME c$ipaddlastnumber >> /share/cluster/hosts
cat /share/cluster/hosts | sort | uniq > temp
mv temp /share/cluster/hosts


#### customize /etc/ssh in a fresh node, so that ssh can work seamlessly

# edit /etc/ssh/ssh_config, so that it reads 'GSSAPIAuthentication no'

# edit /etc/ssh/sshd_config, so that it reads 'GSSAPIAuthentication no \ UseDNS no'

#edit /etc/resolv.conf, so that it reads 'search local \ nameserver 192.168.1.10'. This line could be overwritten when setting the eth0 using NetworkManager.
#### end of customize /etc/ssh in a fresh node


### customize the root for the present node
mkdir -p /state/partition1
chmod -R 777 /state/partition1
if [[ -e ~/.ssh/id_rsa.pub ]]; then echo "pub rsa exists. Will not creat any."; else ssh-keygen -t rsa; fi
sh /share/apps/local/bin/gen_bashrc.txt
source ~/.bashrc

### if the nfs mount has been successful at this stage, the node should be able to see the shared directory /share/apps/local/bin/
sh /share/apps/local/bin/gen_bashrc-root
source ~/.bashrc

# edit /etc/ssh/ssh_config, so that it reads 'GSSAPIAuthentication no'
# edit /etc/ssh/sshd_config, so that it reads 'GSSAPIAuthentication no \ UseDNS no'

cp /etc/ssh/sshd_config /etc/ssh/sshd_config.orig
sed -i 's/GSSAPIAuthentication yes/GSSAPIAuthentication no/g' /etc/ssh/sshd_config
sed -i 's/UseDNS yes/UseDNS no/g' /etc/ssh/sshd_config

sed -i 's/GSSAPIAuthentication yes/GSSAPIAuthentication no/g' /etc/ssh/ssh_config
sed -i 's/UseDNS yes/UseDNS no/g' /etc/ssh/ssh_config
#### end of customize /etc/ssh in a fresh node

rpm -ivh /share/apps/configrepo/sshpass-1.06-2.el7.x86_64.rpm
#yum install -y epel-release sshpass
basic_packages.txt