#!/bin/bash

# Run this script with root permission
# on the master node of the GlusterFS cluster

# Block device
TARGETDEV="/dev/vdb"
# Directory serving the Gluster filesystem
TARGETDIR="/glusterfs/vol"
# Gluster filesystem volume available for clients
TARGETVOL="gvol"
# Name of the Gluster cluster
CLUSTERNAME="gluster-test"
MINIONLASTIND="8"
# Saving Gluster server information
HOSTNAMEFN="gluster_server_hostnames.txt"
HOSTIPFN="gluster_server_ips.txt"

# Install the server
echo "... install required software on ${CLUSTERNAME}-master"
apt install glusterfs-server -y
systemctl enable --now glusterd
for ind in $(seq 0 ${MINIONLASTIND})
do
echo "... install required software on ${CLUSTERNAME}-minion-${ind}"
ssh ${CLUSTERNAME}-minion-${ind} "apt install glusterfs-server -y; systemctl enable --now glusterd"
done

echo
read -p "[CHECK] Are softwares installed successfully on all nodes? [YyNn]" -n 1 -r
echo
if [[ ! $REPLY =~ ^[Yy]$ ]]
then
echo "[STOP] please, re-run the script to make sure that all nodes have the softwares."
exit 1
fi

# Probing
for ind in $(seq 0 ${MINIONLASTIND})
do
echo "... probing ${CLUSTERNAME}-minion-${ind}"
gluster peer probe ${CLUSTERNAME}-minion-${ind}
done

# Prepare the block device with the XFS filesystem
echo "... preparing the block dev ${TARGETDEV} on ${CLUSTERNAME}-master"
umount -f ${TARGETDEV}
mkfs.xfs -f -i size=512 ${TARGETDEV}
for ind in $(seq 0 ${MINIONLASTIND})
do
echo "... preparing the block dev ${TARGETDEV} on ${CLUSTERNAME}-minion-${ind}"
ssh ${CLUSTERNAME}-minion-${ind} "umount -f ${TARGETDEV}; mkfs.xfs -f -i size=512 ${TARGETDEV}"
done

# Prepare the directory
echo "... creating directory on ${CLUSTERNAME}-master"
mkdir -p ${TARGETDIR}
for ind in $(seq 0 ${MINIONLASTIND})
do
echo "... creating directory on ${CLUSTERNAME}-minion-${ind}"
ssh ${CLUSTERNAME}-minion-${ind} "mkdir -p ${TARGETDIR}"
done

# Mount the block device
echo "... mounting ${TARGETDEV} on ${CLUSTERNAME}-master"
mount -t xfs ${TARGETDEV} ${TARGETDIR}
for ind in $(seq 0 ${MINIONLASTIND})
do
echo "... mounting ${TARGETDEV} on ${CLUSTERNAME}-minion-${ind}"
ssh ${CLUSTERNAME}-minion-${ind} "mount -t xfs ${TARGETDEV} ${TARGETDIR}"
done

# Information
gluster --version
gluster peer status

# Produce the Gluster filesystem volume with the above directory
VOLSTR="${CLUSTERNAME}-master:${TARGETDIR}"
for ind in $(seq 0 ${MINIONLASTIND})
do
VOLSTR="${VOLSTR} ${CLUSTERNAME}-minion-${ind}:${TARGETDIR}"
done
gluster volume create ${TARGETVOL} ${VOLSTR} force
# Make the volume available
gluster volume start ${TARGETVOL}

# Information
# (optional)
gluster volume info
gluster volume status

echo "Use ${HOSTNAMEFN} for clients"
gluster volume info | grep "^Brick[0-9]*:" | grep -v 'Bricks:' | awk -F':' '{print $2}' | xargs | tee ${HOSTNAMEFN}
echo "Use ${HOSTIPFN} for clients"
gluster volume info | grep "^Brick[0-9]*:" | grep -v 'Bricks:' | awk -F':' '{print $2}' | xargs -I {} grep -m 1 "{}" /etc/hosts | cut -d' ' -f1 | xargs | tee ${HOSTIPFN}

#!/bin/bash

# Name of the cluster which defines the clients' names
CLUSTERNAME="lice"
# Last integer index of the minions in the cluster
MINIONLASTIND="14"
# Directory name which is a mount point on clients
TARGETDIR="/mnt/gluster-input"

# IP of the Gluster server
GLUSTERSERVERIP="10.0.110.167 10.0.110.92 10.0.110.124 10.0.110.68 10.0.110.104 10.0.110.172 10.0.110.44 10.0.110.147 10.0.110.67 10.0.110.185 10.0.110.31 10.0.110.225"
# Name of the Gluster server
GLUSTERSERVERNAME="gluster-input-master gluster-input-minion-0 gluster-input-minion-1 gluster-input-minion-2 gluster-input-minion-3 gluster-input-minion-4 gluster-input-minion-5 gluster-input-minion-6 gluster-input-minion-7 gluster-input-minion-8 gluster-input-minion-9 gluster-input-minion-10"

IPARRAY=($GLUSTERSERVERIP)
NAMEARRAY=($GLUSTERSERVERNAME)

# Deleting exisitng entries in /etc/hosts
echo "Deleting existing entries in /etc/hosts"
# ... Master
for (( i=0; i<=${#IPARRAY[@]}; i++ ))
do
sed -i "/ ${NAMEARRAY[$i]}$/d" /etc/hosts
sed -i "/ ${IPARRAY[$i]}$/d" /etc/hosts
done
# ... Minion
for ind in $(seq 0 ${MINIONLASTIND})
do
for (( i=0; i<=${#IPARRAY[@]}; i++ ))
do
ssh ${CLUSTERNAME}-minion-${ind} "sed -i \"/${NAMEARRAY[$i]}/d\" /etc/hosts; sed -i \"/${IPARRAY[$i]}/d\" /etc/hosts"
done
done


# Updating /etc/hosts
echo "Adding entries in /etc/hosts"
# ... Master
for (( i=0; i<=${#IPARRAY[@]}; i++ ))
do
echo ${IPARRAY[$i]} ${NAMEARRAY[$i]} >> /etc/hosts
done
# ... Minion
for ind in $(seq 0 ${MINIONLASTIND})
do
for (( i=0; i<=${#IPARRAY[@]}; i++ ))
do
ssh ${CLUSTERNAME}-minion-${ind} "echo ${IPARRAY[$i]} ${NAMEARRAY[$i]} >> /etc/hosts"
done
done


# Rest of tasks 
echo "Running the relevant commands"
RUNCMD="apt -y install glusterfs-client; mkdir ${TARGETDIR}; mount -t glusterfs ${NAMEARRAY[0]}:/gvol ${TARGETDIR}; chmod -R 777 ${TARGETDIR}"
# ... Master
echo "... setuping on ${CLUSTERNAME}-master"
echo $RUNCMD | bash
# ... Minion
for ind in $(seq 0 ${MINIONLASTIND})
do
echo "... setuping on ${CLUSTERNAME}-minion-${ind}"
ssh ${CLUSTERNAME}-minion-${ind} "${RUNCMD}"
done