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#!/bin/bash
# Script to verify the Master and Slave Gluster compatibility.
# To use ./gverify <master volume> <slave host> <slave volume>
# Returns 0 if master and slave compatible.
BUFFER_SIZE=1000;
slave_log_file=`gluster --print-logdir`/geo-replication-slaves/slave.log
function SSHM()
{
ssh -q \
-oPasswordAuthentication=no \
-oStrictHostKeyChecking=no \
-oControlMaster=yes \
"$@";
}
function cmd_master()
{
VOL=$1;
local cmd_line;
cmd_line=$(cat <<EOF
function do_verify() {
v=\$1;
d=\$(mktemp -d 2>/dev/null);
glusterfs -s localhost --xlator-option="*dht.lookup-unhashed=off" --volfile-id \$v -l $slave_log_file \$d;
i=\$(stat -c "%i" \$d);
if [[ "\$i" -ne "1" ]]; then
echo 0:0;
exit 1;
fi;
cd \$d;
available_size=\$(df \$d | tail -1 | awk "{print \\\$2}");
umount -l \$d;
rmdir \$d;
ver=\$(gluster --version | head -1 | cut -f2 -d " ");
echo \$available_size:\$ver;
};
cd /tmp;
[ x$VOL != x ] && do_verify $VOL;
EOF
);
echo $cmd_line;
}
function cmd_slave()
{
VOL=$1;
local cmd_line;
cmd_line=$(cat <<EOF
function do_verify() {
v=\$1;
d=\$(mktemp -d 2>/dev/null);
glusterfs -s localhost --xlator-option="*dht.lookup-unhashed=off" --volfile-id \$v -l $slave_log_file \$d;
i=\$(stat -c "%i" \$d);
if [[ "\$i" -ne "1" ]]; then
echo 0:0;
exit 1;
fi;
cd \$d;
available_size=\$(df \$d | tail -1 | awk "{print \\\$4}");
no_of_files=\$(find \$d -maxdepth 0 -empty);
umount -l \$d;
rmdir \$d;
ver=\$(gluster --version | head -1 | cut -f2 -d " ");
echo \$available_size:\$ver:\$no_of_files:;
};
cd /tmp;
[ x$VOL != x ] && do_verify $VOL;
EOF
);
echo $cmd_line;
}
function master_stats()
{
MASTERVOL=$1;
local cmd_line;
cmd_line=$(cmd_master $MASTERVOL);
bash -c "$cmd_line";
}
function slave_stats()
{
SLAVEHOST=$1;
SLAVEVOL=$2;
local cmd_line;
cmd_line=$(cmd_slave $SLAVEVOL);
SSHM $SLAVEHOST bash -c "'$cmd_line'";
}
function main()
{
log_file=$4
> $log_file
ping -w 5 $2;
if [ $? -ne 0 ]; then
echo "$2 not reachable." > $log_file
exit 1;
fi;
ERRORS=0;
master_data=$(master_stats $1);
slave_data=$(slave_stats $2 $3);
master_size=$(echo $master_data | cut -f1 -d':');
slave_size=$(echo $slave_data | cut -f1 -d':');
master_version=$(echo $master_data | cut -f2 -d':');
slave_version=$(echo $slave_data | cut -f2 -d':');
slave_no_of_files=$(echo $slave_data | cut -f3 -d':');
slave_vol_test=$5
if [[ "x$master_size" = "x" || "x$master_version" = "x" || "$master_size" -eq "0" ]]; then
echo "Unable to fetch master volume details. Please check the master cluster and master volume." > $log_file;
exit 1;
fi;
if [[ "x$slave_size" = "x" || "x$slave_version" = "x" || "$slave_size" -eq "0" ]]; then
echo "Unable to fetch slave volume details. Please check the slave cluster and slave volume." > $log_file;
exit 1;
fi;
if [ ! -z $slave_vol_test ]; then
exit $ERRORS;
fi
if [ ! $slave_size -ge $(($master_size - $BUFFER_SIZE )) ]; then
echo "Total size of master is greater than available size of slave." >> $log_file;
ERRORS=$(($ERRORS + 1));
fi;
if [ -z $slave_no_of_files ]; then
echo "$2::$3 is not empty. Please delete existing files in $2::$3 and retry, or use force to continue without deleting the existing files." >> $log_file;
ERRORS=$(($ERRORS + 1));
fi;
if [[ $master_version > $slave_version ]]; then
echo "Gluster version mismatch between master and slave." >> $log_file;
ERRORS=$(($ERRORS + 1));
fi;
exit $ERRORS;
}
main "$@";
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