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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.
# Considering buffer_size 100MB
BUFFER_SIZE=104857600;
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 $slave_log_file \$d;
i=\$(stat -c "%i" \$d);
if [[ "\$i" -ne "1" ]]; then
echo 0:0;
exit 1;
fi;
cd \$d;
disk_size=\$(df -B1 \$d | tail -1 | awk "{print \\\$2}");
used_size=\$(df -B1 \$d | tail -1 | awk "{print \\\$3}");
umount -l \$d;
rmdir \$d;
ver=\$(gluster --version | head -1 | cut -f2 -d " ");
echo \$disk_size:\$used_size:\$ver;
};
cd /tmp;
[ x$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 $slave_log_file \$d;
i=\$(stat -c "%i" \$d);
if [[ "\$i" -ne "1" ]]; then
echo 0:0;
exit 1;
fi;
cd \$d;
disk_size=\$(df -B1 \$d | tail -1 | awk "{print \\\$2}");
available_size=\$(df -B1 \$d | tail -1 | awk "{print \\\$3}");
no_of_files=\$(find \$d -maxdepth 0 -empty);
umount -l \$d;
rmdir \$d;
ver=\$(gluster --version | head -1 | cut -f2 -d " ");
echo \$disk_size:\$used_size:\$ver:\$no_of_files;
};
cd /tmp;
[ x$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
# Use FORCE_BLOCKER flag in the error message to differentiate
# between the errors which the force command should bypass
ping -w 5 $2;
if [ $? -ne 0 ]; then
echo "FORCE_BLOCKER|$2 not reachable." > $log_file
exit 1;
fi;
ssh -oNumberOfPasswordPrompts=0 $2 "echo Testing_Passwordless_SSH";
if [ $? -ne 0 ]; then
echo "FORCE_BLOCKER|Passwordless ssh login has not been setup with $2." > $log_file
exit 1;
fi;
ERRORS=0;
master_data=$(master_stats $1);
slave_data=$(slave_stats $2 $3);
master_disk_size=$(echo $master_data | cut -f1 -d':');
slave_disk_size=$(echo $slave_data | cut -f1 -d':');
master_used_size=$(echo $master_data | cut -f2 -d':');
slave_used_size=$(echo $slave_data | cut -f2 -d':');
master_version=$(echo $master_data | cut -f3 -d':');
slave_version=$(echo $slave_data | cut -f3 -d':');
slave_no_of_files=$(echo $slave_data | cut -f4 -d':');
if [[ "x$master_disk_size" = "x" || "x$master_version" = "x" || "$master_disk_size" -eq "0" ]]; then
echo "FORCE_BLOCKER|Unable to fetch master volume details. Please check the master cluster and master volume." > $log_file;
exit 1;
fi;
if [[ "x$slave_disk_size" = "x" || "x$slave_version" = "x" || "$slave_disk_size" -eq "0" ]]; then
echo "FORCE_BLOCKER|Unable to fetch slave volume details. Please check the slave cluster and slave volume." > $log_file;
exit 1;
fi;
# The above checks are mandatory and force command should be blocked
# if they fail. The checks below can be bypassed if force option is
# provided hence no FORCE_BLOCKER flag.
if [ "$slave_disk_size" -lt "$master_disk_size" ]; then
echo "Total disk size of master is greater than disk size of slave." >> $log_file;
ERRORS=$(($ERRORS + 1));
fi
effective_master_used_size=$(( $master_used_size + $BUFFER_SIZE ))
slave_available_size=$(( $slave_disk_size - $slave_used_size ))
master_available_size=$(( $master_disk_size - $effective_master_used_size ));
if [ "$slave_available_size" -lt "$master_available_size" ]; then
echo "Total available 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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