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#!/bin/bash
hosts=
group=$cluster_name
user=root
pdsh=`which pdsh 2>/dev/null`
ssh=`which qarsh 2>/dev/null`
scp=`which qacp 2>/dev/null`
command=list
format=oneline
replace="{}"
if [ x$ssh = "x" ]; then
ssh=ssh
scp=scp
fi
function helptext() {
echo "cluster-helper - A tool for running commands on multiple hosts"
echo ""
echo "Attempt to use pdsh, qarsh, or ssh (in that order) to execute commands"
echo "on mutiple hosts"
echo ""
echo "DSH groups can be configured and specified with -g instead of listing"
echo "the individual hosts every time"
echo ""
echo "Usage: cluster-helper [options] [command]"
echo ""
echo "Options:"
echo "--ssh Force the use of ssh instead of qarsh even if it available"
echo "-g, --group Specify the group to operate on/with"
echo "-w, --host Specify a host to operate on/with. May be specified multiple times"
echo "-f, --format Specifiy the output format When listing hosts or group contents"
echo " Allowed values: [oneline], long, short, pdsh, bullet"
echo ""
echo ""
echo "Commands:"
echo "--list format List the contents of a group in the specified format"
echo "--add name Add supplied (-w) hosts to the named group"
echo "--create name Create the named group with the supplied (-w) hosts"
echo "--run, -- Treat all subsequent arguments as a command to perform on"
echo " the specified command on the hosts or group"
echo "--xargs Run the supplied command having replaced any occurrences"
echo " of {} with the node name"
echo ""
echo "--copy file(s) host:file Pass subsequent arguments to scp or qacp"
echo " Any occurrences of {} are replaced with the node name"
echo "--key Install an ssh key"
echo ""
exit $1
}
while true ; do
case "$1" in
--help|-h|-\?) helptext 0;;
-x) set -x; shift;;
--ssh) ssh="ssh"; scp="scp"; pdsh=""; shift;;
-g|--group) group="$2"; shift; shift;;
-w|--host) for h in $2; do
hosts="$hosts $h";
done
shift; shift;;
-f|--format) format=$2; shift; shift;;
-I) replace=$2; shift; shift;;
--list|list) format=$2; command=list; shift; shift;;
--add|add) command=group-add; shift;;
--create|create) group="$2", command=group-create; shift; shift;;
--run|run) command=run; shift;;
--copy|copy) command=copy; shift; break ;;
--key|key) command=key; shift; break ;;
--xargs) command=xargs; shift; break ;;
--) command=run; shift; break ;;
"") break;;
*) helptext 1;;
esac
done
if [ x"$group" = x -a x"$hosts" = x ]; then
group=$CTS_GROUP
fi
function expand() {
fmt=$1
if [ x$group != x -a -f ~/.dsh/group/$group ]; then
hosts=`cat ~/.dsh/group/$group`
elif [ x$group != x ]; then
echo "Unknown group: $group" >&2
exit 1
fi
if [ "x$hosts" != x -a $fmt = oneline ]; then
echo $hosts
elif [ "x$hosts" != x -a $fmt = short ]; then
( for h in $hosts; do
echo $h | sed 's:\..*::'
done ) | tr '\n' ' '
echo ""
elif [ "x$hosts" != x -a $fmt = pdsh ]; then
( for h in $hosts; do
echo "-w $h"
done ) | tr '\n' ' '
echo ""
elif [ "x$hosts" != x -a $fmt = long ]; then
for h in $hosts; do
echo $h
done
elif [ "x$hosts" != x -a $fmt = bullet ]; then
for h in $hosts; do
echo " * $h"
done
elif [ "x$hosts" != x ]; then
echo "Unknown format: $fmt" >&2
fi
}
if [ $command = list ]; then
expand $format
elif [ $command = key ]; then
hosts=`expand oneline`
for h in $hosts; do
ssh-copy-id root@$h
done
elif [ $command = group-create ]; then
f=`mktemp`
mkdir -p ~/.dsh/group
if [ -f ~/.dsh/group/$group ]; then
echo "Overwriting existing group $group"
fi
for h in $hosts; do
echo $h >> $f
done
echo "Creating group $group in ~/.dsh/group"
sort -u $f > ~/.dsh/group/$group
rm -f $f
elif [ $command = group-add ]; then
if [ x$group = x ]; then
echo "Please specify a group to append to"
exit 1
fi
f=`mktemp`
mkdir -p ~/.dsh/group
if [ -f ~/.dsh/group/$group ]; then
cat ~/.dsh/group/$group > $f
fi
for h in $hosts; do
echo $h >> $f
done
echo "Appending hosts to group $group in ~/.dsh/group"
sort -u $f > ~/.dsh/group/$group
rm -f $f
elif [ $command = run ]; then
if [ x$pdsh != x ]; then
hosts=`expand pdsh`
$pdsh -l $user $hosts -- $*
else
hosts=`expand oneline`
for n in $hosts; do
$ssh -l $user $n -- $* < /dev/null
done
if [ x"$hosts" = x ]; then
echo "No hosts specified"
fi
fi
elif [ $command = copy ]; then
hosts=`expand oneline`
for n in $hosts; do
$scp `echo $* | sed 's@'$replace'@'$n'@'`
done
elif [ $command = xargs ]; then
hosts=`expand oneline`
for n in $hosts; do
eval `echo $* | sed 's@'$replace'@'$n'@'`
done
fi

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cluster-helper (4 KB)

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