/usr/bin/onnode is in ctdb 2.5.1+debian0-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# Run commands on CTDB nodes.
# See http://ctdb.samba.org/ for more information about CTDB.
# Copyright (C) Martin Schwenke 2008
# Based on an earlier script by Andrew Tridgell and Ronnie Sahlberg.
# Copyright (C) Andrew Tridgell 2007
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <http://www.gnu.org/licenses/>.
prog=$(basename $0)
usage ()
{
cat >&2 <<EOF
Usage: onnode [OPTION] ... <NODES> <COMMAND> ...
options:
-c Run in current working directory on specified nodes.
-f Specify nodes file, overrides CTDB_NODES_FILE.
-i Keep standard input open - the default is to close it.
-n Allow nodes to be specified by name.
-o <prefix> Save standard output from each node to file <prefix>.<ip>
-p Run command in parallel on specified nodes.
-P Push given files to nodes instead of running commands.
-q Do not print node addresses (overrides -v).
-v Print node address even for a single node.
<NODES> "all", "any", "ok" (or "healthy"), "con" (or "connected"),
"rm" (or "recmaster"), "lvs" (or "lvsmaster"),
"natgw" (or "natgwlist"); or
a node number (0 base); or
a hostname (if -n is specified); or
list (comma separated) of <NODES>; or
range (hyphen separated) of node numbers.
EOF
exit 1
}
invalid_nodespec ()
{
echo "Invalid <nodespec>" >&2 ; echo >&2
usage
}
# Defaults.
current=false
parallel=false
verbose=false
quiet=false
prefix=""
names_ok=false
push=false
stdin=false
ctdb_base="${CTDB_BASE:-/etc/ctdb}"
parse_options ()
{
# $POSIXLY_CORRECT means that the command passed to onnode can
# take options and getopt won't reorder things to make them
# options ot onnode.
local temp
# Not on the previous line - local returns 0!
temp=$(POSIXLY_CORRECT=1 getopt -n "$prog" -o "cf:hno:pqvPi" -l help -- "$@")
[ $? != 0 ] && usage
eval set -- "$temp"
while true ; do
case "$1" in
-c) current=true ; shift ;;
-f) CTDB_NODES_FILE="$2" ; shift 2 ;;
-n) names_ok=true ; shift ;;
-o) prefix="$2" ; shift 2 ;;
-p) parallel=true ; shift ;;
-q) quiet=true ; shift ;;
-v) verbose=true ; shift ;;
-P) push=true ; shift ;;
-i) stdin=true ; shift ;;
--) shift ; break ;;
-h|--help|*) usage ;; # Shouldn't happen, so this is reasonable.
esac
done
[ $# -lt 2 ] && usage
nodespec="$1" ; shift
command="$@"
}
echo_nth ()
{
local n="$1" ; shift
shift $n
local node="$1"
if [ -n "$node" -a "$node" != "#DEAD" ] ; then
echo $node
else
echo "${prog}: \"node ${n}\" does not exist" >&2
exit 1
fi
}
parse_nodespec ()
{
# Subshell avoids hacks to restore $IFS.
(
IFS=","
for i in $1 ; do
case "$i" in
*-*) seq "${i%-*}" "${i#*-}" 2>/dev/null || invalid_nodespec ;;
# Separate lines for readability.
all|any|ok|healthy|con|connected) echo "$i" ;;
rm|recmaster|lvs|lvsmaster|natgw|natgwlist) echo "$i" ;;
*)
[ $i -gt -1 ] 2>/dev/null || $names_ok || invalid_nodespec
echo $i
esac
done
)
}
ctdb_status_output="" # cache
get_nodes_with_status ()
{
local all_nodes="$1"
local status="$2"
if [ -z "$ctdb_status_output" ] ; then
ctdb_status_output=$(ctdb -Y status 2>&1)
if [ $? -ne 0 ] ; then
echo "${prog}: unable to get status of CTDB nodes" >&2
echo "$ctdb_status_output" >&2
exit 1
fi
local nl="
"
ctdb_status_output="${ctdb_status_output#*${nl}}"
fi
(
local i
IFS="${IFS}:"
while IFS="" read i ; do
set -- $i # split line on colons
shift # line starts with : so 1st field is empty
local pnn="$1" ; shift
local ip="$1" ; shift
case "$status" in
healthy)
# If any bit is 1, don't match this address.
local s
for s ; do
[ "$s" != "1" ] || continue 2
done
;;
connected)
# If disconnected bit is not 0, don't match this address.
[ "$1" = "0" ] || continue
;;
*)
invalid_nodespec
esac
echo_nth "$pnn" $all_nodes
done <<<"$ctdb_status_output"
)
}
ctdb_props="" # cache
get_node_with_property ()
{
local all_nodes="$1"
local prop="$2"
local prop_node=""
if [ "${ctdb_props##:${prop}:}" = "$ctdb_props" ] ; then
# Not in cache.
prop_node=$(ctdb "$prop" -Y 2>/dev/null)
if [ $? -eq 0 ] ; then
if [ "$prop" = "natgwlist" ] ; then
prop_node="${prop_node%% *}" # 1st word
if [ "$prop_node" = "-1" ] ; then
# This works around natgwlist returning 0 even
# when there's no natgw.
prop_node=""
fi
else
# We only want the first line.
local nl="
"
prop_node="${prop_node%%${nl}*}"
fi
else
prop_node=""
fi
if [ -n "$prop_node" ] ; then
# Add to cache.
ctdb_props="${ctdb_props}${ctdb_props:+ }:${prop}:${prop_node}"
fi
else
# Get from cache.
prop_node="${ctdb_props##:${prop}:}"
prop_node="${prop_node%% *}"
fi
if [ -n "$prop_node" ] ; then
echo_nth "$prop_node" $all_nodes
else
echo "${prog}: No ${prop} available" >&2
exit 1
fi
}
get_any_available_node ()
{
local all_nodes="$1"
# We do a recursive onnode to find which nodes are up and running.
local out=$($0 -pq all ctdb pnn 2>&1)
local line
while read line ; do
local pnn="${line#PNN:}"
if [ "$pnn" != "$line" ] ; then
echo_nth "$pnn" $all_nodes
return 0
fi
# Else must be an error message from a down node.
done <<<"$out"
return 1
}
get_nodes ()
{
local all_nodes
if [ -n "$CTDB_NODES_SOCKETS" ] ; then
all_nodes="$CTDB_NODES_SOCKETS"
else
local f="${ctdb_base}/nodes"
if [ -n "$CTDB_NODES_FILE" ] ; then
f="$CTDB_NODES_FILE"
if [ ! -e "$f" -a "${f#/}" = "$f" ] ; then
# $f is relative, try in $ctdb_base
f="${ctdb_base}/${f}"
fi
fi
if [ ! -r "$f" ] ; then
echo "${prog}: unable to open nodes file \"${f}\"" >&2
exit 1
fi
all_nodes=$(sed -e 's@#.*@@g' -e 's@ *@@g' -e 's@^$@#DEAD@' "$f")
fi
local nodes=""
local n
for n in $(parse_nodespec "$1") ; do
[ $? != 0 ] && exit 1 # Required to catch exit in above subshell.
case "$n" in
all)
echo "${all_nodes//#DEAD/}"
;;
any)
get_any_available_node "$all_nodes" || exit 1
;;
ok|healthy)
get_nodes_with_status "$all_nodes" "healthy" || exit 1
;;
con|connected)
get_nodes_with_status "$all_nodes" "connected" || exit 1
;;
rm|recmaster)
get_node_with_property "$all_nodes" "recmaster" || exit 1
;;
lvs|lvsmaster)
get_node_with_property "$all_nodes" "lvsmaster" || exit 1
;;
natgw|natgwlist)
get_node_with_property "$all_nodes" "natgwlist" || exit 1
;;
[0-9]|[0-9][0-9]|[0-9][0-9][0-9])
echo_nth $n $all_nodes
;;
*)
$names_ok || invalid_nodespec
echo $n
esac
done
}
push()
{
local host="$1"
local files="$2"
local f
for f in $files ; do
$verbose && echo "Pushing $f"
case "$f" in
/*) rsync "$f" "${host}:${f}" ;;
*) rsync "${PWD}/${f}" "${host}:${PWD}/${f}" ;;
esac
done
}
fakessh ()
{
CTDB_SOCKET="$1" sh -c "$2" 3>/dev/null
}
stdout_filter ()
{
if [ -n "$prefix" ] ; then
cat >"${prefix}.${n//\//_}"
elif $verbose && $parallel ; then
sed -e "s@^@[$n] @"
else
cat
fi
}
stderr_filter ()
{
if $verbose && $parallel ; then
sed -e "s@^@[$n] @"
else
cat
fi
}
######################################################################
parse_options "$@"
ssh_opts=
if $push ; then
SSH=push
EXTRA_SSH_OPTS=""
else
$current && command="cd $PWD && $command"
if [ -n "$CTDB_NODES_SOCKETS" ] ; then
SSH=fakessh
EXTRA_SSH_OPTS=""
else
# Could "2>/dev/null || true" but want to see errors from typos in file.
[ -r "${ctdb_base}/onnode.conf" ] && . "${ctdb_base}/onnode.conf"
[ -n "$SSH" ] || SSH=ssh
if [ "$SSH" = "ssh" ] ; then
if $parallel || ! $stdin ; then
ssh_opts="-n"
fi
else
: # rsh? All bets are off!
fi
fi
fi
######################################################################
nodes=$(get_nodes "$nodespec")
[ $? != 0 ] && exit 1 # Required to catch exit in above subshell.
if $quiet ; then
verbose=false
else
# If $nodes contains a space or a newline then assume multiple nodes.
nl="
"
[ "$nodes" != "${nodes%[ ${nl}]*}" ] && verbose=true
fi
pids=""
trap 'kill -TERM $pids 2>/dev/null' INT TERM
# There's a small race here where the kill can fail if no processes
# have been added to $pids and the script is interrupted. However,
# the part of the window where it matter is very small.
retcode=0
for n in $nodes ; do
set -o pipefail 2>/dev/null
if $parallel ; then
{ exec 3>&1 ; { $SSH $ssh_opts $EXTRA_SSH_OPTS $n "$command" | stdout_filter >&3 ; } 2>&1 | stderr_filter ; } &
pids="${pids} $!"
else
if $verbose ; then
echo >&2 ; echo ">> NODE: $n <<" >&2
fi
{ exec 3>&1 ; { $SSH $ssh_opts $EXTRA_SSH_OPTS $n "$command" | stdout_filter >&3 ; } 2>&1 | stderr_filter ; }
[ $? = 0 ] || retcode=$?
fi
done
$parallel && {
for p in $pids; do
wait $p
[ $? = 0 ] || retcode=$?
done
}
exit $retcode
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