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onnode: add "any" nodespec to select any node with running CTDB.

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In testing and other situations (e.g. eventscripts) it is necessary to
select a node where a ctdb command can be run.  The whole idea here is
to avoid nodes where ctdbd is not running and where most ctdb commands
would fail.  This implements a standard way of doing this involving a
recursive onnode command.

There is still a small window for a race, where the selected node is
suddenly shutdown, but this is unavoidable.

Signed-off-by: Martin Schwenke <martin@meltin.net>

(This used to be ctdb commit fb47cce86c0edae5caaf485f13ae7a151b6cb00d)
This commit is contained in:
Martin Schwenke 2009-09-08 15:10:20 +10:00
parent 93851d1ddf
commit 021892346c
1 changed files with 23 additions and 2 deletions
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25
ctdb/tools/onnode
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@ -35,7 +35,7 @@ Usage: onnode [OPTION] ... <NODES> <COMMAND> ...
-p Run command in parallel on specified nodes. -p Run command in parallel on specified nodes.
-q Do not print node addresses (overrides -v). -q Do not print node addresses (overrides -v).
-v Print node address even for a single node. -v Print node address even for a single node.
<NODES> "all", "ok" (or "healthy"), "con" (or "connected"), <NODES> "all", "any", "ok" (or "healthy"), "con" (or "connected"),
"rm" (or "recmaster"), "lvs" (or "lvsmaster"), "rm" (or "recmaster"), "lvs" (or "lvsmaster"),
"natgw" (or "natgwlist"); "natgw" (or "natgwlist");
or a node number (0 base); or or a node number (0 base); or
@ -112,7 +112,7 @@ parse_nodespec ()
case "$i" in case "$i" in
*-*) seq "${i%-*}" "${i#*-}" 2>/dev/null || invalid_nodespec ;; *-*) seq "${i%-*}" "${i#*-}" 2>/dev/null || invalid_nodespec ;;
# Separate lines for readability. # Separate lines for readability.
all|ok|healthy|con|connected) echo "$i" ;; all|any|ok|healthy|con|connected) echo "$i" ;;
rm|recmaster|lvs|lvsmaster|natgw|natgwlist) echo "$i" ;; rm|recmaster|lvs|lvsmaster|natgw|natgwlist) echo "$i" ;;
*) *)
[ $i -gt -1 ] 2>/dev/null || invalid_nodespec [ $i -gt -1 ] 2>/dev/null || invalid_nodespec
@ -198,6 +198,24 @@ get_node_with_property ()
fi 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 () get_nodes ()
{ {
local all_nodes local all_nodes
@ -217,6 +235,9 @@ get_nodes ()
all) all)
echo "${all_nodes//#DEAD/}" echo "${all_nodes//#DEAD/}"
;; ;;
any)
get_any_available_node "$all_nodes" || exit 1
;;
ok|healthy) ok|healthy)
get_nodes_with_status "$all_nodes" "healthy" || exit 1 get_nodes_with_status "$all_nodes" "healthy" || exit 1
;; ;;