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|
#!/bin/sh
if [ -z "$CTDB_BASE" ] ; then
export CTDB_BASE="/usr/local/etc/ctdb"
fi
. "${CTDB_BASE}/functions"
load_script_options "failover" "91.lvs"
# Default LVS nodes file location
[ -n "$CTDB_LVS_NODES" ] || CTDB_LVS_NODES="${CTDB_BASE}/lvs_nodes"
if [ -z "$CTDB" ] ; then
CTDB=ctdb
fi
############################################################
usage ()
{
cat <<EOF
$0 <option>
<option> is one of:
leader Display node number of leader node
list List node number and private IP address of usable nodes in group
status Show status of all nodes in LVS group
EOF
exit 1
}
nodestatus_X=""
# Fields are:
# Node|IP|Disconnected|Banned|Disabled|Unhealthy|Stopped|Inactive|PartiallyOnline|ThisNode
get_nodestatus_X ()
{
# Result is cached in global variable nodestatus_X
[ -n "$nodestatus_X" ] || \
nodestatus_X=$($CTDB -X nodestatus all |
sed -e '1d' -e 's@^|@@' -e 's@|$@@')
}
get_nodestatus ()
{
# Result is cached in global variable nodestatus
[ -n "$nodestatus" ] || nodestatus=$($CTDB nodestatus all)
case $? in
# $CTDB nodestatus returns 255 on failure
0|255) return 0 ;;
*) return 1 ;;
esac
}
get_lvs_nodes ()
{
# Result is cached in global variable lvs_nodes
if [ -n "$lvs_nodes" ] ; then
return
fi
if [ ! -r "$CTDB_LVS_NODES" ] ; then
return 1
fi
lvs_nodes=$(cat "$CTDB_LVS_NODES") || return 1
# Sanity check file contents here
while read _ip _options ; do
# Skip comments
case "$_ip" in
\#*) continue ;;
esac
case "$_options" in
follower-only|"") : ;;
*) die "${prog}: Invalid options \"${_options}\" in \"$CTDB_LVS_NODES\""
esac
done <<EOF
$lvs_nodes
EOF
return 0
}
# Print PNN and IP address of given nodes meeting the criteria for
# usable LVS nodes. That is, either those that are healthy or, if no
# healthy nodes, then nodes that are active and not-disabled.
# Return codes: 0 = nodes found, 255 = no nodes found, 10 = error.
filter_nodes ()
{
# $_ns is an @-delimited list of nodes to be considered
_ns="$1"
get_nodestatus_X
[ -n "$nodestatus_X" ] || return 10
# Now filter by $_ns and by status of nodes...
# Note that the 2 awk invocations below have "||" between
# them, so the first to succeed will print the nodes.
# First try for a fully active and healthy node, so must not
# be DISABLED, UNHEALTHY or INACTIVE (last covers
# DISCONNECTED, BANNED or STOPPED)
awk -F '|' -v ns="$_ns" '
BEGIN { ret = 255 }
ns ~ "@" $2 "@" && $5 == 0 && $6 == 0 && $8 == 0 {
print $1, $2 ; ret=0
}
END { exit ret }
' <<EOF ||
$nodestatus_X
EOF
# Not found? UNHEALTHY do, so node must not be INACTIVE or
# DISABLED
awk -F '|' -v ns="$_ns" '
BEGIN { ret = 255 }
ns ~ "@" $2 "@" && $5 == 0 && $8 == 0 {
print $1, $2 ; ret=0
}
END { exit ret }
' <<EOF
$nodestatus_X
EOF
}
# Print the PNN of the LVS leader node
find_leader ()
{
get_lvs_nodes || \
die "${prog}: LVS nodes file \"$CTDB_LVS_NODES\" not found"
# $_ms is an @-delimited list of nodes that are allowed to be the leader
_ms="@"
while read _ip _options ; do
case "$_options" in
"") _ms="${_ms}${_ip}@" ;;
esac
done <<EOF
$lvs_nodes
EOF
_leader_candidates=$(filter_nodes "$_ms") || return $?
echo "${_leader_candidates%% *}"
}
# List all usable nodes in the LVS group
nodes_list ()
{
get_lvs_nodes || \
die "${prog}: LVS nodes file \"$CTDB_LVS_NODES\" not found"
# $_ns is a @-delimited list of nodes in the LVS group
_ns="@"
while read _ip _options ; do
_ns="${_ns}${_ip}@"
done <<EOF
$lvs_nodes
EOF
_usable_nodes=$(filter_nodes "$_ns")
case $? in
0) : ;;
255) exit 0 ;; # Return 0 even if no usable nodes
*) exit 10 ;;
esac
awk '{ print $1, $2 }'<<EOF
$_usable_nodes
EOF
}
# Print the status of all nodes in the LVS group, along with a count
nodes_status ()
{
get_lvs_nodes || \
die "${prog}: LVS nodes file \"$CTDB_LVS_NODES\" not found"
get_nodestatus
[ -n "$nodestatus" ] || exit 10
# $_ns is a @-delimited list of nodes in the LVS group
_ns="@"
while read _ip _options ; do
_ns="${_ns}${_ip}@"
done <<EOF
$lvs_nodes
EOF
# Print status of nodes in $_ns, along with node count
awk -v ns="$_ns" 'ns ~ "@" $2 "@" { print }' <<EOF
$nodestatus
EOF
}
# For backward compatibility
prog=$(basename "$0")
cmd="$1"
case "$cmd" in
leader) find_leader ;;
list) nodes_list ;;
status) nodes_status ;;
*) usage ;;
esac
|
