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ctdb-scripts: Wait until IPv6 addresses are not "tentative"

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There are a few potential failure modes when adding an IPv6 address.
It takes a little while of duplicate address detection to complete, so
wait for a while.  After a timeout, also need to check to see if
duplicate address detection failed - if it did then actually drop the
IP address.

This really needs some careful thinking.  If CTDB disappears on a node
but the node's IP addresses are still on interfaces then the above
failure mode could cause the takeover nodes to become banned.

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
This commit is contained in:
Martin Schwenke 2014-11-21 17:33:21 +11:00 committed by Martin Schwenke
parent d4212bd6a5
commit d0b2375c3d
1 changed files with 23 additions and 0 deletions
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23
ctdb/config/functions
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@ -869,6 +869,29 @@ add_ip_to_iface ()
echo "Failed to add $_ip/$_maskbits on dev $_iface"
return 1
}
# Wait 5 seconds for IPv6 addresses to stop being tentative...
if [ -z "$_bcast" ] ; then
for _x in $(seq 1 10) ; do
ip addr show to "${_ip}/128" | grep -q "tentative" || break
sleep 0.5
done
# If the address was a duplicate then it won't be on the
# interface so flag an error.
_t=$(ip addr show to "${_ip}/128")
case "$_t" in
"")
echo "Failed to add $_ip/$_maskbits on dev $_iface"
return 1
;;
*tentative*|*dadfailed*)
echo "Failed to add $_ip/$_maskbits on dev $_iface"
ip addr del "$_ip/$_maskbits" dev "$_iface"
return 1
;;
esac
fi
}
delete_ip_from_iface()