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ctdb-daemon: Avoid spurious error sending ARPs for released IP

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A public IP address can be released in between (and probably before)
attempts to send ARPs.  One situation when this can occur is when a
cluster is shutting down: node A shuts down first, public IPs from
node A are taken over by node B, node B is shutdown.

Notice this when it occurs and cancel further attempts to send ARPs.

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
This commit is contained in:
Martin Schwenke 2022-06-23 14:30:34 +10:00 committed by Amitay Isaacs
parent f5a2037734
commit d62fcba7dc
1 changed files with 10 additions and 1 deletions
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11
ctdb/server/ctdb_takeover.c
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@ -373,8 +373,17 @@ static void ctdb_control_send_arp(struct tevent_context *ev,
struct ctdb_takeover_arp);
int ret;
struct ctdb_tcp_array *tcparray;
const char *iface = ctdb_vnn_iface_string(arp->vnn);
const char *iface;
/* IP address might have been released between sends */
if (arp->vnn->iface == NULL) {
DBG_INFO("Cancelling ARP send for released IP %s\n",
ctdb_addr_to_str(&arp->vnn->public_address));
talloc_free(arp);
return;
}
iface = ctdb_vnn_iface_string(arp->vnn);
ret = ctdb_sys_send_arp(&arp->addr, iface);
if (ret != 0) {
DBG_ERR("Failed to send ARP on interface %s: %s\n",