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b4b3ce |
From cc23c5523a0185fa557a5ab9056d50a60300d12a Mon Sep 17 00:00:00 2001
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b4b3ce |
From: John Eckersberg <jeckersb@redhat.com>
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b4b3ce |
Date: Tue, 16 Oct 2018 16:21:25 -0400
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b4b3ce |
Subject: [PATCH] rabbitmq-cluster: fail monitor when node is in minority
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b4b3ce |
partition
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b4b3ce |
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b4b3ce |
It's possible for mnesia to still be running, but for mnesia to be
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b4b3ce |
partitioned. And it's also possible to get into this state without
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b4b3ce |
pacemaker seeing the node go down so no corrective action is taken.
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b4b3ce |
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b4b3ce |
When monitoring, check the number of nodes that pacemaker thinks is
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b4b3ce |
running, and compare to the number of nodes that mnesia thinks is
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b4b3ce |
running. If mnesia only sees a minority of the total nodes, fail it
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b4b3ce |
so corrective action can be taken to rejoin the cluster.
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b4b3ce |
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b4b3ce |
This also adds a new function, rmq_app_running, which simply checks
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b4b3ce |
whether the app is running or not and does not care about the
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b4b3ce |
partition status. This is now used instead of the full monitor in a
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b4b3ce |
few places where we don't care about partition state.
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b4b3ce |
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b4b3ce |
Resolves: RHBZ#1639826
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b4b3ce |
---
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b4b3ce |
heartbeat/rabbitmq-cluster | 28 +++++++++++++++++++++++++---
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b4b3ce |
1 file changed, 25 insertions(+), 3 deletions(-)
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b4b3ce |
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b4b3ce |
diff --git a/heartbeat/rabbitmq-cluster b/heartbeat/rabbitmq-cluster
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b4b3ce |
index 204917475..78b2bbadf 100755
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b4b3ce |
--- a/heartbeat/rabbitmq-cluster
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b4b3ce |
+++ b/heartbeat/rabbitmq-cluster
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b4b3ce |
@@ -178,10 +178,31 @@ remove_pid () {
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b4b3ce |
rm -f ${RMQ_PID_FILE} > /dev/null 2>&1
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b4b3ce |
}
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b4b3ce |
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b4b3ce |
+rmq_app_running() {
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b4b3ce |
+ if $RMQ_CTL eval 'application:which_applications().' | grep -q '{rabbit,'; then
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b4b3ce |
+ ocf_log debug "RabbitMQ application is running"
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b4b3ce |
+ return $OCF_SUCCESS
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b4b3ce |
+ else
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b4b3ce |
+ ocf_log debug "RabbitMQ application is stopped"
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b4b3ce |
+ return $OCF_NOT_RUNNING
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b4b3ce |
+ fi
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b4b3ce |
+}
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b4b3ce |
+
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b4b3ce |
rmq_monitor() {
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b4b3ce |
local rc
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b4b3ce |
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b4b3ce |
if $RMQ_CTL eval 'rabbit_mnesia:cluster_status_from_mnesia().' | grep -q '^{ok'; then
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b4b3ce |
+ pcs_running=$(rmq_join_list | wc -w)
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b4b3ce |
+ ocf_log debug "Pacemaker thinks ${pcs_running} RabbitMQ nodes are running"
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b4b3ce |
+ rmq_running=$($RMQ_CTL eval 'length(mnesia:system_info(running_db_nodes)).')
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b4b3ce |
+ ocf_log debug "RabbitMQ thinks ${rmq_running} RabbitMQ nodes are running"
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b4b3ce |
+
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b4b3ce |
+ if [ $(( $rmq_running * 2 )) -lt $pcs_running ]; then
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b4b3ce |
+ ocf_log info "RabbitMQ is a minority partition, failing monitor"
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b4b3ce |
+ rmq_delete_nodename
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b4b3ce |
+ return $OCF_ERR_GENERIC
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b4b3ce |
+ fi
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b4b3ce |
+
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b4b3ce |
ocf_log debug "RabbitMQ server is running normally"
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b4b3ce |
rmq_write_nodename
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b4b3ce |
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b4b3ce |
@@ -215,7 +236,7 @@ rmq_init_and_wait()
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b4b3ce |
return $OCF_ERR_GENERIC
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b4b3ce |
fi
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b4b3ce |
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b4b3ce |
- rmq_monitor
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b4b3ce |
+ rmq_app_running
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b4b3ce |
return $?
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b4b3ce |
}
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b4b3ce |
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b4b3ce |
@@ -236,6 +257,7 @@ rmq_start_first()
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b4b3ce |
if [ $rc -eq 0 ]; then
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b4b3ce |
rc=$OCF_SUCCESS
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b4b3ce |
ocf_log info "cluster bootstrapped"
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b4b3ce |
+ rmq_write_nodename
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b4b3ce |
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b4b3ce |
if [ -n "$OCF_RESKEY_set_policy" ]; then
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b4b3ce |
# do not quote set_policy, we are passing in arguments
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b4b3ce |
@@ -492,7 +514,7 @@ rmq_stop() {
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b4b3ce |
end.
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b4b3ce |
"
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b4b3ce |
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b4b3ce |
- rmq_monitor
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b4b3ce |
+ rmq_app_running
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b4b3ce |
if [ $? -eq $OCF_NOT_RUNNING ]; then
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b4b3ce |
return $OCF_SUCCESS
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b4b3ce |
fi
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b4b3ce |
@@ -508,7 +530,7 @@ rmq_stop() {
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b4b3ce |
#TODO add kill logic
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b4b3ce |
stop_wait=1
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b4b3ce |
while [ $stop_wait = 1 ]; do
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b4b3ce |
- rmq_monitor
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
b4b3ce |
+ rmq_app_running
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
b4b3ce |
rc=$?
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
b4b3ce |
if [ "$rc" -eq $OCF_NOT_RUNNING ]; then
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
b4b3ce |
stop_wait=0
|