File: galera

package info (click to toggle)
resource-agents 1%3A4.0.0~rc1-4
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 3,644 kB
  • ctags: 2,191
  • sloc: sh: 47,713; ansic: 4,074; perl: 3,457; makefile: 663; xml: 89
file content (987 lines) | stat: -rwxr-xr-x 30,443 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
#!/bin/sh
#
# Copyright (c) 2014 David Vossel <davidvossel@gmail.com>
#                    All Rights Reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like.  Any license provided herein, whether implied or
# otherwise, applies only to this software file.  Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#

##
# README.
# 
# This agent only supports being configured as a multistate Master
# resource.
#
# Slave vs Master role:
#
# During the 'Slave' role, galera instances are in read-only mode and
# will not attempt to connect to the cluster. This role exists as
# a means to determine which galera instance is the most up-to-date. The
# most up-to-date node will be used to bootstrap a galera cluster that
# has no current members.
#
# The galera instances will only begin to be promoted to the Master role
# once all the nodes in the 'wsrep_cluster_address' connection address
# have entered read-only mode. At that point the node containing the
# database that is most current will be promoted to Master.
#
# Once the first Master instance bootstraps the galera cluster, the
# other nodes will join the cluster and start synchronizing via SST.
# They will stay in Slave role as long as the SST is running. Their
# promotion to Master will happen once synchronization is finished.
#
# Example: Create a galera cluster using nodes rhel7-node1 rhel7-node2 rhel7-node3
#
# pcs resource create db galera enable_creation=true \
# wsrep_cluster_address="gcomm://rhel7-auto1,rhel7-auto2,rhel7-auto3" meta master-max=3 --master
#
# By setting the 'enable_creation' option, the database will be automatically 
# generated at startup. The meta attribute 'master-max=3' means that all 3
# nodes listed in the wsrep_cluster_address list will be allowed to connect
# to the galera cluster and perform replication.
#
# NOTE: If you have more nodes in the pacemaker cluster then you wish
# to have in the galera cluster, make sure to use location contraints to prevent
# pacemaker from attempting to place a galera instance on a node that is
# not in the 'wsrep_cluster_address" list. 
#
##

#######################################################################
# Initialization:

: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs
. ${OCF_FUNCTIONS_DIR}/mysql-common.sh

# It is common for some galera instances to store
# check user that can be used to query status
# in this file
if [ -f "/etc/sysconfig/clustercheck" ]; then
    . /etc/sysconfig/clustercheck
elif [ -f "/etc/default/clustercheck" ]; then
    . /etc/default/clustercheck
fi

#######################################################################

usage() {
  cat <<UEND
usage: $0 (start|stop|validate-all|meta-data|monitor|promote|demote)

$0 manages a galera Database as an HA resource.

The 'start' operation starts the database.
The 'stop' operation stops the database.
The 'status' operation reports whether the database is running
The 'monitor' operation reports whether the database seems to be working
The 'promote' operation makes this mysql server run as master
The 'demote' operation makes this mysql server run as slave
The 'validate-all' operation reports whether the parameters are valid

UEND
}

meta_data() {
   cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="galera">
<version>1.0</version>

<longdesc lang="en">
Resource script for managing galara database.
</longdesc>
<shortdesc lang="en">Manages a galara instance</shortdesc>
<parameters>

<parameter name="binary" unique="0" required="0">
<longdesc lang="en">
Location of the MySQL server binary
</longdesc>
<shortdesc lang="en">MySQL server binary</shortdesc>
<content type="string" default="${OCF_RESKEY_binary_default}" />
</parameter>

<parameter name="client_binary" unique="0" required="0">
<longdesc lang="en">
Location of the MySQL client binary
</longdesc>
<shortdesc lang="en">MySQL client binary</shortdesc>
<content type="string" default="${OCF_RESKEY_client_binary_default}" />
</parameter>

<parameter name="config" unique="0" required="0">
<longdesc lang="en">
Configuration file
</longdesc>
<shortdesc lang="en">MySQL config</shortdesc>
<content type="string" default="${OCF_RESKEY_config_default}" />
</parameter>

<parameter name="datadir" unique="0" required="0">
<longdesc lang="en">
Directory containing databases
</longdesc>
<shortdesc lang="en">MySQL datadir</shortdesc>
<content type="string" default="${OCF_RESKEY_datadir_default}" />
</parameter>

<parameter name="user" unique="0" required="0">
<longdesc lang="en">
User running MySQL daemon
</longdesc>
<shortdesc lang="en">MySQL user</shortdesc>
<content type="string" default="${OCF_RESKEY_user_default}" />
</parameter>

<parameter name="group" unique="0" required="0">
<longdesc lang="en">
Group running MySQL daemon (for logfile and directory permissions)
</longdesc>
<shortdesc lang="en">MySQL group</shortdesc>
<content type="string" default="${OCF_RESKEY_group_default}"/>
</parameter>

<parameter name="log" unique="0" required="0">
<longdesc lang="en">
The logfile to be used for mysqld.
</longdesc>
<shortdesc lang="en">MySQL log file</shortdesc>
<content type="string" default="${OCF_RESKEY_log_default}"/>
</parameter>

<parameter name="pid" unique="0" required="0">
<longdesc lang="en">
The pidfile to be used for mysqld.
</longdesc>
<shortdesc lang="en">MySQL pid file</shortdesc>
<content type="string" default="${OCF_RESKEY_pid_default}"/>
</parameter>

<parameter name="socket" unique="0" required="0">
<longdesc lang="en">
The socket to be used for mysqld.
</longdesc>
<shortdesc lang="en">MySQL socket</shortdesc>
<content type="string" default="${OCF_RESKEY_socket_default}"/>
</parameter>

<parameter name="enable_creation" unique="0" required="0">
<longdesc lang="en">
If the MySQL database does not exist, it will be created
</longdesc>
<shortdesc lang="en">Create the database if it does not exist</shortdesc>
<content type="boolean" default="${OCF_RESKEY_enable_creation_default}"/>
</parameter>

<parameter name="additional_parameters" unique="0" required="0">
<longdesc lang="en">
Additional parameters which are passed to the mysqld on startup.
(e.g. --skip-external-locking or --skip-grant-tables)
</longdesc>
<shortdesc lang="en">Additional parameters to pass to mysqld</shortdesc>
<content type="string" default="${OCF_RESKEY_additional_parameters_default}"/>
</parameter>


<parameter name="wsrep_cluster_address" unique="0" required="1">
<longdesc lang="en">
The galera cluster address. This takes the form of:
gcomm://node,node,node

Only nodes present in this node list will be allowed to start a galera instance.
It is expected that the galera node names listed in this address match valid
pacemaker node names.
</longdesc>
<shortdesc lang="en">Galera cluster address</shortdesc>
<content type="string" default=""/>
</parameter>

<parameter name="check_user" unique="0" required="0">
<longdesc lang="en">
Cluster check user.
</longdesc>
<shortdesc lang="en">MySQL test user</shortdesc>
<content type="string" default="root" />
</parameter>

<parameter name="check_passwd" unique="0" required="0">
<longdesc lang="en">
Cluster check user password
</longdesc>
<shortdesc lang="en">check password</shortdesc>
<content type="string" default="" />
</parameter>

</parameters>

<actions>
<action name="start" timeout="120" />
<action name="stop" timeout="120" />
<action name="status" timeout="60" />
<action name="monitor" depth="0" timeout="30" interval="20" />
<action name="monitor" role="Master" depth="0" timeout="30" interval="10" />
<action name="monitor" role="Slave" depth="0" timeout="30" interval="30" />
<action name="promote" timeout="300" />
<action name="demote" timeout="120" />
<action name="validate-all" timeout="5" />
<action name="meta-data" timeout="5" />
</actions>
</resource-agent>
END
}

get_option_variable()
{
    local key=$1

    $MYSQL $MYSQL_OPTIONS_CHECK  -e "SHOW VARIABLES like '$key';" | tail -1
}

get_status_variable()
{
    local key=$1

    $MYSQL $MYSQL_OPTIONS_CHECK -e "show status like '$key';" | tail -1
}

set_bootstrap_node()
{
    local node=$1

    ${HA_SBIN_DIR}/crm_attribute -N $node -l reboot --name "${INSTANCE_ATTR_NAME}-bootstrap" -v "true"
}

clear_bootstrap_node()
{
    ${HA_SBIN_DIR}/crm_attribute -N $NODENAME -l reboot --name "${INSTANCE_ATTR_NAME}-bootstrap" -D
}

is_bootstrap()
{
    ${HA_SBIN_DIR}/crm_attribute -N $NODENAME -l reboot --name "${INSTANCE_ATTR_NAME}-bootstrap" -Q 2>/dev/null

}

set_no_grastate()
{
    ${HA_SBIN_DIR}/crm_attribute -N $NODENAME -l reboot --name "${INSTANCE_ATTR_NAME}-no-grastate" -v "true"
}

clear_no_grastate()
{
    ${HA_SBIN_DIR}/crm_attribute -N $NODENAME -l reboot --name "${INSTANCE_ATTR_NAME}-no-grastate" -D
}

is_no_grastate()
{
    local node=$1
    ${HA_SBIN_DIR}/crm_attribute -N $node -l reboot --name "${INSTANCE_ATTR_NAME}-no-grastate" -Q 2>/dev/null
}

clear_last_commit()
{
    ${HA_SBIN_DIR}/crm_attribute -N $NODENAME -l reboot --name "${INSTANCE_ATTR_NAME}-last-committed" -D
}

set_last_commit()
{
    ${HA_SBIN_DIR}/crm_attribute -N $NODENAME -l reboot --name "${INSTANCE_ATTR_NAME}-last-committed" -v $1
}

get_last_commit()
{
    local node=$1

    if [ -z "$node" ]; then
       ${HA_SBIN_DIR}/crm_attribute -N $NODENAME -l reboot --name "${INSTANCE_ATTR_NAME}-last-committed" -Q 2>/dev/null
    else 
       ${HA_SBIN_DIR}/crm_attribute -N $node -l reboot --name "${INSTANCE_ATTR_NAME}-last-committed" -Q 2>/dev/null
    fi
}

wait_for_sync()
{
    local state=$(get_status_variable "wsrep_local_state")

    ocf_log info "Waiting for database to sync with the cluster. "
    while [ "$state" != "4" ]; do
        sleep 1
        state=$(get_status_variable "wsrep_local_state")
    done
    ocf_log info "Database synced."
}

set_sync_needed()
{
    ${HA_SBIN_DIR}/crm_attribute -N $NODENAME -l reboot --name "${INSTANCE_ATTR_NAME}-sync-needed" -v "true"
}

clear_sync_needed()
{
    ${HA_SBIN_DIR}/crm_attribute -N $NODENAME -l reboot --name "${INSTANCE_ATTR_NAME}-sync-needed" -D
}

check_sync_needed()
{
    ${HA_SBIN_DIR}/crm_attribute -N $NODENAME -l reboot --name "${INSTANCE_ATTR_NAME}-sync-needed" -Q 2>/dev/null
}


# this function is called when attribute sync-needed is set in the CIB
check_sync_status()
{
    # if the pidfile is created, mysqld is up and running
    # an IST might still be in progress, check wsrep status
    if [ -e $OCF_RESKEY_pid ]; then
        local cluster_status=$(get_status_variable "wsrep_cluster_status")
        local state=$(get_status_variable "wsrep_local_state")
        local ready=$(get_status_variable "wsrep_ready")

        if [ -z "$cluster_status" -o -z "$state" -o -z "$ready" ]; then
            ocf_exit_reason "Unable to retrieve state transfer status, verify check_user '$OCF_RESKEY_check_user' has permissions to view status"
            return $OCF_ERR_GENERIC
        fi

        if [ "$cluster_status" != "Primary" ]; then
            ocf_exit_reason "local node <${NODENAME}> is started, but not in primary mode. Unknown state."
            return $OCF_ERR_GENERIC
        fi

        if [ "$state" = "4" -a "$ready" = "ON" ]; then
            ocf_log info "local node synced with the cluster"
            # when sync is finished, we are ready to switch to Master
            clear_sync_needed
            set_master_score
            return $OCF_SUCCESS
        fi
    fi

    # if we pass here, an IST or SST is still in progress
    ocf_log info "local node syncing"
    return $OCF_SUCCESS
}

is_primary()
{
    cluster_status=$(get_status_variable "wsrep_cluster_status")
    if [ "$cluster_status" = "Primary" ]; then
        return 0
    fi

    if [ -z "$cluster_status" ]; then
        ocf_exit_reason "Unable to retrieve wsrep_cluster_status, verify check_user '$OCF_RESKEY_check_user' has permissions to view status"
    else
        ocf_log info "Galera instance wsrep_cluster_status=${cluster_status}"
    fi
    return 1
}

is_readonly()
{
    local res=$(get_option_variable "read_only")

    if ! ocf_is_true "$res"; then
        return 1
    fi

    cluster_status=$(get_status_variable "wsrep_cluster_status")
    if ! [ "$cluster_status" = "Disconnected" ]; then
        return 1
    fi

    return 0
}

master_exists()
{
    if [ "$__OCF_ACTION" = "demote" ]; then
        # We don't want to detect master instances during demote.
        # 1. we could be detecting ourselves as being master, which is no longer the case.
        # 2. we could be detecting other master instances that are in the process of shutting down.
        # by not detecting other master instances in "demote" we are deferring this check
        # to the next recurring monitor operation which will be much more accurate
        return 1
    fi
    # determine if a master instance is already up and is healthy
    crm_mon --as-xml | grep "resource.*id=\"${OCF_RESOURCE_INSTANCE}\".*role=\"Master\".*active=\"true\".*orphaned=\"false\".*failed=\"false\"" > /dev/null 2>&1
    return $?
}

clear_master_score()
{
    local node=$1
    if [ -z "$node" ]; then
        $CRM_MASTER -D
    else 
        $CRM_MASTER -D -N $node
    fi
}

set_master_score()
{
    local node=$1

    if [ -z "$node" ]; then
        $CRM_MASTER -v 100
    else 
        $CRM_MASTER -N $node -v 100
    fi
}

greater_than_equal_long()
{
    # there are values we need to compare in this script
    # that are too large for shell -gt to process
    echo | awk -v n1="$1" -v n2="$2"  '{if (n1>=n2) printf ("true"); else printf ("false");}' |  grep -q "true"
}

detect_first_master()
{
    local best_commit=0
    local best_node="$NODENAME"
    local last_commit=0
    local missing_nodes=0
    local nodes=""
    local nodes_recovered=""

    # avoid selecting a recovered node as bootstrap if possible
    for node in $(echo "$OCF_RESKEY_wsrep_cluster_address" | sed 's/gcomm:\/\///g' | tr -d ' ' | tr -s ',' ' '); do
        if is_no_grastate $node; then
            nodes_recovered="$nodes_recovered $node"
        else
            nodes="$nodes $node"
        fi
    done

    for node in $nodes_recovered $nodes; do
        last_commit=$(get_last_commit $node)

        if [ -z "$last_commit" ]; then
            ocf_log info "Waiting on node <${node}> to report database status before Master instances can start."
            missing_nodes=1
            continue
        fi

        # this means -1, or that no commit has occured yet.
        if [ "$last_commit" = "18446744073709551615" ]; then
            last_commit="0"
        fi

        greater_than_equal_long "$last_commit" "$best_commit"
        if [ $? -eq 0 ]; then
            best_node=$node
            best_commit=$last_commit
        fi

    done

    if [ $missing_nodes -eq 1 ]; then
        return
    fi

    ocf_log info "Promoting $best_node to be our bootstrap node"
    set_master_score $best_node
    set_bootstrap_node $best_node
}

detect_galera_pid()
{
    ps auxww | grep -v -e "${OCF_RESKEY_binary}" -e grep | grep -qe "--pid-file=$OCF_RESKEY_pid"
}

galera_status()
{
    local loglevel=$1
    local rc
    local running

    if [ -e $OCF_RESKEY_pid ]; then
        mysql_common_status $loglevel
        rc=$?
    else
        # if pidfile is not created, the server may
        # still be starting up, e.g. running SST
        detect_galera_pid
        running=$?
        if [ $running -eq 0 ]; then
            rc=$OCF_SUCCESS
        else
            ocf_log $loglevel "MySQL is not running"
            rc=$OCF_NOT_RUNNING
        fi
    fi

    return $rc
}

galera_start_nowait()
{
    local mysql_extra_params="$1"
    local pid
    local running

    ${OCF_RESKEY_binary} --defaults-file=$OCF_RESKEY_config \
    --pid-file=$OCF_RESKEY_pid \
    --socket=$OCF_RESKEY_socket \
    --datadir=$OCF_RESKEY_datadir \
    --log-error=$OCF_RESKEY_log \
    --user=$OCF_RESKEY_user $OCF_RESKEY_additional_parameters \
    $mysql_extra_params >/dev/null 2>&1 &
    pid=$!

    # Spin waiting for the server to be spawned.
    # Let the CRM/LRM time us out if required.
    start_wait=1
    while [ $start_wait = 1 ]; do
        if ! ps $pid > /dev/null 2>&1; then
            wait $pid
            ocf_exit_reason "MySQL server failed to start (pid=$pid) (rc=$?), please check your installation"
            return $OCF_ERR_GENERIC
        fi
        detect_galera_pid
        running=$?
        if [ $running -eq 0 ]; then
            start_wait=0
        else
            ocf_log info "MySQL is not running"
        fi
        sleep 2
    done

    return $OCF_SUCCESS
}

galera_start_local_node()
{
    local rc
    local extra_opts
    local bootstrap

    bootstrap=$(is_bootstrap)
    
    master_exists
    if [ $? -eq 0 ]; then
        # join without bootstrapping
        ocf_log info "Node <${NODENAME}> is joining the cluster"
        extra_opts="--wsrep-cluster-address=${OCF_RESKEY_wsrep_cluster_address}"
    elif ocf_is_true $bootstrap; then
        ocf_log info "Node <${NODENAME}> is bootstrapping the cluster"
        extra_opts="--wsrep-cluster-address=gcomm://"
    else
        ocf_exit_reason "Failure, Attempted to join cluster of $OCF_RESOURCE_INSTANCE before master node has been detected."
        clear_last_commit
        return $OCF_ERR_GENERIC
    fi

    # clear last_commit before we start galera to make sure there
    # won't be discrepency between the cib and galera if this node
    # processes a few transactions and fails before we detect it
    clear_last_commit

    mysql_common_prepare_dirs

    # At start time, if galera requires a SST rather than an IST, the
    # mysql server's pidfile won't be available until SST finishes,
    # which can be longer than the start timeout.  So we only check
    # bootstrap node extensively. Joiner nodes are monitored in the
    # "monitor" op
    if ocf_is_true $bootstrap; then
        # start server and wait until it's up and running
        mysql_common_start "$extra_opts"
        rc=$?
        if [ $rc != $OCF_SUCCESS ]; then
            return $rc
        fi

        mysql_common_status info
        rc=$?

        if [ $rc != $OCF_SUCCESS ]; then
            ocf_exit_reason "Failed initial monitor action"
            return $rc
        fi

        is_readonly
        if [ $? -eq 0 ]; then
            ocf_exit_reason "Failure. Master instance started in read-only mode, check configuration."
            return $OCF_ERR_GENERIC
        fi

        is_primary
        if [ $? -ne 0 ]; then
            ocf_exit_reason "Failure. Master instance started, but is not in Primary mode."
            return $OCF_ERR_GENERIC
        fi

        clear_bootstrap_node
        # clear attribute no-grastate. if last shutdown was
        # not clean, we cannot be extra-cautious by requesting a SST
        # since this is the bootstrap node
        clear_no_grastate
    else
        # only start server, defer full checks to "monitor" op
        galera_start_nowait "$extra_opts"
        rc=$?
        if [ $rc != $OCF_SUCCESS ]; then
            return $rc
        fi

        set_sync_needed
        # attribute no-grastate will be cleared once the joiner
        # has finished syncing and is promoted to Master
    fi

    ocf_log info "Galera started"
    return $OCF_SUCCESS
}

detect_last_commit()
{
    local last_commit
    local recover_args="--defaults-file=$OCF_RESKEY_config \
                        --pid-file=$OCF_RESKEY_pid \
                        --socket=$OCF_RESKEY_socket \
                        --datadir=$OCF_RESKEY_datadir \
                        --user=$OCF_RESKEY_user"
    local recovery_file_regex='s/.*WSREP\:.*position\s*recovery.*--log_error='\''\([^'\'']*\)'\''.*/\1/p'
    local recovered_position_regex='s/.*WSREP\:\s*[R|r]ecovered\s*position.*\:\(.*\)\s*$/\1/p'

    ocf_log info "attempting to detect last commit version by reading ${OCF_RESKEY_datadir}/grastate.dat"
    last_commit="$(cat ${OCF_RESKEY_datadir}/grastate.dat | sed -n 's/^seqno.\s*\(.*\)\s*$/\1/p')"
    if [ -z "$last_commit" ] || [ "$last_commit" = "-1" ]; then
        local tmp=$(mktemp)

        # if we pass here because grastate.dat doesn't exist,
        # try not to bootstrap from this node if possible
        if [ ! -f ${OCF_RESKEY_datadir}/grastate.dat ]; then
            set_no_grastate
        fi

        ocf_log info "now attempting to detect last commit version using 'mysqld_safe --wsrep-recover'"

        ${OCF_RESKEY_binary} $recover_args --wsrep-recover --log-error=$tmp 2>/dev/null

        last_commit="$(cat $tmp | sed -n $recovered_position_regex | tail -1)"
        if [ -z "$last_commit" ]; then
            # Galera uses InnoDB's 2pc transactions internally. If
            # server was stopped in the middle of a replication, the
            # recovery may find a "prepared" XA transaction in the
            # redo log, and mysql won't recover automatically

            local recovery_file="$(cat $tmp | sed -n $recovery_file_regex)"
            if [ -e $recovery_file ]; then
                cat $recovery_file | grep -q -E '\[ERROR\]\s+Found\s+[0-9]+\s+prepared\s+transactions!' 2>/dev/null
                if [ $? -eq 0 ]; then
                    # we can only rollback the transaction, but that's OK
                    # since the DB will get resynchronized anyway
                    ocf_log warn "local node <${NODENAME}> was not shutdown properly. Rollback stuck transaction with --tc-heuristic-recover"
                    ${OCF_RESKEY_binary} $recover_args --wsrep-recover \
                                         --tc-heuristic-recover=rollback --log-error=$tmp 2>/dev/null

                    last_commit="$(cat $tmp | sed -n $recovered_position_regex | tail -1)"
                    if [ ! -z "$last_commit" ]; then
                        ocf_log warn "State recovered. force SST at next restart for full resynchronization"
                        rm -f ${OCF_RESKEY_datadir}/grastate.dat
                        # try not to bootstrap from this node if possible
                        set_no_grastate
                    fi
                fi
            fi
        fi
        rm -f $tmp
    fi

    if [ ! -z "$last_commit" ]; then
        ocf_log info "Last commit version found:  $last_commit"
        set_last_commit $last_commit
        return $OCF_SUCCESS
    else
        ocf_exit_reason "Unable to detect last known write sequence number"
        clear_last_commit
        return $OCF_ERR_GENERIC
    fi
}

galera_promote()
{
    local rc
    local extra_opts
    local bootstrap

    master_exists
    if [ $? -ne 0 ]; then
        # promoting the first master will bootstrap the cluster
        if is_bootstrap; then
            galera_start_local_node
            rc=$?
            return $rc
        else
            ocf_exit_reason "Attempted to start the cluster without being a bootstrap node."
            return $OCF_ERR_GENERIC
        fi
    else
        # promoting other masters only performs sanity checks
        # as the joining nodes were started during the "monitor" op
        if ! check_sync_needed; then
            # sync is done, clear info about last startup
            clear_no_grastate
            return $OCF_SUCCESS
        else
            ocf_exit_reason "Attempted to promote local node while sync was still needed."
            return $OCF_ERR_GENERIC
        fi
    fi
}

galera_demote()
{
    mysql_common_stop
    rc=$?
    if [ $rc -ne $OCF_SUCCESS ] && [ $rc -ne $OCF_NOT_RUNNING ]; then
        ocf_exit_reason "Failed to stop Master galera instance during demotion to Master"
        return $rc
    fi

    # if this node was previously a bootstrap node, that is no longer the case.
    clear_bootstrap_node
    clear_last_commit
    clear_sync_needed
    clear_no_grastate

    # Clear master score here rather than letting pacemaker do so once
    # demote finishes. This way a promote cannot take place right
    # after this demote even if pacemaker is requested to do so. It
    # will first have to run a start/monitor op, to reprobe the state
    # of the other galera nodes and act accordingly.
    clear_master_score

    # record last commit for next promotion
    detect_last_commit
    rc=$?
    return $rc
}

galera_start()
{
    local rc

    echo $OCF_RESKEY_wsrep_cluster_address | grep -q $NODENAME
    if [ $? -ne 0 ]; then
        ocf_exit_reason "local node <${NODENAME}> must be a member of the wsrep_cluster_address <${OCF_RESKEY_wsrep_cluster_address}>to start this galera instance"
        return $OCF_ERR_CONFIGURED
    fi

    galera_status info
    if [ $? -ne $OCF_NOT_RUNNING ]; then
        ocf_exit_reason "master galera instance started outside of the cluster's control"
        return $OCF_ERR_GENERIC
    fi

    mysql_common_prepare_dirs

    detect_last_commit
    rc=$?
    if [ $rc -ne $OCF_SUCCESS ]; then
        return $rc
    fi

    master_exists
    if [ $? -eq 0 ]; then
        ocf_log info "Master instances are already up, local node will join in when started"
    else
        clear_master_score
        detect_first_master
    fi

    return $OCF_SUCCESS
}

galera_monitor()
{
    local rc
    local status_loglevel="err"

    # Set loglevel to info during probe
    if ocf_is_probe; then
        status_loglevel="info"
    fi

    # Check whether mysql is running or about to start after sync
    galera_status $status_loglevel
    rc=$?

    if [ $rc -eq $OCF_NOT_RUNNING ]; then
        last_commit=$(get_last_commit $NODENAME)
        if [ -n "$last_commit" ];then
            rc=$OCF_SUCCESS

            if ocf_is_probe; then
                # prevent state change during probe
                return $rc
            fi

            master_exists
            if [ $? -ne 0 ]; then
                detect_first_master
            else
                # a master instance exists and is healthy.
                # start this node and mark it as "pending sync"
                ocf_log info "cluster is running. start local node to join in"
                galera_start_local_node
                rc=$?
            fi
        fi
        return $rc
    elif [ $rc -ne $OCF_SUCCESS ]; then
        return $rc
    fi

    # if we make it here, mysql is running or about to start after sync.
    # Check cluster status now.

    echo $OCF_RESKEY_wsrep_cluster_address | grep -q $NODENAME
    if [ $? -ne 0 ]; then
        ocf_exit_reason "local node <${NODENAME}> is started, but is not a member of the wsrep_cluster_address <${OCF_RESKEY_wsrep_cluster_address}>"
        return $OCF_ERR_GENERIC
    fi

    check_sync_needed
    if [ $? -eq 0 ]; then
        # galera running and sync is needed: slave state
        if ocf_is_probe; then
            # prevent state change during probe
            rc=$OCF_SUCCESS
        else
            check_sync_status
            rc=$?
        fi
    else
        is_primary
        if [ $? -ne 0 ]; then
            ocf_exit_reason "local node <${NODENAME}> is started, but not in primary mode. Unknown state."
            rc=$OCF_ERR_GENERIC
        else
            # galera running, no need to sync: master state and everything's clear
            rc=$OCF_RUNNING_MASTER

            if ocf_is_probe; then
                # restore master score during probe
                # if we detect this is a master instance
                set_master_score
            fi
        fi
    fi

    return $rc
}

galera_stop()
{
    local rc
    # make sure the process is stopped
    mysql_common_stop
    rc=$?

    clear_last_commit
    clear_master_score
    clear_bootstrap_node
    clear_sync_needed
    clear_no_grastate
    return $rc
}

galera_validate()
{
    if ! ocf_is_ms; then
        ocf_exit_reason "Galera must be configured as a multistate Master/Slave resource."
        return $OCF_ERR_CONFIGURED
    fi

    if [ -z "$OCF_RESKEY_wsrep_cluster_address" ]; then
        ocf_exit_reason "Galera must be configured with a wsrep_cluster_address value."
        return $OCF_ERR_CONFIGURED
    fi

    mysql_common_validate
}

case "$1" in
  meta-data)    meta_data
        exit $OCF_SUCCESS;;
  usage|help)   usage
        exit $OCF_SUCCESS;;
esac

galera_validate
rc=$?
LSB_STATUS_STOPPED=3
if [ $rc -ne 0 ]; then
    case "$1" in
        stop) exit $OCF_SUCCESS;;
        monitor) exit $OCF_NOT_RUNNING;;
        status) exit $LSB_STATUS_STOPPED;;
        *) exit $rc;;
    esac
fi

if [ -z "${OCF_RESKEY_check_passwd}" ]; then
    # This value is automatically sourced from /etc/sysconfig/checkcluster if available
    OCF_RESKEY_check_passwd=${MYSQL_PASSWORD}
fi
if [ -z "${OCF_RESKEY_check_user}" ]; then
    # This value is automatically sourced from /etc/sysconfig/checkcluster if available
    OCF_RESKEY_check_user=${MYSQL_USERNAME}
fi
: ${OCF_RESKEY_check_user="root"}

MYSQL_OPTIONS_CHECK="-nNE --user=${OCF_RESKEY_check_user}"
if [ -n "${OCF_RESKEY_check_passwd}" ]; then
    MYSQL_OPTIONS_CHECK="$MYSQL_OPTIONS_CHECK --password=${OCF_RESKEY_check_passwd}"
fi

# This value is automatically sourced from /etc/sysconfig/checkcluster if available
if [ -n "${MYSQL_HOST}" ]; then
    MYSQL_OPTIONS_CHECK="$MYSQL_OPTIONS_CHECK -h ${MYSQL_HOST}"
fi

# This value is automatically sourced from /etc/sysconfig/checkcluster if available
if [ -n "${MYSQL_PORT}" ]; then
    MYSQL_OPTIONS_CHECK="$MYSQL_OPTIONS_CHECK -P ${MYSQL_PORT}"
fi



# What kind of method was invoked?
case "$1" in
  start)    galera_start;;
  stop)     galera_stop;;
  status)   galera_status err;;
  monitor)  galera_monitor;;
  promote)  galera_promote;;
  demote)   galera_demote;;
  validate-all) exit $OCF_SUCCESS;;

 *)     usage
        exit $OCF_ERR_UNIMPLEMENTED;;
esac

# vi:sw=4:ts=4:et: