- pacemaker-1.0.12-1
- corosync-1.2.7-1.1
Vou configurar o failover para a replicação do MySQL (1 mestre e 1 escravo)
siga este guia:
link
Aqui está a saída de crm configure show
:
node serving-6192 \
attributes p_mysql_mysql_master_IP="192.168.6.192"
node svr184R-638.localdomain \
attributes p_mysql_mysql_master_IP="192.168.6.38"
primitive p_mysql ocf:percona:mysql \
params config="/etc/my.cnf" pid="/var/run/mysqld/mysqld.pid"
socket="/var/lib/mysql/mysql.sock" replication_user="repl"
replication_passwd="x" test_user="test_user" test_passwd="x" \
op monitor interval="5s" role="Master" OCF_CHECK_LEVEL="1" \
op monitor interval="2s" role="Slave" timeout="30s"
OCF_CHECK_LEVEL="1" \
op start interval="0" timeout="120s" \
op stop interval="0" timeout="120s"
primitive writer_vip ocf:heartbeat:IPaddr2 \
params ip="192.168.6.8" cidr_netmask="32" \
op monitor interval="10s" \
meta is-managed="true"
ms ms_MySQL p_mysql \
meta master-max="1" master-node-max="1" clone-max="2"
clone-node-max="1" notify="true" globally-unique="false"
target-role="Master" is-managed="true"
colocation writer_vip_on_master inf: writer_vip ms_MySQL:Master
order ms_MySQL_promote_before_vip inf: ms_MySQL:promote writer_vip:start
property $id="cib-bootstrap-options" \
dc-version="1.0.12-unknown" \
cluster-infrastructure="openais" \
expected-quorum-votes="2" \
no-quorum-policy="ignore" \
stonith-enabled="false" \
last-lrm-refresh="1341801689"
property $id="mysql_replication" \
p_mysql_REPL_INFO="192.168.6.192|mysql-bin.000006|338"
crm_mon
:
Last updated: Mon Jul 9 10:30:01 2012
Stack: openais
Current DC: serving-6192 - partition with quorum
Version: 1.0.12-unknown
2 Nodes configured, 2 expected votes
2 Resources configured.
============
Online: [ serving-6192 svr184R-638.localdomain ]
Master/Slave Set: ms_MySQL
Masters: [ serving-6192 ]
Slaves: [ svr184R-638.localdomain ]
writer_vip (ocf::heartbeat:IPaddr2): Started serving-6192
Editando /etc/my.cnf
na servindo-6192 da sintaxe errada para testar
failover e está funcionando bem:
- svr184R-638.localdomain sendo promovido para se tornar o mestre
- writer_vip muda para svr184R-638.localdomain
Estado atual:
Last updated: Mon Jul 9 10:35:57 2012
Stack: openais
Current DC: serving-6192 - partition with quorum
Version: 1.0.12-unknown
2 Nodes configured, 2 expected votes
2 Resources configured.
============
Online: [ serving-6192 svr184R-638.localdomain ]
Master/Slave Set: ms_MySQL
Masters: [ svr184R-638.localdomain ]
Stopped: [ p_mysql:0 ]
writer_vip (ocf::heartbeat:IPaddr2): Started svr184R-638.localdomain
Failed actions:
p_mysql:0_monitor_5000 (node=serving-6192, call=15, rc=7,
status=complete): not running
p_mysql:0_demote_0 (node=serving-6192, call=22, rc=7,
status=complete): not running
p_mysql:0_start_0 (node=serving-6192, call=26, rc=-2, status=Timed
Out): unknown exec error
Remova a sintaxe errada de /etc/my.cnf
em serving-6192 e reinicie
corosync
, o que eu gostaria de ver é o servindo-6192 sendo iniciado como um novo
escravo, mas isso não acontece:
Failed actions:
p_mysql:0_start_0 (node=serving-6192, call=4, rc=1,
status=complete): unknown error
Aqui está o snippet dos logs que estou suspeitando:
Jul 09 10:46:32 serving-6192 lrmd: [7321]: info: rsc:p_mysql:0:4: start
Jul 09 10:46:32 serving-6192 lrmd: [7321]: info: RA output:
(p_mysql:0:start:stderr) Error performing operation: The
object/attribute does not exist
Jul 09 10:46:32 serving-6192 crm_attribute: [7420]: info: Invoked:
/usr/sbin/crm_attribute -N serving-6192 -l reboot --name readable -v 0
/var/log/cluster/corosync.log
: link
O mais estranho é que posso começar manualmente:
export OCF_ROOT=/usr/lib/ocf
export OCF_RESKEY_config="/etc/my.cnf"
export OCF_RESKEY_pid="/var/run/mysqld/mysqld.pid"
export OCF_RESKEY_socket="/var/lib/mysql/mysql.sock"
export OCF_RESKEY_replication_user="repl"
export OCF_RESKEY_replication_passwd="x"
export OCF_RESKEY_test_user="test_user"
export OCF_RESKEY_test_passwd="x"
sh -x /usr/lib/ocf/resource.d/percona/mysql start
: link
Eu fiz algo errado?
Responder a @Patrick Fri 13 de julho 10:22:10 ICT 2012:
I'm not sure why its failing as your log doesnt contain any messages
from the resource script (the ocf_log commands)
Eu pego tudo de /var/log/cluster/corosync.log
. Você tem algum motivo em mente?
/etc/corosync/corosync.conf
compatibility: whitetank
totem {
version: 2
secauth: off
threads: 0
interface {
member {
memberaddr: 192.168.6.192
}
member {
memberaddr: 192.168.6.38
}
ringnumber: 0
bindnetaddr: 192.168.6.0
mcastaddr: 226.94.1.1
mcastport: 5405
}
}
logging {
fileline: off
to_stderr: yes
to_logfile: yes
to_syslog: yes
logfile: /var/log/cluster/corosync.log
debug: on
timestamp: on
logger_subsys {
subsys: AMF
debug: off
}
}
amf {
mode: disabled
}
Also the reason the script works when you run it manually is because
you're not setting the variables which tells the script its a
master/slave resource. So when it runs, the script thinks its just a
single standalone instance.
Obrigado. Eu adicionei as seguintes variáveis ao meu ~/.bash_profile
:
export OCF_RESKEY_CRM_meta_clone_max="2"
export OCF_RESKEY_CRM_meta_role="Slave"
Faça com que ele tenha efeito . ~/.bash_profile
e inicie manualmente o recurso mysql:
sh -x /usr/lib/ocf/resource.d/percona/mysql start
: link
e funciona bem:
mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.6.38
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000072
Read_Master_Log_Pos: 1428602
Relay_Log_File: mysqld-relay-bin.000006
Relay_Log_Pos: 39370
Relay_Master_Log_File: mysql-bin.000072
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 1428602
Relay_Log_Space: 39527
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 123
1 row in set (0.00 sec)
Pare o MySQL, ative a depuração, reinicie o corosync e veja os registros: link
Como você pode ver, nada além de "erro desconhecido":
1.
Jul 13 10:48:06 serving-6192 crmd: [3341]: debug:
get_xpath_object: No match for
//cib_update_result//diff-added//crm_config in
/notify/cib_update_result/diff
2.
Jul 13 10:48:06 serving-6192 lrmd: [3338]: WARN: Managed
p_mysql:1:start process 3416 exited with return code 1.
3.
Jul 13 10:48:06 serving-6192 crmd: [3341]: info:
process_lrm_event: LRM operation p_mysql:1_start_0 (call=4,
rc=1, cib-update=10, confirmed=true) unknown error
Alguma opinião?
ATUALIZAÇÃO Sáb Jul 14 17:16:03 ICT 2012:
@Patrick: obrigado por suas dicas!
As variáveis de ambiente usadas pelo Pacemaker são as seguintes: link
Como eu suspeitava ao conversar com você, o nó serving-6192
foi iniciado com OCF_RESKEY_CRM_meta_master_max=1
, portanto, devido ao seguinte código:
/usr/lib/ocf/resource.d/percona/mysql:
if ocf_is_ms; then
mysql_extra_params="--skip-slave-start"
fi
/usr/lib/ocf//lib/heartbeat/ocf-shellfuncs:
ocf_is_ms() {
[ ! -z "${OCF_RESKEY_CRM_meta_master_max}" ] && [ "${OCF_RESKEY_CRM_meta_master_max}" -gt 0 ]
}
o parâmetro extra --skip-slave-start
está incluído:
ps -ef | grep mysql
root 18215 1 0 17:12 pts/4 00:00:00 /bin/sh /usr/bin/mysqld_safe --defaults-file=/etc/my.cnf --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock --datadir=/var/lib/mysql --user=mysql --skip-slave-start
mysql 19025 18215 1 17:12 pts/4 00:00:14 /usr/libexec/mysqld --defaults-file=/etc/my.cnf --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --skip-slave-start --log-error=/var/log/mysqld.log --open-files-limit=8192 --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock --port=3306
mas o segmento SQL ainda está em execução:
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
e a replicação está funcionando bem.
IFS=$'\n' ENV=( $(cat /tmp/16374.env) ); env -i - "${ENV[@]}" sh -x /usr/lib/ocf/resource.d/percona/mysql start
: link
Estou batendo com a cabeça contra a parede (: - > |