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master:192.168.8.57
slave1:192.168.8.58
slave2:192.168.8.59
manager:192.168.8.60
MHA工具包:
mha4MySQL-manager-0.58.tar.gz
mha4mysql-node-0.58.tar.gz
keepalived-1.4.5.tar.gz
一、环境配置过程如下:
http://blog.itpub.net/30135314/viewspace-2217762/
二、切换测试
1.在192.168.8.57关闭MySQL进程
1 |
mysqladmin -uroot -pmysql
shutdown
|
2.查看MHA manager日志
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 |
Mon Oct 29 13:55:18 2018 - [warning] Got error on MySQL
select
ping
: 2006 (MySQL server has gone away)
Mon Oct 29 13:55:18 2018 - [info] Executing secondary network check script:
/usr/local/bin/masterha_secondary_check
-s 192.168.8.58 -s 192.168.8.59 --user=root --master_host=192.168.8.57 --master_ip=192.168.8.57 --master_port=3306 --master_user=root --master_password=mysql --ping_type=SELECT
Mon Oct 29 13:55:18 2018 - [info] Executing SSH check script:
exit
Mon Oct 29 13:55:18 2018 - [info] HealthCheck: SSH to 192.168.8.57 is reachable.
Monitoring server 192.168.8.58 is reachable, Master is not reachable from 192.168.8.58. OK.
Mon Oct 29 13:55:19 2018 - [warning] Got error on MySQL connect: 2003 (Can
't connect to MySQL server on '
192.168.8.57' (111))
Mon Oct 29 13:55:19 2018 - [warning] Connection failed 2
time
(s)..
Monitoring server 192.168.8.59 is reachable, Master is not reachable from 192.168.8.59. OK.
Mon Oct 29 13:55:19 2018 - [info] Master is not reachable from all other monitoring servers. Failover should start.
Mon Oct 29 13:55:20 2018 - [warning] Got error on MySQL connect: 2003 (Can
't connect to MySQL server on '
192.168.8.57' (111))
Mon Oct 29 13:55:20 2018 - [warning] Connection failed 3
time
(s)..
Mon Oct 29 13:55:21 2018 - [warning] Got error on MySQL connect: 2003 (Can
't connect to MySQL server on '
192.168.8.57' (111))
Mon Oct 29 13:55:21 2018 - [warning] Connection failed 4
time
(s)..
Mon Oct 29 13:55:21 2018 - [warning] Master is not reachable from health checker!
Mon Oct 29 13:55:21 2018 - [warning] Master 192.168.8.57(192.168.8.57:3306) is not reachable!
Mon Oct 29 13:55:21 2018 - [warning] SSH is reachable.
Mon Oct 29 13:55:21 2018 - [info] Connecting to a master server failed. Reading configuration
file
/etc/masterha_default
.cnf and
/etc/masterha/app1
.cnf again, and trying to connect to all servers to check server status..
Mon Oct 29 13:55:21 2018 - [warning] Global configuration
file
/etc/masterha_default
.cnf not found. Skipping.
Mon Oct 29 13:55:21 2018 - [info] Reading application default configuration from
/etc/masterha/app1
.cnf..
Mon Oct 29 13:55:21 2018 - [info] Reading server configuration from
/etc/masterha/app1
.cnf..
Mon Oct 29 13:55:22 2018 - [info] GTID failover mode = 1
Mon Oct 29 13:55:22 2018 - [info] Dead Servers:
Mon Oct 29 13:55:22 2018 - [info] 192.168.8.57(192.168.8.57:3306)
Mon Oct 29 13:55:22 2018 - [info] Alive Servers:
Mon Oct 29 13:55:22 2018 - [info] 192.168.8.58(192.168.8.58:3306)
Mon Oct 29 13:55:22 2018 - [info] 192.168.8.59(192.168.8.59:3306)
Mon Oct 29 13:55:22 2018 - [info] Alive Slaves:
Mon Oct 29 13:55:22 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled
Mon Oct 29 13:55:22 2018 - [info] GTID ON
Mon Oct 29 13:55:22 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306)
Mon Oct 29 13:55:22 2018 - [info] Primary candidate
for
the new Master (candidate_master is
set
)
Mon Oct 29 13:55:22 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled
Mon Oct 29 13:55:22 2018 - [info] GTID ON
Mon Oct 29 13:55:22 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306)
Mon Oct 29 13:55:22 2018 - [info] Checking slave configurations..
Mon Oct 29 13:55:22 2018 - [info] read_only=1 is not
set
on slave 192.168.8.58(192.168.8.58:3306).
Mon Oct 29 13:55:22 2018 - [info] read_only=1 is not
set
on slave 192.168.8.59(192.168.8.59:3306).
Mon Oct 29 13:55:22 2018 - [info] Checking replication filtering settings..
Mon Oct 29 13:55:22 2018 - [info] Replication filtering check ok.
Mon Oct 29 13:55:22 2018 - [info] Master is down!
Mon Oct 29 13:55:22 2018 - [info] Terminating monitoring script.
Mon Oct 29 13:55:22 2018 - [info] Got
exit
code 20 (Master dead).
Mon Oct 29 13:55:22 2018 - [info] MHA::MasterFailover version 0.58.
Mon Oct 29 13:55:22 2018 - [info] Starting master failover.
Mon Oct 29 13:55:22 2018 - [info]
Mon Oct 29 13:55:22 2018 - [info] * Phase 1: Configuration Check Phase..
Mon Oct 29 13:55:22 2018 - [info]
Mon Oct 29 13:55:23 2018 - [info] GTID failover mode = 1
Mon Oct 29 13:55:23 2018 - [info] Dead Servers:
Mon Oct 29 13:55:23 2018 - [info] 192.168.8.57(192.168.8.57:3306)
Mon Oct 29 13:55:23 2018 - [info] Checking master reachability via MySQL(double check)...
Mon Oct 29 13:55:23 2018 - [info] ok.
Mon Oct 29 13:55:23 2018 - [info] Alive Servers:
Mon Oct 29 13:55:23 2018 - [info] 192.168.8.58(192.168.8.58:3306)
Mon Oct 29 13:55:23 2018 - [info] 192.168.8.59(192.168.8.59:3306)
Mon Oct 29 13:55:23 2018 - [info] Alive Slaves:
Mon Oct 29 13:55:23 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled
Mon Oct 29 13:55:23 2018 - [info] GTID ON
Mon Oct 29 13:55:23 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306)
Mon Oct 29 13:55:23 2018 - [info] Primary candidate
for
the new Master (candidate_master is
set
)
Mon Oct 29 13:55:23 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled
Mon Oct 29 13:55:23 2018 - [info] GTID ON
Mon Oct 29 13:55:23 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306)
Mon Oct 29 13:55:23 2018 - [info] Starting GTID based failover.
Mon Oct 29 13:55:23 2018 - [info]
Mon Oct 29 13:55:23 2018 - [info] ** Phase 1: Configuration Check Phase completed.
Mon Oct 29 13:55:23 2018 - [info]
Mon Oct 29 13:55:23 2018 - [info] * Phase 2: Dead Master Shutdown Phase..
Mon Oct 29 13:55:23 2018 - [info]
Mon Oct 29 13:55:23 2018 - [info] Forcing
shutdown
so that applications never connect to the current master..
Mon Oct 29 13:55:23 2018 - [info] Executing master IP deactivation script:
Mon Oct 29 13:55:23 2018 - [info]
/usr/local/bin/master_ip_failover
--orig_master_host=192.168.8.57 --orig_master_ip=192.168.8.57 --orig_master_port=3306 --
command
=stopssh --ssh_user=root
Mon Oct 29 13:55:24 2018 - [info]
done
.
Mon Oct 29 13:55:24 2018 - [warning] shutdown_script is not
set
. Skipping explicit shutting down of the dead master.
Mon Oct 29 13:55:24 2018 - [info] * Phase 2: Dead Master Shutdown Phase completed.
Mon Oct 29 13:55:24 2018 - [info]
Mon Oct 29 13:55:24 2018 - [info] * Phase 3: Master Recovery Phase..
Mon Oct 29 13:55:24 2018 - [info]
Mon Oct 29 13:55:24 2018 - [info] * Phase 3.1: Getting Latest Slaves Phase..
Mon Oct 29 13:55:24 2018 - [info]
Mon Oct 29 13:55:24 2018 - [info] The latest binary log
file
/position
on all slaves is mysql-bin.000020:375
Mon Oct 29 13:55:24 2018 - [info] Retrieved Gtid Set: a92f70a4-d5ea-11e8-af28-080027c0450d:11-13
Mon Oct 29 13:55:24 2018 - [info] Latest slaves (Slaves that received relay log files to the latest):
Mon Oct 29 13:55:24 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled
Mon Oct 29 13:55:24 2018 - [info] GTID ON
Mon Oct 29 13:55:24 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306)
Mon Oct 29 13:55:24 2018 - [info] Primary candidate
for
the new Master (candidate_master is
set
)
Mon Oct 29 13:55:24 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled
Mon Oct 29 13:55:24 2018 - [info] GTID ON
Mon Oct 29 13:55:24 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306)
Mon Oct 29 13:55:24 2018 - [info] The oldest binary log
file
/position
on all slaves is mysql-bin.000020:375
Mon Oct 29 13:55:24 2018 - [info] Retrieved Gtid Set: a92f70a4-d5ea-11e8-af28-080027c0450d:11-13
Mon Oct 29 13:55:24 2018 - [info] Oldest slaves:
Mon Oct 29 13:55:24 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled
Mon Oct 29 13:55:24 2018 - [info] GTID ON
Mon Oct 29 13:55:24 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306)
Mon Oct 29 13:55:24 2018 - [info] Primary candidate
for
the new Master (candidate_master is
set
)
Mon Oct 29 13:55:24 2018 - [info] 192.168.8.59(192.168.8.59:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled
Mon Oct 29 13:55:24 2018 - [info] GTID ON
Mon Oct 29 13:55:24 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306)
Mon Oct 29 13:55:24 2018 - [info]
Mon Oct 29 13:55:24 2018 - [info] * Phase 3.3: Determining New Master Phase..
Mon Oct 29 13:55:24 2018 - [info]
Mon Oct 29 13:55:24 2018 - [info] Searching new master from slaves..
Mon Oct 29 13:55:24 2018 - [info] Candidate masters from the configuration
file
:
Mon Oct 29 13:55:24 2018 - [info] 192.168.8.58(192.168.8.58:3306) Version=5.7.23-log (oldest major version between slaves) log-bin:enabled
Mon Oct 29 13:55:24 2018 - [info] GTID ON
Mon Oct 29 13:55:24 2018 - [info] Replicating from 192.168.8.57(192.168.8.57:3306)
Mon Oct 29 13:55:24 2018 - [info] Primary candidate
for
the new Master (candidate_master is
set
)
Mon Oct 29 13:55:24 2018 - [info] Non-candidate masters:
Mon Oct 29 13:55:24 2018 - [info] Searching from candidate_master slaves
which
have received the latest relay log events..
Mon Oct 29 13:55:24 2018 - [info] New master is 192.168.8.58(192.168.8.58:3306)
Mon Oct 29 13:55:24 2018 - [info] Starting master failover..
Mon Oct 29 13:55:24 2018 - [info]
From:
192.168.8.57(192.168.8.57:3306) (current master)
+--192.168.8.58(192.168.8.58:3306)
+--192.168.8.59(192.168.8.59:3306)
To:
192.168.8.58(192.168.8.58:3306) (new master)
+--192.168.8.59(192.168.8.59:3306)
Mon Oct 29 13:55:24 2018 - [info]
Mon Oct 29 13:55:24 2018 - [info] * Phase 3.3: New Master Recovery Phase..
Mon Oct 29 13:55:24 2018 - [info]
Mon Oct 29 13:55:24 2018 - [info] Waiting all logs to be applied..
Mon Oct 29 13:55:24 2018 - [info]
done
.
Mon Oct 29 13:55:24 2018 - [info] Getting new master's binlog name and position..
Mon Oct 29 13:55:24 2018 - [info] mysql-bin.000021:415
Mon Oct 29 13:55:24 2018 - [info] All other slaves should start replication from here. Statement should be: CHANGE MASTER TO MASTER_HOST=
'192.168.8.58'
, MASTER_PORT=3306, MASTER_AUTO_POSITION=1, MASTER_USER=
'repl'
, MASTER_PASSWORD=
'xxx'
;
Mon Oct 29 13:55:24 2018 - [info] Master Recovery succeeded. File:Pos:Exec_Gtid_Set: mysql-bin.000021, 415, a92f70a4-d5ea-11e8-af28-080027c0450d:1-13,
a92f70a4-d5ea-11e8-af28-080027c0450f:1-7
Mon Oct 29 13:55:24 2018 - [info] Executing master IP activate script:
Mon Oct 29 13:55:24 2018 - [info]
/usr/local/bin/master_ip_failover
--
command
=start --ssh_user=root --orig_master_host=192.168.8.57 --orig_master_ip=192.168.8.57 --orig_master_port=3306 --new_master_host=192.168.8.58 --new_master_ip=192.168.8.58 --new_master_port=3306 --new_master_user=
'root'
--new_master_password=xxx
Undefined subroutine &main::FIXME_xxx_create_user called at
/usr/local/bin/master_ip_failover
line 94.
Set read_only=0 on the new master.
Creating app user on the new master..
Mon Oct 29 13:55:24 2018 - [error][
/usr/lib/perl5/vendor_perl/MHA/MasterFailover
.pm, ln1612] Failed to activate master IP address
for
192.168.8.58(192.168.8.58:3306) with
return
code 10:0
Mon Oct 29 13:55:24 2018 - [warning] Proceeding.
Mon Oct 29 13:55:24 2018 - [info] ** Finished master recovery successfully.
Mon Oct 29 13:55:24 2018 - [info] * Phase 3: Master Recovery Phase completed.
Mon Oct 29 13:55:24 2018 - [info]
Mon Oct 29 13:55:24 2018 - [info] * Phase 4: Slaves Recovery Phase..
Mon Oct 29 13:55:24 2018 - [info]
Mon Oct 29 13:55:24 2018 - [info]
Mon Oct 29 13:55:24 2018 - [info] * Phase 4.1: Starting Slaves
in
parallel..
Mon Oct 29 13:55:24 2018 - [info]
Mon Oct 29 13:55:24 2018 - [info] -- Slave recovery on host 192.168.8.59(192.168.8.59:3306) started, pid: 7627. Check tmp log
/var/log/masterha/app1/192
.168.8.59_3306_20181029135522.log
if
it takes
time
..
Mon Oct 29 13:55:25 2018 - [info]
Mon Oct 29 13:55:25 2018 - [info] Log messages from 192.168.8.59 ...
Mon Oct 29 13:55:25 2018 - [info]
Mon Oct 29 13:55:24 2018 - [info] Resetting slave 192.168.8.59(192.168.8.59:3306) and starting replication from the new master 192.168.8.58(192.168.8.58:3306)..
Mon Oct 29 13:55:24 2018 - [info] Executed CHANGE MASTER.
Mon Oct 29 13:55:24 2018 - [info] Slave started.
Mon Oct 29 13:55:24 2018 - [info] gtid_wait(a92f70a4-d5ea-11e8-af28-080027c0450d:1-13,
a92f70a4-d5ea-11e8-af28-080027c0450f:1-7) completed on 192.168.8.59(192.168.8.59:3306). Executed 0 events.
Mon Oct 29 13:55:25 2018 - [info] End of log messages from 192.168.8.59.
Mon Oct 29 13:55:25 2018 - [info] -- Slave on host 192.168.8.59(192.168.8.59:3306) started.
Mon Oct 29 13:55:25 2018 - [info] All new slave servers recovered successfully.
Mon Oct 29 13:55:25 2018 - [info]
Mon Oct 29 13:55:25 2018 - [info] * Phase 5: New master cleanup phase..
Mon Oct 29 13:55:25 2018 - [info]
Mon Oct 29 13:55:25 2018 - [info] Resetting slave info on the new master..
Mon Oct 29 13:55:25 2018 - [info] 192.168.8.58: Resetting slave info succeeded.
Mon Oct 29 13:55:25 2018 - [info] Master failover to 192.168.8.58(192.168.8.58:3306) completed successfully.
Mon Oct 29 13:55:25 2018 - [info] Deleted server1 entry from
/etc/masterha/app1
.cnf .
Mon Oct 29 13:55:25 2018 - [info]
----- Failover Report -----
app1: MySQL Master failover 192.168.8.57(192.168.8.57:3306) to 192.168.8.58(192.168.8.58:3306) succeeded
Master 192.168.8.57(192.168.8.57:3306) is down!
Check MHA Manager logs at manager:
/var/log/masterha/app1/manager
.log
for
details.
Started automated(non-interactive) failover.
Invalidated master IP address on 192.168.8.57(192.168.8.57:3306)
Selected 192.168.8.58(192.168.8.58:3306) as a new master.
192.168.8.58(192.168.8.58:3306): OK: Applying all logs succeeded.
Failed to activate master IP address
for
192.168.8.58(192.168.8.58:3306) with
return
code 10:0
192.168.8.59(192.168.8.59:3306): OK: Slave started, replicating from 192.168.8.58(192.168.8.58:3306)
192.168.8.58(192.168.8.58:3306): Resetting slave info succeeded.
Master failover to 192.168.8.58(192.168.8.58:3306) completed successfully.
Mon Oct 29 13:55:25 2018 - [info] Sending mail..
Unknown option: conf
|
可以看到192.168.8.57上MySQL进程宕掉之后,新主库切至192.168.8.58,和192.168.8.59形成新的主从环境。
3.查看VIP
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 |
1: lo:
link
/loopback
00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1
/8
scope host lo
valid_lft forever preferred_lft forever
inet6 ::1
/128
scope host
valid_lft forever preferred_lft forever
2: enp0s3:
link
/ether
08:00:27:4d:70:17 brd ff:ff:ff:ff:ff:ff
inet 192.168.8.58
/24
brd 192.168.8.255 scope global noprefixroute enp0s3
valid_lft forever preferred_lft forever
inet 192.168.8.88
/24
scope global secondary enp0s3
valid_lft forever preferred_lft forever
inet6 fe80::6a31:3e92:8b6f:83c0
/64
scope link noprefixroute
valid_lft forever preferred_lft forever
inet6 fe80::5198:593b:cdc5:1f90
/64
scope link tentative noprefixroute dadfailed
valid_lft forever preferred_lft forever
3: virbr0:
link
/ether
52:54:00:f4:55:bb brd ff:ff:ff:ff:ff:ff
inet 192.168.122.1
/24
brd 192.168.122.255 scope global virbr0
valid_lft forever preferred_lft forever
4: virbr0-nic:
link
/ether
52:54:00:f4:55:bb brd ff:ff:ff:ff:ff:ff
|
VIP192.168.8.88/24已经飘至192.168.8.58机器。
4.查看slave进程
192.168.8.58
1 2 |
mysql> show slave status \G
Empty
set
(0.00 sec)
|
192.168.8.59
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 |
mysql> show slave status \G
*************************** 1. row ***************************
Slave_IO_State: Waiting
for
master
to
send event
Master_Host: 192.168.8.58
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000021
Read_Master_Log_Pos: 415
Relay_Log_File: slave2-relay-bin.000002
Relay_Log_Pos: 414
Relay_Master_Log_File: mysql-bin.000021
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: 415
Relay_Log_Space: 622
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: 58
Master_UUID: a92f70a4-d5ea-11e8-af28-080027c0450f
Master_Info_File: /mysql/data/master.info
SQL_Delay: 0
SQL_Remaining_Delay:
NULL
Slave_SQL_Running_State: Slave has
read
all
relay log; waiting
for
more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set: a92f70a4-d5ea-11e8-af28-080027c0450b:1-4,
a92f70a4-d5ea-11e8-af28-080027c0450d:1-13,
a92f70a4-d5ea-11e8-af28-080027c0450f:1-7
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
|
可以看到从库192.168.8.59的主库变成192.168.8.58
5.测试复制
192.168.8.58(主库)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 |
mysql>
create
table
t10 (id
int
(10));
Query OK, 0
rows
affected (0.19 sec)
mysql> show tables;
+
----------------+
| Tables_in_test |
+
----------------+
| t1 |
| t10 |
| t2 |
| t3 |
| t4 |
| t5 |
| t6 |
| t7 |
| t8 |
| t9 |
+
----------------+
|
192.168.8.59(从库)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
mysql> show tables;
+
----------------+
| Tables_in_test |
+
----------------+
| t1 |
| t10 |
| t2 |
| t3 |
| t4 |
| t5 |
| t6 |
| t7 |
| t8 |
| t9 |
+
----------------+
|