[[email protected] db]# sysbench --test=/software/sysbench/sysbench-0.5/sysbench/tests/db/oltp.lua --mysql-table-engine=innodb --mysql-host=127.0.0.1 --mysql-port=3306 --mysql-user=sbtest --mysql-password=sbpass --oltp-table-size=10000 --num-threads=8 run
sysbench 0.5:  multi-threaded system evaluation benchmark

Running the test with following options:
Number of threads: 8
Random number generator seed is 0 and will be ignored


Threads started!
 

分發成功

5）我們將主節點mysql-pxc01關閉掉在檢視狀態

[[email protected] ~]# service mysql stop
Shutting down MySQL (Percona XtraDB Cluster)..........[  OK  ]

ALERT: failed to execute MySQL query: `UPDATE sbtest1 SET c='48430239815-39636634349-44303135689-38090726026-22121476891-44178343736-66628055146-51151353374-76675391132-92944723344' WHERE id=5000`:
ALERT: Error 1317 Query execution was interrupted
FATAL: failed to execute function `event': (null)
ALERT: failed to execute MySQL query: `SELECT DISTINCT c FROM sbtest1 WHERE id BETWEEN 3535 AND 3535+99 ORDER BY c`:
ALERT: Error 1047 Unknown command
FATAL: failed to execute function `event': (null)
ALERT: failed to execute MySQL query: `SELECT DISTINCT c FROM sbtest1 WHERE id BETWEEN 5050 AND 5050+99 ORDER BY c`:
ALERT: Error 1047 Unknown command
FATAL: failed to execute function `event': (null)
ALERT: failed to execute MySQL query: `SELECT DISTINCT c FROM sbtest1 WHERE id BETWEEN 5010 AND 5010+99 ORDER BY c`:
ALERT: Error 1047 Unknown command
FATAL: failed to execute function `event': (null)
 

6）我們再次開啟節點1，看看haproxy在leastconn的分發

由於我們是雙節點的叢集，節點1啟動的時候需要抓取節點2的日誌資料，備節點2不對外服務，所以連線為0。

同步完成後狀態轉化為：

7）節點正常後，由於我們使用的是leastconn，節點1上暫時沒有連線，再次執行命令，建立5個執行緒連線3306埠

[[email protected] ~]# sysbench --test=/software/sysbench/sysbench-0.5/sysbench/tests/db/oltp.lua --mysql-table-engine=innodb --mysql-host=127.0.0.1 --mysql-port=3306 --mysql-user=sbtest --mysql-password=sbpass --oltp-table-size=10000 --num-threads=5 run
sysbench 0.5:  multi-threaded system evaluation benchmark

Running the test with following options:
Number of threads: 5
Random number generator seed is 0 and will be ignored


Threads started!
 

可見leastconn的演算法生效。

[[email protected] db]# sysbench --test=/software/sysbench/sysbench-0.5/sysbench/tests/db/oltp.lua --mysql-table-engine=innodb --mysql-host=127.0.0.1 --mysql-port=3307 --mysql-user=sbtest --mysql-password=sbpass --oltp-table-size=10000 --num-threads=8 run
sysbench 0.5:  multi-threaded system evaluation benchmark

Running the test with following options:
Number of threads: 8
Random number generator seed is 0 and will be ignored


Threads started!

9）斷開節點1

10)恢復節點1

已有的連線不會進行roundrobin迴圈分配

11）我們再次建立6個連線到3307埠

發現每個節點各自分配了3個新連線。

HAProxy能夠實現節點的故障檢測和根據相應演算法進行負載均衡。