基于mysqld_exporter的pxc监控项

pxc建议的监控项

• 集群完整性检查:

  • wsrep_cluster_status:集群组成的状态.如果不为”Primary”,说明出现”分区”或是”split-brain”状况.

    HELP mysql_global_status_wsrep_cluster_status Generic metric from SHOW GLOBAL STATUS.
    TYPE mysql_global_status_wsrep_cluster_status untyped
    mysql_global_status_wsrep_cluster_status 1

  • wsrep_cluster_size:如果这个值跟预期的节点数一致,则所有的集群节点已经连接.

    HELP mysql_global_status_wsrep_cluster_size Generic metric from SHOW GLOBAL STATUS.
    TYPE mysql_global_status_wsrep_cluster_size untyped
    mysql_global_status_wsrep_cluster_size 3

• 节点状态检查:

  • wsrep_ready: 该值为ON,则说明可以接受SQL负载.如果为Off,则需要检查wsrep_connected.

    HELP mysql_global_status_wsrep_ready Generic metric from SHOW GLOBAL STATUS.
    TYPE mysql_global_status_wsrep_ready untyped
    mysql_global_status_wsrep_ready 1

  • wsrep_connected: 如果该值为Off,且wsrep_ready的值也为Off,则说明该节点没有连接到集群.(可能是wsrep_cluster_address或wsrep_cluster_name等配置错造成的.具体错误需要查看错误日志)

    HELP mysql_global_status_wsrep_connected Generic metric from SHOW GLOBAL STATUS.
    TYPE mysql_global_status_wsrep_connected untyped
    mysql_global_status_wsrep_connected 1

• 复制健康检查:

  • wsrep_flow_control_paused:表示复制停止了多长时间.即表明集群因为Slave延迟而慢的程度.值为0~1,越靠近0越好,值为1表示复制完全停止.可优化wsrep_slave_threads的值来改善.

    HELP mysql_global_status_wsrep_flow_control_paused Generic metric from SHOW GLOBAL STATUS.
    TYPE mysql_global_status_wsrep_flow_control_paused untyped
    mysql_global_status_wsrep_flow_control_paused 0

  • wsrep_cert_deps_distance:有多少事务可以并行应用处理.wsrep_slave_threads设置的值不应该高出该值太多.

    HELP mysql_global_status_wsrep_cert_deps_distance Generic metric from SHOW GLOBAL STATUS.
    TYPE mysql_global_status_wsrep_cert_deps_distance untyped
    mysql_global_status_wsrep_cert_deps_distance 0

  • wsrep_flow_control_sent:表示该节点已经停止复制了多少次.

    HELP mysql_global_status_wsrep_flow_control_sent Generic metric from SHOW GLOBAL STATUS.
    TYPE mysql_global_status_wsrep_flow_control_sent untyped
    mysql_global_status_wsrep_flow_control_sent 0

  • wsrep_local_recv_queue_avg:表示slave事务队列的平均长度.slave瓶颈的预兆.

    HELP mysql_global_status_wsrep_local_recv_queue_avg Generic metric from SHOW GLOBAL STATUS.
    TYPE mysql_global_status_wsrep_local_recv_queue_avg untyped
    mysql_global_status_wsrep_local_recv_queue_avg 0.125

  最慢的节点的wsrep_flow_control_sent和wsrep_local_recv_queue_avg这两个值最高.这两个值较低的话,相对更好.

• 检测慢网络问题:

  • wsrep_local_send_queue_avg:网络瓶颈的预兆.如果这个值比较高的话,可能存在网络瓶颈

    HELP mysql_global_status_wsrep_local_send_queue_avg Generic metric from SHOW GLOBAL STATUS.
    TYPE mysql_global_status_wsrep_local_send_queue_avg untyped
    mysql_global_status_wsrep_local_send_queue_avg 0

  • wsrep_last_committed:最后提交的事务数目

    HELP mysql_global_status_wsrep_last_committed Generic metric from SHOW GLOBAL STATUS.
    TYPE mysql_global_status_wsrep_last_committed untyped
    mysql_global_status_wsrep_last_committed 20

  • wsrep_local_cert_failures和wsrep_local_bf_aborts:回滚,检测到的冲突数目

    HELP mysql_global_status_wsrep_local_bf_aborts Generic metric from SHOW GLOBAL STATUS.
    TYPE mysql_global_status_wsrep_local_bf_aborts untyped
    mysql_global_status_wsrep_local_bf_aborts 0

  HELP mysql_global_status_wsrep_local_cert_failures Generic metric from SHOW GLOBAL STATUS.
  TYPE mysql_global_status_wsrep_local_cert_failures untyped
  mysql_global_status_wsrep_local_cert_failures 0