zabbix3.0.2 使用percona的mysql插件的遇到的诡异问题解决记录

-->前言

在使用percona zabbix mysql模版插件的过程中，碰到的一些问题记录在此，后续如果再碰到的话，也一起记录下来，好记星不如烂笔头，这是真理啊~

1，报错记录ERROR: Can't connect to local MySQL

调试报错：

[root@db_master_2 zabbix_agentd.d]# /usr/bin/php -q /var/lib/zabbix/percona/scripts/ss_get_mysql_stats.php --host localhost --items gg ERROR: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)[root@db_master_2 zabbix_agentd.d]# [root@db_master_2 zabbix_agentd.d]#

解决方案：
做软连接，ln -s /usr/local/mysql/mysql.sock /var/lib/mysql/mysql.sock，做完软连接后需要重启zabbix_agentd才能生效。

[root@db_m2_slave1 ~]# mkdir -p /var/lib/mysql/ [root@db_m2_slave1 ~]# ln -s /usr/local/mysql/mysql.sock /var/lib/mysql/mysql.sock [root@db_m2_slave1 ~]# [root@db_m2_slave1 ~]# killall zabbix_agentd [root@db_m2_slave1 ~]# /usr/sbin/zabbix_agentd -c /etc/zabbix/zabbix_agentd.conf [root@db_m2_slave1 ~]#

2，报错记录server端获取不了数据

现象是agent能获得数据，但是server端获得不了数据：
（1）agentd端mysql服务器能获得数据：
[root@db_m2_slave1 ~]# /usr/bin/php -q/var/lib/zabbix/percona/scripts/ss_get_mysql_stats.php --host localhost --itemsgg
gg:6
[root@db_m2_slave1 ~]#
（2）zabbix-server端获取不数据
[root@zabbix_serv_121_12 scripts]#/usr/local/zabbix/bin/zabbix_get -s 192.161.3.72 -p10050 -k "MySQL.Threads-connected"
ERROR: run the command manually toinvestigate the problem: /usr/bin/php -q/var/lib/zabbix/percona/scripts/ss_get_mysql_stats.php --host localhost --itemsgg
[root@zabbix_serv_121_12 scripts]#

那么问题在哪里呢？这要从zabbix-sever和zabbix-agentd的原理流程分析起了，sever是通过zabbix的根目录去调用/etc/zabbix/zabbix_agentd.d/userparameter_percona_mysql.conf里面获取参数MySQL.Threads-connected的，所以我们去找这个userparameter_percona_mysql.conf的此参数值的获取方法。

root@db_m2_slave1 ~]# more /etc/zabbix/zabbix_agentd.d/userparameter_percona_mysql.conf |grep MySQL.Threads-connected UserParameter=MySQL.Threads-connected,/var/lib/zabbix/percona/scripts/get_mysql_stats_wrapper.sh iu [root@db_m2_slave1 ~]#

然后执行此参数方法：查看执行记录，果然报错，调用不出来记录：

[root@db_m2_slave1 ~]# sh /var/lib/zabbix/percona/scripts/get_mysql_stats_wrapper.sh kt ERROR: run the command manually to investigate the problem: /usr/bin/php -q /var/lib/zabbix/percona/scripts/ss_get_mysql_stats.php --host localhost --items gg

使用bash跟踪问题，查看到问题在于“+ '[' -e /tmp/localhost-mysql_zabbix_stats.txt ']'
”后报错，如下所示：

[root@db_m2_slave1 ~]# bash -x /var/lib/zabbix/percona/scripts/get_mysql_stats_wrapper.sh kt + echo '' + ITEM=kt + HOST=localhost ++ dirname /var/lib/zabbix/percona/scripts/get_mysql_stats_wrapper.sh + DIR=/var/lib/zabbix/percona/scripts + CMD='/usr/bin/php -q /var/lib/zabbix/percona/scripts/ss_get_mysql_stats.php --host localhost --items gg' + CACHEFILE=/tmp/localhost-mysql_zabbix_stats.txt + '[' kt = running-slave ']' + '[' -e /tmp/localhost-mysql_zabbix_stats.txt ']' + /usr/bin/php -q /var/lib/zabbix/percona/scripts/ss_get_mysql_stats.php --host localhost --items gg + '[' -e /tmp/localhost-mysql_zabbix_stats.txt ']' + echo 'ERROR: run the command manually to investigate the problem: /usr/bin/php -q /var/lib/zabbix/percona/scripts/ss_get_mysql_stats.php --host localhost --items gg' ERROR: run the command manually to investigate the problem: /usr/bin/php -q /var/lib/zabbix/percona/scripts/ss_get_mysql_stats.php --host localhost --items gg

那么就去看下这个文件在不在，果然不在，那么建个空文件，然后赋予zabbix帐号权限：
[root@db_m2_slave1 ~]# vim/tmp/localhost-mysql_zabbix_stats.txt
[root@db_m2_slave1 ~]# chown -Rzabbix:zabbix /tmp/localhost-mysql_zabbix_stats.txt
[root@db_m2_slave1 ~]#

然后再bash调用执行命令：

[root@db_m2_slave1 ~]# bash -x /var/lib/zabbix/percona/scripts/get_mysql_stats_wrapper.sh kt + echo '' + ITEM=kt + HOST=localhost ++ dirname /var/lib/zabbix/percona/scripts/get_mysql_stats_wrapper.sh + DIR=/var/lib/zabbix/percona/scripts + CMD='/usr/bin/php -q /var/lib/zabbix/percona/scripts/ss_get_mysql_stats.php --host localhost --items gg' + CACHEFILE=/tmp/localhost-mysql_zabbix_stats.txt + '[' kt = running-slave ']' + '[' -e /tmp/localhost-mysql_zabbix_stats.txt ']' ++ stat -c %Y /tmp/localhost-mysql_zabbix_stats.txt + TIMEFLM=1463491777 ++ date +%s + TIMENOW=1463491788 ++ expr 1463491788 - 1463491777 + '[' 11 -gt 300 ']' + '[' -e /tmp/localhost-mysql_zabbix_stats.txt ']' + cat /tmp/localhost-mysql_zabbix_stats.txt + sed 's/ /\n/g; s/-1/0/g' + grep kt + awk -F: '{print $2}' [root@db_m2_slave1 ~]#

然后在zabbix-server上测试验证：

[root@zabbix_serv_121_12 scripts]# /usr/local/zabbix/bin/zabbix_get -s 192.161.3.72 -p10050 -k "MySQL.Threads-connected" 9 [root@zabbix_serv_121_12 scripts]#

3，监控图无缘无故断了一段时间

监控图上面的图突然断了，没有显示，如zabbix-serber上check下，报错：

[root@zabbix_serv_121_12 scripts]# /usr/local/zabbix/bin/zabbix_get -s 192.161.3.72 -p10050 -k "MySQL.Threads-connected" rm: cannot remove `/tmp/localhost-mysql_cacti_stats.txt': Operation not permitted 8 [root@zabbix_serv_121_12 scripts]#

去agent端授予权限，发现文件不存在：

[root@db_m2_slave1 zabbix_agentd.d]# chown -R zabbix:zabbix localhost-mysql_cacti_stats.txt chown: cannot access `localhost-mysql_cacti_stats.txt': No such file or directory [root@db_m2_slave1 zabbix_agentd.d]#

为什么文件会丢失呢？去分析执行文件sh脚本，看到有rm -f$CACHEFILE;有删除操作，而CACHEFILE的定义是CACHEFILE="/tmp/$HOST-mysql_cacti_stats.txt"，也就是说这里rm了，那我可以用情况命令echo“”> $CACHEFILE;来取代下，尝试看看，脚本修改如下：

echo "" >> /tmp/$HOST-mysql_cacti_stats.txt ITEM=$1 HOST=localhost DIR=`dirname $0` CMD="/usr/bin/php -q $DIR/ss_get_mysql_stats.php --host $HOST --items gg" #CACHEFILE="/tmp/zabbix/$HOST-mysql_cacti_stats.txt:3317" CACHEFILE="/tmp/$HOST-mysql_cacti_stats.txt" if [ "$ITEM" = "running-slave" ]; then # Check for running slave #RES=`HOME=~zabbix mysql -e 'SHOW SLAVE STATUS\G' | egrep '(Slave_IO_Running|Slave_SQL_Running):' | awk -F: '{print $2}' | tr '\n' ','` RES=`/usr/local/mysql/bin/mysql -e 'SHOW SLAVE STATUS\G' | egrep '(Slave_IO_Running|Slave_SQL_Running):' | awk -F: '{print $2}' | tr '\n' ','` if [ "$RES" = " Yes, Yes," ]; then echo 1 else echo 0 fi exit elif [ -e $CACHEFILE ]; then # Check and run the script #TIMEFLM=`stat -c %Y /tmp/zabbix/$HOST-mysql_cacti_stats.txt:3317` TIMEFLM=`stat -c %Y /tmp/$HOST-mysql_cacti_stats.txt` TIMENOW=`date +%s` if [ `expr $TIMENOW - $TIMEFLM` -gt 300 ]; then #rm -f $CACHEFILE，这里也可以直接注释掉不加下面的echo "" > $CACHEFILE echo "" > $CACHEFILE $CMD 2>&1 > /dev/null fi else $CMD 2>&1 > /dev/null Fi # Parse cache file if [ -e $CACHEFILE ]; then cat $CACHEFILE | sed 's/ /\n/g; s/-1/0/g'| grep $ITEM | awk -F: '{print $2}' else echo "ERROR: run the command manually to investigate the problem: $CMD" fi

然后重启agentd，再去zabbix-server 检测有值了，如下所示：

[root@zabbix_serv_121_12 scripts]# /usr/local/zabbix/bin/zabbix_get -s 192.161.3.72 -p10050 -k "MySQL.innodb-transactions" 1131684198 [root@zabbix_serv_121_12 scripts]# /usr/local/zabbix/bin/zabbix_get -s 192.161.3.72 -p10050 -k "MySQL.Threads-connected" 4 [root@zabbix_serv_121_12 scripts]#