Zabbix远程命令执行失败
前言问题 : 手机上收到tomcat server【80】 down信息，服务down掉，往往都是有重启操作。重启失败才会报警。如果重启操作执行了，我们就需要查看为何不能启动？
Trigger: Tomcat service【80】is down
Trigger status: PROBLEM
Trigger severity: Disaster
Trigger URL:
Item values:
1. Tomcat status (192.168.96.200:net.tcp.listen): 0
2. *UNKNOWN* (*UNKNOWN*:*UNKNOWN*): *UNKNOWN*
3. *UNKNOWN* (*UNKNOWN*:*UNKNOWN*): *UNKNOWN*
Original event
主机说明：
192.168.96.113: zabbix server
192.168.96.115: zabbix proxy 用于监控主机
192.168.96.200: 被监控的主机
1. 先查看重启动作是否执行。
服务down掉，往往都是有重启操作。重启失败才会报警。如果重启操作执行了，我们就需要查看为何不能启动？首先确保重启操作是否实行成功。登录zabbix web端查看动作的执行，【报表】--> 【动作日志】如下图：
http://i2.运维网.com/images/blog/201802/02/9ef39fe66ab6894a29131aa5eaa7cac7.png
如图，可以看到此命令执行失败，并且提示可能是访问拒绝。我们需要进一步确认出错是否为访问问题。
2. 查看执行命令主机日志
登录192.168.96.200，并查看其zabbix agent端日志。
# tail -5 /var/log/zabbix/zabbix_agentd.log
2325:20170906:192653.587 active check configuration update from started to fail (cannot connect to [:10051]: Interrupted system call)
2325:20170906:192753.599 active check configuration update from is working again
2322:20170906:192754.512 failed to accept an incoming connection: connection from "192.168.96.113" rejected, allowed hosts: "192.168.96.115"
2324:20170906:155824.924 failed to accept an incoming connection: connection from "192.168.96.113" rejected, allowed hosts: "192.168.96.115"
2323:20170906:160824.587 failed to accept an incoming connection: connection from "192.168.96.113" rejected, allowed hosts: "192.168.96.115"
从日志中我们可以知道，zabbix server 192.168.96.113 试图与 192.168.96.200建立连接，192.168.96.200拒绝连接，因为他只能允许192.168.96.115。
3. 解决问题
192.168.96.113用代理服务器192.168.96.115采集数据，而远程命令是无法交由proxy执行(zabbix server 和zabbix proxy 支持的文件看附录一)。
grep ^ /etc/zabbix/zabbix_agentd.conf
PidFile=/var/run/zabbix/zabbix_agentd.pid
LogFile=/var/log/zabbix/zabbix_agentd.log
LogFileSize=0
EnableRemoteCommands=1
LogRemoteCommands=1
Server=192.168.96.115
ServerActive=192.168.96.115
Hostname=192.168.96.200
Include=/etc/zabbix/zabbix_agentd.d/
可以看到server仅为192.168.96.115,故192.168.96.113无法执行远程命令。我们需要将server=10.60.96.115修改为server=10.60.96.113,10.60.96.115。
注意 : zabbix agent 配置文件修改需要重启服务，
centos 6上： ~]# service zabbix-agent start
centos 7 上：~]# systemctl start zabbix-agent
编译安装：请找到安装目录下的sbin目录，并运行zabbix_agentd命令。
附录一：
Function
Supported by proxy
Zabbix agent checks
Yes
Zabbix agent checks (active)
Yes
Simple checks
Yes
Trapper items
Yes
SNMP checks
Yes
SNMP traps
Yes
IPMI checks
Yes
JMX checks
Yes
Log file monitoring
Yes
Internal checks
Yes
SSH checks
Yes
Telnet checks
Yes
External checks
Yes
Built-in web monitoring
Yes
Network discovery
Yes
Low-level discovery
Yes
Calculating triggers
No
Processing events
No
Sending alerts
No
Remote commands *
No
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