泊涯
作者泊涯2020-01-08 09:13
系统测试工程师, 高伟达公司

zabbix4.4 启动失败分析

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zabbix是基于WEB界面提供分布式系统监视以及网络监视功能的企业级开源解决方案,能监视各种网络参数,保证服务器系统的安全运营;并提供灵活的通知机制以让系统管理员快速定位/解决存在的各种问题。

做为开源用户的支持者,我们大部分环境用的软件包含监控软件、数据库、继承应用、操作系统等都是用开源的,例如centos、PG、zabbix、openshift等,但是开源的在成熟度上是不错,但是安装软件有时比较麻烦,例如centos的安全开关,默认情况下会导致我们在安装openshift、zabbix等导致失败,而错误日志提示往往与实际十万三千里,但是有经验的在安装完系统后会有意识性的去修改配置,避免不必要的问题。

如下问题:

在安装配置好zabbix后无法正常启动,原因是SELINUX设置问题导致启动失败。

故障分析:
[root@localhost zabbix]# systemctl start zabbix-server.service
Job for zabbix-server.service failed because a configured resource limit was exceeded. See "systemctl status zabbix-server.service" and "journalctl -xe" for details.
[root@localhost zabbix]# journalctl -xe
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel

-- Unit zabbix-server.service has begun starting up.
1月 07 15:21:17 localhost.localdomain systemd[1]: PID file /run/zabbix/zabbix_server.pid not readable (yet?) after start.
1月 07 15:21:17 localhost.localdomain systemd[1]: zabbix-server.service never wrote its PID file. Failing.
1月 07 15:21:17 localhost.localdomain systemd[1]: Failed to start Zabbix Server.
-- Subject: Unit zabbix-server.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel

-- Unit zabbix-server.service has failed.

-- The result is failed.
1月 07 15:21:17 localhost.localdomain systemd[1]: Unit zabbix-server.service entered failed state.
1月 07 15:21:17 localhost.localdomain systemd[1]: zabbix-server.service failed.
1月 07 15:21:17 localhost.localdomain polkitd[804]: Unregistered Authentication Agent for unix-process:6787:8831344 (system bus name
1月 07 15:21:24 localhost.localdomain polkitd[804]: Registered Authentication Agent for unix-process:6797:8832061 (system bus name :
1月 07 15:21:27 localhost.localdomain systemd[1]: zabbix-server.service holdoff time over, scheduling restart.
1月 07 15:21:27 localhost.localdomain systemd[1]: Starting Zabbix Server...
-- Subject: Unit zabbix-server.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel

-- Unit zabbix-server.service has begun starting up.
1月 07 15:21:27 localhost.localdomain systemd[1]: PID file /run/zabbix/zabbix_server.pid not readable (yet?) after start.
1月 07 15:21:27 localhost.localdomain systemd[1]: zabbix-server.service never wrote its PID file. Failing.
1月 07 15:21:27 localhost.localdomain systemd[1]: Failed to start Zabbix Server.
-- Subject: Unit zabbix-server.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel

-- Unit zabbix-server.service has failed.

-- The result is failed.

1月 07 15:21:27 localhost.localdomain systemd[1]: Unit zabbix-server.service entered failed state.

1月 07 15:21:27 localhost.localdomain systemd[1]: zabbix-server.service failed.

1月 07 15:21:27 localhost.localdomain polkitd[804]: Unregistered Authentication Agent for unix-process:6797:8832061 (system bus name

lines 1907-1944/1944 (END)

Last login: Tue Jan 7 23:24:43 2020 from 10.100.81.67

查看 zabbix 日志分析

发现日志提示权限问题:

5966:20200107:145500.376 using configuration file: /etc/zabbix/zabbix_server.conf

5966:20200107:145500.376 cannot set resource limit: [13] Permission denied

5966:20200107:145500.376 cannot disable core dump, exiting...

5976:20200107:145506.314 Starting Zabbix Server. Zabbix 4.4.4 (revision 3131fdac04

优化修改SELINUX=disabled

[root@localhost selinux]# vi config

This file controls the state of SELinux on the system.

SELINUX= can take one of these three values:

enforcing - SELinux security policy is enforced.

permissive - SELinux prints warnings instead of enforcing.

disabled - No SELinux policy is loaded.

SELINUX=disabled

SELINUXTYPE= can take one of three two values:

targeted - Targeted processes are protected,

minimum - Modification of targeted policy. Only selected #processes are protected.

mls - Multi Level Security protection.

SELINUXTYPE=targeted

重新启动:

[root@localhost ~]# systemctl start zabbix-server.service

[root@localhost ~]# systemctl status zabbix-server.service

● zabbix-server.service - Zabbix Server

Loaded: loaded (/usr/lib/systemd/system/zabbix-server.service; disabled; vendor preset: disabled)

Active: active (running) since 二 2020-01-07 15:26:56 CST; 6s ago

Process: 1529 ExecStart=/usr/sbin/zabbix_server -c $CONFFILE (code=exited, status=0/SUCCESS)

Main PID: 1531 (zabbix_server)

CGroup: /system.slice/zabbix-server.service

└─1531 /usr/sbin/zabbix_server -c /etc/zabbix/zabbix_server.conf

1月 07 15:26:56 localhost.localdomain systemd[1]: Starting Zabbix Server...

1月 07 15:26:56 localhost.localdomain systemd[1]: zabbix-server.service: Supervising process 1531 which is not our child. ...exits.

1月 07 15:26:56 localhost.localdomain systemd[1]: Started Zabbix Server.

Hint: Some lines were ellipsized, use -l to show in full.

[root@localhost ~]#

至此,问题已经得到解决。

最后要提醒各位同行,一般在安装一些开源软件,如MYSQL、POSTGRES、zabbix、openshift等,在安装前先检查下系统对应版本是否与需安装的软件兼容性、在检查下下,防火墙、安全等是否开启,如下:

1、iptables开启和关闭;
2、SELinux开启和关闭;
3、CentOS 6和CentOS 7 firewalld防火墙的开与关等。

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