Zabbix Troubleshooting Guide: Frequent Errors and Practical Fixes
1. Agent fails to start, PID file missing, semaphore errors Sample logs: PID file /run/zabbix/zabbix_agentd.pid not readable (yet?) after start zabbix-agent.service never wrote its PID file. Failing Agent log indicates IPC/semaphore allocation failure: zabbix_agentd[5922]: cannot open log: cannot cr...