This thread is just for sharing some useful tip
Zabbix agent 2.2 behind NAT - so only Active checks.
every 10 minutes in logs:
started to fail (ZBX_TCP_READ() failed: [4] Interrupted system call)
10% of metrics works and 90% "no value"
upgrade to zabbix agent 3.2:
1) no more errors in logs
2) Metrics are still `90% don`t work`
Solution: cause of too much overlay networks got hit by MTU limit, so 10% of metrics are comings cause they was in small packets and 90% can`t reach zabbix server.
solved by: `ifconfig eth0 mtu 1400 up`
Zabbix agent 2.2 behind NAT - so only Active checks.
every 10 minutes in logs:
started to fail (ZBX_TCP_READ() failed: [4] Interrupted system call)
10% of metrics works and 90% "no value"
upgrade to zabbix agent 3.2:
1) no more errors in logs
2) Metrics are still `90% don`t work`
Solution: cause of too much overlay networks got hit by MTU limit, so 10% of metrics are comings cause they was in small packets and 90% can`t reach zabbix server.
solved by: `ifconfig eth0 mtu 1400 up`