Vyacheslav, Автор в IT Blog

DSE7420MK2 ethernet port does not work after a thunderstorm

One day, after a thunderstorm, the Ethernet port in the DSE7420MK2 generator control module stopped working. The link appeared and disappeared, but at a distance of 10m the device was not accessible. If you connect with a short 1m cable, then sometimes it was available.

Zabbix ERROR 1273 (HY000) at line 483: Unknown collation: ‘utf8mb4_unicode_ci’

One day I was migrating a Zabbix server database to another server and an error occurred:

Setting up nftables

In this article I will give examples of setting up nftables to replace the outdated iptables.

Monitoring mdadm in Zabbix

I will give an example of simple monitoring of a mdadm software raid in Zabbix.

Solution for heavy CPU load MikroTik CRS106-1C-5S

One day I was asked to look at MikroTik CRS106-1C-5S, whose users could not use the Internet normally, there was no speed and ping requests dropped out. When I looked at CPU utilization, it was almost 100% (in the menu System – Resources).

Can’t open PID file /run/zabbix/zabbix_server.pid (yet?) after start: No such file or directory

Once, on Ubuntu 18.04.6 LTS, I updated the Zabbix server to version 6.0 LTS and the new version did not start.

Configuring BGP on Juniper MX – traffic balancing

I will give an example of setting up eBGP on Juniper MX204 with several uplinks and balancing traffic between them.

Juniper QSFP Temperature low warning set

One day, after connecting several 40G transceivers to the Juniper QFX5100 and MX204 devices, messages from these devices began to arrive on the syslog server:

How to configure BGP prefix-limit on Juniper

I will give an example of setting up prefix-limit for BGP so that a neighbor does not accidentally send more routes than he should.

Juniper SNMP OIDs DDM for optical signal transceivers

I will give an example of receiving an optical signal via SNMP from optical transceivers connected to Juniper devices.