IT Blog - Page 21 of 153 - Vyacheslav Gapon - personal blog, manuals, articles, notes, development

How to change innodb_flush_method in MySQL

innodb_flush_method defines the method for flushing data from RAM to disk.

High CPU load on Cisco Nexus 3064

Once I discovered on the graphs a large burst of Multicast packets on one of the ports of the Cisco Nexus 3064 switch, while the CPU load increased to 30%, before that it was 12% with L2 traffic of 13 Gbit/s.

Migrating MySQL Directory

Once I created a raid, mounted it as a disk system partition and transferred the MySQL directory directly to it, but in this case there were drawbacks, the lost+found directory could appear, it could not be used for other data, etc., after that I began to transfer the MySQL directory not directly to the partition, but created a directory on it and transferred it to it.

How to update BIOS U30 on HPE DL380 Gen10

For example, I will update the BIOS U30 on the HPE ProLiant DL380 Gen10 server.

Manual update of cPanel

In this article, I will provide examples of updating cPanel and WHM.

Installing NetBox on Ubuntu

NetBox is a web application for documenting and management of computer networks.
With a large number of networks, devices, it allows you to visually place it in racks, maintain a database, etc.
For example, I will perform a test installation of NetBox on Ubuntu 18.04.

Description of DNS Amplification Attacks

In this article, I will briefly describe the principle of DDoS DNS Amplification attacks.

How to change innodb_io_capacity in MySQL

innodb_io_capacity – determines the number of write IOPS for background InnoDB tasks, such as flushing pages from a buffer pool, etc. If the cleanup operation is lagging, then InnoDB can perform cleanup more aggressively at a higher IOPS, which is defined in the innodb_io_capacity_max variable.

Configuring OSPF in Quagga

I will give a simple example of setting up OSPF in Quagga, for the test I will use Hyper-V with a virtual switch and virtual machines running Ubuntu Server 18.04.

Installing and configuring xt_NAT

I will give an example of installing and configuring xt_NAT on Ubuntu Server 14.04 with kernel version 4.4.0-142. xt_NAT may not work on newer kernel versions. According to the developer, it should work on Linux Kernel 3.18 and 4.1. To make it work on newer versions of the kernel, you can find patches.