Vyacheslav

Recovering MySQL InnoDB after power failure

Once, after the power was turned off, the UPS was discharged, then the generator automatic start did not work because it turned on and off several times, as a result, the server with MySQL was also started and disconnected from the power supply several times, later the tables of different databases were damaged , including the default database with mysql users, as a result, the MySQL daemon did not start.

Changing InnoDB log file size in MySQL

InnoDB log file size – the size of the transaction log files that are needed to cancel transactions and restore the database in case of failure.

Logrotate Bind9

Suppose Bind9 logs are written to the /var/log/named/ directory, have the .log extension and so that the disk space does not overflow with logs, configure logrotate.

“Lock the self-replacement of SIM” at Kyivstar

Usually, simple SIM cards of the Kyivstar mobile operator, bought in some kind of stall or store, can be replaced independently with a new SIM card, for example, you can buy another SIM card there and call the operator, say that the old card is lost, report the last few dialed and accepted numbers, then the operator will block the old SIM card and activate a new one but with the same number that was on the old one.

Configuring VLAN on Mimosa B5c

It took one time to configure several VLANs on the Mimosa B5c, the devices were already installed and the traffic passed through them without a tag in one VLAN.

Hard reset D-Link DES-1210-28/ME

On the test, I will use the D-Link DES-1210-28/ME Rev.B2 switch with firmware 6.07.B002.

How to copy contacts from Nokia C6 to a SIM card

Many people cannot figure out how to copy contacts from a phone to a SIM card, because the menu has the function of copying contacts from a SIM card to a phone, but on the contrary, no.
For example, I will use the phone Nokia C6-01.

How to remove an IP address from email blacklists

Once I had to remove from the blacklists IP addresses of different dedicated servers located in data centers, since some mail services did not receive emails from them, due to the fact that the previous tenant did not use the IP address honestly or had viruses, spammed, and the current one got locks.

How to roll back the kernel version on Ubuntu

Sometimes after updating the kernel of the system, some important services start to work incorrectly and in order not to look for a problem on the combat server, and to do it for example later on the virtual one, you can boot the system from the previous version of the kernel.

Online diagnostics Cisco Catalyst 6500

In this article, I will describe the Cisco Catalyst 6500 online diagnostic commands.