Recently, one of our customers asked us to upgrade his server hardware. Unfortunately, they can’t update their software and We had to install Centos 6 with new NVMe drives. But, We need to monitor them and default smartmontools don’t support NVMe on Centos 6.X. Also, you can read about how to install smartmontools in the […]
Linux
Monitor HDD and SSD with smartd and smartctl
Basic information smartd is a daemon that monitоrs the Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T) system that is built into most ATA/SATA and SCSI/SAS drives and solid-state drives. smartctl is a command-line utility designed to perform SMART tasks such as printing the SMART self-test and error logs, enabling and disabling SMART automatic testing, and initiating […]
TIME_WAIT queue troubles
Recently, We described how to configure your server for high load and prevention of DDoS. Today, We will speak about the time_wait queue trouble. Those who develop services actively working with the network can step on the features of the TCP protocol: the transition of many (or all free) ports to the TIME_WAIT state. There […]
Intel I219-LM Centos 6 network failed to start
Introduction If you are using old software on new software you can receive some weird errors. Today We will describe an error with Inle l219-LM and CentOS 6 error. For some reason from time to time, Centos 6 fails to start network when using the Intel I219-LM network card. We’ve faced the following issue with […]
How To Install Python 3 On CentOS 7 Using SCL
Introduction Python is an interpreted, high-level, general-purpose programming language. Created by Guido van Rossum and first released in 1991, Python’s design philosophy emphasizes code readability with its notable use of significant whitespace. Its language constructs and object-oriented approach aim to help programmers write clear, logical code for small and large-scale projects. It’s an incredible programming […]
Ngrok how to share localhost to world
Often there is a need to open your computer for access via the Internet, for all comers or with a password. For example, if you want to demonstrate a new code, publish files, or simply record all network traffic for research purposes. To do this, you need to install a web server and direct traffic […]
sysctl setting for high load and prevent DDoS
Introduction There are quite a few different examples of Linux kernel configurations on the Internet to support a large number of connections, heavily loaded web projects, and counter DDoS attacks. Here is another example that I have already been able to try in practice. I will say right away – it more than helped me. […]
Magento 2.3.3 Redis cache grows unlimited
Introduction Recently, one of our customers had troubles with redis-cache on his production multistore with 30 stores on it. His Redis became unavailable from time to time. We start to monitor it and found that there were too many expired Redis keys inside the database. Example of output: > info keyspace # Keyspace db0:keys=45775,expires=41711,avg_ttl=79567831 Possible […]
Insert into search_tmp… queries never ends
Introduction Magento uses MySQL’s fulltext for search. From time to time when your store has many search request MySQL can have many queries like: INSERT INTO search_tmp… Why it happens? It happens when your store has many catalogsearch request. How to fix this INSERT INTO search_tmp issue? Will be fixed since Magento 2.3.4. Hotfix/another fixes […]
UbuntuDDE new upcoming Linux distribution
Introduction Today we present one of the topics that will help you get the usual stability of Ubuntu LTS, but with the amazing beauty of Deepin Desktop out of the box. Deepin (DDE) is a work environment with an intuitive interface. The UbuntuDDE project combines the power of Ubuntu with the beauty of Deepin. Ubuntu […]