Quick fix for installing python2-certbot-dns-route53 (python2-boto3) in CentOS 7


by Danila Vershinin, January 7, 2019

Just a quick fix for installing python2-certbot-dns-route53 in CentOS 7

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[Fix] ImportError: ‘pyOpenSSL’ module missing required functionality. Try upgrading to v0.14 or newer.


by Danila Vershinin, March 23, 2018

Fix for running Certbot error: ‘pyOpenSSL’ module missing required functionality. Try upgrading to v0.14 or newer.

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Debugging PHP behind Varnish


by Danila Vershinin, January 13, 2018

Some tips on debugging PHP on production system with Varnish server

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Fx for “The requested URL returned error” and “401 Unauthorized while accessing” with git on CentOS 6


by Danila Vershinin, November 2, 2017

Quick fix for git error on CentOS 6 systems

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Varnish 4 and 5. Log slow backend requests


by Danila Vershinin, March 21, 2017

Log slow backend requests using Varnish utility varnishncsa

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Email files from server (shell script)


by Danila Vershinin, March 16, 2017

Send any file or directory form your server gzipped via email! Handy shell script for sharing files from server using email with attachment.

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Varnish “Backend fetch failed”


by Danila Vershinin, January 20, 2017

Troubleshoot Varnish backend fetch failed 503 error

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Mysqldump hangs website? [Solved]


by Danila Vershinin, September 22, 2016

Here is how to run mysqldump properly, without affecting the live website and no slowdown during your database backup

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Magento product thumbnails are not displayed? [SOLVED]


by Danila Vershinin, August 9, 2016

If Magento fails to generate product thumbnails, we have little guide for you how to fix that.

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Top Performance Bottlenecks


by Danila Vershinin, July 17, 2016

Is your website slow? Here’s a list of things to check. Reason and solution format. It’s slow because of your SSL It happens primarily on low end VPS boxes where CPU can’t handle strong ciphers well. You don’t have to sacrifice performance for security, but you can make use of secure ciphers which are faster, […]

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