When you have to deal with a huge file containing gigabytes of data and need to delete a range of lines from it, opening it with a text editor can be a fatal mistake. As an example, in this post I will demonstrate how to delete a whole database out of a huge SQL dump without messing around with a text editor. Continue reading
Remove a range of lines from a huge file
Posted in Linux Administration
Tagged Linux, sed
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Migrate WordPress site with minimal downtime
Migrating a Wordpress installation from one server to the other sounds like a simple task. Just move the files, copy the database for Wordpress and lets go. But when you start dealing with the DNS entries the whole story gets tricky. Continue reading
Setup Postfix for multiple domains
If you have postfix configured as your mail server you have most likely configured it for one particular domain. If you have more then one domain, you can configure postfix to handle those as well to receive emails for them. In … Continue reading
Posted in Mailserver
Tagged postfix, virtual domains
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Access the internet from server without direct connection
When two servers are connected to each other but only one server has access to the internet, it is always complicate to connect to the server without internet connection as well as you need internet connectivity to update/install packages from the repositories. Here is how you get ride of all the restriction to work comfortable even with the server that has no direct internet access. Continue reading
Posted in Linux Administration
Tagged Linux, routing
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Using the Symfony Validator as a standalone component
It’s easy to think of Symfony as just being a huge full-stack PHP framework, that you either base your entire project around or ignore completely, but in fact, the individual Symfony components can be surprisingly easy to slot into an existing project. This … Continue reading
Posted in PHP
Tagged PHP, Symfony, validation
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Show installed yum packages by size
When you pay for every GB of disc space on your server as it is with an Amazon EC2 instance, you want to make sure that the installed packages are at a minimum. Besides the actual user data, you can as well try to remove packages you don’t need but have been installed for some reasons. Here is how to find the biggest installed packages. Continue reading
Posted in Linux Administration
Tagged CentOS, rpm, sort, yum
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Setup Postfix with SMTP-AUTH and TLS on CentOS
Understanding Postfix Postfix is like a router in a network, just for email traffic. It receives emails from a sender and tries to send them on to their recipient, where the recipient can be the local postfix server or some other … Continue reading
Increase Amazon EBS Volume of a Linux EC2 instance
Increasing the size of a EBS volume is sadly not as easy as tweaking a value. Amazon AWS does not support changing the Volume size on the fly. But there are ways to increase the size. Continue reading
Posted in Linux Administration
Tagged Amazon, EBS, EC2
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Access SSH server without direct connection from the internet
When two servers are connected to each other but only one server has access to the internet, it is always uncomfortable to connect to the server without internet connection. Specially when files need to be copied to the server without direct internet connection. There is a way to make it more comfortable to connect via ssh. Continue reading
