How to Copy Files with SCP between Linux Servers

1.1 SCP Command Line-An Overview

 

The SCP command line is commonly used to copy files over SSH, and between popular Operating systems like Linux, Mac and Windows in a secure fashion. SCP is used to copy files to/from a remote server. It also allows you to copy files from one remote server to another remote server, without passing traffic through your PC.

Read more

Solution for: fatal: open database /var/lib/postfix/smtpd_scache.db: File exists

If your mail server stops working (neither incoming nor outgoing email works) and you find the following error message in the mail.log file: fatal: open database /var/lib/postfix/smtpd_scache.db: File exists then the smtpd_scache.db might got corrupted. Postfix will recreate this file if it does not exist. So it can be removed to solve the issue: /etc/init.d/postfix ... Read more

Solution for dovecot error: /path/ is no longer mounted. If this is intentional, remove it with doveadm mount

Dovecot is watching the whole server filesystem for modifications and removed or added sub filesystems. If you get errors similar to this one on your server: Aug 30 09:10:23 server1 dovecot: master: Warning: /var/www/clients/client1/web1/log is no longer mounted. If this is intentional, remove it with doveadm mount  (the directory path may vary), then you can ... Read more

Solution for amavisd error – TROUBLE in process_request: Error writing a SMTP response to the socket: Broken pipe – on OpenVZ server

If you get error messages from amavisd similar to the one posted below on a server which is virtualized with OpenVZ: Mar  5 09:09:02 v100 amavis[17378]: (17378-14) (!!)TROUBLE in process_request: Error writing a SMTP response to the socket: Broken pipe at (eval 100) line 987, <GEN44> line 31. then the issue can be caused by ... Read more

Apache mod_security settings for WordPress and ModX

If you use the apache mod_security module on your apache server, you might encounter wrong 403 errors for several URL's of the cms systems. Here are some exception rules to avoid that: For WordPress Blogs <locationmatch "/wp-admin/admin-ajax.php"> SecRuleRemoveById 300013 SecRuleRemoveById 300015 SecRuleRemoveById 300016 SecRuleRemoveById 300017 </locationmatch> <locationmatch "/wp-admin/page.php"> SecRuleRemoveById 300013 SecRuleRemoveById 300015 SecRuleRemoveById 300016 SecRuleRemoveById ... Read more

How to disable MySQL replication on master/master andmaster/slave setups

The following guide shows how to disable and remove mysql replication from two or more mysql servers. These steps can be used for master/slave and master/master mysql setups. The following SQL commands have to be be executed in phpmyadmin or with the mysql commandline program. It is just important that you are logged in as ... Read more

Setting up email routing to gmail / google apps via ISPConfig 3

The following guide describes the steps to add DNS records that route emails from a domain managed in ISPConfig 3 to google apps / gmail. The guide assumes that you have already setup the dns zone for your domain in ispconfig. Login to ISPConfig, click on the DNS module icon in the upper navigation bar, ... Read more

How to exclude mouse pointer by default for screenshots made with gnome-screenshot on Linux

Gnome-Screenshot is the default tool to take screenshots on Ubuntu and Mint and brings a great deal of functionality. While it also has the ability to exclude the mouse pointer for screenshots if you use the graphical interface, you won't find this feature if you want to take them from the command line - the ... Read more

Convert Linux deb and rpm packages into the respectively other format with alien

Sometimes you are forced to compile packages from source because they are not present in your current distribution's package format, which can be really annoying. While this is the safer option, there is also a quicker alternative, which is converting existing packages into the one you need with alien. sudo apt-get install alien Before you ... Read more