I described in one of my earlier post how to Setup Postfix with SMTP-AUTH and TLS on CentOS. I will follow up on this article describing how to harden the configuration of your mail server related to SSL. Continue reading
Harden the SSL configuration of your mailserver
Posted in Mailserver, Security
Tagged Dovecot, openssl, postfix
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Fix MySQL replication error
When you setup replication you need to make sure that no other data is available in the slave that can cause the data to be inconsistent. But if you run into problems like I had, you might notice that the … Continue reading
Git repository cluster setup
When you have gitosis and a number of repositories installed on a server and need to move them to another server or you want to build a cluster to have more then one server having serving the repository. This will describe how I solved this with my gitosis repositories. Continue reading
Posted in Linux Administration, Version control system
Tagged cluster, git, gitosis, master-master, Replication
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Setup mysql master slave replication
MySQL server provides replication functionality to replicate data from a master server to multiple slave servers. The concept behind it is that there is one master server that allows read and write access and one or more slave servers that … Continue reading
Access a service without direct internet connection
When two servers are connected to each other but only one server has access to the internet, services on the server that is not connected directly to the internet cannot be accessed directly. The server connected to the internet has to forward the ports to the services you want to reach on the second server. This will show you how to configure that. Continue reading
Posted in Linux Administration
Tagged CentOS, iptables, port forwarding
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Setup gitosis to manage git repositories
With git you can have a repository on your client working independently and even not having any remote repository. But if you wane share your work with others, a remote repository will be needed. Such a remote repository can be easy set up. Continue reading
Posted in Version control system
Tagged CentOS, git, gitosis, ssh key
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SSH-Key authentication is not working – SELinux
When configuring SSH passwordless login with ssh-key the ssh-key generated and transfered to the server seems to not work when I try to login. Whay is the ssh-key authentication failing? Continue reading
Show network routes on MacOSX
When working with Linux you get used to the way Linux is handling things. But when you switch from Linux to Mac OS X you notice that things are handled differently. One of these differences I came across recently. Its about the way you read out the routes you currently have currently active. Continue reading
Posted in Linux Administration, MacOSX
Tagged network, routing
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Migrate Baikal with minimal downtime
Baikal is a CalDAV and CardDAV implementation based on PHP and MySQL. This post will explain how to migrate a Baikal installation from one server to another with minimum downtime. DNS entries can take up to 24 hours to be propagated to all DNS servers around … Continue reading
SELinux allow webserver to send email
When Wordpress tries to send email and you see “your host may have disabled the mail() function” it might be that SELinux is blocking it. Here is how to enable it. Continue reading
Posted in Linux Administration, Security
Tagged Apache, SELinux, Wordpress
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