Suppose you really need a highly available service. Normally you would put a load balancer in front of a server farm. But what happens when the load balancer fails? Well, we could have to load balancers, one which is actually active and the second one kicking in when first one fails.
CentOS 7 – still discovering it. ClamAV & ClamAV Milter related things have changed a bit.
Roundcube Webmail is a mature and nice enough web email interface. The installation process is pretty simple: you need to download the package, unpack it, copy it to the web folder, create a database, import the database schema and configure the app. Create the database and the user: mysql-p create database roundcube; grant all on […]
One of biggest problems nowadays is the SPAM or Bulk mails. Added to the initial Postfix’s configuration of RBL’s you can add some further blockers for SPAM that gets thru. Greylisting One of the things you need to know about spammers is that they send tons of spam. They send so much spam that they […]
Firewall CentOS 7 now uses FirewallD, which is not bad, but I don’t think it’s mature enough. So to just disable it and get back to the classic iptables service there are some steps: systemctl stop firewalld systemctl disable firewalld yum -y install iptables-services systemctl enable iptables systemctl restart iptables If you run dual stack, […]
On a typical Linux mail server mail is stored on the disk either using one big file in /var/mai/%user either in one Maildir in users’s home folder. This Maildir usually contains one small file for each mail stored on your server and some indexing information etc. In this setup, because users are stored on a […]
This mail server will use Postfix as a MTA, Dovecot as an LDA, IMAP/POP Server, and MariaDB(MySQL) to store user login information. It will also use PostfixAdmin web interface to manage domain, users and mail administrators information. HTTPD To run the web administration interface and the Webmail we need to have an HTTP server running. […]
First thing is to chose the Distro. For this install I chose CentOS 7, basically a RHEL clone, version 7 is the latest one. Download You can download the minimal install ISO from here. Then you need to burn this ISO on a CD or on a memory stick in order to be able to […]
I run this website on a physical server that i rent. Recently I wanted to run on the same server a virtual machine, with a different OS, with a public IP address(I use KVM for that, as there’s nothing to really change on the physical server’s OS and performance-wise it’s more than OK). The way […]
On Debian/Ubuntu we would need to search for installed kernel packages, something like this: root@server:~# dpkg –list |grep linux-image ii linux-image-3.2.0-23-generic 3.2.0-23.36 Linux kernel image for version 3.2.0 on 64 bit x86 SMP ii linux-image-3.2.0-56-generic 3.2.0-56.86 Linux kernel image for version 3.2.0 on 64 bit x86 SMP ii linux-image-3.2.0-57-generic 3.2.0-57.87 Linux kernel image for version […]