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PROLINUXHUB – Page 4 – Linux and open source articles and tutorials based on real world projects and deployments
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Blocking words in Subject using postfix

In order to block certain words in Subject using postfix the following has to be done. 1. In /etc/postfix/main.cf add the following vi /etc/postfix/main.cf header_checks = regexp:/etc/postfix/header_checks 2. Create header_checks and add the following line. In this example we will block XXX word separated by spaces. vi /etc/postfix/header_checks /^Subject:.*\b(XXX)\b/ DISCARD

Convert VirtualBox .vdi image to qcow2

We needed to convert .vdi image created on VirtialBox hiperviser to qcow2 format for use with KVM. Below are steps that we took to get it done. 1. Convert vdi to raw disk image VBoxManage clonehd --format RAW vmimage.vdi vmimage.img 2. On KVM host we can now convert it to qcow2 qemu-img convert -f raw

Delegate admin access on Zimbra and remove view mail and change password permission

We had a task of creating domain administrator account for Zimbra but without access to users mail and ability to change password. This is how we got it done. We will be using user tmpadmin and domain contose as an example. 1. Create account with Zimbra zmprov CLI tool zmprov ca alex@contoso.com "Your password" 2.

Zimbra Domain Admin Delegation Open Source version 8.x and up

We were assigned a task of creating user account with access to only certain things. This can be done with this simple approach on Zimbra Open Source addition. 1. First create user admin_usr@domain.com for domain for which you want to grant delegation admin access. 2. We create admin_deleg.sh script in /opt/zimbra directory. The script should

MailScanner blacklisting and whitelisting smtp addresses

Lets take a look at what it takes to create whitelists and blacklists rule sets on MailScanner based Email gateways. We assume MailScanner is installed on CentOS version 7, but it should also work on other Linux Distributions.

Deploy AWStats on CentOS 7 to report SMTP traffic

Let’s look at deploying AWStats on CentOS 7 Mail gateway running postfix and MailScanner 1. First lets install httpd if not yet installed yum install httpd 2. In order to install AWStats we will need to install and add EPEL repository yum install epel-release 3. Now we can install AWStats yum install awstats AWStats Configuration

Manage Time service on RH and CentOS 7

When Linux system first boots the hardware clock is read first. The time on the hardware clock read from local hardware clock in UTC – Universal Time. Local time is the actual time in the current time zone. System time, unlike Hardware clock maintained by operating system. System clock is completely independent of the hardware

Deploy Certificate or renew certificate on Zimbra server

In this example we used Zimbra Admin interface to create csr. This is done by going to Configure – Certificates then right click on the server name and then select install certificates. In the menu choose create csr. Ones comepleted submit to certificate authority of your choice – We used Go Daddy. Ones verified we

Deploy LAMP on CentOS7

Many open source p[projects require LAMP with database and database user ready to go. Here we will look at basic commands on CentOS7 to get it up and running quickly.

Deploy ntopng for network monitoring

NTOPNG is excellent bandwidth and network traffic monitoring tool. Lets take a look at deploying this tool on the network using CentOS 7.

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