Installing Let’s Encrypt on a Zimbra Server Rumi, June 15, 2018June 15, 2018 Let’s Encrypt must be installed on one Linux machine to obtain the proper SSL Certificate, CA Intermediate, and Private Key. It is not required that it be on the same Zimbra Server, but it could save time and help to obtain the renewals, etc. First Step is to stop the… Continue Reading
DNS UDP Load Balancer using Nginx Rumi, June 14, 2018March 12, 2023 The plan is to build a DNS- UDP load balancer DNS recursive server (actually forwarding service). The design logic is simple- On client side a public recursive+forwarding DNS IP –> hits the Nginx Load Balancers –> sends traffic to Google Public DNS/IBM Public DNS/Own recursive DNS/OpenDNS. The configuration is quite… Continue Reading
Bind DNS Auto Slave Using Webmin Rumi, June 13, 2018June 13, 2018 The latest webmin has bug! In this tutorials I’m using webmin verison 1.801- that actually works. Don’t know if webmin team really knows are aware of the bug 🙁 So, let’s start. But before that, it’s assumed that you have webmin installed in both the servers. Configuring Webmin Server Continue Reading
Best free bandwidth monitoring software and tools to analyze network traffic usage Rumi, June 13, 2018June 13, 2018 To keep an eye on the health of your network and diagnose problems that crop up, an essential activity is monitoring your bandwidth and knowing which traffic is consuming it. Your ISP promises to provide you with a reliable pipe to the Internet of a certain volume; your chosen network… Continue Reading
Enable WIndows Photo Viewer in Windows 10 Rumi, June 13, 2018 Default windows “Photo” app is clumsy at some point, missed the earlier “Photo Viewer” program. So, going back to root and after googling, here’s a small hack to enable “Windows Photo Viewer” in windows 10 edition. Download the photo.zip and unzip it. You’ll get a photo.reg file. The file is… Continue Reading
Zimbra send http traffic to https or keeping both in mix Rumi, June 10, 2018June 10, 2018 HTTP proxy can support protocol modes for HTTP or HTTPS only, both HTTP and HTTPS, mixed HTTP and HTTPS or HTTPS redirect from HTTP. Redirect is a popular configuration. This configuration must be made to the proxy servers. HTTPS redirect from HTTP zmprov ms proxy.server.name zimbraReverseProxyMailMode redirect HTTP and HTTPS… Continue Reading
Mount CD or DVD Rom in Linux Rumi, June 3, 2018 Finding out your CD/DVD names in Linux Use the following command to find out the name Of DVD / CD-ROM / Writer / Blu-ray device on a Linux based system: # lsblk OR # dmesg | egrep -i –color ‘cdrom|dvd|cd/rw|writer’ Sample outputs (/dev/sr0): [ 5.437164] sr0: scsi3-mmc drive: 24x/24x writer… Continue Reading
Increase mail attachment in Zimbra 8.8 Rumi, June 3, 2018 Postfix configuration (zimbraMtaMaxMessageSize and message_size_limit) You can examine the current value of this parameter like this: # su – zimbra $ postconf message_size_limit message_size_limit = 10240000 This configuration parameter is stored in the zimbra ldap directory, and propagated to postconf’s message_size_limit by zmmtaconfig, which is invoked by the zimbra postfix… Continue Reading
LAMP on Ubuntu 16.04 using Tasksel Rumi, May 12, 2018 Quick Install Using Tasksel Instead of installing Apache, MySQL, and PHP separately, tasksel offers a convenient way to get a LAMP stack running quickly. Install tasksel if not already installed by default. sudo apt install tasksel Use tasksel to install the LAMP stack. sudo tasksel install lamp-server Enter the prompt… Continue Reading