In the previous articles, i’ve been explain how to install and configure Zimbra on CentOS 6 or CentOS 7, how to install and configure online failover/failback on CentOS 6 using Heartbeat and how to install and configure data replication on CentOS 6 using DRBD. All above guidance could be combined to get Zimbra High Availability. For ..
After configuration DRBD in the previous article, we must test first for ensure whether DRBD has been working properly or not. This is some testing to ensure DRBD has been worked # TESTING ON NODE1 – Create folder tmp in /mnt folder mkdir /mnt/tmp – Mount DRBD devices into tmp folder who has been created mount ..
This article will explain how to configure data replication/synchronize using DRBD application. According this article : http://drbd.linbit.com/ DRBD® refers to block devices designed as a building block to form high availability (HA) clusters. This is done by mirroring a whole block device via an assigned network. DRBD can be understood as network based raid-1. For configure DRBD, we ..
This article will explain how to configuration failover/failback using Heartbeat application. According this article : http://linux-ha.org/wiki/Heartbeat Heartbeat is a daemon that provides cluster infrastructure (communication and membership) services to its clients. This allows clients to know about the presence (or disappearance!) of peer processes on other machines and to easily exchange messages with them. In this ..
After installing Zimbra as described at this guidance : installing Zimbra on CentOS 6 or install Zimbra on CentOS 7, by default we could sent email to outside/internet if have the internet connection and port 25 outgoing is not blocked by firewall or blocked by ISP connection. After that, usually try to receive email from internet/outside and ..