How to Prepare for Zimbra 8 Installation Prerequisites on RHEL 7/CentOS 7

Before we install Zimbra 8, I would recommend you to meet all of these requirements. Some software prerequisites should be installed first, then setup the DNS and MX records, provides internet access to and from the Zimbra server, install the latest patches on the server zimbra 8, properly configure iptables filter or firewalld service, turn off SELinux, turn off unnecessary services that can interfere with the process installation. As a guide, i have prepared a checklist or step -by-step reference to Zimbra e-mail administrator. These steps have been tested on RHEL 7/CentOS 7

1. Prepare for a fully qualified domain name ( FQDN ) for your Zimbra mail server mx record and ensure your domain is configured correctly.

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2. Configure /etc/hosts and hostname.

3. Allow iptables to by-pass all zimbra ports.

4. Disabled SELINUX :

[root@centos7 ~]# vim /etc/sysconfig/selinux

Change enforcing to disabled :

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
# SELINUXTYPE= can take one of these two values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy. Only selected processes are protected.
#     mls - Multi Level Security protection.

5. Stop sendmail, postfix or any MTA service :

[root@centos7 ~]# systemctl stop postfix
[root@centos7 ~]# systemctl disable postfix
[root@centos7 ~]# systemctl stop sendmail
[root@centos7 ~]# systemctl disable sendmail

6. Make sure CentOS and RHEL is the latest :

[root@centos7 ~]# yum update -y

7. Install the required packages and libraries using the following command :

[root@centos7 ~]# yum install perl perl-core ntpl nmap sudo libidn gmp libaio libstdc++ unzip sysstat sqlite -y
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