Installation and Configure Postfix Service with Mariadb Database. (1/7)

Installation of Postfix with Mysql Database step by step(1/7)


# Configure Static ip address to a server

[root@localhost ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp0s3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:e0:d3:c5 brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.2/24 brd 192.168.10.255 scope global dynamic enp0s3
       valid_lft 736sec preferred_lft 736sec
    inet6 fe80::61e1:d548:2e53:232b/64 scope link
       valid_lft forever preferred_lft forever
[root@localhost ~]#

# Change Hostname of the server

[root@localhost ~]# hostnamectl set-hostname master.zmailtech.com
[root@localhost ~]# hostname
mailserver.zmailtech.com
[root@localhost ~]#

[root@localhost ~]# cat /etc/sysconfig/network
# Created by anaconda
HOSTNAME=mailserver.zmailtech.com
[root@localhost ~]# 

# Set SELinux policy in Permissive mode 

[root@mailserver ~]# setenforce 0

[root@mailserver ~]# getenforce

Permissive

[root@mailserver ~]# vim /etc/selinux/config

[root@mailserver ~]# cat /etc/selinux/config

# 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.

SELINUX=permissive

# SELINUXTYPE= can take one of three two values:

# targeted - Targeted processes are protected,

# minimum - Modification of targeted policy. Only selected processes are protected.

# mls - Multi Level Security protection.

SELINUXTYPE=targeted

[root@mailserver ~]# 

# Configure self-sign SSL Certificate.

[root@mailserver ~]# cd /etc/pki/tls/certs/

[root@mailserver certs]# make mailserver.example.com.key

umask 77 ; \

/usr/bin/openssl genrsa -aes128 2048 > mailserver.example.com.key

Generating RSA private key, 2048 bit long modulus

...................+++

.............................+++

e is 65537 (0x10001)

Enter pass phrase:

Verifying - Enter pass phrase:

[root@mailserver certs]# openssl rsa -in mailserver.example.com.key -out mailserver.example.com.key

Enter pass phrase for mailserver.example.com.key:

writing RSA key

[root@mailserver certs]# make mailserver.example.com.csr

umask 77 ; \

/usr/bin/openssl req -utf8 -new -key mailserver.example.com.key -out mailserver.example.com.csr

You are about to be asked to enter information that will be incorporated

into your certificate request.

What you are about to enter is what is called a Distinguished Name or a DN.

There are quite a few fields but you can leave some blank

For some fields there will be a default value,

If you enter '.', the field will be left blank.

-----

Country Name (2 letter code) [XX]:IN

State or Province Name (full name) []:Gujarat

Locality Name (eg, city) [Default City]:Ahmedabad

Organization Name (eg, company) [Default Company Ltd]:example

Organizational Unit Name (eg, section) []:mailserver

Common Name (eg, your name or your server's hostname) []:

Email Address []:testuser@example.com

Please enter the following 'extra' attributes

to be sent with your certificate request

A challenge password []:redhat

An optional company name []:

[root@mailserver certs]# openssl x509 -in mailserver.example.com.csr -out mailserver.example.com.crt -req -signkey mailserver.example.com.key -days 3650

Signature ok

subject=/C=IN/ST=Gujarat/L=Ahmeadabad/O=example/OU=mailserver/emailAddress=testuser@example.com

Getting Private key

[root@mailserver certs]#