Send mail Configuration on linux

Send mail Configuration on linux
We are going to Send mail Configuration on linux

•A linux server with ip address 192.168.1.1 and hostname Server
•A linux client with ip address 192.168.1.2 and hostname Client1
•A Configured DNS server on Linux server
•Updated /etc/hosts file on both linux system
•Running portmap and xinetd services
•Firewall should be off on server

Configure the DNS server before start configuration of sendmail server.

Required RPM:

1.Sendmail
2.M4

#yum install sendmail
#yum install m4

Mail server program reads the /etc/mail/sendmail.cf. When Sendmail is started or restarted with the service sendmail restart command a new sendmail.cf file is automatically generated if sendmail.mc has been modified.

open /etc/mail/sendmail.mc for editing
#vi /etc/mail/sendmail.mc
show hidden line with : set nu option on vi command mode
By default, the following line limits sendmail access to connect local host only [line no 116]
You can allow other computers to use your sendmail server by commenting out this line.

DAEMON_OPTION(‘Port=smtp, Addr=127.0.0.1, Name=MTA’)dnl 

comment this line with dnl keyword followed by # sign

dnl # DAEMON_OPTION(‘Port=smtp, Addr=127.0.0.1, Name=MTA’)dnl
save this file with :wq and exit.
Now generate new sendmail.cf file by using m4 command as shown here
#m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
Now restart sendmail service and also set it on with chkconfig
#chkconfig sendmail on
#service sendmail restart
if sendmail service restart without any error means you have configured sendmail successfully.

Configure sendmail client side

Required RPM:

1.Sendmail
2.M4
Now generate new sendmail.cf file by using m4 command as shown here
#m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
Now restart sendmail service and also set it on with chkconfig
#chkconfig sendmail on
#service sendmail restart

Testing of sendmail server

We will test sendmail server by sending and receiving mail in lab environment. for this we use two user one on each system.
Now create one user on each system abu on server
#useradd abu
#passwd abu
and Thagir on client system
#useradd thagir
#passwd thagir
Now send mail from user abu to thagir and from thagir to user abu and also check each other’s mail by mail command
Use full user name to send mail. For example to send mail to nikita use thagir@client1
#mail abu@server.example.com
Subjest: test mail
This is test mail
Press Ctrl+C
Now check on user abu mail box.

Apache configuration/Web server configuration in RHEL 6

We are going to see Apache configuration/Web server configuration in RHEL 6 Linux.
Remember before configuring  web server, we must configure DNS/DHCP server to receive the correct traffic.

Required RPM’s:
1. Httpd
2. Httpd-devel

Install the required RPM’s using below commands.

#yum install http*  -> command will install the required rpm package including dependency.

Now configure the IP Address with 192.168.1.10 and check whether its configured properly or not. Without proper network configuration httpd service will wont start.

#ifconfig eth0 192.168.1.10 255.255.255.0
#ifconfig eth0

Now start httpd daemons and check the status

#chkconfig httpd on
#service httpd start
#service httpd status

Now configure Hosting:

We will host www.exampleweb.com to apache server and create index page under the root directory.

#mkdir –p /var/www/virtual/www.exampleweb.com/html
#vi /var/www/virtual/www.exampleweb.com/html/index.html

Just enter some text for testing purpose in index.html
<b> this is test page</b>

Bind system ip with www.exampleweb.com on /etc/hosts file. Usinf vi editor open the file and append like below.

#vi /etc/hosts
192.168.1.10 
www.exampleweb.com

Save and exit from the file using :wq

Now locate virtual host tag and remove # on apache configuration file (/etc/httpd/conf/httpd.conf)

#vi /etc/httpd/conf/httpd.conf
NameVirtualHost 192.168.1.10

Copy and paste the last seven line from the file and change as shown below.

<VirtualHost 192.168.1.10>
ServerAdmin
root@www.exampleweb.com
DocumentRoot /var/www/cirtual/www.exampleweb.com/html
ServerName
www.exampleweb.com
ErrorLog logs/dummy-www.exampleweb.com-error_log
CustomerLog logs/ dummy-www.exampleweb.com-access_log common
</Virtualhost>

Now restart the httpd service to effect the new configuration

#service httpd restart

Using links command will check the page

#links www.exampleweb.com
This is a test page
If you got out as whatever you have entered in index.html page than you have configured very well.