Mail Server-Postfix+Centos+Dovecot

Setup mail server in centos 6

» Installing and configuring postfix

» Installing and configuring dovecot

» Creating users and testing

» Installing and configuring squirrelmail

» Installing and configuring postfix

 

Step 1 »Before installation assign a static ip and add a host entry for your domain to that IP in the /etc/hosts file like below.
echo "23.236.147.74 keralainindia.asia" >> /etc/hosts
Step 2 » install postfix

[root@kerala ~]# yum -y install postfix

Step 3 » install SMTP AUTH packages .

[root@kerala ~]# yum -y install cyrus-sasl cyrus-sasl-devel cyrus-sasl-gssapi cyrus-sasl-md5 cyrus-sasl-plain

Postfix package installation is completed .

Step 4 »creating SSL Cert.

[root@kerala ~]# mkdir /etc/postfix/ssl
[root@kerala ~]# cd /etc/postfix/ssl/
[root@kerala ssl]# openssl genrsa -des3 -rand /etc/hosts -out smtpd.key 1024
[root@kerala ssl]# chmod 600 smtpd.key
[root@kerala ssl]# openssl req -new -key smtpd.key -out smtpd.csr
[root@kerala ssl]# openssl x509 -req -days 365 -in smtpd.csr -signkey smtpd.key -out smtpd.crt
[root@kerala ssl]# openssl rsa -in smtpd.key -out smtpd.key.unencrypted
[root@kerala ssl]# mv -f smtpd.key.unencrypted smtpd.key
[root@kerala ssl]# openssl req -new -x509 -extensions v3_ca -keyout cakey.pem -out cacert.pem -days 365

Step 4 » Now open /etc/postfix/main.cf file .

Find and comment the below lines .
#inet_interfaces = localhost #---> line no 116
#mydestination = $myhostname, localhost.$mydomain, localhost #--> line no 164

and add these lines at the bottom of the file.

myhostname = mail.keralainindia.asia
mydomain = keralainindia.asia
myorigin = $mydomain
home_mailbox = mail/
mynetworks = 127.0.0.0/8
inet_interfaces = all
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
smtpd_sasl_auth_enable = yes
smtpd_sasl_type = cyrus
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_sasl_authenticated_header = yes
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
smtpd_tls_auth_only = no
smtp_use_tls = yes
smtpd_use_tls = yes
smtp_tls_note_starttls_offer = yes
smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key
smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt
smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom

 

Step 5 » Now open /etc/postfix/master.cf file and add the below line after smtp

smtps inet n - n - - smtpd
-o smtpd_sasl_auth_enable=yes
-o smtpd_reject_unlisted_sender=yes
-o smtpd_recipient_restrictions=permit_sasl_authenticated,reject
-o broken_sasl_auth_clients=yes

Step 6 » Now start postfix and saslauthd service

[root@kerala ~]# service postfix start

[root@kerala ~]# service saslauthd start

» Issue the below commands to start the postfix and saslauthd at startup
[root@kerala ~]# chkconfig --level 235 postfix on

[root@kerala ~]# chkconfig --level 235 saslauthd on

Step 7 » Now check your smtp connectivity . just telnet localhost on port 25 and type this command ehlo localhost

[root@kerala ~]# telnet localhost 25
Trying ::1...
Connected to localhost.
Escape character is '^]'.
220 mail.keralainindia.asia ESMTP Postfix
ehlo localhost <---- type this command
250-mail.keralainindia.asia
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
quit
221 2.0.0 Bye
Connection closed by foreign host.

If you get this output .. Great .. everything is fine till now.

» Installing and configuring dovecot

Step 8 » Issue this command to install dovecot

[root@kerala ~]# yum -y install dovecot

 

Step 9 » After installation open /etc/dovecot/dovecot.conf file and add the below line at the end of the file. please make sure mail_location and home_mailbox in postfix configuration are using the same name.

protocols = imap pop3
mail_location = maildir:~/mail
pop3_uidl_format = %08Xu%08Xv

 

Step 10 » Now start dovecot service
[root@kerala ~]# service dovecot start

» Issue the below command to start the dovecot at startup
[root@kerala ~]# chkconfig --level 235 dovecot on

 

Step 11 » Now test your pop3 connectivity .
[root@kerala ~]# telnet localhost 110
Trying ::1...
Connected to localhost.
Escape character is '^]'.
+OK Dovecot ready.
quit
+OK Logging out
Connection closed by foreign host.

Yes .. your server is ready to receive mails .

» Creating users and testing
Step 11 » Now create users to test your configuration.
[root@kerala ~]# useradd -m ramraj -s /sbin/nologin
and create passwords for the users created
[root@kerala ~]# passwd ramraj
Step 12 » Now you can send and receive mails using this server. In case of any issues please check the log file /var/log/maillog )

your mail server is ready …

» Installing and configuring squirrelmail

Step 13 » you need to add EPEL repository to install squirrelmail package. you can find latest EPEL repository rpm here ( http://ftp.jaist.ac.jp/pub/Linux/Fedora/epel/6/i386/repoview/epel-release.html )
[root@kerala ~]# rpm -ivh http://ftp.jaist.ac.jp/pub/Linux/Fedora/epel/6/i386/epel-release-6-8.noarch.rpm

Step 14» Issue the below command to install squirrelmail.
[root@kerala ~]# yum install squirrelmail

This command will install squirrelmail along with apache and php.

Step 15 » Now run the below command to configure squirrelmail .
[root@kerala ~]# perl /usr/share/squirrelmail/config/conf.pl

»»» 1 »»» 1 »»» krizna (type Organization name ) »»» R ( return )
»»» 2 »»» 1 »»» ( hit space for empty Domain name ) and choose 3 »»» SMTP ( choose SMTP ) »»» R ( return )
»»» D »»» dovecot ( type ) »»» press enter with default
»»» s ( save and quit)
Step 16 » Open /etc/httpd/conf.d/squirrelmail.conf file and uncomment below lines if you are using ssl. If you are not using ssl Don't Do it.
# RewriteCond %{HTTPS} !=on
# RewriteRule (.*) https://%{HTTP_HOST}%{REQUEST_URI}

Step 17» start apache service
[root@kerala ~]# service httpd start

» Issue the below commands to start the httpd at startup
[root@kerala ~]# chkconfig --level 235 httpd on

Step 18» Now open http://serverip/webmail path in your browser .

Git Part 2

http://superuser.com/questions/261060/git-how-can-i-config-git-to-ignore-file-permissions-changes
turn off the filemode so that permissions of files are not considered.

For Mac Machines
http://stackoverflow.com/questions/8402281/github-push-error-permission-denied
cd ~
ssh-keygen
cat .ssh/id_rsa.pub > .ssh/authorized_keys

Internalize a project in server
cd /opt/git/
mkdir <Project-name>
cd <Project-name>
git inti --bare

In client
git clone xxxx@xxx.xxx.xxx.xxx:/opt/git/<Project-name>
cd <Project-name>
git add *
git commit -m "Test Files"
>>git remote add <remote-name> <git-repo-URL>
git remote add orgin xxxx@xxx.xxx.xxx.xxx:/opt/git/<Project-name>
git push orgin master

Branching
git checkout -b <Branch-name>
git push <remote-name> <branch-name>
git push <remote-name> <local-branch-name>:<remote-branch-name>

List ALL Branching
git branch -a
List Remote Branching
git branch -r

Merge two branch
git checkout a (you will switch to branch a)
git merge b (this will merge all changes from branch b into branch a)
git commit -a (this will commit your changes)

List Merged Branches
git branch --merged lists the branches that have been merged into the current branch
git branch --no-merged lists the branches that have not been merged into the current branch

 

Installing ffmpeg-php with php5.4

 

yum update
yum install gcc make automake bzip2 unzip patch subversion libjpeg-devel yasm

Installing the DAG repo for ffmpeg

yum install http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm

yum install ffmpeg ffmpeg-devel ffmpeg-libpostproc
yumum install mplayer

 

In cpanel install all the needed modules

/scripts/installruby
gem install flvtool2

yum install mencoder gpac gpac-libs

Lets get ffmpeg-php

wget http://downloads.sourceforge.net/ffmpeg-php/ffmpeg-php-0.6.0.tbz2
tar xjf ffmpeg-php-0.6.0.tbz2
cd ffmpeg-php-0.6.0
sed -i 's/PIX_FMT_RGBA32/PIX_FMT_RGB32/g' ffmpeg_frame.c
phpize
./configure
make
Note: If you are running php5.4 you may need to make following change then run “make” above again:

pico ffmpeg_movie.c
in ffmpeg_movie.c:
row 311: list_entry *le; TO zend_rsrc_list_entry *le;
row 346: list_entry new_le; TO zend_rsrc_list_entry new_le;
row 360: hashkey_length+1, (void *)&new_le, sizeof(list_entry), TO hashkey_length+1, (void *)&new_le,sizeof(zend_rsrc_list_entry),

Now let’s really install everything

make test
make install
## will get a out put as below
Installing shared extensions: /usr/local/lib/php/extensions/no-debug-non-zts-20100525/

pico /usr/local/lib/php.ini
Now add following to end of file but substitute no-debug-non-zts-20100525 below for where it installed it in your “make install” command above

extension_dir = "/usr/local/lib/php/extensions/no-debug-non-zts-20100525"
extension="ffmpeg.so"

 

IFS Internal Field Separator in Bash Scripting

IFS stands for  Internal Field Separator - it's a character that separate fields. In the example you posted it is set to new line character (\n), so after setting it for will process text line by line. In that example you could change value of $IFS (to some letter that you have in your input file) and check how text will be splitted.

 

[root@ip-192-168-1-36 tmp]# for i in `cat sample.txt`; do echo $i; done
Mar 10
Mar 11
Mar 7
Mar 8
Mar 9
[root@ip-192-168-1-36 tmp]# IFS=$' '
[root@ip-192-168-1-36 tmp]# for i in `cat sample.txt`; do echo $i; done

Mar
10
Mar
11
Mar
7
Mar
8
Mar
9
[root@ip-192-168-1-36 tmp]# IFS=$'\n'
[root@ip-192-168-1-36 tmp]# for i in `cat sample.txt`; do echo $i; done
Mar 10
Mar 11
Mar 7
Mar 8
Mar 9
[root@ip-192-168-1-36 tmp]#

Installing rar in linux

for 64 bit

install unrar centos x64
#wget http://pkgs.repoforge.org/unrar/unrar-4.0.7-1.el6.rf.x86_64.rpm
#rpm -Uvh unrar-4.0.7-1.el6.rf.x86_64.rpm

install rar centos x64
#wget http://pkgs.repoforge.org/rar/rar-3.8.0-1.el6.rf.x86_64.rpm
#rpm -Uvh rar-3.8.0-1.el6.rf.x86_64.rpm

for 32 bit

install unrar centos 32
#wget http://pkgs.repoforge.org/unrar/unrar-4.0.7-1.el6.rf.i686.rpm
#rpm -Uvh unrar-4.0.7-1.el6.rf.i686.rpm

install rar centos 32

#wget http://pkgs.repoforge.org/rar/rar-3.8.0-1.el6.rf.i686.rpm

#rpm -Uvh rar-3.8.0-1.el6.rf.i686.rpm

you can also use matching OS rpm from

http://pkgs.repoforge.org/rpmforge-release/

 

Installing Amazon Command Line using PIP

Installing the repo needed for pip

cd /tmp
wget http://mirror-fpt-telecom.fpt.net/fedora/epel/6/i386/epel-release-6-8.noarch.rpm
rpm -ivh epel-release-6-8.noarch.rpm

Installing C-compiler for Pip

yum install gcc

Installing amazon cli

pip install awscli

Configure Amazon Cli

aws configrue

you need aws access key ,secret key, default region and output format.

Installing and configuring Amazon EC2 command line

Now download the Amazon API CLI tools using following command and extract them at a proper place. For this example, we are using /opt directory.

# mkdir /opt/ec2
# wget http://s3.amazonaws.com/ec2-downloads/ec2-api-tools.zip
# unzip ec2-api-tools.zip -d /tmp
# mv /tmp/ec2-api-tools-* /opt/ec2/tools
Step 3- Download Private Key and Certificate Files

Now create and download X.509 certificate (private key file and certificate file) files from your account from Security Credentials page and copy to /opt/ec2/certs/ directory.

# ls -l /opt/ec2/certs/

-rw-r--r--. 1 root root 1281 May 15 12:57 my-ec2-cert.pem
-rw-r--r--. 1 root root 1704 May 15 12:56 my-ec2-pk.pem
Step 4- Configure Environment

Install JAVA
The Amazon EC2 command line tools required Java 1.6 or later version. Make sure you have proper java installed on your system. You can install JRE or JDK , both are ok to use.
# java -version
java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) Client VM (build 25.5-b02, mixed mode)
If you don’t have Java installed your system, Use below links to install Java on your system first
Installing JAVA/JDK 8 on CentOS, RHEL and Fedora
Installing JAVA/JDK 8 on Ubuntu

Now edit ~/.bashrc file and add the following values at end of file

export EC2_BASE=/opt/ec2
export EC2_HOME=$EC2_BASE/tools
export EC2_PRIVATE_KEY=$EC2_BASE/certs/my-ec2-pk.pem
export EC2_CERT=$EC2_BASE/certs/my-ec2-cert.pem
export EC2_URL=https://ec2.xxxxxxx.amazonaws.com
export AWS_ACCOUNT_NUMBER=
export PATH=$PATH:$EC2_HOME/bin
export JAVA_HOME=/opt/jdk1.8.0_05
Now execute the following command to set environment variables

$ source ~/.bashrc

After completing all configuration, let’s run following command to quickly verify setup.

# ec2-describe-regions

REGION eu-west-1 ec2.eu-west-1.amazonaws.com
REGION sa-east-1 ec2.sa-east-1.amazonaws.com
REGION us-east-1 ec2.us-east-1.amazonaws.com
REGION ap-northeast-1 ec2.ap-northeast-1.amazonaws.com
REGION us-west-2 ec2.us-west-2.amazonaws.com
REGION us-west-1 ec2.us-west-1.amazonaws.com
REGION ap-southeast-1 ec2.ap-southeast-1.amazonaws.com
REGION ap-southeast-2 ec2.ap-southeast-2.amazonaws.com