mobile version detect with same url in nginx using proxy_pass :-

Mobile version detect with same url in nginx using proxy_pass :-

if ($http_user_agent ~* "/Mobile|Android|BlackBerry/") {

    proxy_pass    http://m.example.com$request_uri;

}

proxy_pass    http://www.example.com$request_uri;

http {

    upstream app-pc {

        server 127.0.0.1:8001;

    }

    upstream app-mobile {

        server 127.0.0.1:8002;

    }

    server {

        listen       8080;

        server_name  localhost;

        # check user agent

        if ($http_user_agent ~* '(iPhone|iPod|Opera Mini|Android.*Mobile|NetFront|PSP|BlackBerry|Windows Phone)') {

          set $ua_type "@mobile";

        }

        location / {

            # root

            if ($ua_type = "@mobile"){

                set $page_cache_path /var/www/app_pc/public;

            }

            if ($ua_type != "@mobile"){

                set $page_cache_path /var/www/app_mobile/public;

            }

            root $page_cache_path;

            # for page cache

            if (-f $request_filename) { 

                break; 

            }

            if (-f $request_filename/index.html) {

                rewrite (.*) $1/index.html break;

            }

            if (-f $request_filename.html) {

                rewrite (.*) $1.html break;

            }

            # proxy

            if ($ua_type = "@mobile"){

                proxy_pass http://app-mobile;

            }

            if ($ua_type != "@mobile"){

                proxy_pass http://app-pc;

            }

        }

    }

}

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How to connect multiple VPNs using OpenVPN on Windows 7 on the same time

How to connect multiple VPNs using OpenVPN on Windows 7 on the same time :-

you will need to create some additional TAP-WIN32 adapters if you haven't already.

If you are using OpenVPN 2.3.x or later, run addtap.bat:

C:\Program Files\TAP-Windows\bin\addtap.bat

If you are using an older version of OpenVPN, run the tapinstall command

C:\Program Files\OpenVPN\bin\tapinstall.exe

C:\Program Files (x86)\OpenVPN\bin\tapinstall.exe

(NOTE: Maybe you should open the cmd with Administrator Privileges)

The easiest way, not to mention tapinstall.exe, is to run Start > All Programs > OpenVPN > Utilities > Install > Add a new TAP vitrual ethernet adapter

Please remember to run it with administrator privileges, in other case you will just get tapinstall failed.

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Unable to send an email: 535 5.7.8 Error: authentication failed: authentication failure

Unable to send an email: 535 5.7.8 Error: authentication failed: authentication failure:-

we can be found this exception in /var/log/maillog :

Dec  4 06:06:34 servername postfix/qmgr[6334]: DA7FB101118C: from=, size=827, nrcpt=1 (queue active)

Dec  3 04:04:22 servername postfix/error[25863]: DA7FB101118C: to=, relay=none, delay=0.1, delays=0.1/0/0/0, dsn=4.7.8, status=deferred (delivery temporarily suspended: SASL authentication failed; server someexternalserver.com [203.0.113.2] said: 535 5.7.8 Error: authentication failed: authentication failure)

relayhost is configured in /etc/postfix/main.cf :

# cat /etc/postfix/main.cf | grep  "relayhost ="

relayhost = someexternalserver.com

Cause

Issues on someexternalserver.com side.

Resolution

Contact owner of someexternalserver.com to check the issue.

2.1. relayhost can be disabled by commenting it in /etc/postfix/main.cf

    # cat /etc/postfix/main.cf | grep  "relayhost ="

    #relayhost = someexternalserver.com

2.2. Restart postfix:

    # service postfix restart

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How to remove files /bin/rm: Argument list too long

How to remove files /bin/rm: Argument list too long :-

How to remove files /bin/rm: Argument list too long by using below command.

find . -mindepth 1 -iname "*.xls" -print0|xargs --no-run-if-empty --null rm -rf

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How to Flush or Delete Postfix Mail Queue

How to Flush or Delete Postfix Mail Queue:-

there are following commands to flush/delete postfix mail queue.

1. List All Emails :-

To list all mail of queue, use one of the following commands.

postqueue -p

2. Flush All Emails :-

To delete or flush all emails from Postfix mail queue using the following command.

postsuper -d ALL

3. Flush Deferred Mails Only :-

You can only delete all deferred emails only from mail queue. Use the following command to delete deferred emails from the queue.

postsuper -d ALL deferred

4. Remove Specific Email :-

If you want to remove any specific email. Use the following command to remove specific emails only. First search the ID of that email like below command

postqueue -p | grep "email@example.com"

056CB129FF0*    5513 Sun Feb 26 02:26:27  email@example.com

Now delete the mail from mail queue with id 056CB129FF0.

postsuper -d 056CB129FF0

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How to Install Apache Solr 5.1 on CentOS 6

How to Install Apache Solr 5.1 on CentOS 6 :-

following are the steps for how to install Apache Solr 5.1 on a CentOS 6 server . 

Step 1. Install Solr :-

download and install solr first.

# cd /opt/solr 

# wget http://mirror.symnds.com/software/Apache/lucene/solr/5.1.0/solr-5.1.0.tgz -O solr-5.1.0.tgz

Uncompress the file:

# tar -xzvf ./solr-5.1.0.tgz

Now the directory /opt/solr/solr-5.1.0 will contain all the Solr files. 

Step 2. Install Java :-

First, check if Java is already installed:

# which java

  If not installed, install the latest version :

# yum list available java* 

# yum install java-1.8.0-openjdk.x86_64

Verify install:

# which java 

[...] 

# java -version 

openjdk version "1.8.0_45" 

OpenJDK Runtime Environment (build 1.8.0_45-b13) 

OpenJDK 64-Bit Server VM (build 25.45-b02, mixed mode)

Step 3. Start Solr :-

Next start Solr and test instance:

# cd /opt/solr/solr-5.1.0 

# bin/solr start -noprompt

Verify Solr is running:

# ps aux | grep solr 

[...] 

# lsof -i :8983 

[...]

Step 4. Install NMAP :-

The Solr service can also be verified from a remote machine. First, install nmap if not already installed on remote machine:

# yum install nmap

Then test the Solr service from the remote machine:

# nmap -p 8983 [remote IP address] 

Starting Nmap 5.51 ( http://nmap.org ) at * EDT 

Nmap scan report for 

Host is up (0.054s latency). 

PORT STATE SERVICE 

8983/tcp open unknown 

Nmap done: 1 IP address (1 host up) scanned in 0.25 seconds

If the remote machine is unable to connect try setting up firewall rules, or disable firewall for testing:

# service iptables stop

Stopping Solr can be accomplished using:

# cd /opt/solr/solr-5.1.0 

# bin/solr stop

Step 5. Auto Start Solr :-

Finally, Solr can be setup as a service that starts when the server boots. Create the script file 

/etc/init.d/solr and add:

#!/bin/sh 

# chkconfig: 2345 95 20 

# description: Solr Server 

# Solr Server service start, stop, restart 

# @author Shay Anderson 04.15 

SOLR_DIR="/opt/solr/solr-5.1.0" 

case $1 in 

      start) 

            echo "Starting Solr..." 

            $SOLR_DIR/bin/solr start -noprompt 

            sleep 1 

            lsof -i :8983 

            ;; 

      stop) 

            echo "Stopping Solr..." 

            $SOLR_DIR/bin/solr stop 

            ;; 

      restart) 

            $0 stop 

            sleep 2 

            $0 start 

            ;; 

      status) 

            $SOLR_DIR/bin/solr status 

            ;; 

      *) 

            echo "Usage: $0 [start|stop|restart]" 

            exit 1 

            ;; 

esac 

exit 0

Save the file and set permissions:

# chmod +x /etc/init.d/solr

Now the Solr service can be started/stopped using:

# service solr start 

[...] 

# service solr stop 

[...]

Enable auto start service on server boot:

# cd /etc/init.d 

# chkconfig --add solr 

# chkconfig | grep solr

Now the Solr service will start on server boot. 

Create New Core

A new core can be created using:

# cd /opt/solr/solr-5.1.0 

# bin/solr create -c mycore

This will create the core and core directory /opt/solr/solr-5.1.0/server/solr/mycore

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How to Show All Running Processes in Linux

How to Show All Running Processes in Linux :-

How to show all running process in Linux operating systems using command line or GUI options.

Linux commands to list processes :-

following commands to display info about processes on Linux:

top command : Display and update sorted information about processes.

atop command : Advanced System & Process Monitor.

htop command : Interactive process viewer.

pgrep command : Look up or signal processes based on name and other attributes.

pstree command : Display a tree of processes.

How to list process with the ps command :-

following ps command to display all running process:

# ps -aux | less

OR

# ps aux | less

Where,

A : Select all processes

u : Select all processes on a terminal, including those of other users

x : Select processes without controlling ttys

How To See every process on the Linux system :-

Either pass -A or -e option to show all processes on your server/workstation powered by Linux:

# ps -A

# ps -e

How to see every process except those running as root :-

To negates the selection pass the -N or --deselect option to the ps command:

# ps -U root -u root -N

OR

# ps -U root -u root --deselect

How to See process run by user xyz :-

Select by process by effective user ID (EUID) or name by passing username such as xyz:

# ps -u xyz

Linux running processes with top command :-

The top program provides a dynamic real-time view of a running system. Type the top at command prompt:

# top

How to display a tree of processes :-

The pstree command shows running processes as a tree. The tree is rooted at either pid or init if pid is omitted. If a user name is specified, all process trees rooted at processes owned by that user are shown.

$ pstree

Print a process tree using ps :-

# ps -ejH

# ps axjf

How to Get info about threads using following command :-

Type the following command:

# ps -eLf

# ps axms

How to show Task: Get security info :-

Type the following command:

# ps -eo euser,ruser,suser,fuser,f,comm,label

# ps axZ

# ps -eM

How to save process snapshot to a file :-

Type the following command:

# top -b -n1 > /tmp/process.log

Or you can email result to yourself : -

# top -b -n1 | mail -s 'Process snapshot' you@example.com

How to lookup process by name :-

Use pgrep command command. It looks through the currently running processes and lists the process IDs which matches the selection criteria to screen. For example, display firefox process id:

$ pgrep firefox

Sample outputs:

3356

Following command will list the process called sshd which is owned by a user called root:

$ pgrep -u root sshd

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How to Check Postfix Version

How to Check Postfix Version :-

How to check your postfix mail server version. Basically, postfix is a open-source mail transfer agent (MTA) and an alternative for Sendmail service which provide the same function.

Following Command for check version  :

postconf -d | grep mail_version

Examples :

[root@centos ~]# postconf -d | grep mail_version

mail_version = 2.6.2

milter_macro_v = $mail_name $mail_version

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