Cpanel Installation

HowTo: Two way file sync between three or more servers

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I was working in a project have multiple server, just assume that more than two, all those webservers are under loadbalancer and which doesn’t having centralize storage. So one thing I can do is sync files between the servers.

The first priority to avoid unwanted process and sync the file only if any updates happen, this action will effect all the servers.

I used the tool called Lsync + Unison

Lsyncd

Source : https://code.google.com/p/lsyncd/

Lsyncd watches a local directory trees event monitor interface (inotify or fsevents). It aggregates and combines events for a few seconds and then spawns one (or more) process(es) to synchronize the changes. By default this is rsync. Lsyncd is thus a light-weight live mirror solution that is comparatively easy to install not requiring new filesystems or blockdevices and does not hamper local filesystem performance.

Unison 

Source : http://olex.openlogic.com/packages/unison

Unison is a file-synchronization tool for Unix and Windows. It allows two replicas of a collection of files and directories to be stored on different hosts (or different disks on the same host), modified separately, and then brought up to date by propagating the changes in each replica to the other. License GPLv3

Please follow the implementation steps below for all the servers, because each server should check for updates

Server1 : 192.168.1.51

Server2: 192.168.1.52

Server3: 192.168.1.53

Shared folder is same on all the server /home/syncfuser/fileupload

SSH port : 10022

Web root writable user : syncfuser

Installation

Add additional Centos repository here I used CentOS 6.4 64bit. you may get different version from the give link

http://wiki.centos.org/AdditionalResources/Repositories/RPMForge

[root@srv-51 ~]# rpm -Uvh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
 Retrieving http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
 warning: /var/tmp/rpm-tmp.iORM9p: Header V3 DSA/SHA1 Signature, key ID 6b8d79e6: NOKEY
 Preparing... ########################################### [100%]
 1:rpmforge-release ########################################### [100%]
[root@srv-51 ~]# rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt

Installing  Lsycd , unison

[root@srv-51 ~]# wget http://lsyncd.googlecode.com/files/lsyncd-2.0.6.tar.gz
[root@srv-51 ~]# tar -zxvf lsyncd-2.0.6.tar.gz
[root@srv-51 ~]# cd lsyncd-2.0.6 ; make ; make install
[root@srv-51 ~]# yum install pkgconfig lua.x86_64 lua-devel.x86_64 lua-static.x86_64 gcc unison -y
[root@srv-51 ~]# touch /var/log/lsyncd/{lsyncd,lsyncd-status}.log
[root@srv-51 ~]# vi /etc/init.d/lsyncd

 #!/bin/bash
 #
 # chkconfig: - 85 15
 # description: Lightweight inotify based sync daemon
 #
 # processname:  lsyncd
 # config:       /etc/lsyncd.conf
 # config:       /etc/sysconfig/lsyncd
 # pidfile:      /var/run/lsyncd.pid
# Source function library
 . /etc/init.d/functions
# Source networking configuration.
 . /etc/sysconfig/network
# Check that networking is up.
 [ "$NETWORKING" = "no" ] && exit 0
LSYNCD_OPTIONS="-pidfile /var/run/lsyncd.pid /etc/lsyncd.conf"
if [ -e /etc/sysconfig/lsyncd ]; then
 . /etc/sysconfig/lsyncd
 fi
RETVAL=0
prog="lsyncd"
 thelock=/var/lock/subsys/lsyncd
start() {
 [ -f /etc/lsyncd.conf ] || exit 6
 echo -n $"Starting $prog: "
 if [ $UID -ne 0 ]; then
 RETVAL=1
 failure
 else
 daemon /usr/local/bin/lsyncd $LSYNCD_OPTIONS
 RETVAL=$?
 [ $RETVAL -eq 0 ] && touch $thelock
 fi;
 echo
 return $RETVAL
 }
stop() {
 echo -n $"Stopping $prog: "
 if [ $UID -ne 0 ]; then
 RETVAL=1
 failure
 else
 killproc lsyncd
 RETVAL=$?
 [ $RETVAL -eq 0 ] && rm -f $thelock
 fi;
 echo
 return $RETVAL
 }
reload(){
 echo -n $"Reloading $prog: "
 killproc lsyncd -HUP
 RETVAL=$?
 echo
 return $RETVAL
 }
restart(){
 stop
 start
 }
condrestart(){
 [ -e $thelock ] && restart
 return 0
 }
case "$1" in
 start)
 start
 ;;
 stop)
 stop
 ;;
 restart)
 restart
 ;;
 reload)
 reload
 ;;
 condrestart)
 condrestart
 ;;
 status)
 status lsyncd
 RETVAL=$?
 ;;
 *)
 echo $"Usage: $0 {start|stop|status|restart|condrestart|reload}"
 RETVAL=1
 esac
exit $RETVAL
chmod +x /etc/init.d/lsyncd

Before start configuring lsync please make sure that password less login is enabled for all the servers.

Create a new conf file /etc/lsyncd.conf

[root@srv-51 ~]# vi /etc/lsyncd.conf
settings = {
 logfile = "/var/log/lsyncd/lsyncd.log",
 statusFile = "/var/log/lsyncd/lsyncd-status.log",
 maxDelays = 3
 }
 runUnison2 = {
 maxProcesses = 1,
 delay = 3,
 onAttrib = "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false -confirmbigdel=false /home/syncfuser/fileupload ssh://syncfuser@192.168.1.52:10022//home/syncfuser/fileupload",
 onCreate = "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false -confirmbigdel=false /home/syncfuser/fileupload ssh://syncfuser@192.168.1.52:10022//home/syncfuser/fileupload",
 onDelete = "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false -confirmbigdel=false /home/syncfuser/fileupload ssh://syncfuser@192.168.1.52:10022//home/syncfuser/fileupload",
 onModify = "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false /home/syncfuser/fileupload ssh://syncfuser@192.168.1.52:10022//home/syncfuser/fileupload",
 onMove = "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false /home/syncfuser/fileupload ssh://syncfuser@192.168.1.52:10022//home/syncfuser/fileupload",
 }
runUnison3 = {
 maxProcesses = 1,
 delay = 3,
 onAttrib = "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false /home/syncfuser/fileupload ssh://syncfuser@192.168.1.53:10022//home/syncfuser/fileupload",
 onCreate = "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false /home/syncfuser/fileupload ssh://syncfuser@192.168.1.53:10022//home/syncfuser/fileupload",
 onDelete = "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false /home/syncfuser/fileupload ssh://syncfuser@192.168.1.53:10022//home/syncfuser/fileupload",
 onModify = "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false /home/syncfuser/fileupload ssh://syncfuser@192.168.1.53:10022//home/syncfuser/fileupload",
 onMove = "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false /home/syncfuser/fileupload ssh://syncfuser@192.168.1.53:10022//home/syncfuser/fileupload",
 }
sync{ runUnison2, source="/home/syncfuser/fileupload" }
sync{ runUnison3, source="/home/syncfuser/fileupload" }

 

Please use -confirmbigdel=false if you have clear Idea about what you are doing, which will give the power to remove the file forcefully even if the directory is to be empty.

With out -confirmbigdel=false will stop syncing (crash lsync) for the scenario ( directory going to be empty) . It will protect the file from accidentally removal commad rm -rf * , if it is a server you don’t need to worry about it  because the file removal is handled by the application.
Sample logs for file syncs .

[root@srv-51 fileupload]# cat > samplefile-sv1.txt
This is the sample file from server1.
^C
tail -f /var/log/lsyncd/lsyncd.log
Fri Jun 27 18:41:44 2014 Normal: Event Delete spawns shell "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false  /home/syncfuser/fileupload ssh://syncfuser@192.168.1.53:10022//home/syncfuser/fileupload"
Fri Jun 27 18:41:44 2014 Normal: Event Delete spawns shell "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false  /home/syncfuser/fileupload ssh://syncfuser@192.168.1.51:10022//home/syncfuser/fileupload"
Contacting server...
Contacting server...
Connected [//srv-51//home/syncfuser/fileupload -> //srv-52//home/syncfuser/fileupload]
Looking for changes
  Waiting for changes from server
Reconciling changes
Connected [//srv-52//home/syncfuser/fileupload -> //srv-53//home/syncfuser/fileupload]
Looking for changes
  Waiting for changes from server
Nothing to do: replicas have been changed only in identical ways since last sync.
Fri Jun 27 18:41:44 2014 Normal: Retrying Delete on /home/syncfuser/fileupload//.unison.samplefile-sv1.txt.f629b5a5e1d6f2942bd1ec2ad54122b6.unison.tmp = 0
Fri Jun 27 18:41:44 2014 Normal: Event Create spawns shell "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false  /home/syncfuser/fileupload ssh://syncfuser@192.168.1.51:10022//home/syncfuser/fileupload"
Reconciling changes
Nothing to do: replicas have been changed only in identical ways since last sync.
Fri Jun 27 18:41:44 2014 Normal: Retrying Delete on /home/syncfuser/fileupload//.unison.samplefile-sv1.txt.f629b5a5e1d6f2942bd1ec2ad54122b6.unison.tmp = 0
Fri Jun 27 18:41:44 2014 Normal: Event Create spawns shell "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false  /home/syncfuser/fileupload ssh://syncfuser@192.168.1.53:10022//home/syncfuser/fileupload"
Contacting server...
Contacting server...
Connected [//srv-51//home/syncfuser/fileupload -> //srv-52//home/syncfuser/fileupload]
Looking for changes
  Waiting for changes from server
Reconciling changes
Nothing to do: replicas have not changed since last sync.
Fri Jun 27 18:41:44 2014 Normal: Retrying Create on /home/syncfuser/fileupload//samplefile-sv1.txt = 0
Connected [//srv-52//home/syncfuser/fileupload -> //srv-53//home/syncfuser/fileupload]
Looking for changes
  Waiting for changes from server
Reconciling changes
Nothing to do: replicas have not changed since last sync.
Fri Jun 27 18:41:44 2014 Normal: Retrying Create on /home/syncfuser/fileupload//samplefile-sv1.txt = 0
Fri Jun 27 18:41:54 2014 Normal: Event Delete spawns shell "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false  /home/syncfuser/fileupload ssh://syncfuser@192.168.1.51:10022//home/syncfuser/fileupload"
Fri Jun 27 18:41:54 2014 Normal: Event Delete spawns shell "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false  /home/syncfuser/fileupload ssh://syncfuser@192.168.1.53:10022//home/syncfuser/fileupload"
Contacting server...
Contacting server...
Connected [//srv-52//home/syncfuser/fileupload -> //srv-53//home/syncfuser/fileupload]
Connected [//srv-51//home/syncfuser/fileupload -> //srv-52//home/syncfuser/fileupload]
Looking for changes
  Waiting for changes from server
Looking for changes
  Waiting for changes from server
Reconciling changes
Reconciling changes
Nothing to do: replicas have been changed only in identical ways since last sync.
Fri Jun 27 18:41:54 2014 Normal: Retrying Delete on /home/syncfuser/fileupload//.unison.samplefile-sv1.txt.f629b5a5e1d6f2942bd1ec2ad54122b6.unison.tmp = 0
Fri Jun 27 18:41:54 2014 Normal: Event Create spawns shell "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false  /home/syncfuser/fileupload ssh://syncfuser@192.168.1.51:10022//home/syncfuser/fileupload"
Nothing to do: replicas have been changed only in identical ways since last sync.
Fri Jun 27 18:41:54 2014 Normal: Retrying Delete on /home/syncfuser/fileupload//.unison.samplefile-sv1.txt.f629b5a5e1d6f2942bd1ec2ad54122b6.unison.tmp = 0
Fri Jun 27 18:41:54 2014 Normal: Event Create spawns shell "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false  /home/syncfuser/fileupload ssh://syncfuser@192.168.1.53:10022//home/syncfuser/fileupload"
Contacting server...
Contacting server...
Connected [//srv-51//home/syncfuser/fileupload -> //srv-52//home/syncfuser/fileupload]
Connected [//srv-52//home/syncfuser/fileupload -> //srv-53//home/syncfuser/fileupload]
Looking for changes
  Waiting for changes from server
Looking for changes
Reconciling changes
Nothing to do: replicas have not changed since last sync.
Fri Jun 27 18:41:54 2014 Normal: Retrying Create on /home/syncfuser/fileupload//samplefile-sv1.txt = 0
  Waiting for changes from server
Reconciling changes
Nothing to do: replicas have not changed since last sync.
Fri Jun 27 18:41:54 2014 Normal: Retrying Create on /home/syncfuser/fileupload//samplefile-sv1.txt = 0

[root@srv-52 fileupload]# cat >> samplefile-sv1.txt
File edited from server2.
^C
Log:
Fri Jun 27 18:43:54 2014 Normal: Event Modify spawns shell "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false /home/syncfuser/fileupload ssh://syncfuser@192.168.1.53:10022//home/syncfuser/fileupload"
Fri Jun 27 18:43:54 2014 Normal: Event Modify spawns shell "export HOME=/root ; /usr/bin/unison -batch -confirmbigdel=false /home/syncfuser/fileupload ssh://syncfuser@192.168.1.51:10022//home/syncfuser/fileupload"
Contacting server...
Contacting server...
Connected [//srv-51//home/syncfuser/fileupload -> //srv-52//home/syncfuser/fileupload]
Connected [//srv-52//home/syncfuser/fileupload -> //srv-53//home/syncfuser/fileupload]
Looking for changes
Looking for changes
 Waiting for changes from server
 Waiting for changes from server
Reconciling changes
changed ----> samplefile-sv1.txt 
local : changed file modified on 2014-06-27 at 18:43:50 size 65 rw-r--r--
srv-53 : unchanged file modified on 2014-06-27 at 18:41:51 size 38 rw-r--r--
Propagating updates
UNISON 2.40.63 started propagating changes at 18:43:54.25 on 27 Jun 2014
[BGN] Updating file samplefile-sv1.txt from /home/syncfuser/fileupload to //srv-53//home/syncfuser/fileupload
Reconciling changes
changed ----> samplefile-sv1.txt 
local : changed file modified on 2014-06-27 at 18:43:50 size 65 rw-r--r--
srv-51 : unchanged file modified on 2014-06-27 at 18:41:51 size 38 rw-r--r--
Propagating updates
UNISON 2.40.63 started propagating changes at 18:43:54.25 on 27 Jun 2014
[BGN] Updating file samplefile-sv1.txt from /home/syncfuser/fileupload to //srv-51//home/syncfuser/fileupload
[END] Updating file samplefile-sv1.txt
UNISON 2.40.63 finished propagating changes at 18:43:54.25 on 27 Jun 2014
Saving synchronizer state
[END] Updating file samplefile-sv1.txt
UNISON 2.40.63 finished propagating changes at 18:43:54.25 on 27 Jun 2014
Saving synchronizer state
Synchronization complete at 18:43:54 (1 item transferred, 0 skipped, 0 failed)
Fri Jun 27 18:43:54 2014 Normal: Retrying Modify on /home/syncfuser/fileupload//samplefile-sv1.txt = 0
Synchronization complete at 18:43:54 (1 item transferred, 0 skipped, 0 failed)
Fri Jun 27 18:43:54 2014 Normal: Retrying Modify on /home/syncfuser/fileupload//samplefile-sv1.txt = 0

[root@srv-53 fileupload]# rm -rf samplefile-sv1.txt
[root@srv-53 fileupload]# ll
total 0

Log :
Connected [//srv-51//home/syncfuser/fileupload -> //srv-53//home/syncfuser/fileupload]
Connected [//srv-52//home/syncfuser/fileupload -> //srv-53//home/syncfuser/fileupload]
Looking for changes
 Waiting for changes from server
Looking for changes
Reconciling changes
deleted ----> samplefile-sv1.txt 
local : deleted
srv-51 : unchanged file modified on 2014-06-27 at 18:53:14 size 0 rw-r--r--
Propagating updates
UNISON 2.40.63 started propagating changes at 18:53:31.85 on 27 Jun 2014
[BGN] Deleting samplefile-sv1.txt from //srv-51//home/syncfuser/fileupload
 Waiting for changes from server
[END] Deleting samplefile-sv1.txt
UNISON 2.40.63 finished propagating changes at 18:53:31.85 on 27 Jun 2014
Saving synchronizer state
Reconciling changes
deleted ----> samplefile-sv1.txt 
local : deleted
srv-52 : unchanged file modified on 2014-06-27 at 18:53:14 size 0 rw-r--r--
Propagating updates
UNISON 2.40.63 started propagating changes at 18:53:31.85 on 27 Jun 2014
[BGN] Deleting samplefile-sv1.txt from //srv-52//home/syncfuser/fileupload
[END] Deleting samplefile-sv1.txt
UNISON 2.40.63 finished propagating changes at 18:53:31.85 on 27 Jun 2014
Saving synchronizer state
Synchronization complete at 18:53:31 (1 item transferred, 0 skipped, 0 failed)
Fri Jun 27 18:53:31 2014 Normal: Retrying Delete on /home/syncfuser/fileupload//samplefile-sv1.txt = 0
Synchronization complete at 18:53:31 (1 item transferred, 0 skipped, 0 failed)
Fri Jun 27 18:53:31 2014 Normal: Retrying Delete on /home/syncfuser/fileupload//samplefile-sv1.txt = 0

 

Now You have unique file in all the servers.

 

 

 

 

HowTo: Increase The Maximum Number Of Open Files / File Descriptors (FD)

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Sometimes we will get the error message is like “too many files open“, it is because of you have reached the limits of opened file, You could always try doing a ulimit -n 2048. This will only reset the limit for your current shell and the number you specify must not exceed the hard limit.

Each operating system has a different hard limit setup in a configuration file. For instance, the hard open file limit on Solaris can be set on boot from /etc/system.

[anand@planetcure ~]$ cat /proc/sys/fs/file-max
172214

This show the maxmimum number of opened files for the single user, you can also use the below commad.

# ulimit -Hn
# ulimit -Sn

We can set this as System-wide and userlevel, for Global user configuration we can use /etc/sysctl.conf file under Linux operating systems. So you can increase the maximum number of open files by setting a new value in kernel variable /proc/sys/fs/file-max as follows (login as the root):

System-wide File Descriptors (FD) Limits

# sysctl -w fs.file-max=100000

The command allows to extend the new limit as 100000. You need to append the variable “fs.file-max = 100000” in the file /etc/sysctl.conf for the permanent set. It won’t be change after the reboot.

#sysctl -p

Verify by using below command

#sysctl fs.file-max

User-level File Descriptors (FD) Limits

Some of the case we need to specify the different level of setting for the particular users. This will override the sysetm wide settings and give the new limits for the users.

To specific limits by editing /etc/security/limits.conf file, we can all so use this file for all user limits

For apache:

httpd soft nofile 1024
httpd hard nofile 2048

All user limits

* soft nofile 1024
* hard nofile 2048

Save and close the file. You have to re-login to the console to get the new value.

su httpd -c "ulimit -Hn"
su httpd -c "ulimit -Sn"

Bash: History appending for multiple sessions

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I got a requirement for listing all the command history if  multiple terminal sessions using in different region for the single user. I followed the below steps.

step1 : Create a new file with the below entries

root@appserver:# cat /etc/profile.d/bash_history.sh
function share_history {
 history -a
 history -c
 history -r
}
HISTSIZE=99999
HISTCONTROL=ignoredups
HISTTIMEFORMAT=`echo -e "33[1;34m%d/%h/%Y 33[1;31m%H:%M:%S 33[0m"`
PROMPT_COMMAND='share_history'
shopt -u histappend

Step2: activate it in run-time

root@appserver:# source /etc/profile.d/bash_history.sh

Now you can see the list of aged histories

Sample Output :

1005 26/Dec/2013 14:23:08 vi /etc/profile.d/bash_history.sh
1006 26/Dec/2013 14:23:27 source /etc/profile.d/bash_history.sh
1007 26/Dec/2013 14:23:31 history

Info: Configure Redmine on cpanel hosting account with sending and receiving emails.

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Wiki : http://en.wikipedia.org/wiki/Redmine

Redmine is a free and open source, web-based project management and bug-tracking tool. It includes a calendar and Gantt charts to aid visual representation of projects and their deadlines. It handles multiple projects. Redmine provides integrated project management features, issue tracking, and support for various version control systems.
The design of Redmine is significantly influenced by Trac, a software package with some similar features.
Redmine is written using the Ruby on Rails framework. It is cross-platform and cross-database. It is part of the Bitnami app library that provides an installer and virtual machine for ease of deployment.

Before starting installation you have to make sure that Ruby on rails is working fine in your environment, If not you can follow the installation document for more help.

Installaing Ruby on Rails with Cpanel : https://enlook.wordpress.com/2013/11/19/howto-install-ruby-on-rails-with-cpanel/

Once you have done, then start the redmine installation steps.

Login to the terminal using primary account logins.

#ssh myaccount@mydomain.com

  1. Create rails_app folder and redmine folder within it then go inside that folder
    # mkdir -p ~/rails_apps/redmine/
    # cd ~/rails_apps/redmine/
  2.  Download redmine redmine-2.3.3 or latest stable version, extract it and move the content out of it, then delete the files not being used.
    1. # wget http://files.rubyforge.vm.bytemark.co.uk/redmine/redmine-2.3.3.tar.gz
      # tar -zxvf redmine-2.3.3.tar.gz
      # mv redmine-2.3.3/* ./
      # rm -rf redmine-2.3.3/
  3. Move example files where they can be used
    # cd config
    # mv database.yml.example database.yml
    # mv configuration.yml.example configuration.yml
  4. Creating the MySQL Database/User/Password
    Login to Cpanel account, Create a database , user and grant full privilege to the new user for the particular database.
    cPanelXdatabase
  5. Modifying your database.yml file.
    # vi database.yml
    production:
    adapter: mysql
    database: redmine
    host: localhost
    username: myaccount_databaseuser
    password: newpassowd
    encoding: utf8
  6. Updating the ~/rails_apps/redmine/public/.htaccess file
    # cd ../public/
    # pwd
    1. You should see something similar to this.

    /home/myaccountuser/rails_apps/redmine/public

        Add these lines
    Options -MultiViews
    PassengerResolveSymlinksInDocumentRoot on
    #Set this to whatever environment you'll be running in
    RailsEnv production
    RackBaseURI /
    SetEnv GEM_HOME /home/myaccountuser/rails_apps/redmine/public
    
    # set to resolve avoid rails control to the folder for image resolution   
    RewriteEngine On
    RewriteCond %{REQUEST_URI} ^/images.*
    RewriteRule .* - [L]
  7. Create a subdomain eg: projects.mydomain.com
    Follow cpanel procedure to create subdomain. Subdomains
  8. Remove projects folder inside public_html and create symbolic link.
    # rm -rf ~/public_html/projects
        Creating the symlink
    # ln -s ~/rails_app/redmine/public ~/public_html/projects
  9. Updating Environment variables in ~/.bashrc file
        Add these lines to the bottom of your ~/.bashrc file
               export HPATH=$HOME
               export GEM_HOME=$HPATH/ruby/gems
               export GEM_PATH=$GEM_HOME:/lib64/ruby/gems/1.9.3
               export GEM_CACHE=$GEM_HOME/cache
               export PATH=$PATH:$HPATH/ruby/gems/bin
               export PATH=$PATH:$HPATH/ruby/gems
        after which source your .bashrc file
            # source ~/.bashrc
        You will then need to check your rails version
            rails -v && rake --version && gem -v
          You should get this message

    ruby

    Rails 4.0.1
    rake, version 0.9.2.2
    1.8.23
  10. Running bundle install
    # cd ~/rails_apps/redmine/
    # bundle install
    # rake generate_session_store
  11. Running generate_session_store or generate_secret_token
    1. # rake generate_session_store
        If you get an error saying that command is deprecated, run this command instead;
     # rake generate_secret_token
  12. Start the site session
    # rake db:migrate RAILS_ENV=production
  13. Configuring outgoing emailsUpdate the setting in configuration.yml
    default:
     email_delivery:
     delivery_method: :smtp
     smtp_settings:
     address: localhost
     port: 25
     domain: mydomain.com
     authentication: :none
    enable_starttls_auto: false

    Now the redmine have capable to send emails using exim install in the cpanel server.

  14. Configuring Incomming emails for IMAPCreate a cron job for the script to get continuous email feaching
    cPanelX

    For the first this script must execute from the terminal, so it will display error if any.

    /usr/bin/rake -f /home1/innovat4/rails_apps/redmine/Rakefile --silent redmine:email:receive_imap RAILS_ENV="production" port=143 host=mydomain.com username=projects@mydomain.com password=myemailpassword

    For more help follow the official link http://www.redmine.org/projects/redmine/wiki/RedmineReceivingEmails#Enabling-unknown-users-to-create-issues-by-email

Note : Each configuration required rails environment reboot for that you can follow the simple way.

# touch ~/rails_app/redmine/tmp/reboot.txt

Howto: Install Ruby on Rails with Cpanel

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Installing Ruby on Rails on cPanel

Start the installation steps with root privileged or sudo user or you have to submit a tickte to your hosting provider for enabling Ruby on rails in you hosting account.

For detailed information about RubyGems: commands and system, read their User Guide Manuals at: www.rubygems.org/

– To install Ruby on Rails:

SSH to the server and run this command:

  • /scripts/installruby

If LIBSAFE is installed on your server, you need to add the directive /usr/bin/ruby to the exception list to prevent buffer overflow errors. SSH to the server and run this command:

  • echo “/usr/bin/ruby” >> /etc/libsafe.exclude

The local path to the binary package is:
/usr/bin/gem

To check on the current version installed on your server:

  • /usr/bin/gem -v

To list all installed gems:

  • /usr/bin/gem -l

– To uninstall Ruby on Rails:

  1. List all the gems installed on your server and remove them all using the following command:
    • /usr/bin/gem uninstall NAME_OF_GEM

    The cPanel/WHM, by default, installs the following Gems:
    rails, mongrel, fastthread, actionmailer, actionpack, activerecord, activeresource, activesupport, cgi_multipart_eof_fix, daemons, gem_plugin, rake. For example, to uninstall the Gem: rails, we’ll run this command:

    • /usr/bin/gem uninstall rails

    Sample output:
    Successfully uninstalled rails version 0.1.6

  2. Remove Gem directories and the binary package using the following commands (in that order):
    • /bin/rm -rf /usr/lib/ruby
    • /bin/rm -rf /home/cprubygemsbuild
    • /bin/rm -fv /root/.gem
    • /bin/rm -fv /usr/bin/gem
  3. Remove all ruby directories added to a client’s root directory. The local path is: /home/USER/ruby/
  4. Restart the cPanel (un-necessary but do it any way)
  • /sbin/service cpanel restart

 

Info: NFS Server&Client Setup

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Server Side

NFS share with read/write privilege for the specified UID and GID, So even root will denied to write or read in that particular mount point and completly secure from everything.

Install required packages of  NFS server.

apt-get install nfs-kernel-server nfs-common portmap

After the installation of NFS server edit /etc/exports fileand add a line as follows.

/mnt/nfs      192.168.0.0/24(rw,sync,anonuid=106,anongid=114,no_subtree_check)
     ↓           ↓                            ↓
NFSsharepath | network | Options(Here we need to set user id and group id of tomcat user)

Restart nfs server after making necessary changes in  the exports file.

#service nfs-kernel restart

Client side Linux

Install nfs client packages on NFS client machine. Mount nfs share in the client machine.

apt-get install portmap nfs-common

Make the following entry in /etc/fstab/

192.168.1.175:/mnt/nfs /home/nfs   nfs rsize=8192,wsize=8192,timeo=14,intr
           ↓                        ↓         ↓
Network share details          Mount point   Filesystem

Client Side Windows

Install nfs services for windows through control panel add or remove windows component wizard.

Edit Windows registery and make changes as follows  in the registery.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ClientForNFS \CurrentVersion\Default

1, Create two DWORD values namely AnonymousUid and AnonymousGid
2, Set these values to the UID and GID as set in the  NFS server for tomcat user (Eg:-106,114)
3, Restart NFS service.

Go to all programs- Administrative tools- Services for network filesystem and Start service of ClientForNFS.
Select properties of clientfornfs and set permissions as per the requirement. (Eg:- Read&write permission for the

Howto : Install yum after installing OS on centos

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Yum  is a awesome tool written in python used to install packages in redhat flavours. It have ability to choose dependency packages as it own from the repository needed by the installing packages. If you missed to find yum in your server, follow the below steps to install

you can get the packages from here ftp://rpmfind.net/linux/centos/6.4/os/x86_64/Packages/ 

Use wget to download these pacakages.

Package list:

gpgme-1.1.8-3.el6.x86_64.rpm
pygpgme-0.1-18.20090824bzr68.el6.x86_64.rpm
python-iniparse-0.3.1-2.1.el6.noarch.rpm
python-pycurl-7.19.0-8.el6.x86_64.rpm
python-urlgrabber-3.9.1-8.el6.noarch.rpm
rpm-4.8.0-32.el6.x86_64.rpm
rpm-python-4.8.0-32.el6.x86_64.rpm
yum-3.2.29-40.el6.centos.noarch.rpm
yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm

upgragde rpm to latest version to avoid package confilct error follow the below switchs

 [root@anand ~]# cd /root/installer/
[root@anand installer]# rpm -ivh --replacefiles rpm-4.8.0-32.el6.x86_64.rpm
 warning: rpm-4.8.0-32.el6.x86_64.rpm: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY
 Preparing... ########################################### [100%]
        1:rpm ########################################### [100%]
[root@anand installer]# mv rpm-4.8.0-32.el6.x86_64.rpm ../.
[root@anand installer]# rpm -ivh *
 warning: gpgme-1.1.8-3.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID c105b9de: NOKEY
 Preparing...                         ########################################### [100%]
 1:yum-metadata-parser                ########################################### [ 11%]
 2:rpm-python                         ########################################### [ 22%]
 3:python-pycurl                      ########################################### [ 33%]
 4:python-urlgrabber                  ########################################### [ 44%]
 5:python-iniparse                    ########################################### [ 56%]
 6:gpgme                              ########################################### [ 67%]
 7:pygpgme                            ########################################### [ 78%]
 8:yum-plugin-fastestmirro            ########################################### [ 89%]
 9:yum                                ########################################### [100%]

Now you can create a package repository as your own. floks 🙂