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Posted to user@cassandra.apache.org by "@Nandan@" <na...@gmail.com> on 2017/11/06 14:12:55 UTC

Reg :- Multiple Node Cluster set up in Virtual Box

Hi Users ,
 Just seeking some perfect guidelines to set up multi-node cluster  single
Data Center in single host machine.
I am currently using windows 10 as host machine and installed Oracle
virtual box in which I created 4 virtual machines and all had Ubuntu 16.04
I would like to configure a flexible robust no SPOF  data center.
So please let me know how do I start and what steps, I have to follow to
configure this multi node cluster?
My goal is to create 4 node cluster now and later based on learning
experiences I will remove 1 node and add 2 more nodes to check everything
should be working perfectly.

Just hope to get some step by step guidelines from all of you.

Thanks in advance and best regards,
Nandan Priyadarshi

Re: Reg :- Multiple Node Cluster set up in Virtual Box

Posted by "@Nandan@" <na...@gmail.com>.
Hi Users,
I successfully configured 2 Nodes Cluster , but when I configured 3rd Node
and try to join them , then 3rd node is not able to join Cluster and I am
getting below message. Please correct me in case of I am wrong at some
place.

> WARN  [GossipStage:1] 2017-11-07 17:01:42,706 TokenMetadata.java:215 -
> Token -2625048720051242117 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,707 TokenMetadata.java:215 -
> Token 2046352110807728035 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,708 TokenMetadata.java:215 -
> Token 6738112847220178646 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,710 TokenMetadata.java:215 -
> Token 5278402616817535783 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,710 TokenMetadata.java:215 -
> Token -4301762166942209316 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,711 TokenMetadata.java:215 -
> Token -5795150382485882189 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,711 TokenMetadata.java:215 -
> Token -7650474240486110510 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,712 TokenMetadata.java:215 -
> Token -7529017452803179703 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,713 TokenMetadata.java:215 -
> Token -6321052415922186365 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,713 TokenMetadata.java:215 -
> Token 505028918401730880 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,714 TokenMetadata.java:215 -
> Token -6468981120406928540 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,714 TokenMetadata.java:215 -
> Token -7886589494812723279 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,715 TokenMetadata.java:215 -
> Token 6159957549175666279 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,715 TokenMetadata.java:215 -
> Token 1371713730179023942 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,716 TokenMetadata.java:215 -
> Token 3849374212689985831 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,717 TokenMetadata.java:215 -
> Token -9130845474615238557 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,717 TokenMetadata.java:215 -
> Token -2166821314373815731 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,718 TokenMetadata.java:215 -
> Token 8172072992908340093 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,719 TokenMetadata.java:215 -
> Token 5862934089465703397 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,719 TokenMetadata.java:215 -
> Token 8683259820133858856 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,720 TokenMetadata.java:215 -
> Token -6722468819050104438 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,720 TokenMetadata.java:215 -
> Token 390606262920645821 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,721 TokenMetadata.java:215 -
> Token -2191770340916232589 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,721 TokenMetadata.java:215 -
> Token -2315498798364455538 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,722 TokenMetadata.java:215 -
> Token -4289328221922359195 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,722 TokenMetadata.java:215 -
> Token -3989195857321645521 changing ownership from /172.16.51.160 to /
> 172.16.51.185
> WARN  [GossipStage:1] 2017-11-07 17:01:42,723 TokenMetadata.java:215 -
> Token -6852043742105779264 changing ownership from /172.16.51.160 to /
> 172.16.51.185


Thanks and Best Regards,
Nandan


On Tue, Nov 7, 2017 at 12:48 PM, @Nandan@ <na...@gmail.com>
wrote:

> Hi All,
>
> Thanks for sharing all information.
> I am starting to work on this.
> Now Problem which I am getting right now is:-
> 1) How to select Network for Virtual Machine by which I can able to get
> different IP for different Virtual Box?
> 2) As I am using WIFI for HOST machine which is Windows 10, so is there
> any internal configuration required or I need to select specific Network
> Adapter into Virtual Boxs by which  I will get IP1,IP2,IP3 for
> node1,node2,node3 respectively.
>
> Please give me some ideas.
> Thanks in advance,
> Nandan Priyadarshi
>
>
> On Tue, Nov 7, 2017 at 8:28 AM, James Briggs <james.briggs@yahoo.com.
> invalid> wrote:
>
>> Nandan: The original Datastax training classes (when it was still called
>> Riptano)
>> used 3 virtualbox Debian instances to setup a Cassandra cluster.
>>
>> Thanks, James Briggs.
>> --
>> Cassandra/MySQL DBA. Available in San Jose area or remote.
>> cass_top: https://github.com/jamesbriggs/cassandra-top
>>
>>
>> ------------------------------
>> *From:* kurt greaves <ku...@instaclustr.com>
>> *To:* User <us...@cassandra.apache.org>
>> *Sent:* Monday, November 6, 2017 3:08 PM
>> *Subject:* Re: Reg :- Multiple Node Cluster set up in Virtual Box
>>
>> Worth keeping in mind that in 3.6 onwards nodes will not start unless
>> they can contact a seed. Not quite SPOF but still problematic.
>> CASSANDRA-13851 <https://issues.apache.org/jira/browse/CASSANDRA-13851>​
>>
>>
>>
>

RE: Reg :- Multiple Node Cluster set up in Virtual Box

Posted by Kyrylo Lebediev <Ky...@epam.com>.
Nandan,

There are several options available how this can be done.

For example, you may configure 2 network adapters per each VM:
1) NAT: in order the VM to have access to the Internet
2) Host-only Adapter - for internode communication setup (listen_address, rpc_address). Static IP configuration should be used for these interfaces.

Regards,
Kyrill

From: @Nandan@ [mailto:nandanpriyadarshi298@gmail.com]
Sent: Tuesday, November 7, 2017 6:49 AM
To: user <us...@cassandra.apache.org>
Subject: Re: Reg :- Multiple Node Cluster set up in Virtual Box

Hi All,

Thanks for sharing all information.
I am starting to work on this.
Now Problem which I am getting right now is:-
1) How to select Network for Virtual Machine by which I can able to get different IP for different Virtual Box?
2) As I am using WIFI for HOST machine which is Windows 10, so is there any internal configuration required or I need to select specific Network Adapter into Virtual Boxs by which  I will get IP1,IP2,IP3 for node1,node2,node3 respectively.

Please give me some ideas.
Thanks in advance,
Nandan Priyadarshi


On Tue, Nov 7, 2017 at 8:28 AM, James Briggs <ja...@yahoo.com.invalid>> wrote:
Nandan: The original Datastax training classes (when it was still called Riptano)
used 3 virtualbox Debian instances to setup a Cassandra cluster.

Thanks, James Briggs.
--
Cassandra/MySQL DBA. Available in San Jose area or remote.
cass_top: https://github.com/jamesbriggs/cassandra-top

________________________________
From: kurt greaves <ku...@instaclustr.com>>
To: User <us...@cassandra.apache.org>>
Sent: Monday, November 6, 2017 3:08 PM
Subject: Re: Reg :- Multiple Node Cluster set up in Virtual Box

Worth keeping in mind that in 3.6 onwards nodes will not start unless they can contact a seed. Not quite SPOF but still problematic. CASSANDRA-13851<https://issues.apache.org/jira/browse/CASSANDRA-13851>​



Re: Reg :- Multiple Node Cluster set up in Virtual Box

Posted by "@Nandan@" <na...@gmail.com>.
Hi All,

Thanks for sharing all information.
I am starting to work on this.
Now Problem which I am getting right now is:-
1) How to select Network for Virtual Machine by which I can able to get
different IP for different Virtual Box?
2) As I am using WIFI for HOST machine which is Windows 10, so is there any
internal configuration required or I need to select specific Network
Adapter into Virtual Boxs by which  I will get IP1,IP2,IP3 for
node1,node2,node3 respectively.

Please give me some ideas.
Thanks in advance,
Nandan Priyadarshi


On Tue, Nov 7, 2017 at 8:28 AM, James Briggs <james.briggs@yahoo.com.invalid
> wrote:

> Nandan: The original Datastax training classes (when it was still called
> Riptano)
> used 3 virtualbox Debian instances to setup a Cassandra cluster.
>
> Thanks, James Briggs.
> --
> Cassandra/MySQL DBA. Available in San Jose area or remote.
> cass_top: https://github.com/jamesbriggs/cassandra-top
>
>
> ------------------------------
> *From:* kurt greaves <ku...@instaclustr.com>
> *To:* User <us...@cassandra.apache.org>
> *Sent:* Monday, November 6, 2017 3:08 PM
> *Subject:* Re: Reg :- Multiple Node Cluster set up in Virtual Box
>
> Worth keeping in mind that in 3.6 onwards nodes will not start unless they
> can contact a seed. Not quite SPOF but still problematic. CASSANDRA-13851
> <https://issues.apache.org/jira/browse/CASSANDRA-13851>​
>
>
>

Re: Reg :- Multiple Node Cluster set up in Virtual Box

Posted by James Briggs <ja...@yahoo.com.INVALID>.
Nandan: The original Datastax training classes (when it was still called Riptano)
used 3 virtualbox Debian instances to setup a Cassandra cluster. Thanks, James Briggs.
--
Cassandra/MySQL DBA. Available in San Jose area or remote.
cass_top: https://github.com/jamesbriggs/cassandra-top

      From: kurt greaves <ku...@instaclustr.com>
 To: User <us...@cassandra.apache.org> 
 Sent: Monday, November 6, 2017 3:08 PM
 Subject: Re: Reg :- Multiple Node Cluster set up in Virtual Box
   
Worth keeping in mind that in 3.6 onwards nodes will not start unless they can contact a seed. Not quite SPOF but still problematic. CASSANDRA-13851​

   

Re: Reg :- Multiple Node Cluster set up in Virtual Box

Posted by kurt greaves <ku...@instaclustr.com>.
Worth keeping in mind that in 3.6 onwards nodes will not start unless they
can contact a seed. Not quite SPOF but still problematic. CASSANDRA-13851
<https://issues.apache.org/jira/browse/CASSANDRA-13851>​

Re: Reg :- Multiple Node Cluster set up in Virtual Box

Posted by Jeff Jirsa <jj...@gmail.com>.

> On Nov 6, 2017, at 6:52 AM, @Nandan@ <na...@gmail.com> wrote:
> 
> Hi Jeff,
> Thanks for you suggestion.
> I have few questions here. 
> 1) It is fine to set up first node and put node1 ip as seed , and then I have to follow to set up node 2,3,4 respectively with same seed node as node1 's ip address. but this will also comes as SPOF as if node1 will close for some time being.. 

Once the cluster is up you can change the seeds. The seeds are not a SPOF for a running cluster - they’re used the first time a node joins the ring (and for some other stuff you can ignore for now), as long as the cluster isn’t growing seeds don’t matter very much.



> 2) is it possible that ,after cluster set up with node1 's IP as seed and cluster name as "ABC Cluster" and later I can change seed nodes like to add node3 and node4 IP address in all 4 nodes. 

Yes, you can change seeds later. You can’t change the cluster name, though.

> 3) if it is possible then , are there nay chances that cluster may get disturbed due to changing seeds. 

Not really, people tend to think seeds are more important than they are. You want them to be the same, but if they’re different across nodes for a while it’s unlikely to hurt much. 

> Please clarify these doubts. 
> 
> 
>> On Nov 6, 2017 10:44 PM, "Jeff Jirsa" <jj...@gmail.com> wrote:
>> Looks like official docs for first-time-setup are pretty lacking.
>> 
>> One node at a time:
>> - Install the deb package: http://cassandra.apache.org/doc/latest/getting_started/installing.html 
>> - Then configure - http://cassandra.apache.org/doc/latest/getting_started/configuring.html
>>   - Pick a cluster name
>>   - Set the listen_address (and maybe broadcast_address)
>>   - Put the IP of the first node as the seed.
>> - Start the node
>> - Wait 2 minutes and then proceed to the next one.
>> 
>> 
>> 
>>  
>> 
>>> On Mon, Nov 6, 2017 at 6:33 AM, @Nandan@ <na...@gmail.com> wrote:
>>> Hi Varun ,
>>> I tried CCM , but as for practice and for deep learning , finally I understood that CCM is not a good way to go along.
>>> Like my goal is to learn about configuration aspects as well as to know in details about administration parts. 
>>> So I am trying to do configure all 4 virtual boxs as 4 nodes. 
>>> Thanks for reply. Hope we will work on this .
>>> 
>>> 
>>> Thanks,
>>> Nandan Priyadarshi
>>> 
>>>> On Nov 6, 2017 10:29 PM, "Varun Barala" <va...@gmail.com> wrote:
>>>> you can try CCM
>>>> https://academy.datastax.com/planet-cassandra/getting-started-with-ccm-cassandra-cluster-manager
>>>> 
>>>> Thanks
>>>> 
>>>>> On Mon, Nov 6, 2017 at 10:12 PM, @Nandan@ <na...@gmail.com> wrote:
>>>>> Hi Users ,
>>>>>  Just seeking some perfect guidelines to set up multi-node cluster  single Data Center in single host machine. 
>>>>> I am currently using windows 10 as host machine and installed Oracle virtual box in which I created 4 virtual machines and all had Ubuntu 16.04 
>>>>> I would like to configure a flexible robust no SPOF  data center.
>>>>> So please let me know how do I start and what steps, I have to follow to configure this multi node cluster?
>>>>> My goal is to create 4 node cluster now and later based on learning experiences I will remove 1 node and add 2 more nodes to check everything should be working perfectly.
>>>>> 
>>>>> Just hope to get some step by step guidelines from all of you.
>>>>> 
>>>>> Thanks in advance and best regards,
>>>>> Nandan Priyadarshi 
>>>> 
>> 

Re: Reg :- Multiple Node Cluster set up in Virtual Box

Posted by "@Nandan@" <na...@gmail.com>.
Hi Jeff,
Thanks for you suggestion.
I have few questions here.
1) It is fine to set up first node and put node1 ip as seed , and then I
have to follow to set up node 2,3,4 respectively with same seed node as
node1 's ip address. but this will also comes as SPOF as if node1 will
close for some time being..
2) is it possible that ,after cluster set up with node1 's IP as seed and
cluster name as "ABC Cluster" and later I can change seed nodes like to add
node3 and node4 IP address in all 4 nodes.
3) if it is possible then , are there nay chances that cluster may get
disturbed due to changing seeds.
Please clarify these doubts.

Thanks and Best Regards,
Nandan Priyadarshi


On Nov 6, 2017 10:44 PM, "Jeff Jirsa" <jj...@gmail.com> wrote:

> Looks like official docs for first-time-setup are pretty lacking.
>
> One node at a time:
> - Install the deb package: http://cassandra.apache.org/doc/latest/getting_
> started/installing.html
> - Then configure - http://cassandra.apache.org/doc/latest/getting_started/
> configuring.html
>   - Pick a cluster name
>   - Set the listen_address (and maybe broadcast_address)
>   - Put the IP of the first node as the seed.
> - Start the node
> - Wait 2 minutes and then proceed to the next one.
>
>
>
>
>
> On Mon, Nov 6, 2017 at 6:33 AM, @Nandan@ <na...@gmail.com>
> wrote:
>
>> Hi Varun ,
>> I tried CCM , but as for practice and for deep learning , finally I
>> understood that CCM is not a good way to go along.
>> Like my goal is to learn about configuration aspects as well as to know
>> in details about administration parts.
>> So I am trying to do configure all 4 virtual boxs as 4 nodes.
>> Thanks for reply. Hope we will work on this .
>>
>>
>> Thanks,
>> Nandan Priyadarshi
>>
>> On Nov 6, 2017 10:29 PM, "Varun Barala" <va...@gmail.com> wrote:
>>
>>> you can try *CCM*
>>> https://academy.datastax.com/planet-cassandra/getting-starte
>>> d-with-ccm-cassandra-cluster-manager
>>>
>>> Thanks
>>>
>>> On Mon, Nov 6, 2017 at 10:12 PM, @Nandan@ <nandanpriyadarshi298@gmail.co
>>> m> wrote:
>>>
>>>> Hi Users ,
>>>>  Just seeking some perfect guidelines to set up multi-node cluster
>>>> single Data Center in single host machine.
>>>> I am currently using windows 10 as host machine and installed Oracle
>>>> virtual box in which I created 4 virtual machines and all had Ubuntu 16.04
>>>> I would like to configure a flexible robust no SPOF  data center.
>>>> So please let me know how do I start and what steps, I have to follow
>>>> to configure this multi node cluster?
>>>> My goal is to create 4 node cluster now and later based on learning
>>>> experiences I will remove 1 node and add 2 more nodes to check everything
>>>> should be working perfectly.
>>>>
>>>> Just hope to get some step by step guidelines from all of you.
>>>>
>>>> Thanks in advance and best regards,
>>>> Nandan Priyadarshi
>>>>
>>>
>>>
>

Re: Reg :- Multiple Node Cluster set up in Virtual Box

Posted by Jeff Jirsa <jj...@gmail.com>.
Looks like official docs for first-time-setup are pretty lacking.

One node at a time:
- Install the deb package:
http://cassandra.apache.org/doc/latest/getting_started/installing.html
- Then configure -
http://cassandra.apache.org/doc/latest/getting_started/configuring.html
  - Pick a cluster name
  - Set the listen_address (and maybe broadcast_address)
  - Put the IP of the first node as the seed.
- Start the node
- Wait 2 minutes and then proceed to the next one.





On Mon, Nov 6, 2017 at 6:33 AM, @Nandan@ <na...@gmail.com>
wrote:

> Hi Varun ,
> I tried CCM , but as for practice and for deep learning , finally I
> understood that CCM is not a good way to go along.
> Like my goal is to learn about configuration aspects as well as to know in
> details about administration parts.
> So I am trying to do configure all 4 virtual boxs as 4 nodes.
> Thanks for reply. Hope we will work on this .
>
>
> Thanks,
> Nandan Priyadarshi
>
> On Nov 6, 2017 10:29 PM, "Varun Barala" <va...@gmail.com> wrote:
>
>> you can try *CCM*
>> https://academy.datastax.com/planet-cassandra/getting-starte
>> d-with-ccm-cassandra-cluster-manager
>>
>> Thanks
>>
>> On Mon, Nov 6, 2017 at 10:12 PM, @Nandan@ <nandanpriyadarshi298@gmail.com
>> > wrote:
>>
>>> Hi Users ,
>>>  Just seeking some perfect guidelines to set up multi-node cluster
>>> single Data Center in single host machine.
>>> I am currently using windows 10 as host machine and installed Oracle
>>> virtual box in which I created 4 virtual machines and all had Ubuntu 16.04
>>> I would like to configure a flexible robust no SPOF  data center.
>>> So please let me know how do I start and what steps, I have to follow to
>>> configure this multi node cluster?
>>> My goal is to create 4 node cluster now and later based on learning
>>> experiences I will remove 1 node and add 2 more nodes to check everything
>>> should be working perfectly.
>>>
>>> Just hope to get some step by step guidelines from all of you.
>>>
>>> Thanks in advance and best regards,
>>> Nandan Priyadarshi
>>>
>>
>>

Re: Reg :- Multiple Node Cluster set up in Virtual Box

Posted by "@Nandan@" <na...@gmail.com>.
Hi Varun ,
I tried CCM , but as for practice and for deep learning , finally I
understood that CCM is not a good way to go along.
Like my goal is to learn about configuration aspects as well as to know in
details about administration parts.
So I am trying to do configure all 4 virtual boxs as 4 nodes.
Thanks for reply. Hope we will work on this .


Thanks,
Nandan Priyadarshi

On Nov 6, 2017 10:29 PM, "Varun Barala" <va...@gmail.com> wrote:

> you can try *CCM*
> https://academy.datastax.com/planet-cassandra/getting-
> started-with-ccm-cassandra-cluster-manager
>
> Thanks
>
> On Mon, Nov 6, 2017 at 10:12 PM, @Nandan@ <na...@gmail.com>
> wrote:
>
>> Hi Users ,
>>  Just seeking some perfect guidelines to set up multi-node cluster
>> single Data Center in single host machine.
>> I am currently using windows 10 as host machine and installed Oracle
>> virtual box in which I created 4 virtual machines and all had Ubuntu 16.04
>> I would like to configure a flexible robust no SPOF  data center.
>> So please let me know how do I start and what steps, I have to follow to
>> configure this multi node cluster?
>> My goal is to create 4 node cluster now and later based on learning
>> experiences I will remove 1 node and add 2 more nodes to check everything
>> should be working perfectly.
>>
>> Just hope to get some step by step guidelines from all of you.
>>
>> Thanks in advance and best regards,
>> Nandan Priyadarshi
>>
>
>

Re: Reg :- Multiple Node Cluster set up in Virtual Box

Posted by Varun Barala <va...@gmail.com>.
you can try *CCM*
https://academy.datastax.com/planet-cassandra/getting-started-with-ccm-cassandra-cluster-manager

Thanks

On Mon, Nov 6, 2017 at 10:12 PM, @Nandan@ <na...@gmail.com>
wrote:

> Hi Users ,
>  Just seeking some perfect guidelines to set up multi-node cluster  single
> Data Center in single host machine.
> I am currently using windows 10 as host machine and installed Oracle
> virtual box in which I created 4 virtual machines and all had Ubuntu 16.04
> I would like to configure a flexible robust no SPOF  data center.
> So please let me know how do I start and what steps, I have to follow to
> configure this multi node cluster?
> My goal is to create 4 node cluster now and later based on learning
> experiences I will remove 1 node and add 2 more nodes to check everything
> should be working perfectly.
>
> Just hope to get some step by step guidelines from all of you.
>
> Thanks in advance and best regards,
> Nandan Priyadarshi
>