Tuesday, February 18, 2014

Migrating Redhat Linux Servers to Different Location

www.unixbabuforum.inI am looking for the process for migrating the Linux servers from one Data Center to another Data Center. 

What all needs to be considered before and after the migration process and any per-requisites that we need to look at? 

www.unixbabuforum.inI think your question is too vague, it depends on the size of your 
organization, how applications interact with each other and how information 
is shared among applications/servers, and a few dozen items more, do you 
plan to have a parallel environment or not, if not, well, I hope you have 
really good backups of both data and OS (users and settings) and excellent 
documentation on how applications interact with each other. 

Are you talking about a third party collocation facility for your servers? 
Then you would have know what the support policies are, response time to 
incidents/calls, what kind of backup media the new location accepts and how 
would they handle it or would you have to restore over the network? 

Most migrations I've participated, involving dozens of servers, we take the 
application down, make two good backups, transfer the backups to the new 
location, restore the application and its data to the new location, we 
bring the application up , after the business approves the new environment, 
each application has different constrains and cycles, for example we let at 
least 1 pay cycle happen for HR related apps, etc... then we tear the old 
one down. In one particular situation we had to migrate an application back 
to its original location because its dependencies on other servers that 
could not be migrated at that time, but in my cases, we were able to 
establish communication across the datacenters, your case might be 
different. 

I would make a detailed list of every step that you plan to take to perform 
the migration and verify with your current and future locations that they 
agree with that, don't assume anything always verify with them your plans 
make sense, for example is what kind of media you plan to use to restore 
the backups, are you relying on their hardware or yours, access to the 
datacenter, do they need to receive the media in one location, then process 
it before it enters the datacenter? etc... 

www.unixbabuforum.in Useful links for you to read and get some information about the process : 

1-http://linuxdatacenter.blogspot.com/2010/04/how-to-migrate-linux-between-different.html 

2-http://www.google.com/url?sa=t&rct=j&q=&am p;esrc=s&source=web&cd=1&cad=rja&ve d=0CCMQFjAA&url=http%3A%2F%2Fwww.infosys.com%2F consulting%2Finformation-management%2Fwhite-papers%2FDocuments%2Fdata-center-migration.pdf&ei=P__xUoP3NM_bsga874D4AQ&us g=AFQjCNGLhaCHgkLZ9__LkNHT7oNtwqruLQ&bvm=bv.607 99247,d.Yms 

3-http://www.tldp.org/LDP/lame/LAME/linux-admin-made-easy/server-migration.html 

4-http://www.howtoforge.com/back_up_restore_harddriv es_partitions_with_ghost4linux 

5-http://articles.slicehost.com/2011/2/4/migrating-a-linux-server-from-the-command-line-running-the-sync 


www.unixbabuforum.inPlease check the selinux settings. 

#getsebool -a|grep ftp 

This command show the selinux permission for ftp. In that you choose home 
dir option on. 

#setsebool home_dir on 

And also check other optiin also. 

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