[CentOS] Re: help required

Scott Silva ssilva at sgvwater.com
Thu Oct 16 21:32:05 UTC 2008

on 10-16-2008 2:03 PM fabian dacunha spake the following:
> Dear ALl,
> I have the following live setup .
> Centos 5.1 running as a Mail and DNS server with the following software
> Sendmail ver
> MailScanner ver
> squirrel mail
> clam av
> spamassassin
> mailwatch
> we have about 250 mail users all with no shell and every thing is working
> perfectly fine
> now i wd like  to know the following .
> 1) if i have a copy of my /etc/passwd file and the /etc/skel/shadow file
> and if my current HDD crashes ..
> now if i make a new centos server with all the above software and jus copy
> the password n shadow file in the right directories will all the users
> able to login into the system as before.
> or is anything more required to be done.
> To explain more clearly if my current hdd crashes i can get up a new
> centos machine but creating all the 250 + users wd be a big problem
> specially the passwords.
It would also depend on how you backed up the system. In absence of a valid
passwd file, the files only have UID and GID numbers to identify them. If you
preserve this info in your backups, and also your passwd, shadow, group, and
gshadow files, you could hobble something together. But there are many other
things you need backed up.
> 2) i would like to also know about MX records
> i mean DNS server having MX with same priority n MX with different priority
> i right now have a primary n secondary mail server that is dns server with
> different MX records and its workin fine
> if i have 2 servers with same MX priority do i need to create the same
> users on both my centos servers so tht if one server fails othe one is
> operational . i do presume the above is correct or is there any other way
You usually have your backup MX just hold the mail and forward it to the
primary when it comes back up. To have a second server become operational if
the first fails is not just about backups, it is about HA (high availability).
There is more info on HA on the Linux HA website

> apprecite your help
No worries!

MailScanner is like deodorant...
You hope everybody uses it, and
you notice quickly if they don't!!!!

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