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Operating Systems Linux CentOS Live Server Migration? Post 302376946 by Deputy Cartman on Wednesday 2nd of December 2009 06:13:13 PM
Old 12-02-2009
CentOS Live Server Migration?

Hello, everyone. I've been lurking on this forum for a while but have never needed to post asking for a bit of help until now.

Long story short, I have a test of sorts scheduled with a prospective employer, a managed web hosting company, that involves migrating a hypothetical customer from their old server to their new server, hosted with the prospective employer. I have worked with Linux for a few years now, including at two unmanaged hosting companies for about three years, so I can handle the basics and a bit of intermediate stuff without any issue.

Unfortunately, due to my past jobs offering unmanaged hosting, we would never in a million years do something like this for a customer, so I am not familiar with how to do this. I know how to move data, users, and so forth over, basically via what is mentioned here, which we also would never do, due to learning on my own time. However, the stipulation that services on the origin server not be shut down during the migration process, which entails moving services over as well, has me scratching my head, hence my request for help or a few pointers regarding live services migration.

What I know about the impending test is that it "is a standard configuration not designed to be tricky." This is for web hosting, so I assume it will have Apache, MySQL, PHP, a mail server, and other basic web hosting services running. As far as the distro, it is either going to be CentOS, which I am most familiar with, or Gentoo. The person I was e-mailing could not remember which distro it was.

Any and all assistance regarding live server migration will be greatly appreciated, because how I perform on this test will likely determine if I remain laid off in Dallas or employed in New York City.
 

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lumake(1M)						  System Administration Commands						lumake(1M)

NAME
lumake - populate a boot environment SYNOPSIS
/usr/sbin/lumake [-l error_log] [-o outfile] [-s source_BE] -n BE_name [-X] /usr/sbin/lumake [-l error_log] -t time [-o outfile] [-s source_BE] -n BE_name [-m email_address] [-X] DESCRIPTION
The lumake command is part of a suite of commands that make up the Live Upgrade feature of the Solaris operating environment. See live_upgrade(5) for a description of the Live Upgrade feature. The lumake command populates (that is, copies files to) the file systems of a specified boot environment (BE) by copying files from the corresponding file systems of the active or a source (-s) BE. Any existing data on the target BE are destroyed. All file systems on the target BE are re-created. The target BE must already exist. Use lucreate(1M) to create a new BE. The lumake command requires root privileges. OPTIONS
The lumake command has the following options: -n BE_name Name of the BE to be populated. -s source_BE The optional name of a source BE. If you omit this option, lumake uses the current BE as the source. A BE must have the status "complete" before you can copy from it. Use lustatus(1M) to determine a BE's status. -l error_log Error and status messages are sent to error_log, in addition to where they are sent in your current environment. -o outfile All command output is sent to outfile, in addition to where it is sent in your current environment. -t time Setup a batch job to populate the specified BE at a specified time. The time is given in the format specified by the at(1) man page. At any time, you can have only one Live Upgrade operation scheduled. You can use lucancel(1M) to cancel a scheduled lumake operation. -m email_address Allows you to email lumake output to a specified address upon command completion. There is no checking of email_address. You can use this option only in conjunction with -t. -X Enable XML output. Characteristics of XML are defined in DTD, in /usr/share/lib/xml/dtd/lu_cli.dtd.<num>, where <num> is the version number of the DTD file. EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. FILES
/etc/lutab list of BEs on the system /usr/share/lib/xml/dtd/lu_cli.dtd.<num> Live Upgrade DTD (see -X option) ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWluu | +-----------------------------+-----------------------------+ SEE ALSO
lu(1M), luactivate(1M), lucancel(1M), lucompare(1M), lucreate(1M), lucurr(1M), ludelete(1M), ludesc(1M), lufslist(1M), lumount(1M), lure- name(1M), lustatus(1M), luupgrade(1M), lutab(4), attributes(5), live_upgrade(5) SunOS 5.10 24 Jan 2002 lumake(1M)
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