09-29-2011
You will need a cluster for such actions.
Think about it, you upgrade and something goes wrong ?
Your service will be down during the time you are restoring backup.
With cluster and proper backup, you can safely upgrade with service being up all the time (this to some extent depends of the service itself.)
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LEARN ABOUT CENTOS
doveadm-instance
DOVEADM-INSTANCE(1) Dovecot DOVEADM-INSTANCE(1)
NAME
doveadm-instance - Manage the list of running Dovecot instances
SYNOPSIS
doveadm [-Dv] [-f formatter] instance list
doveadm [-Dv] instance remove name | base_dir
DESCRIPTION
The doveadm instance commands are used to manage the list of Dovecot instances running on the server. In most installations there is only
one Dovecot instance, but in some cases is may be useful to have more (e.g. running director proxy and backend in the same server).
Instances are added to the list automatically when Dovecot is started. Each instance is uniquely identified by its base_dir setting.
Instances can be named by setting instance_name in each instance's dovecot.conf. When an instance is named, it can be accessed easily by
giving -i instance_name command line parameter for Dovecot binaries (e.g. doveadm).
OPTIONS
Global doveadm(1) options:
-D Enables verbosity and debug messages.
-f formatter
Specifies the formatter for formatting the output. Supported formatters are:
flow prints each line with key=value pairs.
pager prints each key: value pair on its own line and separates records with form feed character (^L).
tab prints a table header followed by tab separated value lines.
table prints a table header followed by adjusted value lines.
-v Enables verbosity, including progress counter.
ARGUMENTS
name The value of an instance's instance_name setting.
base_dir
The base directory of a Dovecot instance.
COMMANDS
instance list
doveadm instance list
This command lists the seen Dovecot instances.
instance remove
doveadm instance remove name | base_dir
This command removes the specified instance.
REPORTING BUGS
Report bugs, including doveconf -n output, to the Dovecot Mailing List <dovecot@dovecot.org>. Information about reporting bugs is avail-
able at: http://dovecot.org/bugreport.html
SEE ALSO
doveadm(1)
Dovecot v2.2 2012-02-16 DOVEADM-INSTANCE(1)