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Full Discussion: Does rsync check and ignore files that already exist?
Top Forums UNIX for Dummies Questions & Answers Does rsync check and ignore files that already exist? Post 302954109 by newbie_01 on Friday 4th of September 2015 09:58:16 AM
Old 09-04-2015
Does rsync check and ignore files that already exist?
Hi,

We have two (2) servers named primary and standby. There is a directory named /db01/archive that we need to keep in-sync.

Files get transferred from primary and standby. Sometimes when we do a failover or when there is a network issue, some files fail to get transferred.

I want to use rsync to sync the files between the primary and the standby. Does rsync checks and ignores files that already exist on each server or does it check if a file has been modified, is therefore newer and then copy it over?

For example, if file01 to file10 are on the primary and file01 to file05 is already on the standby and a network error happens where file06 to file10 were not transferred and I run rsync, can I use rsync to tell it to copy file06 to file10 because they are missing and copy file01 to file05 only if they had been modified and are now newer than the files that are already in the standby?

Similarly, if we failed over from primary to standby and standby has the file11 to file15 and file13 is missing on primary, can I this time run rsync to copy files from the standby to primary where it only copy over file13 and the rest of the other files BUT only if they had been modified and are now newer than the files that are in the primary.

Basically, what I am ultimately hoping to use rsync with is being able to tell it which of the servers is the source and which one is the target whenever I run rsync. I need to be able to do so since because the role between the servers changes when a failover occurs. Is this possible?

Any advice much appreciated. Thanks in advance.
 

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LEARN ABOUT CENTOS

crm_ticket

PACEMAKER(8)						  System Administration Utilities					      PACEMAKER(8)

NAME

       Pacemaker - Part of the Pacemaker cluster resource manager

SYNOPSIS

       crm_ticket (query|command) [options]

DESCRIPTION

       crm_ticket - Perform tasks related to cluster tickets.  Allows ticket attributes to be queried, modified and deleted.

OPTIONS

       -?, --help
	      This text

       -$, --version
	      Version information

       -V, --verbose
	      Increase debug output

       -Q, --quiet
	      Print only the value on stdout

       -t, --ticket=value
	      Ticket ID

   Queries:
       -l, --info
	      Display the information of ticket(s)

       -L, --details
	      Display the details of ticket(s)

       -w, --raw
	      Display the IDs of ticket(s)

       -q, --query-xml
	      Query the XML of ticket(s)

       -c, --constraints
	      Display the rsc_ticket constraints that apply to ticket(s)

   Commands:
       -g, --grant
	      Grant a ticket to this cluster site

       -r, --revoke
	      Revoke a ticket from this cluster site

       -s, --standby
	      Tell this cluster site this ticket is standby

       -a, --activate
	      Tell this cluster site this ticket is active

   Advanced Commands:
       -G, --get-attr=value
	      Display the named attribute for a ticket

       -S, --set-attr=value
	      Set the named attribtue for a ticket

       -D, --delete-attr=value
	      Delete the named attribute for a ticket

       -C, --cleanup
	      Delete all state of a ticket at this cluster site

   Additional Options:
       -v, --attr-value=value
	      Attribute value to use with -S

       -d, --default=value
	      (Advanced) The default attribute value to display if none is found. For use with -G

       -f, --force
	      (Advanced) Force the action to be performed

       -n, --set-name=value
	      (Advanced) ID of the instance_attributes object to change

       -i, --nvpair=value
	      (Advanced) ID of the nvpair object to change/delete

EXAMPLES

       Display the info of tickets:

	      # crm_ticket --info

       Display the detailed info of tickets:

	      # crm_ticket --details

       Display the XML of 'ticketA':

	      # crm_ticket --ticket ticketA --query-xml

       Display the rsc_ticket constraints that apply to 'ticketA':

	      # crm_ticket --ticket ticketA --constraints

       Grant 'ticketA' to this cluster site:

	      # crm_ticket --ticket ticketA --grant

       Revoke 'ticketA' from this cluster site:

	      # crm_ticket --ticket ticketA --revoke

       Make 'ticketA' standby:

       The  cluster site will treat a granted 'ticketA' as 'standby'.  The dependent resources will be stopped or demoted gracefully without trig-
       gering loss-policies

	      # crm_ticket --ticket ticketA --standby

       Activate 'ticketA' from being standby:

	      # crm_ticket --ticket ticketA --activate

       Get the value of the 'granted' attribute for 'ticketA':

	      # crm_ticket --ticket ticketA --get-attr granted

       Set the value of the 'standby' attribute for 'ticketA':

	      # crm_ticket --ticket ticketA --set-attr standby --attr-value true

       Delete the 'granted' attribute for 'ticketA':

	      # crm_ticket --ticket ticketA --delete-attr granted

       Erase the operation history of 'ticketA' at this cluster site:

       The cluster site will 'forget' the existing ticket state.

	      # crm_ticket --ticket ticketA --cleanup

AUTHOR

       Written by Andrew Beekhof

REPORTING BUGS

       Report bugs to pacemaker@oss.clusterlabs.org

Pacemaker 1.1.10-29.el7 					     June 2014							      PACEMAKER(8)
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