Section: C3 User Manual (4)
Updated: 4.0
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cpushimage - A utility to push hard drive images created by SystemImager from a server to the cluster nodes.  


Usage: cpushimage [OPTIONS] [MACHINE DEFINITIONS] image_name  


cpushimage is a utility to push hard drive images created by SystemImager from a server to the cluster nodes by executing the SystemImager updateclient script on each node. The updateclient script then retrieves the specified image from the server and updates the cluster node. In order to use cpushimage, you must be the root user.  


--help -h
:display help message

:don't run LILO after update

--reboot -r
:reboot nodes after updates complete

--file -f
:alternate cluster configuration file if one is not supplied then /etc/c3.conf will be used

:interactive mode, ask once before executing

:execute command on all nodes in all clusters that are accessible. When specifying --head only the head nodes will participate. This ignores the [MACHINE_DEFINITIONS] section.


There are ways to call cpushimage:

1. To push an image to the local cluster:

cpushimage base_image

2. to push an image on a remote cluster

cpushimage cluster2: weather_image

Note: when pushing an image on a remote cluster the image must reside on the head node of that cluster, that is the image being pushed to any given cluster MUST reside on that clusters head node.

3. to push an image to a subset of a cluster

cpushimage cluster3:0-3 test_image

Only pushes the image to the first four nodes of the cluster (0 , 1, 2, 3)


See the C3 INSTALL file for installation instructions. Also see C3-range for help on node ranges on the command line. If using the scalable setup please see c3-scale




By default, the C3 tools will use ssh to issue the remote commands. If you would like to have them use rsh instead, you must set the C3_RSH environment variable to rsh.
For example, if you are using the bash shell you would do the following:

export C3_RSH=rsh

any program that behaves like rsh or ssh is acceptable


The default install path for C3 is /opt/c3-4. If you install C3 in an alternate location this variable must point to that installation. For remote clusters C3 must be installed in the same directory on each cluster.
For example, if you installed C3 in your home directory you might use the following:

export C3_PATH=/home/sgrundy/c3-4


C3's default configuration file is /etc/c3.conf. If you wish an alternate default configuration file set this to point to the file
For example, if you keep a special c3.conf file in your home directory you may use:

export C3_CONF=/home/sgrundy/.c3conf


By default, the C3 tools will use your local username to access a remote cluster. If you wish to use a different default then set this variable to it
For example, this will change the example user from sgrundy to mmanhunter:

export C3_USER=mmanhunter




This file is the cluster configuration file that contains the names of the nodes to which commands will be sent. The cluster configuration file of nodes may also be specified from the command line. The format of both files is identical.
See the c3.conf(5) man page for format


cexec(1), c3(1), cget(1), ckill(1), cpush(1 ), cpushimage(4), crm(1), cshutdown(4), cname(1), cnum(1), clist(1), c3.conf(5), c3-scale(5)




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Computer Science and Math Division
Oak Ridge National Laboratory
Last Modified: Fri 01-15-2021