cpush - A utility to distribute files to the nodes

cpush is a utility that uses rsync to send a file or set of files specified by c3.conf

 cpush [OPTIONS] [MACHINE DEFINITIONS] source target

NOTE: The current version of cpush requires specifying both source and target

# cpush -n /etc/hosts /etc/hosts
rsync -az  --rsh=ssh  /etc/hosts root@lustwzb1:/etc/hosts
rsync -az  --rsh=ssh  /etc/hosts root@lustwzb2:/etc/hosts
rsync -az  --rsh=ssh  /etc/hosts root@lustwzb3:/etc/hosts

Examples

There are many ways to call cpush, here is a few examples:

1. To move a single file

cpush /home/filename /home/ 

2. To move a single file, renaming that file on the cluster nodes

cpush /home/filename1 /home/filename2

3. To move a set of files listed in a file

cpush --list=/home/filelist

Options

• -h, --help  :display help message
• -f, --file <filename> :alternate cluster configuration file, if one is not supplied then /etc/c3.conf will be used
• --all  :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.
• -i  :interactive mode, ask once before executing
• --head  execute command on head node, does not execute on compute nodes
• -l, --list <filename>  :list of files to push (see files section for format)
• --nolocal  :the source file or directory lies on the head node of the remote cluster
• -b, --blind  :pushes the entire file (normally cpush uses rsync to push changes and then rebuilds the file on the target node)
• 
   

Environment variables

C3_RSH

 

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

C3_PATH

 

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_CONF

 

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

 

C3_USER

 

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

 

 

Recommended Links

• 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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Last modified: March 12, 2019