09-04-2018
Proliferate commands across nodes?
Hi folks.
I've been a developer for far too many years, but know very little of unix. I have setup a very inexpensive cluster of 6 raspberry pi nodes so I can play around with multi node programming. This is only for fun, but I want to learn properly, else what's the point?!
Setup can be a bit of a ball ache with proliferating code and commands.
Could you please suggest software that will allow me to send commands to node 1 and have that proliferated to the other 5? I have searched for this and found a few possibilities, most do a lot more than I need and the one that looks perfect (fabric) doesn't install in Raspbian, no idea why.
I'm sure I could write a bash with ssh and accomplish the basics, but I like the idea of asynchronous replies which I think is going to be a depth to far.
Any suggestions welcome, and if you have an opinion of one thing over another please let me know why.
Many thanks.
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LEARN ABOUT SUSE
crm_attribute
CRM_ATTRIBUTE(8) [FIXME: manual] CRM_ATTRIBUTE(8)
NAME
crm_attribute - manipulate attributes in the CIB
SYNOPSIS
crm_attribute [options]
DESCRIPTION
The crm_attribute command queries and manipulates node attributes and cluster configuration options that are used in the CIB.
OPTIONS
--help, -?
Print a help message.
--verbose, -V
Turn on debug information.
Note
Increase the level of verbosity by providing additional instances.
--quiet, -Q
When doing an attribute query using -G, print just the value to stdout. Use this option with -G.
--get-value, -G
Retrieve rather than set the preference.
--delete-attr, -D
Delete rather than set the attribute.
--attr-value string, -v string
Value to set. This is ignored when used with -G.
--node-uuid node_uuid, -u node_uuid
Specify the UUID of the node to change.
--node-uname node_uname, -U node_uname
Specify the uname of the node to change.
--set-name string, -s string
Specify the set of attributes in which to read or write the attribute.
--attr-name string, -n string
Specify the attribute to set or query.
--type string, -t type
Determine to which section of the CIB the attribute should be set or to which section of the CIB the attribute that is queried belongs
Possible values are nodes, status, or crm_config.
Additional Options:
+-----------+--------------------+
|Type | Additional Options |
+-----------+--------------------+
|nodes | -(U|u) -n [-s] |
+-----------+--------------------+
|status | -(U|u) -n [-s] |
+-----------+--------------------+
|crm_config | -n [-s] |
+-----------+--------------------+
EXAMPLES
Query the value of the location attribute in the nodes section for the host myhost in the CIB:
crm_attribute -G -t nodes -U myhost -n location
Query the value of the cluster-delay attribute in the crm_config section in the CIB:
crm_attribute -G -t crm_config -n cluster-delay
Query the value of the cluster-delay attribute in the crm_config section in the CIB. Print just the value:
crm_attribute -G -Q -t crm_config -n cluster-delay
Delete the location attribute for the host myhost from the nodes section of the CIB:
crm_attribute -D -t nodes -U myhost -n location
Add a new attribute called location with the value of office to the set subsection of the nodes section in the CIB (settings applied to the
host myhost):
crm_attribute -t nodes -U myhost -s set -n location -v office
Change the value of the location attribute in the nodes section for the myhost host:
crm_attribute -t nodes -U myhost -n location -v backoffice
FILES
/var/lib/heartbeat/crm/cib.xml--the CIB (minus status section) on disk. Editing this file directly is strongly discouraged.
SEE ALSO
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AUTHOR
crm_attribute was written by Andrew Beekhof.
[FIXME: source] 07/05/2010 CRM_ATTRIBUTE(8)