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confluent/confluent_client/doc/man/nodeshell.ronn

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nodeshell(8) -- Execute command on many nodes in a noderange through ssh
=========================================================================
## SYNOPSIS
`nodeshell [options] <noderange> <command to execute on each node>`
## DESCRIPTION
Allows execution of a command on many nodes in parallel. Like noderun(8), it
accepts and interpolates confluent attribute expressions as documented in
nodeattribexpressions(5). `nodeshell` provides stdout as stdout and stderr
as stderr, unlike psh which combines all stdout and stderr into stdout.
## OPTIONS
* `-c COUNT`, `-f COUNT`, `--count=COUNT`
Specify the maximum number of instances to run concurrently
* `-m MAXNODES`, `--maxnodes=MAXNODES`
Specify a maximum number of nodes to run remote ssh command to, prompting
if over the threshold
* `-n`, `--nonodeprefix`
Do not prefix output with node names
* `-p PORT`, `--port=PORT`
Specify a custom port for ssh
* `-s SUBSTITUTION`, `--substitutename=SUBSTITITUTION`
Specify a substitution name instead of the nodename. If no {} are in the substitution,
it is considered to be an append. For example, '-s -ib' would produce 'node1-ib' from 'node1'.
Full expression syntax is supported, in which case the substitution is considered to be the entire
new name. {node}-ib would be equivalent to -ib. For example, nodeshell -s {bmc} node1
would ssh to the BMC instead of the node.
## EXAMPLES
* Running `echo hi` on for nodes:
`# nodeshell n1-n4 echo hi`
`n1: hi`
`n2: hi`
`n3: hi`
`n4: hi`
* Setting a new static ip address temporarily on secondary interface of four nodes:
`# nodeshell n1-n4 ifconfig eth1 172.30.93.{n1}`
* If wanting to use literal {} in the command, they must be escaped by doubling:
`# nodeshell n1-n4 "ps | awk '{{print $1}}'"`
## SEE ALSO
noderun(8)