Collect command outputs from all nodes in a cloud

collect

#!/bin/bash
#
# setup: to populate all-nodes file on a fuel master, run this once in a while:
# fuel node|awk '/ready/ {print "node-" $1}'|sort >all-nodes
# otherwise, put a list of hostnames on separate lines in all-nodes
#
# usage:
# collect <args>
#
# runs <args> on all nodes, collecting output into a nicely named file in
# a directory associated with each node.
#
################################################################################

# construct a filename using the arguments but ensuring it can be a filename
# it replaces slashes, spaces, redirects, and pipes, and adds the current date
now="_"`date +%j_%T`
filename=`echo $* $now|sed -e 's,/,_,g' -e 's/ //g' -e 's/>/_gt_/g' -e 's/</_lt_/g' -e 's/|/=/g'`

# loop over all nodes ssh-ing to them, sourcing openrc, and running our arguments
# output from the command goes into the filename whose name we created above,
# in a directory for the node.

for h in `cat all-nodes`; do \
    [ -d $h ] || mkdir $h ; \
    echo -n '.' && \
    ssh -n $h '. openrc;'$* > $h/$filename 2<&1; done
echo "done."