ExecuteInAllVEs

I found myself often faced with a need to run the same command in all VEs, e.g. apachectl restart to restart all webservers or dmesg | tail to see the latest news from everybody. This simple utility is just a loop around vzctl exec but I find it very handy.

 #!/bin/bash
 # vzexec -- execute a command on all VEs
 CONFDIR="/etc/vz/conf"
 if [ "$1" == "" ]; then
   echo "$0 -- Execute a command on all VEs"
   echo ""
   echo "Example: vzexec service httpd restart"
   echo ""
   echo "Note that variables are expanded in the host's shell, and use ' ' to prevent this."
   echo "Example:   vzexec echo \$PWD    and   vzexec 'echo \$PWD'   are different."
   exit
 fi
 for veconf in $CONFDIR/*.conf ; do
   veid=`basename $veconf .conf`
   if [ "$veid" == "0" ]; then continue; fi
   vename=`grep ^NAME $veconf | head -1 | sed -e 's@NAME=@@' | sed -e 's@"@@g'`
   echo "*** VE $veid ($vename)"
   vzctl exec $veid $@
 done