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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.
 
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You can loop through all VEs and execute this this easily:
 
 
<code>
 
<code>
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  for veid in `vzlist -Hoveid`; do vzctl exec $veid COMMAND; done
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#!/bin/bash
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</code>
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CONFDIR="/etc/vz/conf"
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if [ "$1" == "" ]; then
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Knowing this, you can also save some typing later by making a simple utility out of it.
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  echo "$0 -- Execute a command on all VEs"
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I like to call this ''/usr/sbin/vzexec'' so I can later just say ''vzexec apachectl restart''
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  echo ""
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<code>
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  echo "Example: vzexec service httpd restart"
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  #!/bin/bash
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  echo ""
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  # vzexec -- execute a command on all VEs
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  echo "Note that variables are expanded in the host's shell, and use '' to prevent this."
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  if [ "$1" == "" ]; then
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  echo "Example:  vzexec echo \$PWD    and  vzexec 'echo \$PWD'  are different."
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    echo "$0 -- Execute a command on all VEs"
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  exit
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    echo ""
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fi
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    echo "Example: vzexec service httpd restart"
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for veconf in $CONFDIR/*.conf ; do
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    echo ""
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  veid=`basename $veconf .conf`
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    echo "Note that variables are expanded in the host's shell, and use ' ' to prevent this."
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   if [ "$veid" == "0" ]; then continue; fi
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    echo "Example:  vzexec echo \$PWD    and  vzexec 'echo \$PWD'  are different."
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   vename=`grep ^NAME $veconf | head -1 | sed -e 's@NAME=@@' | sed -e 's@"@@g'`
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    exit
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  echo "*** VE $veid ($vename)"
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   fi
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  vzctl exec $veid $@
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   for veid in `vzlist -Hoveid`; do
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done
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    echo "*** VE $veid"
 
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    vzctl exec $veid $@
 
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  done
 
 
</code>
 
</code>

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