Difference between revisions of "ExecuteInAllVEs"
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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 | + | 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. |
| + | You can loop through all VEs and execute this this easily: | ||
| + | <code> | ||
| + | for veid in `vzlist -Hoveid`; do vzctl exec $veid COMMAND; done | ||
| + | </code> | ||
| + | |||
| + | Knowing this, you can also save some typing later by making a simple utility out of it. | ||
| + | I like to call this ''/usr/sbin/vzexec'' so I can later just say ''vzexec apachectl restart'' | ||
<code> | <code> | ||
#!/bin/bash | #!/bin/bash | ||
| − | + | # vzexec -- execute a command on all VEs | |
if [ "$1" == "" ]; then | if [ "$1" == "" ]; then | ||
echo "$0 -- Execute a command on all VEs" | echo "$0 -- Execute a command on all VEs" | ||
| Line 13: | Line 20: | ||
exit | exit | ||
fi | fi | ||
| − | for | + | for veid in `vzlist -Hoveid`; do |
| − | + | echo "*** VE $veid" | |
| − | |||
| − | |||
| − | echo "*** VE $veid | ||
vzctl exec $veid $@ | vzctl exec $veid $@ | ||
done | done | ||
</code> | </code> | ||
Latest revision as of 15:23, 6 January 2008
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.
You can loop through all VEs and execute this this easily:
for veid in `vzlist -Hoveid`; do vzctl exec $veid COMMAND; done
Knowing this, you can also save some typing later by making a simple utility out of it.
I like to call this /usr/sbin/vzexec so I can later just say vzexec apachectl restart
#!/bin/bash
# vzexec -- execute a command on all VEs
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 veid in `vzlist -Hoveid`; do
echo "*** VE $veid"
vzctl exec $veid $@
done
