Archiv für: März 2011, 15
15.03.11
Script to double/halve OpenVZ resources
The following script allows you to easily double or halve resources in an OpenVZ container.
You would install this script as "/usr/local/bin/vz-double-resources" and also create a symlink named "vz-half-resources" to it (probably also in /u/l/b).
This then allows you to just call "vz-double-resources 123 shmpages" in case you've been notified that there have been shmpages beancounter failures (resource limit has been hit).
This outputs the command to double the bean counter limit, and allows for easy execution by just forwarding the output to "sh", as in "vz-double-resources 123 shmpages | sh -".
Here's the script (available and maintained as/at Gist):
Code:
# cat =vz-double-resources | |
#!/bin/bash | |
| |
VZ="$1" | |
RESOURCE="$2" | |
| |
if [ -z $VZ ] || [ -z $RESOURCE ]; then | |
echo "Usage: $0 VZ RESOURCE" | |
exit 1 | |
fi | |
| |
case $0 in | |
*-double-*) OPERATION="*2" ;; | |
*-half-*) OPERATION="/2" ;; | |
*) echo "Invalid: $0" ; exit 1;; | |
esac | |
| |
echo "# Operation: $OPERATION" | |
| |
# get failures: | |
# awk '$NF ~ /[0-9]*[1-9]$/' /proc/bc/*/resources | |
| |
if [ -f /proc/bc/$VZ/resources ] ; then | |
# uid resource held maxheld barrier limit failcnt | |
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resource=$(echo $RESOURCE | tr '[:upper:]' '[:lower:]') | |
awk /$resource/ /proc/bc/$VZ/resources | { | |
read resource held maxheld barrier limit failcnt | |
if [ -n "$resource" ]; then | |
cmd="vzctl set $VZ --$resource $(($barrier $OPERATION)):$(($limit $OPERATION)) --save" | |
echo $cmd | |
exit | |
fi | |
} | |
fi | |
[[ -n "$cmd" ]] && exit | |
if [ -f /etc/vz/conf/$VZ.conf ] ; then | |
value=$(grep -i "^$RESOURCE=" /etc/vz/conf/$VZ.conf) | |
eval $value | |
RESOURCE=$(echo $RESOURCE | tr '[:lower:]' '[:upper:]') | |
resource=$(echo $RESOURCE | tr '[:upper:]' '[:lower:]') | |
value=$(eval echo \$${RESOURCE}) | |
echo $value | { | |
IFS=: read barrier limit | |
cmd="vzctl set $VZ --$resource $(($barrier $OPERATION)):$(($limit $OPERATION)) --save" | |
echo $cmd | |
} | |
else | |
echo "ERROR: container $VZ not found." | |
exit 1 | |
fi |
This is a script I've been using since quite a while (otherwise it would use zsh instead of bash), and have not looked into after creating it.
I just noticed that it is quite useful in general and therefore wanted to make it public.
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