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Demo scripts

Revision as of 11:14, 26 October 2006 by Kir (talk | contribs) (added resource management scenarios)

The following demo scripts (scenarios) can be used to show advantages of OpenVZ.

Contents

Full VE lifecycle

Create VE, set IP, start, add user, enter, exec, show ps -axf output inside VE, stop, and destroy. It should take two minutes ("compare that to a time you need to deploy a new (non-virtual) server!"). During the demonstration, describe what's happening and why.

Here are the example commands needed:

# VE=123
# IP=10.1.1.123
# sed -i "/$IP /d" ~/.ssh/
# time vzctl create $VE --ostemplate fedora-core-5-i386-default
# vzctl set $VE --ipadd $IP --hostname newVE --save
# vzctl start $VE
# vzctl exec $VE ps axf
# vzctl set $VE --userpasswd guest:secret --save
# ssh guest@$IP
[newVE]# ps axf
[newVE]# logout
# vzctl stop $VE
# vzctl destroy $VE

Massive VE creation

Create/start 50 or 100 VEs in a shell loop. Shows fast deployment and high density.

Here are the example commands needed:

# VE=200
# time while [ $VE -lt 250 ]; do \
>  time vzctl create $VE --ostemplate fedora-core-5-i386-default; \
>  vzctl start $VE; \
>  let VE++; \
> done

Massive VE load

Use VEs from previous item — load those by ab or http_load. This demo shows that multiple VEs are working just fine, with low response time etc.

FIXME: commands, ab/http_load setup.

Live migration

If you have two boxes, do "vzmigrate --online" from one box to another. You can use, say, xvnc in a VE and vncclient to connect to it, then run xscreensaver-demo and while the picture is moving do a live migration. You'll show xscreensaver stalls for a few seconds but then keeps running — on another machine! That looks amazing, to say at least.

FIXME: commands, setup, vnc template.

Resource management

Below scenarios aims to show how OpenVZ resource management works.

UBC protection

fork() bomb

FIXME

dentry cache eat up

FIXME

CPU scheduler

FIXME

Disk quota

FIXME