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The following demo scripts (scenarios) can be used to show advantages of OpenVZ. | The following demo scripts (scenarios) can be used to show advantages of OpenVZ. | ||
| − | == Full | + | == Full VE lifecycle == |
| − | Create | + | 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. |
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| − | It should take | ||
| − | to deploy a new (non-virtual) server!" | ||
| − | describe what's happening and why. | ||
Here are the example commands needed: | Here are the example commands needed: | ||
| − | # | + | # VE=123 |
# IP=10.1.1.123 | # IP=10.1.1.123 | ||
# sed -i "/$IP /d" ~/.ssh/ | # sed -i "/$IP /d" ~/.ssh/ | ||
| − | # time vzctl create $ | + | # time vzctl create $VE --ostemplate fedora-core-5-i386-default |
| − | # vzctl set $ | + | # vzctl set $VE --ipadd $IP --hostname newVE --save |
| − | # vzctl start $ | + | # vzctl start $VE |
| − | # vzctl exec $ | + | # vzctl exec $VE ps axf |
| − | # vzctl set $ | + | # vzctl set $VE --userpasswd guest:secret --save |
# ssh guest@$IP | # ssh guest@$IP | ||
| − | [ | + | [newVE]# ps axf |
| − | [ | + | [newVE]# logout |
| − | # vzctl stop $ | + | # vzctl stop $VE |
| − | # vzctl destroy $ | + | # vzctl destroy $VE |
| − | == Massive | + | == Massive VE creation == |
| − | Create/start 50 or 100 | + | Create/start 50 or 100 VEs in a shell loop. Shows fast deployment and high density. |
| − | and high density. | ||
Here are the example commands needed: | Here are the example commands needed: | ||
| − | + | # VE=200 | |
| − | # time | + | # time while [ $VE -lt 250 ]; do \ |
| − | > time vzctl create $ | + | > time vzctl create $VE --ostemplate fedora-core-5-i386-default; \ |
| − | > vzctl start $ | + | > vzctl start $VE; \ |
| − | > | + | > let VE++; \ |
| − | + | > done | |
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| − | + | == Massive VE load == | |
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| − | + | Use VEs from previous item — load those by <code>ab</code> or <code>http_load</code>. This demo shows that multiple VEs are working just fine, with low response time etc. | |
| − | + | FIXME: commands, ab/http_load setup. | |
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| − | FIXME: http_load | ||
== Live migration == | == Live migration == | ||
| − | If you have two boxes, do <code>vzmigrate --online</code> from one box | + | If you have two boxes, do "<code>vzmigrate --online</code>" from one box to another. You can use, say, <code>xvnc</code> in a VE and <code>vncclient</code> to connect to it, then run <code>xscreensaver-demo</code> and while the picture is moving do a live migration. You'll show <code>xscreensaver</code> stalls for a few seconds but then keeps running — on another machine! That looks amazing, to say at least. |
| − | to another. You can use, say, <code>xvnc</code> in a | ||
| − | <code>vncclient</code> to connect to it, then run | ||
| − | <code>xscreensaver-demo</code> | ||
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| − | migration. You'll | ||
| − | seconds but then | ||
| − | to say at least. | ||
| − | FIXME: commands, setup, | + | FIXME: commands, setup, vnc template. |
== Resource management == | == Resource management == | ||
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> done | > done | ||
</pre> | </pre> | ||
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==== dentry cache eat up ==== | ==== dentry cache eat up ==== | ||
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=== CPU scheduler === | === CPU scheduler === | ||
| − | + | Create 3 VPSes: | |
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| − | Create 3 | ||
<pre> | <pre> | ||
# vzctl create 101 | # vzctl create 101 | ||
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</pre> | </pre> | ||
| − | Set | + | Set VPS weights: |
<pre> | <pre> | ||
# vzctl set 101 --cpuunits 1000 --save | # vzctl set 101 --cpuunits 1000 --save | ||
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</pre> | </pre> | ||
| − | We set next | + | We set next cpu sharing <code>VPS101 : VPS102 : VPS103 = 1 : 2 : 3</code> |
| − | + | Run VPSes: | |
<pre> | <pre> | ||
# vzctl start 101 | # vzctl start 101 | ||
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</pre> | </pre> | ||
| − | Run busy loops in | + | Run busy loops in VPSes: |
<pre> | <pre> | ||
# vzctl enter 101 | # vzctl enter 101 | ||
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bash 17.5 | bash 17.5 | ||
</pre> | </pre> | ||
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=== Disk quota === | === Disk quota === | ||
<pre> | <pre> | ||
| − | # vzctl set | + | # vzctl set VEID --diskspace 1048576:1153434 --save |
| − | # vzctl start | + | # vzctl start VEID |
| − | # vzctl enter | + | # vzctl enter VEID |
[ve]# dd if=/dev/zero of=/tmp/tmp.file bs=1048576 count=1000 | [ve]# dd if=/dev/zero of=/tmp/tmp.file bs=1048576 count=1000 | ||
dd: writing `/tmp/tmp.file': Disk quota exceeded | dd: writing `/tmp/tmp.file': Disk quota exceeded | ||
</pre> | </pre> | ||
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