Cloning ploop containers - Revision history

Sergey Bronnikov: added category

2015-09-01T10:35:20Z

added category

Kir: fixed vz7 script; added a note on disk space

2015-09-01T01:18:59Z

fixed vz7 script; added a note on disk space

Kir: created

2015-09-01T00:54:30Z

created

New page

This describes a non-official and unsupported method of cloning ploop containers. It uses shared base ploop delta (this configuration is not officially supported but apparently works just fine).

This method lets you very quickly create thousands of identical containers. This might be useful for example in testing.

== Legacy OpenVZ ==

<source lang="bash">
SRCID=50 # "Donor" container ID
TMPL=centos-6-x86_64 # Template to use

vztmpl-dl $TMPL # make sure we use the latest one
vzctl create $SRCID --ostemplate $TMPL

vzctl mount $SRCID
while killall -0 ext4lazyinit; do sleep 1; done
vzctl umount $SRCID

vzctl snapshot $SRCID

for CT in $(seq 1000 2000); do \
mkdir -p /vz/private/$CT/root.hdd /vz/root/$CT; \
ln /vz/private/$SRCID/root.hdd/root.hdd /vz/private/$CT/root.hdd/root.hdd; \
cp -nr /vz/private/$SRCID/root.hdd /vz/private/$CT/; \
cp /etc/vz/conf/$SRCID.conf /etc/vz/conf/$CT.conf; \
done

vzctl set $SRCID --disabled yes --save # make sure we don't use it
</source>

== VZ7 ==

The differences from the above script are:

# Need to run <code>vzpkg</code> instead of <code>vztmpl-dl</code>
# Need to remove <code>VEID=</code> line from the "donor" config file
# Need to copy <code>.ve.layout</code> from the donor private area

<source lang="bash">
SRCID=50 # "Donor" container ID
TMPL=centos-6-x86_64 # Template to use

vzpkg update cache $TMPL # make sure we use the latest one
vzctl create $SRCID --ostemplate $TMPL
vzctl mount $SRCID
while killall -0 ext4lazyinit; do sleep 1; done
vzctl umount $SRCID

vzctl snapshot $SRCID

sed -ie '/^VEID=/d' /etc/vz/conf/$SRCID.conf

for CT in $(seq 1000 2000); do \
mkdir -p /vz/private/$CT/root.hdd /vz/root/$CT; \
ln /vz/private/$SRCID/root.hdd/root.hdd /vz/private/$CT/root.hdd/root.hdd; \
cp -nr /vz/private/$SRCID/root.hdd /vz/private/$CT/; \
cp /etc/vz/conf/$SRCID.conf /etc/vz/conf/$CT.conf; \
cp -a /vz/private/50/.ve.layout /vz/private/$CT/; \
done
</source>

← Older revision		Revision as of 10:35, 1 September 2015
Line 61:		Line 61:
	vzctl set $SRCID --disabled yes --save # make sure we don't use it		vzctl set $SRCID --disabled yes --save # make sure we don't use it
	</source>		</source>
		+
		+	[[Category: Storage]]

@@ Line 1: / Line 1: @@
 This describes a non-official and unsupported method of cloning ploop containers. It uses shared base ploop delta (this configuration is not officially supported but apparently works just fine).
-This method lets you very quickly create thousands of identical containers. This might be useful for example in testing.
+This method lets you very quickly create thousands of identical containers, saving a lot of disk space as well. This might be useful for example in testing, but should not be used in production.
 == Legacy OpenVZ ==
@@ Line 34: / Line 34: @@
 # Need to run <code>vzpkg</code> instead of <code>vztmpl-dl</code>
 # Need to remove <code>VEID=</code> line from the "donor" config file
-# Need to copy <code>.ve.layout</code> from the donor private area
+# Need to copy <code>.ve.layout</code> from the donor private area#
 <source lang="bash">
@@ Line 52: / Line 53: @@
 for CT in $(seq 1000 2000); do \
         mkdir -p /vz/private/$CT/root.hdd /vz/root/$CT; \
-        ln /vz/private/$SRCID/root.hdd/root.hdd /vz/private/$CT/root.hdd/root.hdd; \
+        ln /vz/private/$SRCID/root.hdd/root.hds /vz/private/$CT/root.hdd/root.hds; \
         cp -nr /vz/private/$SRCID/root.hdd /vz/private/$CT/; \
         cp /etc/vz/conf/$SRCID.conf /etc/vz/conf/$CT.conf; \
         cp -a /vz/private/50/.ve.layout /vz/private/$CT/; \
 done
 </source>