Difference between revisions of "Fedora template update"

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This article describes the procedure of manual template update, using Fedora template as an example.
 
This article describes the procedure of manual template update, using Fedora template as an example.
  
This is useful in the case you have some precreated template which is a bit old, and you want to create many VEs based on it. To escape the updating of all those new VEs right after their creation, it makes sense to update the template itself.
+
This is useful in the case you have some precreated template which is a bit old, and you want to create many [[container]]s based on it. To escape the updating of all those new [[container]]s right after their creation, it makes sense to update the template itself.
  
The idea is simple: you create a temporary VE, start it, run the update cycle and then pack the results into a tarball. Some caution must be taken in order for this tarball to be clean though.
+
The idea is simple: you create a temporary [[container]], start it, run the update cycle and then pack the results into a tarball. Some caution must be taken in order for this tarball to be clean though.
  
The below instructions are for updating Fedora 7 template for PPC architecture, using VE IDs 111 and 222 as temporary VEs. Please substitute your own VE IDs and template names.
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The below instructions are for updating Fedora 7 template for PPC architecture, using VEIDs 111 and 222 as temporary [[container]]s. Please substitute your own VEIDs and template names.
  
== Creating/starting a temporary VE ==
+
== Creating/starting a temporary container ==
  
You should create a temporary VE first.
+
You should create a temporary [[container]] first.
  
 
  # vzctl create 111 --ostemplate fedora-7-ppc-minimal  
 
  # vzctl create 111 --ostemplate fedora-7-ppc-minimal  
Line 16: Line 16:
 
  # vzctl set 111 --ipadd 10.0.0.111 --save
 
  # vzctl set 111 --ipadd 10.0.0.111 --save
  
Finally, start your new VE:
+
Then add a nameserver to the [[container]].  This is necessary so the container and yum can resolve hostnames:
 +
# vzctl set 111 --nameserver <ip addr>
 +
 
 +
Finally, start your new [[container]]:
 
  # vzctl start 111
 
  # vzctl start 111
  
== Updating a VE ==
+
== Updating a container ==
  
First, enter a VE:
+
First, enter a [[container]]:
 
  # vzctl enter 111
 
  # vzctl enter 111
  
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== Clean up ==
 
== Clean up ==
  
Сlean the yum repository inside a VE to minimize:
+
Сlean the yum repository inside a [[container]] to minimize:
 
  # yum clean all
 
  # yum clean all
  
Еxit from a VE and stop it:
+
Еxit from a [[container]] and stop it:
  
 
  # logout
 
  # logout
Line 51: Line 54:
 
  # vzctl stop 111
 
  # vzctl stop 111
  
Remove the IP from the VE:
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Remove the IP from the [[container]]:
 
  # vzctl set 111 --ipdel all --save
 
  # vzctl set 111 --ipdel all --save
  
Line 74: Line 77:
 
The sizes should not differ much.
 
The sizes should not differ much.
  
Try to create and start VE made from your new template:
+
Try to create and start [[container]] made from your new template:
 
  # vzctl create 222 --ostemplate fedora-7-ppc-minimal
 
  # vzctl create 222 --ostemplate fedora-7-ppc-minimal
 
  # vzctl set 222 --ipadd 10.0.0.222 --save
 
  # vzctl set 222 --ipadd 10.0.0.222 --save
Line 80: Line 83:
 
  # vzctl enter 222
 
  # vzctl enter 222
  
Now execute a few basic commands to check VE is fine. Examples are: ps ax, rpm -qa, etc.
+
Now execute a few basic commands to check [[container]] is fine. Examples are: ps ax, rpm -qa, etc.
  
Finally, clean up the testing VE:
+
Finally, clean up the testing [[container]]:
 
  # vzctl stop 222
 
  # vzctl stop 222
 
  # vzctl destroy 222
 
  # vzctl destroy 222
 +
# rm /etc/vz/conf/222.conf.destroyed
  
 
[[Category: HOWTO]]
 
[[Category: HOWTO]]
 
[[Category: Templates]]
 
[[Category: Templates]]

Latest revision as of 02:38, 31 January 2009

This article describes the procedure of manual template update, using Fedora template as an example.

This is useful in the case you have some precreated template which is a bit old, and you want to create many containers based on it. To escape the updating of all those new containers right after their creation, it makes sense to update the template itself.

The idea is simple: you create a temporary container, start it, run the update cycle and then pack the results into a tarball. Some caution must be taken in order for this tarball to be clean though.

The below instructions are for updating Fedora 7 template for PPC architecture, using VEIDs 111 and 222 as temporary containers. Please substitute your own VEIDs and template names.

Creating/starting a temporary container[edit]

You should create a temporary container first.

# vzctl create 111 --ostemplate fedora-7-ppc-minimal 

Next you should assign a proper IP address to it. This IP does not have to be public -- see Using NAT for VE with private IPs.

# vzctl set 111 --ipadd 10.0.0.111 --save

Then add a nameserver to the container. This is necessary so the container and yum can resolve hostnames:

# vzctl set 111 --nameserver <ip addr>

Finally, start your new container:

# vzctl start 111

Updating a container[edit]

First, enter a container:

# vzctl enter 111

Check that you can access Internet:

# ping -c 1 www.ru 
PING www.ru (194.87.0.50) 56(84) bytes of data.
64 bytes from www.ru (194.87.0.50): icmp_seq=1 ttl=56 time=1.92 ms

--- www.ru ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.920/1.920/1.920/0.000 ms

Next, run the update procedure:

# yum -y update

As this can take a few minutes or even hours, this is good time to go make some coffee.

Clean up[edit]

Сlean the yum repository inside a container to minimize:

# yum clean all

Еxit from a container and stop it:

# logout
exited from VE 111
# vzctl stop 111

Remove the IP from the container:

# vzctl set 111 --ipdel all --save

Packing a new template cache[edit]

Now, rename or remove the existing template cache:

# mv /vz/template/cache/fedora-7-ppc-minimal.tar.gz /vz/template/cache/fedora-7-ppc-minimal.tar.gz-old

Now create a new tarball:

# cd /vz/private/111
# tar czf /vz/template/cache/fedora-7-ppc-minimal.tar.gz .

Clean up:

# vzctl destroy 111

Testing[edit]

First, compare the sizes of the old and the new template caches:

# ls -lh /vz/template/cache/fedora-7-ppc-minimal*
-rw-r--r-- 1 root root  99M 2007-11-13 18:11 /vz/template/cache/fedora-7-ppc-minimal.tar.gz
-rw-r--r-- 1 root root  91M 2007-08-31 02:46 /vz/template/cache/fedora-7-ppc-minimal.tar.gz-old

The sizes should not differ much.

Try to create and start container made from your new template:

# vzctl create 222 --ostemplate fedora-7-ppc-minimal
# vzctl set 222 --ipadd 10.0.0.222 --save
# vzctl start 222
# vzctl enter 222

Now execute a few basic commands to check container is fine. Examples are: ps ax, rpm -qa, etc.

Finally, clean up the testing container:

# vzctl stop 222
# vzctl destroy 222
# rm /etc/vz/conf/222.conf.destroyed