Editing Centos Upgrade 4.x to 5.x

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follow these steps:
 
follow these steps:
  
==Create the container==
+
==Create a container using centos-4-i386-minimal and set a valid nameserver==
 
 
Create a container using centos-4-i386-minimal and set a valid nameserver:
 
 
<pre>
 
<pre>
 
vzctl create $CTID --ostemplate centos-4-i386-minimal --config CONFIG_TEMPLATE --ipadd container_IP --hostname temp
 
vzctl create $CTID --ostemplate centos-4-i386-minimal --config CONFIG_TEMPLATE --ipadd container_IP --hostname temp
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</pre>
 
</pre>
  
 +
== Enter container ==
 +
<pre>
 +
vzctl enter $CTID
 +
</pre>
  
 
==Install centos-5-release packages==
 
==Install centos-5-release packages==
Use <code>vzctl exec</code> to execute the rpm install command on the container:
 
  
<pre>
+
rpm -Uvh http://mirror.centos.org/centos/5/os/i386/CentOS/centos-release-notes-5.6-0.i386.rpm \
vzctl exec $CTID rpm -Uvh http://mirror.centos.org/centos/5/os/i386/CentOS/centos-release-notes-5.6-0.i386.rpm \ http://mirror.centos.org/centos/5/os/i386/CentOS/centos-release-5-6.el5.centos.1.i386.rpm
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  http://mirror.centos.org/centos/5/os/i386/CentOS/centos-release-5-6.el5.centos.i386.rpm
</pre>
+
 
 
Note: centos-release-5 depends on notes-package, start with that one.
 
Note: centos-release-5 depends on notes-package, start with that one.
  
 
==Backup dev==
 
==Backup dev==
  
Backup the container /dev/ directory, as initscripts needs udev and will remove vzdev you'll need the backup:
+
Backup your /dev/ directory, as initscripts needs udev and will remove vzdev you'll need the backup:
  
 
<pre>
 
<pre>
tar -cf $CTID.dev.tar -C /vz/private/$CTID dev
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tar -cf dev.tar ./dev
 
</pre>
 
</pre>
  
==Install initscripts package==
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==Install initscripts package (forced and with no deps)==
 
 
Install initscripts package (forced and with no deps), as per below:
 
  
 
<pre>
 
<pre>
vzctl exec $CTID rpm -Uvh http://mirror.centos.org/centos/5/os/i386/CentOS/initscripts-8.45.33-1.el5.centos.i386.rpm --force --nodeps
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rpm -Uvh http://mirror.centos.org/centos/5/os/i386/CentOS/initscripts-8.45.33-1.el5.centos.i386.rpm --force --nodeps
 
</pre>
 
</pre>
  
 
Note: If the "transfer failed", go to the [http://mirror.centos.org/centos/5/os/i386/CentOS/ CentOS5 mirror] and find the latest initscripts rpm and use that instead.
 
Note: If the "transfer failed", go to the [http://mirror.centos.org/centos/5/os/i386/CentOS/ CentOS5 mirror] and find the latest initscripts rpm and use that instead.
 +
 +
==Exit from container==
 +
<pre>
 +
exit
 +
</pre>
  
 
==Update conf file==
 
==Update conf file==
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Alternatively, use the 'sed' command to replace it:
 
Alternatively, use the 'sed' command to replace it:
 
<pre>
 
<pre>
sed -i 's#OSTEMPLATE="centos-4#OSTEMPLATE="centos-5#g' /etc/vz/conf/$CTID.conf
+
sed -i 's#OSTEMPLATE="centos-4#OSTEMPLATE="centos-5#g' /etc/vz/conf/$CSID.conf
 
</pre>
 
</pre>
  
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<pre>
 
<pre>
vzctl exec $CTID rpm -e --justdb python-elementtree --nodeps
+
vzctl exec 113 rpm -e --justdb python-elementtree --nodeps
vzctl exec $CTID rpm --import http://mirrors.kernel.org/centos/RPM-GPG-KEY-CentOS-5
+
vzctl exec 113 rpm --import http://mirrors.kernel.org/centos/RPM-GPG-KEY-CentOS-5
</pre>
 
 
 
==Test your VE==
 
Check you can enter your VE:
 
<pre>
 
vzctl enter $CTID
 
 
</pre>
 
</pre>
 
All went OK? Exit the VE:
 
<pre>
 
exit
 
</pre>
 
 
===Troubleshooting===
 
 
<pre>
 
Unable to open pty: No such file or directory
 
</pre>
 
If you see errors like this, see the [[VPS_enter_failed]] article.
 
  
 
==Stop your VE==
 
==Stop your VE==
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</pre>
 
</pre>
  
==Restore dev==
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==Replace the new /dev/ with the old one==
 
 
This will replace the new /dev/ with the old one:
 
 
<pre>
 
<pre>
mv /vz/private/$CTID/dev /vz/private/$CTID/dev.old
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cd /vz/private/$CTID
tar -xvf $CTID.dev.tar -C /vz/private/$CTID
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rm -rf dev
 +
tar -xvf dev.tar
 
</pre>
 
</pre>
  

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