Difference between revisions of "Centos Upgrade 4.x to 5.x"

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(→‎Install initscripts package (forced and with no deps): improved)
(improved tar based backup/restore)
 
(4 intermediate revisions by the same user not shown)
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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>
 
<pre>
−
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
+
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
 
</pre>
 
</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.
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==Backup dev==
 
==Backup dev==
  
−
Backup your /dev/ directory, as initscripts needs udev and will remove vzdev you'll need the backup:
+
Backup the container /dev/ directory, as initscripts needs udev and will remove vzdev you'll need the backup:
  
 
<pre>
 
<pre>
−
tar -cf dev.tar ./dev
+
tar -cf $CTID.dev.tar -C /vz/private/$CTID dev
 
</pre>
 
</pre>
  
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<pre>
 
<pre>
−
rpm -Uvh http://mirror.centos.org/centos/5/os/i386/CentOS/initscripts-8.45.33-1.el5.centos.i386.rpm --force --nodeps
+
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
 
</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/$CSID.conf
+
sed -i 's#OSTEMPLATE="centos-4#OSTEMPLATE="centos-5#g' /etc/vz/conf/$CTID.conf
 
</pre>
 
</pre>
  
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vzctl exec $CTID rpm --import http://mirrors.kernel.org/centos/RPM-GPG-KEY-CentOS-5
 
vzctl exec $CTID rpm --import http://mirrors.kernel.org/centos/RPM-GPG-KEY-CentOS-5
 
</pre>
 
</pre>
 +
 +
==Test your VE==
 +
Check you can enter your VE:
 +
<pre>
 +
vzctl enter $CTID
 +
</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>
  
−
==Replace the new /dev/ with the old one==
+
==Restore dev==
 +
 
 +
This will replace the new /dev/ with the old one:
 
<pre>
 
<pre>
−
cd /vz/private/$CTID
+
mv /vz/private/$CTID/dev /vz/private/$CTID/dev.old
−
mv dev dev.old
+
tar -xvf $CTID.dev.tar -C /vz/private/$CTID
−
tar -xvf dev.tar
 
 
</pre>
 
</pre>
  

Latest revision as of 22:25, 2 June 2011

Yellowpin.svg Note: this article is not formatted according to this Wiki standards. Please help reformatting it in a better way.

To create a CentOS 5 minimal template from centos-4-i386-minimal, follow these steps:

Create the container[edit]

Create a container using centos-4-i386-minimal and set a valid nameserver: 

vzctl create $CTID --ostemplate centos-4-i386-minimal --config CONFIG_TEMPLATE --ipadd container_IP --hostname temp
vzctl set $CTID --nameserver NAMESERVER_IP --save


Install centos-5-release packages[edit]

Use vzctl exec to execute the rpm install command on the container: 

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

Note: centos-release-5 depends on notes-package, start with that one.

Backup dev[edit]

Backup the container /dev/ directory, as initscripts needs udev and will remove vzdev you'll need the backup: 

tar -cf $CTID.dev.tar -C /vz/private/$CTID dev

Install initscripts package[edit]

Install initscripts package (forced and with no deps), as per below: 

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

Note: If the "transfer failed", go to the CentOS5 mirror and find the latest initscripts rpm and use that instead.

Update conf file[edit]

Edit /etc/vz/conf/$CSID.conf and replace 

OSTEMPLATE="centos-4-i386-minimal"

with 

OSTEMPLATE="centos-5-i386-minimal"

Alternatively, use the 'sed' command to replace it: 

sed -i 's#OSTEMPLATE="centos-4#OSTEMPLATE="centos-5#g' /etc/vz/conf/$CTID.conf

Copy existing template[edit]

Copy existing template from: 

/vz/template/centos/4

to 

/vz/template/centos/5

Update yum.conf[edit]

In /vz/template/centos/5/i386/config/yum.conf change mirrors to CentOS 5

Using sed: 

sed -i 's#centos4#centos5#g' /vz/template/centos/5/i386/config/yum.conf
sed -i 's#CentOS 4#CentOS 5#g' /vz/template/centos/5/i386/config/yum.conf
sed -i 's#centos/4/#centos/5/#g' /vz/template/centos/5/i386/config/yum.conf

Upgrade container packages[edit]

db-version will complain, so delete the conflicting database first: 

rm -fr /vz/root/$CTID/var/lib/rpm/__*

Now run vzyum to upgrade the contain packages: 

vzyum $CTID upgrade

Troubleshooting[edit]

If you get this error: 

Error: Missing Dependency: python-abi = 2.3 is needed by package python-elementtree

and/or 

warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID e8562897
Public key for libsepol-1.15.2-3.el5.i386.rpm is not installed

You need to run the following before trying again: 

vzctl exec $CTID rpm -e --justdb python-elementtree --nodeps
vzctl exec $CTID rpm --import http://mirrors.kernel.org/centos/RPM-GPG-KEY-CentOS-5

Test your VE[edit]

Check you can enter your VE: 

vzctl enter $CTID

All went OK? Exit the VE: 

exit

Troubleshooting[edit]

Unable to open pty: No such file or directory

If you see errors like this, see the VPS_enter_failed article.

Stop your VE[edit]

vzctl stop $CTID

Restore dev[edit]

This will replace the new /dev/ with the old one: 

mv /vz/private/$CTID/dev /vz/private/$CTID/dev.old
tar -xvf $CTID.dev.tar -C /vz/private/$CTID

Remove container IP[edit]

vzctl set $CTID --ipdel all --save

Create the template[edit]

cd /vz/private/$CTID
tar --numeric-owner -zcf /vz/template/cache/centos-5.5-i386-minimal.tar.gz .
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