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

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(→‎Update conf file: code->pre)
(improved tar based backup/restore)
 
(15 intermediate revisions by 2 users not shown)
Line 6: Line 6:
 
follow these steps:
 
follow these steps:
  
−
==Create a container using centos-4-i386-minimal and set a valid nameserver==
+
==Create the container==
 +
 
 +
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
Line 12: Line 14:
 
</pre>
 
</pre>
  
−
== Enter container ==
+
 
 +
==Install centos-5-release packages==
 +
Use <code>vzctl exec</code> to execute the rpm install command on the container:
 +
 
 
<pre>
 
<pre>
−
vzctl enter $CTID
+
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.
  
−
==Install centos-5-release packages==
+
==Backup dev==
−
 
 
−
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.i386.rpm
 
  
−
Note: centos-release-5 depends on notes-package, start with that one.
+
Backup the container /dev/ directory, as initscripts needs udev and will remove vzdev you'll need the backup:
  
−
==Backup your /dev/, since initscripts need udev and will remove vzdev you'll net the backup==
 
 
<pre>
 
<pre>
−
tar -cf dev.tar ./dev
+
tar -cf $CTID.dev.tar -C /vz/private/$CTID dev
 
</pre>
 
</pre>
  
−
==Install initscripts package (forced and with no deps)==
+
==Install initscripts package==
 +
 
 +
Install initscripts package (forced and with no deps), as per below:
  
 
<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==
Line 55: Line 54:
 
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>
  
−
==Copy existing template from==
+
==Copy existing template==
 +
 
 +
Copy existing template from:
 +
 
 
<pre>
 
<pre>
 
/vz/template/centos/4
 
/vz/template/centos/4
Line 67: Line 69:
 
</pre>
 
</pre>
  
−
==In /vz/template/centos/4/i386/config/yum.conf change mirrors to CentOS 5==
+
==Update yum.conf==
 +
 
 +
In /vz/template/centos/5/i386/config/yum.conf change mirrors to CentOS 5
 +
 
 +
Using sed:
 +
 
 +
<pre>
 +
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
 +
</pre>
 +
 
 +
==Upgrade container packages==
 +
 
 +
db-version will complain, so delete the conflicting database first:
 +
<pre>
 +
rm -fr /vz/root/$CTID/var/lib/rpm/__*
 +
</pre>
  
−
==Upgrade container packages using vzyum (32bit only)==
+
Now run vzyum to upgrade the contain packages:
 
<pre>
 
<pre>
 
vzyum $CTID upgrade
 
vzyum $CTID upgrade
 
</pre>
 
</pre>
−
Note: If yum db-version complains do "rm /vz/root/VZNUM/var/lib/rpm/__*" to delete conflicting db.
 
  
−
==Stop your VE==
+
===Troubleshooting===
 +
 
 +
If you get this error:
 +
 
 
<pre>
 
<pre>
−
vzctl stop $CTID
+
Error: Missing Dependency: python-abi = 2.3 is needed by package python-elementtree
 
</pre>
 
</pre>
  
−
==Replace the new /dev/ with the old one==
+
and/or
 
<pre>
 
<pre>
−
cd /vz/private/$CTID
+
warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID e8562897
−
rm -rf dev
+
Public key for libsepol-1.15.2-3.el5.i386.rpm is not installed
−
tar -xvf dev.tar
 
 
</pre>
 
</pre>
  
−
==Leave the container private dir (or it will not start)==
+
You need to run the following before trying again:
 +
 
 
<pre>
 
<pre>
−
cd
+
vzctl exec $CTID rpm -e --justdb python-elementtree --nodeps
 +
vzctl exec $CTID rpm --import http://mirrors.kernel.org/centos/RPM-GPG-KEY-CentOS-5
 
</pre>
 
</pre>
  
−
==Start the container==
+
==Test your VE==
 +
Check you can enter your VE:
 
<pre>
 
<pre>
−
vzctl start $CTID
+
vzctl enter $CTID
 
</pre>
 
</pre>
  
−
==Remove container IP==
+
All went OK? Exit the VE:
 
<pre>
 
<pre>
−
vzctl set $CTID --ipdel all --save
+
exit
 +
</pre>
 +
 
 +
===Troubleshooting===
 +
 
 +
<pre>
 +
Unable to open pty: No such file or directory
 
</pre>
 
</pre>
 +
If you see errors like this, see the [[VPS_enter_failed]] article.
  
−
==Stop container==
+
==Stop your VE==
 
<pre>
 
<pre>
 
vzctl stop $CTID
 
vzctl stop $CTID
 +
</pre>
 +
 +
==Restore dev==
 +
 +
This will replace the new /dev/ with the old one:
 +
<pre>
 +
mv /vz/private/$CTID/dev /vz/private/$CTID/dev.old
 +
tar -xvf $CTID.dev.tar -C /vz/private/$CTID
 +
</pre>
 +
 +
== Remove container IP ==
 +
<pre>
 +
vzctl set $CTID --ipdel all --save
 
</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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