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To make things easier you may like to first follow the basic instructions elsewhere and create a dummy container based on the same Linux distribution you want to migrate. That way you can take that dummy as a template and then copy to your new migrated container and modify. You can later discard this dummy. | To make things easier you may like to first follow the basic instructions elsewhere and create a dummy container based on the same Linux distribution you want to migrate. That way you can take that dummy as a template and then copy to your new migrated container and modify. You can later discard this dummy. | ||
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== Prepare a new “empty” container == | == Prepare a new “empty” container == | ||
For OpenVZ this would mean the following (assume you chose CT ID of 123): | For OpenVZ this would mean the following (assume you chose CT ID of 123): | ||
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mkdir /vz/root/123 /vz/private/123 | mkdir /vz/root/123 /vz/private/123 | ||
− | cat /etc/vz/conf/ve-basic.conf-sample > /etc/vz/conf/123.conf | + | cat /etc/vz/conf/ve-vps.basic.conf-sample > /etc/vz/conf/123.conf |
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− | + | Hint: Now comes the dummy container handy mentioned above: Simply copy the xxx.conf file of the dummy to your new yyy.conf and modify it. | |
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== Copying the data == | == Copying the data == | ||
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=== rsync === | === rsync === | ||
− | + | rsync example (run from the new HN): | |
− | + | rsync -arvpz --numeric-ids --exclude=/dev --exclude=/proc --exclude=/tmp -e ssh root@a.b.c.d:/ /vz/private/123/ | |
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− | rsync - | ||
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'''Advantage:''' Your system doesn't really go down. | '''Advantage:''' Your system doesn't really go down. | ||
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You have to add <code>OSTEMPLATE=xxx</code> line to <code>/etc/vz/conf/123.conf</code> file, where <code>xxx</code> would be distribution name (like <code>debian-3.0</code>) for vzctl to be able to make changes specific for this distribution. | You have to add <code>OSTEMPLATE=xxx</code> line to <code>/etc/vz/conf/123.conf</code> file, where <code>xxx</code> would be distribution name (like <code>debian-3.0</code>) for vzctl to be able to make changes specific for this distribution. | ||
− | + | If you copied from the dummy container then this step is already accomplished. | |
=== IP address(es) === | === IP address(es) === | ||
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=== /etc/fstab === | === /etc/fstab === | ||
Since you do not have any real disk partitions in a container, /etc/fstab (or most part of it) is no longer needed. Empty it (excluding the lines for <code>/dev/pts</code>, <code>/proc</code>, <code>/sys</code> and such): | Since you do not have any real disk partitions in a container, /etc/fstab (or most part of it) is no longer needed. Empty it (excluding the lines for <code>/dev/pts</code>, <code>/proc</code>, <code>/sys</code> and such): | ||
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mv /vz/private/123/etc/fstab /vz/private/123/etc/fstab.old | mv /vz/private/123/etc/fstab /vz/private/123/etc/fstab.old | ||
egrep '/dev/pts|/dev/shm|/proc|/sys' /vz/private/123/etc/fstab.old > /vz/private/123/etc/fstab | egrep '/dev/pts|/dev/shm|/proc|/sys' /vz/private/123/etc/fstab.old > /vz/private/123/etc/fstab | ||
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You can also mount a devpts in a running (but not fully functional) container: | You can also mount a devpts in a running (but not fully functional) container: | ||
vzctl exec 123 mount -t devpts none /dev/pts | vzctl exec 123 mount -t devpts none /dev/pts | ||
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=== /dev === | === /dev === | ||
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==== Introduction: static /dev ==== | ==== Introduction: static /dev ==== | ||
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Please pay attention to the access permissions of the device files being created: a default file mode for newly created files is affected by <code>umask</code> ([[w:umask]]). You can use --mode option for <code>mknod</code> to set the desired permissions. | Please pay attention to the access permissions of the device files being created: a default file mode for newly created files is affected by <code>umask</code> ([[w:umask]]). You can use --mode option for <code>mknod</code> to set the desired permissions. | ||
− | + | Hint: | |
+ | Now comes the dummy container handy mentioned above: Simply copy the entire /dev directory of the dummy to your new migrated container - worked in my case at least with Debian Etch. | ||
==== tty device nodes ==== | ==== tty device nodes ==== | ||
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===/proc=== | ===/proc=== | ||
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Make sure the /proc directory exists: | Make sure the /proc directory exists: | ||
ls -la /vz/private/123/ | grep proc | ls -la /vz/private/123/ | grep proc | ||
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=== /etc/init.d services === | === /etc/init.d services === | ||
− | Some system services can (or in some cases should) be disabled | + | Some system services can (or in some cases should) be disabled. A few good candidates are: |
* acpid, amd (not needed) | * acpid, amd (not needed) | ||
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* lm_sensors (container does not have access to hardware sensors) | * lm_sensors (container does not have access to hardware sensors) | ||
* microcodectl (container can not update CPU microcode) | * microcodectl (container can not update CPU microcode) | ||
− | * netplugd (container does not have real Ethernet device | + | * netplugd (container does not have real Ethernet device) |
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To see which services are enabled: | To see which services are enabled: | ||
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iface lo inet loopback | iface lo inet loopback | ||
− | iface eth0 inet | + | iface eth0 inet dhcp |
address 10.0.0.4 | address 10.0.0.4 | ||
netmask 255.0.0.0 | netmask 255.0.0.0 | ||
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Now check that everything works fine. If not, see [[#Troubleshooting]] below. | Now check that everything works fine. If not, see [[#Troubleshooting]] below. | ||
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== Troubleshooting == | == Troubleshooting == | ||
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=== Other problems === | === Other problems === | ||
If anything goes wrong, try to find out why and fix. If you have enough Linux experience, it can be handled. Also check out IRC and please report back on this page. | If anything goes wrong, try to find out why and fix. If you have enough Linux experience, it can be handled. Also check out IRC and please report back on this page. | ||
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== Success stories == | == Success stories == | ||
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* Fedora 3 x32 with Plesk -- 23 October 2010 --[[User:Rexwickham|Rex Wickham (2020media.com)]] 13:15, 23 October 2010 (UTC) | * Fedora 3 x32 with Plesk -- 23 October 2010 --[[User:Rexwickham|Rex Wickham (2020media.com)]] 13:15, 23 October 2010 (UTC) | ||
[[Category:HOWTO]] | [[Category:HOWTO]] | ||
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