User:Ncopa/migrate-vserver-to-lxc - Revision history

Ncopa: rename old vserver after last data sync happened

2013-10-18T08:30:00Z

rename old vserver after last data sync happened

← Older revision		Revision as of 08:30, 18 October 2013
Line 54:		Line 54:
	After data is copied we shut down the old vserver. This is on old Vserver host.		After data is copied we shut down the old vserver. This is on old Vserver host.
	{{cmd\|vserver build-edge stop}}		{{cmd\|vserver build-edge stop}}

			=== Mirror data again ===
			We mirror the changes on the powered off vserver once again so we get the changes that happened after first data copy started. This is done from vserver host here.
			{{cmd\|rsync --partial --delete --numeric-ids -rva /vservers/build-edge/* bld1.alpinelinux.org:/var/lib/lxc/build-ege-x86/rootfs/}}

	We rename the vserver so its not started/copied by mistake.		We rename the vserver so its not started/copied by mistake.
Line 60:		Line 64:
	We unmark the auto-start.		We unmark the auto-start.
	{{cmd\|rm /etc/vservers/build-edge/apps/init/mark}}		{{cmd\|rm /etc/vservers/build-edge/apps/init/mark}}

	~~=== Mirror data again ===~~
	~~We mirror the changes on the powered off vserver once again so we get the changes that happened after first data copy started. This is done from vserver host here.~~
	~~{{cmd\|rsync --partial --delete --numeric-ids -rva /vservers/build-edge/* bld1.alpinelinux.org:/var/lib/lxc/build-ege-x86/rootfs/}}~~

	=== Prepare lxcontainer for startup ===		=== Prepare lxcontainer for startup ===

Ncopa at 07:42, 18 October 2013

2013-10-18T07:42:46Z

← Older revision		Revision as of 07:42, 18 October 2013
Line 8:		Line 8:

	== Migration steps ==		== Migration steps ==
	Here follows some step by step. ~~In this example we will move (and rename) build-edge@build.alpinelinux.org to~~ build-edge-x86~~@bld1.alpinelinux.org~~.		Here follows some step by step. build-edge-x86 is used as example.

	=== Create container ===		=== Create container ===
Line 41:		Line 41:
	auto eth0		auto eth0
	iface eth0 inet static		iface eth0 inet static
	address 91.~~220~~.88.23		address 1.2.3.4
	netmask 255.255.255.~~128~~		netmask 255.255.255.248
	gateway 91.~~220~~.88.1		gateway 1.2.3.1

	auto eth1		auto eth1
	iface eth1 inet static		iface eth1 inet static
	address 192.168.8.4		address 192.168.0.4
	netmask 255.255.255.0		netmask 255.255.255.0
	</nowiki>}}		</nowiki>}}
Line 76:		Line 76:

	TODO: send GARP to tell switch of new ip.		TODO: send GARP to tell switch of new ip.

	~~=== Start up container ===~~
	~~Make it autostart.~~
	~~{{cmd\|ln -s lxc /etc/init.d/lxc.build-edge-x86}}~~

	~~Now its time to start up container.~~
	~~{{cmd\|/etc/init.d/lxc.build-edge-x86 start}}~~

	~~=== Verify that it works ===~~
	~~Ping it. check that services are running and working.~~

	Possible issues can come from switch not yet picking up that ip addr has moved to new mac addr. [http://www.cyberciti.biz/faq/linux-networking-sending-gratuitous-arps/ GARP] can be used to resolve that.

Ncopa: /* Migration steps */

2013-10-18T07:39:57Z

Migration steps

← Older revision		Revision as of 07:39, 18 October 2013
Line 8:		Line 8:

	== Migration steps ==		== Migration steps ==
	Here follows some step by step. build-edge-x86 ~~is used as example~~.		Here follows some step by step. In this example we will move (and rename) build-edge@build.alpinelinux.org to build-edge-x86@bld1.alpinelinux.org.

	=== Create container ===		=== Create container ===

Ncopa: /* Verify that it works */

2013-10-18T07:38:13Z

Verify that it works

← Older revision		Revision as of 07:38, 18 October 2013
Line 85:		Line 85:

	=== Verify that it works ===		=== Verify that it works ===
	Ping it. check that ~~servers~~ are running.		Ping it. check that services are running and working.

			Possible issues can come from switch not yet picking up that ip addr has moved to new mac addr. [http://www.cyberciti.biz/faq/linux-networking-sending-gratuitous-arps/ GARP] can be used to resolve that.

Ncopa at 07:36, 18 October 2013

2013-10-18T07:36:22Z

← Older revision		Revision as of 07:36, 18 October 2013
Line 76:		Line 76:

	TODO: send GARP to tell switch of new ip.		TODO: send GARP to tell switch of new ip.

			=== Start up container ===
			Make it autostart.
			{{cmd\|ln -s lxc /etc/init.d/lxc.build-edge-x86}}

			Now its time to start up container.
			{{cmd\|/etc/init.d/lxc.build-edge-x86 start}}

			=== Verify that it works ===
			Ping it. check that servers are running.

Ncopa at 07:33, 18 October 2013

2013-10-18T07:33:26Z

@@ Line 52: / Line 52: @@
 === Shut down old vserver ===
-After data is copied we shut down the old vserver.
+After data is copied we shut down the old vserver. This is on old Vserver host.
 {{cmd|vserver build-edge stop}}
 === Mirror data again ===
-We mirror the changes on the powered off vserver once again so we get the changes that happened after first data copy started. This should go fast.
+We mirror the changes on the powered off vserver once again so we get the changes that happened after first data copy started. This is done from vserver host here.
 {{cmd|rsync --partial --delete --numeric-ids -rva /vservers/build-edge/* bld1.alpinelinux.org:/var/lib/lxc/build-ege-x86/rootfs/}}

Ncopa: /* Mirror data again */

2013-10-18T07:22:51Z

Mirror data again

← Older revision		Revision as of 07:22, 18 October 2013
Line 57:		Line 57:
	=== Mirror data again ===		=== Mirror data again ===
	We mirror the changes on the powered off vserver once again so we get the changes that happened after first data copy started. This should go fast.		We mirror the changes on the powered off vserver once again so we get the changes that happened after first data copy started. This should go fast.
			{{cmd\|rsync --partial --delete --numeric-ids -rva /vservers/build-edge/* bld1.alpinelinux.org:/var/lib/lxc/build-ege-x86/rootfs/}}

Ncopa: /* Configure networking */

2013-10-18T07:22:13Z

Configure networking

← Older revision		Revision as of 07:22, 18 October 2013
Line 50:		Line 50:
	netmask 255.255.255.0		netmask 255.255.255.0
	</nowiki>}}		</nowiki>}}

			=== Shut down old vserver ===
			After data is copied we shut down the old vserver.
			{{cmd\|vserver build-edge stop}}

			=== Mirror data again ===
			We mirror the changes on the powered off vserver once again so we get the changes that happened after first data copy started. This should go fast.

Ncopa: add network config

2013-10-18T07:18:13Z

add network config

@@ Line 2: / Line 2: @@
 Its fairly straightforward. Basically, the only thing that differs is:
-* /etc/inittab
+* {{path|/etc/inittab}}
-* /etc/network/interfaces
+* {{path|/etc/network/interfaces}}
 On vserver the host sets up the network, on LXC the container needs to do it itself.
@@ Line 21: / Line 21: @@
 Use rsync to mirror the vserver. We do this before we shut down the vserver guest to keep downtime as low as possible. In this example we rsync from the vserver host:
 {{cmd|rsync --partial --delete --numeric-ids -rva /vservers/build-edge/* bld1.alpinelinux.org:/var/lib/lxc/build-ege-x86/rootfs/}}

Ncopa: initial

2013-10-18T07:09:07Z

initial

New page

Some notes on how to migrate an Alpine Linux vserver to an lxcontainer.

Its fairly straightforward. Basically, the only thing that differs is:
* /etc/inittab
* /etc/network/interfaces

On vserver the host sets up the network, on LXC the container needs to do it itself.

== Migration steps ==
Here follows some step by step. build-edge-x86 is used as example.

=== Create container ===
Create the new container on the LXC host
{{cmd|lxc-create -n build-edge-x86 -t alpine -- --release edge --arch x86}}

=== Backup inittab ===
Make a copy of the inittab to a location outside the container rootfs.
{{cmd|cp /var/lib/lxc/build-edge-x86/rootfs/etc/inittab /var/lib/lxc/build-edge-x86/}}

=== Copy data ===
Use rsync to mirror the vserver. We do this before we shut down the vserver guest to keep downtime as low as possible. In this example we rsync from the vserver host:
{{cmd|rsync --partial --delete --numeric-ids -rva /vservers/build-edge/* bld1.alpinelinux.org:/var/lib/lxc/build-ege-x86/rootfs/}}