Category Archives: Virtualization

Convert OpenVZ to LXC

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Convert OpenVZ VM to LXC VM

Install same version lxc OS
lxc launch ubuntu:20.04 lxc-server
lxc stop lxc-server

rm -rf /var/snap/lxd/common/lxd/storage-pools/default/containers/lxc-server/rootfs
mkdir /var/snap/lxd/common/lxd/storage-pools/default/containers/lxc-server/rootfs

On Ubuntu 20.04 OpenVZ VM run:
rsync -avz -e ssh --exclude=etc/inittab --exclude=etc/network/interfaces --exclude=dev/ --exclude=sys/ --exclude=proc/ / [email protected]:/var/snap/lxd/common/lxd/storage-pools/default/containers/lxc-server/rootfs/

vim /var/snap/lxd/common/lxd/storage-pools/default/containers/lxc-server/rootfs/etc/network/interfaces
auto lo
iface lo inet loopback
source /etc/network/interfaces.d/*.cfg

mkdir /var/snap/lxd/common/lxd/storage-pools/default/containers/lxc-server/rootfs/etc/network/interfaces.d/
vim /var/snap/lxd/common/lxd/storage-pools/default/containers/lxc-server/rootfs/etc/network/interfaces.d/eth0.cfg
# The primary network interface
auto eth0
iface eth0 inet dhcp

lxc start lxc-server

For sure you need to stop MySQL/PostgreSQL before rsync or if huge database you can resync database after syncing data from OpenVZ server

Error: /usr/bin/apt-get failed, exitcode=100

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Downloading packages
Failed to register the CT: PRL_ERR_VZCTL_OPERATION_FAILED (Details: Creating OS template cache for ubuntu-20.04-x86_64 template

tune2fs 1.42.9 (28-Dec-2013)
Setting maximal mount count to -1
Setting error behavior to 2
Setting interval between checks to 0 seconds
E: Unable to determine a suitable packaging system type
Error: /usr/bin/apt-get failed, exitcode=100
Error: Failed to umount ploop image /vz/tmp//vzpkg.2WxExF/cache-private/root.hdd: Error in ploop_umount_image (ploop.c:2804): Image /vz/tmp/vzpkg.2WxExF/cache-private/root.hdd/root.hds is not mounted 40
VE_PRIVATE is not set
Creation of Container private area failed

service vz restart

docker detach from running container

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To detach the tty without exiting the shell, use the escape sequence Ctrl+P followed by Ctrl+Q. More details here.

Additional info from this source:

docker run -t -i → can be detached with ^P^Qand reattached with docker attach
docker run -i → cannot be detached with ^P^Q; will disrupt stdin
docker run → cannot be detached with ^P^Q; can SIGKILL client; can reattach with docker attach

podman read logs

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sudo podman run --name web1 -dt -p 80:80 docker.io/library/httpd httpd -D FOREGROUND
bf5a2456f8f7e878405097402fe3ed32eb6f9e7b677ac09df1cce841cd7bf527

links -dump http://localhost
It works!

sudo podman container logs -f web1
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 10.88.0.33. Set the 'ServerName' directive globally to suppress this message
AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 10.88.0.33. Set the 'ServerName' directive globally to suppress this message
[Mon Aug 17 20:32:18.221008 2020] [mpm_event:notice] [pid 1:tid 139846430241920] AH00489: Apache/2.4.46 (Unix) configured -- resuming normal operations
[Mon Aug 17 20:32:18.221243 2020] [core:notice] [pid 1:tid 139846430241920] AH00094: Command line: 'httpd -D FOREGROUND'
10.88.0.1 - - [17/Aug/2020:20:32:45 +0000] "GET / HTTP/1.1" 304 -
10.88.0.1 - - [17/Aug/2020:20:32:45 +0000] "GET / HTTP/1.1" 304 -
10.88.0.1 - - [17/Aug/2020:20:32:48 +0000] "GET / HTTP/1.1" 304 -

add container to pod

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sudo podman pod create
4d03c9f1ef5f8f944cb61d598084a1191802694e59e7438b36e1dfecdaa04fe3

sudo podman ps -a --pod
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES POD ID PODNAME
e14f13b36519 k8s.gcr.io/pause:3.2 About a minute ago Created 4d03c9f1ef5f-infra 4d03c9f1ef5f loving_northcutt

sudo podman run -dt --pod loving_northcutt docker.io/library/alpine:latest top

sudo podman ps -a --pod
269ea28c6217 docker.io/library/alpine:latest top 14 seconds ago Up 14 seconds ago strange_hertz 4d03c9f1ef5f loving_northcutt
e14f13b36519 k8s.gcr.io/pause:3.2 3 minutes ago Up 14 seconds ago 4d03c9f1ef5f-infra 4d03c9f1ef5f loving_northcutt

sudo podman pod ps
POD ID NAME STATUS CREATED # OF CONTAINERS INFRA ID
4d03c9f1ef5f loving_northcutt Running 6 minutes ago 2 e14f13b36519

2 containers, it like array for containers

Failed to register the CT: PRL_ERR_VZCTL_OPERATION_FAIL

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Failed to register the CT: PRL_ERR_VZCTL_OPERATION_FAILED (Details: Creating OS template cache for centos-8-x86_64 template
Can’t open /proc/sys/kernel/virt_osrelease: No such file or directory
Error: /usr/share/vzyum/bin/yum failed, exitcode=1
VE_PRIVATE is not set
Creation of Container private area failed

Make sure you are using vz7 kernel:
uname -a | grep vz7
Linux CentOS-78-64-minimal 3.10.0-1127.8.2.vz7.151.14 #1 SMP Tue Jun 9 12:58:54 MSK 2020 x86_64 x86_64 x86_64 GNU/Linux