centos2ol
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CentOS 8.3 to Oracle Linux failed conversion on OpenVZ 7 VPS
On OpenVZ 7 VPS, the centos2ol.sh script will fail with below output for dracut: Cannot find module directory /lib/modules/4.18.0/
virt-what
openvz
lxc
bash centos2ol.sh | tee centos2ol.log
Checking for required packages...
Checking your distribution...
Checking for yum lock...
Checking for required python packages...
Finding your repository directory...
Looking for yumdownloader...
Backing up and removing old repository files...
Downloading Oracle Linux release package...
Oracle Linux 8 BaseOS Latest (x86_64) 35 MB/s | 27 MB 00:00
Oracle Linux 8 Application Stream (x86_64) 32 MB/s | 21 MB 00:00
Latest Unbreakable Enterprise Kernel Release 6 22 MB/s | 11 MB 00:00
Last metadata expiration check: 0:00:02 ago on Sat Dec 12 06:41:14 2020.
(1/3): oraclelinux-release-el8-1.0-14.el8.x86_6 185 kB/s | 18 kB 00:00
(2/3): redhat-release-8.3-1.0.0.1.el8.x86_64.rp 167 kB/s | 17 kB 00:00
(3/3): oraclelinux-release-8.3-1.0.4.el8.x86_64 513 kB/s | 71 kB 00:00
Switching old release package with Oracle Linux...
warning: oraclelinux-release-8.3-1.0.4.el8.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID ad986da3: NOKEY
warning: file /etc/yum.repos.d/CentOS-Linux-Sources.repo: remove failed: No such file or directory
warning: file /etc/yum.repos.d/CentOS-Linux-PowerTools.repo: remove failed: No such file or directory
warning: file /etc/yum.repos.d/CentOS-Linux-Plus.repo: remove failed: No such file or directory
warning: file /etc/yum.repos.d/CentOS-Linux-Media.repo: remove failed: No such file or directory
warning: file /etc/yum.repos.d/CentOS-Linux-HighAvailability.repo: remove failed: No such file or directory
warning: file /etc/yum.repos.d/CentOS-Linux-FastTrack.repo: remove failed: No such file or directory
warning: file /etc/yum.repos.d/CentOS-Linux-Extras.repo: remove failed: No such file or directory
warning: file /etc/yum.repos.d/CentOS-Linux-Devel.repo: remove failed: No such file or directory
warning: file /etc/yum.repos.d/CentOS-Linux-Debuginfo.repo: remove failed: No such file or directory
warning: file /etc/yum.repos.d/CentOS-Linux-ContinuousRelease.repo: remove failed: No such file or directory
warning: file /etc/yum.repos.d/CentOS-Linux-BaseOS.repo: remove failed: No such file or directory
warning: file /etc/yum.repos.d/CentOS-Linux-AppStream.repo: remove failed: No such file or directory
Installing base packages for Oracle Linux...
Last metadata expiration check: 0:00:06 ago on Sat Dec 12 06:41:14 2020.
> No match for argument: centos-backgrounds
No match for argument: centos-logos
No match for argument: centos-release-cr
No match for argument: desktop-backgrounds-basic
No match for argument: libreport-centos
No match for argument: libreport-plugin-mantisbt
No match for argument: libreport-plugin-rhtsupport
No match for argument: python3-syspurpose
No match for argument: python-oauth
No match for argument: sl-logos
No match for argument: yum-rhn-plugin
> Package basesystem-11-5.el8.noarch is already installed.
Package initscripts-10.00.9-1.el8.x86_64 is already installed.
Package grubby-8.40-41.el8.x86_64 is already installed.
> ===========================================================================================
Package Arch Version Repository Size
===========================================================================================
Installing:
grub2-pc x86_64 1:2.02-90.0.1.el8 ol8_baseos_latest 40 k
kernel-uek x86_64 5.4.17-2036.100.6.1.el8uek ol8_UEKR6 61 M
oracle-logos x86_64 80.5-1.0.6.el8 ol8_baseos_latest 1.4 M
plymouth x86_64 0.9.4-7.20200615git1e36e30.0.1.el8 ol8_appstream 127 k
Upgrading:
grub2-common noarch 1:2.02-90.0.1.el8 ol8_baseos_latest 885 k
grub2-tools x86_64 1:2.02-90.0.1.el8 ol8_baseos_latest 2.0 M
grub2-tools-minimal x86_64 1:2.02-90.0.1.el8 ol8_baseos_latest 205 k
grubby x86_64 8.40-41.0.1.el8 ol8_baseos_latest 50 k
Installing dependencies:
freetype x86_64 2.9.1-4.el8_3.1 ol8_baseos_latest 394 k
grub2-pc-modules noarch 1:2.02-90.0.1.el8 ol8_baseos_latest 869 k
grub2-tools-efi x86_64 1:2.02-90.0.1.el8 ol8_baseos_latest 470 k
grub2-tools-extra x86_64 1:2.02-90.0.1.el8 ol8_baseos_latest 1.1 M
libpng x86_64 2:1.6.34-5.el8 ol8_baseos_latest 126 k
linux-firmware noarch 999:20200902-999.5.gitd5f9eea5.el8 ol8_baseos_latest 122 M
numactl-libs x86_64 2.0.12-11.el8 ol8_baseos_latest 36 k
plymouth-core-libs x86_64 0.9.4-7.20200615git1e36e30.0.1.el8 ol8_appstream 122 k
plymouth-scripts x86_64 0.9.4-7.20200615git1e36e30.0.1.el8 ol8_appstream 44 k
Removing:
centos-linux-release noarch 8.3-1.2011.el8 @BaseOS 25 k
Transaction Summary
===========================================================================================
Install 13 Packages
Upgrade 4 Packages
Remove 1 Package
Total download size: 191 M
Downloading Packages:
(1/17): libpng-1.6.34-5.el8.x86_64.rpm 689 kB/s | 126 kB 00:00
(2/17): grub2-pc-2.02-90.0.1.el8.x86_64.rpm 1.2 MB/s | 40 kB 00:00
(3/17): oracle-logos-80.5-1.0.6.el8.x86_64.rpm 5.2 MB/s | 1.4 MB 00:00
(4/17): numactl-libs-2.0.12-11.el8.x86_64.rpm 1.3 MB/s | 36 kB 00:00
(5/17): grub2-tools-efi-2.02-90.0.1.el8.x86_64. 6.2 MB/s | 470 kB 00:00
(6/17): grub2-tools-extra-2.02-90.0.1.el8.x86_6 6.1 MB/s | 1.1 MB 00:00
(7/17): grub2-pc-modules-2.02-90.0.1.el8.noarch 8.6 MB/s | 869 kB 00:00
(8/17): plymouth-scripts-0.9.4-7.20200615git1e3 1.5 MB/s | 44 kB 00:00
(9/17): plymouth-0.9.4-7.20200615git1e36e30.0.1 4.4 MB/s | 127 kB 00:00
(10/17): freetype-2.9.1-4.el8_3.1.x86_64.rpm 2.5 MB/s | 394 kB 00:00
(11/17): plymouth-core-libs-0.9.4-7.20200615git 4.1 MB/s | 122 kB 00:00
(12/17): grubby-8.40-41.0.1.el8.x86_64.rpm 1.8 MB/s | 50 kB 00:00
(13/17): grub2-common-2.02-90.0.1.el8.noarch.rp 4.2 MB/s | 885 kB 00:00
(14/17): grub2-tools-2.02-90.0.1.el8.x86_64.rpm 15 MB/s | 2.0 MB 00:00
(15/17): grub2-tools-minimal-2.02-90.0.1.el8.x8 2.3 MB/s | 205 kB 00:00
(16/17): kernel-uek-5.4.17-2036.100.6.1.el8uek. 41 MB/s | 61 MB 00:01
(17/17): linux-firmware-20200902-999.5.gitd5f9e 43 MB/s | 122 MB 00:02
--------------------------------------------------------------------------------
Total 67 MB/s | 191 MB 00:02
warning: /var/cache/dnf/ol8_baseos_latest-e4c6155830ad002c/packages/libpng-1.6.34-5.el8.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID ad986da3: NOKEY
Oracle Linux 8 BaseOS Latest (x86_64) 3.0 MB/s | 3.1 kB 00:00
Importing GPG key 0xAD986DA3:
Userid : "Oracle OSS group (Open Source Software group) <[email protected]>"
Fingerprint: 76FD 3DB1 3AB6 7410 B89D B10E 8256 2EA9 AD98 6DA3
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
Key imported successfully
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Running scriptlet: grub2-common-1:2.02-90.0.1.el8.noarch 1/1
Upgrading : grub2-common-1:2.02-90.0.1.el8.noarch 1/22
Upgrading : grub2-tools-minimal-1:2.02-90.0.1.el8.x86_64 2/22
Running scriptlet: grub2-tools-1:2.02-90.0.1.el8.x86_64 3/22
Upgrading : grub2-tools-1:2.02-90.0.1.el8.x86_64 3/22
Running scriptlet: grub2-tools-1:2.02-90.0.1.el8.x86_64 3/22
Installing : grub2-pc-modules-1:2.02-90.0.1.el8.noarch 4/22
Installing : plymouth-core-libs-0.9.4-7.20200615git1e36e30.0.1. 5/22
Running scriptlet: plymouth-core-libs-0.9.4-7.20200615git1e36e30.0.1. 5/22
Installing : plymouth-scripts-0.9.4-7.20200615git1e36e30.0.1.el 6/22
Installing : plymouth-0.9.4-7.20200615git1e36e30.0.1.el8.x86_64 7/22
Installing : numactl-libs-2.0.12-11.el8.x86_64 8/22
Running scriptlet: numactl-libs-2.0.12-11.el8.x86_64 8/22
Installing : linux-firmware-999:20200902-999.5.gitd5f9eea5.el8. 9/22
Installing : libpng-2:1.6.34-5.el8.x86_64 10/22
Installing : freetype-2.9.1-4.el8_3.1.x86_64 11/22
Installing : grub2-tools-extra-1:2.02-90.0.1.el8.x86_64 12/22
Installing : grub2-pc-1:2.02-90.0.1.el8.x86_64 13/22
Running scriptlet: kernel-uek-5.4.17-2036.100.6.1.el8uek.x86_64 14/22
Installing : kernel-uek-5.4.17-2036.100.6.1.el8uek.x86_64 14/22
Running scriptlet: kernel-uek-5.4.17-2036.100.6.1.el8uek.x86_64 14/22
Upgrading : grubby-8.40-41.0.1.el8.x86_64 15/22
Installing : grub2-tools-efi-1:2.02-90.0.1.el8.x86_64 16/22
Installing : oracle-logos-80.5-1.0.6.el8.x86_64 17/22
Running scriptlet: oracle-logos-80.5-1.0.6.el8.x86_64 17/22
Cleanup : grubby-8.40-41.el8.x86_64 18/22
Erasing : centos-linux-release-8.3-1.2011.el8.noarch 19/22
Running scriptlet: grub2-tools-1:2.02-90.el8.x86_64 20/22
Cleanup : grub2-tools-1:2.02-90.el8.x86_64 20/22
Cleanup : grub2-tools-minimal-1:2.02-90.el8.x86_64 21/22
Cleanup : grub2-common-1:2.02-90.el8.noarch 22/22
Running scriptlet: kernel-uek-5.4.17-2036.100.6.1.el8uek.x86_64 22/22
Running scriptlet: oracle-logos-80.5-1.0.6.el8.x86_64 22/22
Running scriptlet: grub2-common-1:2.02-90.el8.noarch 22/22
Verifying : libpng-2:1.6.34-5.el8.x86_64 1/22
Verifying : oracle-logos-80.5-1.0.6.el8.x86_64 2/22
Verifying : linux-firmware-999:20200902-999.5.gitd5f9eea5.el8. 3/22
Verifying : grub2-pc-1:2.02-90.0.1.el8.x86_64 4/22
Verifying : grub2-tools-extra-1:2.02-90.0.1.el8.x86_64 5/22
Verifying : numactl-libs-2.0.12-11.el8.x86_64 6/22
Verifying : grub2-tools-efi-1:2.02-90.0.1.el8.x86_64 7/22
Verifying : grub2-pc-modules-1:2.02-90.0.1.el8.noarch 8/22
Verifying : freetype-2.9.1-4.el8_3.1.x86_64 9/22
Verifying : plymouth-scripts-0.9.4-7.20200615git1e36e30.0.1.el 10/22
Verifying : plymouth-0.9.4-7.20200615git1e36e30.0.1.el8.x86_64 11/22
Verifying : plymouth-core-libs-0.9.4-7.20200615git1e36e30.0.1. 12/22
Verifying : kernel-uek-5.4.17-2036.100.6.1.el8uek.x86_64 13/22
Verifying : grubby-8.40-41.0.1.el8.x86_64 14/22
Verifying : grubby-8.40-41.el8.x86_64 15/22
Verifying : grub2-common-1:2.02-90.0.1.el8.noarch 16/22
Verifying : grub2-common-1:2.02-90.el8.noarch 17/22
Verifying : grub2-tools-1:2.02-90.0.1.el8.x86_64 18/22
Verifying : grub2-tools-1:2.02-90.el8.x86_64 19/22
Verifying : grub2-tools-minimal-1:2.02-90.0.1.el8.x86_64 20/22
Verifying : grub2-tools-minimal-1:2.02-90.el8.x86_64 21/22
Verifying : centos-linux-release-8.3-1.2011.el8.noarch 22/22
Upgraded:
grub2-common-1:2.02-90.0.1.el8.noarch
grub2-tools-1:2.02-90.0.1.el8.x86_64
grub2-tools-minimal-1:2.02-90.0.1.el8.x86_64
grubby-8.40-41.0.1.el8.x86_64
Installed:
freetype-2.9.1-4.el8_3.1.x86_64
grub2-pc-1:2.02-90.0.1.el8.x86_64
grub2-pc-modules-1:2.02-90.0.1.el8.noarch
grub2-tools-efi-1:2.02-90.0.1.el8.x86_64
grub2-tools-extra-1:2.02-90.0.1.el8.x86_64
kernel-uek-5.4.17-2036.100.6.1.el8uek.x86_64
libpng-2:1.6.34-5.el8.x86_64
linux-firmware-999:20200902-999.5.gitd5f9eea5.el8.noarch
numactl-libs-2.0.12-11.el8.x86_64
oracle-logos-80.5-1.0.6.el8.x86_64
plymouth-0.9.4-7.20200615git1e36e30.0.1.el8.x86_64
plymouth-core-libs-0.9.4-7.20200615git1e36e30.0.1.el8.x86_64
plymouth-scripts-0.9.4-7.20200615git1e36e30.0.1.el8.x86_64
Removed:
centos-linux-release-8.3-1.2011.el8.noarch
Complete!
Last metadata expiration check: 0:00:51 ago on Sat Dec 12 06:41:14 2020.
> Leaving Shell
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'yum clean packages'.
Updating initrd...
dracut: Cannot find module directory /lib/modules/4.18.0/
dracut: and --no-kernel was not specified
Can you confirm whether you're running a CentOS 8 VM or container on OpenVZ? In fact, if you could share the prlctl commands you used to create the instance, that would be very helpful. I've never used OpenVZ before, so any info you can provide to overcome the learning curve would be appreciated!
I am not the one managing the OpenVZ VPS host node. I just rented a OpenVZ VPS from https://hostus.us/openvz-vps.html with CentOS 8 image out of the box and then ran yum update to get to CentOS 8.3 and then ran cento2ol.sh script. OpenVZ VPS use the Kernel from the host node unlike KVM/non-OpenVZ virtualized VPS servers https://hostus.us/openvz-vs-kvm.html.
OpenVZ uses a common shared kernel. Because of the shared kernel, overhead is lower and so is RAM consumption per VPS. A disadvantage to OpenVZ would be that a kernel failure could cause a failure across all VPS instances running on the same server. The shared kernel limits the operating systems you can run and keep in mind, the latest OSes with newer kernels may not work under OpenVZ.
Just quickest way to test is just rent a OpenVZ VPS and choose CentOS 8 as the out of the box image from say https://hostus.us/openvz-vs-kvm.html or another OpenVZ provider.
For scripting in centos2ol.sh you could use output from virt-what to determine if the server environment is openvz/lxc based in which case the host node's Kernel is used
On Hostus.US's OpenVZ VPS, output is
virt-what
openvz
lxc
On KVM server it would output = kvm and dedicated would have empty output
- OpenVZ 6 would use shared 2.6.32 Kernel
- OpenVZ 7 would use shared 4.18 Kernel or whatever OpenVZ 7 host node has
Gotcha. The script (currently) assumes its running on an instance with a dedicated kernel. We hadn't considered switching a container because it would generally be easier just to recreate one. But that ignores the VPS use case.
Can you confirm that your instance is switched and still works? As there is no kernel, the dracut error should have been purely cosmetic.
Oh hadn't checked as I reinstalled CentOS 8 again as I assumed the conversion wasn't complete or was it complete and just dracut error can be ignored ?
Hopefully the latter, given dracut isn't needed in this scenario and it's the last thing the script does.
It's not a fix, but we've added specific docs around the need to be using a CentOS kernel (for now).
Thanks @Djelibeybi for the update. You could add to centos2ol.sh a check for output from virt-what to see if lxc/openvz is detected to abort the script with a notice before it goes too far in the process?
Yes, that's the longer-term plan, which requires access to a testing environment and unfortunately we can't just rent third-party OpenVZ based instances, because it would all have to go through procurement, etc. I'm still working on getting a local install of OpenVZ running so I can test on that.