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Daniel Nashed


First look at CentOS Stream 9

Daniel Nashed  16 October 2021 09:38:44

CentOS Stream is the distribution which will be the next RedHat enterprise version.
RedHat is working on CentOS Stream 9 -- At the same time CentOS Stream 8 continues to be the stable release CentOS 8 used to be.

Updating to major new software versions is not happening inside a code stream.
So when you look into CentOS 7 you see for example a very old major version of OpenSSL.

CentOS 8 is on OpenSSL 1.1.1 -- which is the current version also Domino is using.

Domino is not depending on the OpenSSL version installed, because it installs it's own version into the Domino program directory.
So even on older CentOS version, Domino uses a more current version of OpenSSL-- As long you keep your Domino servers updated!!

Keeping software up to date!
Also other software installs their own version of OpenSSL. And this is often problematic.
Software installing their own version of OpenSSL will not benefit from security patches on OS level!
I have seen some pretty old versions of OpenSSL for some other software!
This is sometimes because admins don't update the software and sometimes also because the vendor bundles a pretty old OpenSSL version!

OpenSSL 3.0

OpenSSL 3.0 just shipped recently with important changes but good compatibility for existing software.
Still there is some work to adopt this new major version! Usually you can't just recompile and you are done.
This will be a major shift of the next version of Linux! So I was very interested to see the current state.

CentOS Stream 9 install on Docker
There are no ISO images for CentOS Stream 9 yet, but they have a Docker image, which makes the installation on an existing machine easier.
I just downloaded the current development Stream 9 version and took a look into the software they use.

You can see some output below from curl that the software is already adopted OpenSSL 3.0.

Looks like this is my new test bed for OpenSSL development now!
Before I have been testing my own application by compiling and installing OpenSSL 3.0 on my CentOS Stream 8 VM.

CentOS Stream 9

On my PhotonOS VM I just ran a new container to get my hands on the latest version.
And quickly checked out the software I am mostly interested in...

docker run -it --rm --name centos-stream9-dev bash


openssl version
OpenSSL 3.0.0 7 sep 2021 (Library: OpenSSL 3.0.0 7 sep 2021)


curl --version
curl 7.76.1 (x86_64-redhat-linux-gnu) libcurl/7.76.1 OpenSSL/3.0.0 zlib/1.2.11 brotli/1.0.9 libidn2/2.3.0 libpsl/0.21.1 (+libidn2/2.3.0) libssh/0.9.6/openssl/zlib nghttp2/1.43.0
Release-Date: 2021-04-14
Protocols: dict file ftp ftps gopher gophers http https imap imaps ldap ldaps mqtt pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS brotli GSS-API HTTP2 HTTPS-proxy IDN IPv6 Kerberos Largefile libz NTLM NTLM_WB PSL SPNEGO SSL TLS-SRP UnixSockets


ldd /usr/sbin/nginx (0x00007ffdbeb80000) => /lib64/ (0x00007fd00445f000) => /lib64/ (0x00007fd0043e7000) => /lib64/ (0x00007fd004342000) => /lib64/ (0x00007fd003f19000) => /lib64/ (0x00007fd003eff000) => /lib64/ (0x00007fd003cf5000)
        /lib64/ (0x00007fd0045ff000)

Domino 12.0.1 Beta 2

Of course Domino 12 isn't supported on a not yet released Linux distribution.
But I gave it a quick try with my new one touch Domino install.
Because I could not find any CentOS Stream 9 ISO yet, I am using PhotonOS 4. which comes with a Linux kernel 5.

The installer correctly detects the version of the kernel and the Linux version, but installs and runs :-)

No this isn't something to try at home. It is just a quick look into the future.
I will keep my eye on the first CentOS Stream 9 ISO images to download and will install a VM for testing. But this is clearly just a preview.

WARNING: Running Domino with a kernel at version 5 has NOT been tested by HCL!
WARNING: The operating system CentOS Stream 9 has NOT been tested by HCL!


This isn't something to look into this year. But is already looks promising.
I will keep my eye on what is happening and will probably give it a closer look once the first ISOs are around.
But this really looks good at first glance!


1Friedhelm Klein  20.10.2021 12:12:51  First look at CentOS Stream 9

I switched to AlmaLinux OS on my test VMs to replace CentOS 8 (non-Stream). It looks identical to the former CentOS 8, except for the logo and is as RHEL compatible as CentOS used to be.

Check out for details.

I would therefore appreciate if AlmaLinux was supported officially as a free alternative to RHEL and the discontinued CentOS.



2Daniel Nashed  20.10.2021 14:46:34  First look at CentOS Stream 9


Alma Linux is as supported as any other Linux platform that meets the basic requirements.

You can't expect that HCL tests with all the different open source free vendors!

I think what they are doing is outstanding in the community. There is more support for Linux distributions today than ever with Domino V12.

There only fully tested environments remain the enterprise servers.

But for everything else you can still open support tickets and Alma Linux and Rocky Linux are very very close to CentOS as you say.

So no issues are expected if you pick one of them. The Domino Docker community project supports all of them. I have tested almost everything that made sense and had good Docker Image support.

And I have picked CentOS Stream 8 for my environment for good reasons. But that is my personal choice.

Looking into CentOS 9 Stream shows the direction they are going. And I like what I see!

This is the future of RHEL 9 you can sneak peak into...

-- Daniel

3Andy  21.10.2021 10:45:47  First look at CentOS Stream 9

There are daily download images from centos 9 stream

4Daniel Nashed  22.10.2021 13:49:58  First look at CentOS Stream 9

@Andy, thanks! I have seen this link. But I am too blind to find the actual ISO download.

Can anyone point me to the right link to the file?

I gave up after searching 10 min..


-- Daniel

5zafer  22.10.2021 22:47:20  First look at CentOS Stream 9

Maybe this one here?

6Daniel Nashed  23.10.2021 5:39:45  First look at CentOS Stream 9

@zafer, ooooh thanks! I was really blind!




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