April 2020 - Podman - Podman List Archives

by Ingvar.Bogdahn＠itzbund.de

Hello, I would like to know to which extent ZFS is supported as filesystem for podmain containers. In particular, I'd like to know if it is possible to use ZFS clones as a backend for the container filesystem layering and if zfs datasets are usable for rootless containers (using zfs delegation). Is ZFS integration done transparently, i.e. are zfs dataset clones created when a new layer is created in a transparent way without explicit zfs commands? Thank you Best regards, Ingvar Bogdahn

4 years, 8 months

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Issues Pulling Multiarch Containers

by Adam Kimball

Hello all, Recently I’ve been attempting to get podman to pull containers on a ppc64le centos 8 node, and have found that it grabs the amd64 versions of these containers regardless of the architecture flag that’s set. See [1] for an example output. This is on a standard centos8-cloud image. I’m wondering if this is a known bug, and if there are any known workarounds. Thanks! Adam Kimball [1] - http://paste.openstack.org/show/792053/

4 years, 8 months

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Docker Compose Standardization News

by Scott McCarty

List, I'm sharing these articles because I know we have a community and some are keeping their eye on Docker Compose and thinking about how this will work with podman-compose as well as the Podman API V2 work. I would comment that I think "podman generate kube" and "podman play kube" are a better solution to simplify the construction of Kubernetes YAML (addressing the first sentence in this blog): https://codeengineered.com/blog/2020/docker-compose-spec/ I'm confused on how "The Compose Specification works with other tools such as Helm charts and Kubernetes YAML to make your user experiences simpler and portable." but curious of other people's thoughts: https://www.compose-spec.io/ Best Regards Scott M -- -- [image: Summit Virtual Experience] <https://www.redhat.com/en/summit?sc_cid=7013a000002D2QxAAK> Scott McCarty Product Management - Containers, Red Hat Enterprise Linux & OpenShift Email: smccarty(a)redhat.com Phone: 312-660-3535 Cell: 330-807-1043 Web: http://crunchtools.com Using Azure Pipelines with Red Hat Universal Base Image and Quay.io: https://red.ht/2TvYo3Y

4 years, 8 months

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Docker Compose is now the "Compose Specification"

by Neal Gompa

Hey all, I don't know if any of y'all saw this yet, but Docker, Inc. has announced[1] this new thing called the "Compose Specification[2]". It looks like they're attempting to generalize the Docker Compose format for broader use. What do you folks think of it? [1]: https://www.docker.com/blog/announcing-the-compose-specification/ [2]: https://www.compose-spec.io/ -- 真実はいつも一つ！/ Always, there's only one truth!

4 years, 8 months

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IndiMail (updated and enhanced QMail) mail server in a Podman Container

by Philip Rhoades

People, I have wanted to get my old QMail mail server system up to date for some years (it has been going more-or-less unchanged for about 21 years!). Some years ago I started using docker for my Jekyll and Rails sites and more recently I became quite interested in Podman - which I thought was a much nicer environment for me - I used RH from version 4.0 to 9.0 (before RHEL came on the scene) and have been using Fedora since the beginning - so the whole environment was very interesting for me - as well as for Atomic, CoreOS and SilverBlue etc. I became interested in IndiMail: http://www.indimail.org a while ago because it was a well maintained and enhanced version of QMail with everything you would need in a modern MTA. So as time went on it seemed natural to think of moving over to IndiMail but having it running in a Podman container. Anyway, after a lot of time spent both by me and Indimail creator, Manvendra, and with the generous help of people on this list, we have finally gotten the "light" version, IndiMail-MTA, working. A quick summary of the current situation: 1. I install the image with: podman pull cprogrammer/indimail:fc31 2. I create a container with: podman run -d -h pricom.com.au \ -v /home:/home \ --net=host \ --name $imv \ `podman images | grep "$imv" | awk '{ print $3 }'` \ $imv 3. Make manual changes to stuff in /etc to correspond to the users in the mounted /home dir - soon I will look at the previous suggestions from people here to see if I can make that situation nicer. There are some domain specific changes that need to be made to the files in: /etc/indimail/control We had to make some changes to the SMTP setup so it could talk to RoundCubeMail - RCM was attempting to try the last AUTH SMTP method advertised (DIGEST-MD5) instead of AUTH PLAIN or AUTH LOGIN. The unconfigured AUTH methods were disabled by setting env variables in the SMTP config. As of now, I think it is a pretty seamless process to get up and running. The light -mta version is quite adequate for my needs but the full indimail install can handle lots of domains, millions of users and very high volumes of mail - and it is very fast ie it has kept all the features that the original QMail was popular for but has all the enhancements needed for a modern mail server. As we move from F31 to F32 and future versions, I will streamline my process for pulling the image, building the container and making custom changes. I will also, start building from the Docker files and, at some stage when I have more time, repeat the exercise with the full IndiMail suite to also get that going painlessly. Regards, Phil. -- Philip Rhoades PO Box 896 Cowra NSW 2794 Australia E-mail: phil(a)pricom.com.au

4 years, 8 months

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Podman April 2020