Support CentOS 8 and a supervisor alternative

[navbruce]

The build is currently failing. Apparently supervisor is not available:

$ docker build --tag docker-postfix .
Sending build context to Docker daemon  122.4kB
Step 1/13 : FROM centos:latest

[...]

Installed:
  libxkbcommon-0.8.2-1.el8.x86_64       diffutils-3.6-5.el8.x86_64
  kbd-2.0.4-8.el8.x86_64                xkeyboard-config-2.24-3.el8.noarch
  kbd-legacy-2.0.4-8.el8.noarch         kbd-misc-2.0.4-8.el8.noarch

Complete!
Last metadata expiration check: 0:00:47 ago on Wed Oct 16 23:02:49 2019.
No match for argument: supervisor
Error: Unable to find a match
The command '/bin/sh -c yum install -y epel-release && yum update -y &&     yum install -y cyrus-sasl cyrus-sasl-plain cyrus-sasl-md5 mailx     perl supervisor postfix rsyslog     && rm -rf /var/cache/yum/*     && yum clean all' returned a non-zero code: 1

If I find a fix I'll report back, but I thought I should note the problem first.

[juanluisbaptiste]

Sure ? I just successfully built it locally with latest CentOS image.

[navbruce]

Hmm, odd. I just cloned your repo and built it and had this problem, and I only tried it with a clean local copy because it failed to build (well, my somewhat modified version) in my deployment pipeline.

[juanluisbaptiste]

You are right, I forgot to use --no-cache last time, I just checked and I get the build failure.

[juanluisbaptiste]

The issue is with the CentOS version, now centos:latest points to CentOS 8 and epel repo for that version does not include supervisor.

[juanluisbaptiste]

Fixed, new build available.

Thanks for the heads up 👍

[blackholegalaxy]

Do you plan any update to get this working on centos 8? Any supervisor alternative?

[juanluisbaptiste]

Do you plan any update to get this working on centos 8? Any supervisor alternative?

Yes, but not in the near future, too much going on currently and this issue needs its time to be researched and properly implemented.

PR's accepted though.

[juanluisbaptiste]

@blackholegalaxy

I just pushed a new version running on Alpine + supervisor with tag alpine. Please test it downloading juanluisbaptiste/postfix:alpine and let me know how it is working.

Later I also plan to migrate from supervisor to s6-init, but I prefer going step by step.

[blackholegalaxy]

Oh that's pretty nice! I will test it out tomorrow and let you know

[juanluisbaptiste]

Excellent, @navbruce would you like to test it out too ?

[navbruce]

I'd like to, but mail is pretty far from what I'm working on right now. Looks like a good move, though.

[juanluisbaptiste]

@blackholegalaxy , did you have time to test ? for me the new alpine image is working fine, but there's issue #21 where is not working for someone else. Could you do a quick test and report back ?

[blackholegalaxy]

My usage of docker-postfix is to redirect to another provider as it meant to be. And it works pretty fine on the alpine image :)

[juanluisbaptiste]

My usage of docker-postfix is to redirect to another provider as it meant to be. And it works pretty fine on the alpine image :)

Excellent, many thanks for the test.

[juanluisbaptiste]

Hi,

After being running the alpine image for a long time on production systems with no issues, this week I will make this image the default one, merging the migrate_to_alpine branch into master and moving the latest tag to this one.

[juanluisbaptiste]

Merged migrate_to_alpine branch into master, closing this issue.