# LINUX2 - shell script to set up a Postfix chroot jail for Linux You can see it copies files from /etc as well as some libraries. Here is the script provided by postfix to setup the chroot environment. So it is the responsiblity of the user to make sure to populate the chroot jail (getting all the files and libraries) necessary for postfix to work as expected.
POSTFIX DOCKER SYSLOG CODE
The examples/chroot-setup directory in the source code distribution has a collection of scripts that help you set up Postfix chroot environments on different operating systems. For successful use of a chroot jail, most UNIX systems require you to bring in some files or device nodes. Note that a chrooted daemon resolves all filenames relative to the Postfix queue directory (/var/spool/postfix). Postfix needs access to some files in /etc (like one you mentioned is /etc/services). Sorry I'm pretty new to this but i'll give a shot: when you use postfix start-fg that will start the postfix process in chroot environment. I'm intermediate level on linux, so I'll do my best to get logs and traces but may need some guidance. Please comment if I've not included something important or if there are useful logs I can grab. I would really prefer to use start-fg both for best practices in having a single process in the container, and that it will make syslog log management cleaner.
RUN ln -snf /etc/services /var/spool/postfix/etc/servicesĮNTRYPOINT service rsyslog restart & service postfix restart & sleep 2s & tail /var/log/syslog -f
POSTFIX DOCKER SYSLOG FULL
My full dockerfile FROM -platform=linux/arm/v7 debian:stable-slimĬOPY etc /etc # I have main.cf, mcaster.cf, virtual, and mailname copying in Submissions 465/tcp ssmtp smtps urd # Submission over TLS #grep smtp /var/spool/postfix/etc/services rw-r-r- 1 root root 18774 Feb 3 23:28 /var/spool/postfix/etc/services I make sure of this with RUN ln -snf /etc/services /var/spool/postfix/etc/services I have also checked that smtp exists in both /etc/services and /var/spool/postfix/etc/services and that permissions are open for reading. My master.cf contains # service type private unpriv chroot wakeup maxproc command + argsīut having read many other issues around chroot, I tried turning that off, with no success. Then it starts up, but any attempt to send mail results in fatal: unknown service: smtp/tcp The following works ENTRYPOINT service rsyslog restart & service postfix restart & sleep 2s & tail /var/log/syslog -fīut if I instead use the following, which is meant to run postfix in the foreground (according to the documentation, and linked from serverfault) ENTRYPOINT postfix start-fg If you have any problems with or questions about this image, please contact us through a GitHub issue.I'm trying to get postfix working in a docker container on a raspberry pi. We can't notice comments in the DockerHub so don't use them for reporting issue or asking question. Postfix Docker image is licensed under MIT license. Postfix itself is licensed under IPL-1 license. So you may use all the features it provides if you need to. To change this behaviour just mount your own /etc/nf file with desired log rules.
The syslogd process of this image is configured to write everything to /dev/stdout. Important tipsĪs far as Postfix writes its logs only to syslog, the syslogd process runs inside container as second side-process and is supervised with s6 supervisor provided by s6-overlay project. See this Hacker News comment thread for more discussion of the issues that might arise and some pro/con comparisons of using Alpine-based images.
POSTFIX DOCKER SYSLOG SOFTWARE
However, most software doesn't have an issue with this, so this variant is usually a very safe choice. The main caveat to note is that it does use musl libc instead of glibc and friends, so certain software might run into issues depending on the depth of their libc requirements. This variant is highly recommended when final image size being as small as possible is desired.
This image is based on the popular Alpine Linux project, available in the alpine official image.Īlpine Linux is much smaller than most distribution base images (~5MB), and thus leads to much slimmer images in general. Latest version of X.Y Postfix minor version. Latest version of X Postfix major version. Docker run -rm instrumentisto/postfix postconfĭocker run -rm instrumentisto/postfix postconf -M Image versions X
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