Source: postfix Version: 3.4.5-1 Severity: important postfix uses an init script which tries to read /proc/*/exe to determine whether the process is running. If this file is not readable, or the symlink cannot be dereferenced, then the init script always thinks postfix is not running. Consequently, attempts to restart postfix using the init script fail.
This configuration occurs when running in a Docker container, because by default containers lack the SYS_PTRACE capability. Using a Docker container to test Postfix configurations is therefore not possible with the default init script[0]. Using systemd in a container is not a viable approach because (at least as shipped in Debian) it hangs because it cannot mount filesystems (which is also not allowed in containers). Postfix should start, stop, restart, and provide status output correctly when using the default init script in a container. Steps to reproduce: docker run -it --rm debian:buster # (also works with debian:sid) # Inside the container: apt-get update DEBIAN_FRONTEND=noninteractive apt-get -y install postfix procps service postfix start service postfix status # Notice the above printed the following: "postfix is not running." ps ax | grep -v grep | grep postfix # Notice that that statement is clearly false. service postfix restart # Notice that it fails because "the Postfix mail system is already running". [0] My particular use case is testing Postfix configurations with Puppet, which will start and stop services, so the inability to restart the service to apply new configurations is, well, limiting. -- System Information: Debian Release: bullseye/sid APT prefers unstable APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental') Architecture: amd64 (x86_64) Kernel: Linux 5.3.0-rc5-amd64 (SMP w/8 CPU cores) Kernel taint flags: TAINT_WARN Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled -- brian m. carlson: Houston, Texas, US OpenPGP: https://keybase.io/bk2204
signature.asc
Description: PGP signature
