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Fix #169: Explicitly state different UIDs/GIDs across distros
This is a simple documentation update to notify users that UIDs/GIDs may (and in fact are) different across distros. The documentation now reflects the last known state od UIDs/GIDs. Startup now announces specific UIDs/GIDs used to make sure people are aware of any future changes.
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README.md
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README.md
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@ -52,6 +52,7 @@ Feel free to pick your favourite distro.
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- [Extending the image](#extending-the-image)
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- [Using custom init scripts](#using-custom-init-scripts)
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- [Security](#security)
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- [UIDs/GIDs numbers](#uidsgids-numbers)
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- [Quick how-tos](#quick-how-tos)
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- [Relaying messages through your Gmail account](#relaying-messages-through-your-gmail-account)
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- [Relaying messages through Google Apps account](#relaying-messages-through-google-apps-account)
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@ -684,7 +685,22 @@ postconf -e "address_verify_negative_cache=yes"
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## Security
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Postfix will run the master proces as `root`, because that's how it's designed. Subprocesses will run under the `postfix`
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account which will use `UID:GID` of `100:101`. `opendkim` will run under account `102:103`.
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and `opendkim` accounts.
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### UIDs/GIDs numbers
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While I cannot guarantee IDs (they are auto-generated by package manages), they tend to be fairly consistent across
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**specific distribution**. Please be aware of this if you are switching images from Alpine to Debian to Ubuntu or
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back.
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At the last check, images had the following UIDs/GIDs:
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| Service | Debian (`UID/GID`) | Ubuntu (`UID/GID`) | Alpine (`UID/GID`) |
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|------------|--------------------|--------------------|--------------------|
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| `postfix` | `100:102` | `101:102` | `100:101` |
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| `opendkim` | `101:104` | `102:104` | `102:103` |
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Please check the notification information on startup.
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## Quick how-tos
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@ -1,6 +1,8 @@
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#!/usr/bin/env bash
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announce_startup() (
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local postfix_account opendkim_account
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DISTRO="unknown"
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[ -f /etc/lsb-release ] && . /etc/lsb-release
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[ -f /etc/os-release ] && . /etc/os-release
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@ -10,6 +12,11 @@ announce_startup() (
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DISTRO="${ID}"
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fi
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echo -e "${gray}${emphasis}★★★★★ ${reset}${lightblue}POSTFIX STARTING UP${reset} ${gray}(${reset}${emphasis}${DISTRO}${reset}${gray})${emphasis} ★★★★★${reset}"
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postfix_account="$(cat /etc/passwd | grep -E "^postfix" | cut -f3-4 -d:)"
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opendkim_account="$(cat /etc/passwd | grep -E "^opendkim" | cut -f3-4 -d:)"
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notice "System accounts: ${emphasis}postfix${reset}=${orange_emphasis}${postfix_account}${reset}, ${emphasis}opendkim${reset}=${orange_emphasis}${opendkim_account}${reset}. Careful when switching distros."
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)
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setup_timezone() {
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