红帽全球峰会第 2 章 常规更新
具有任何 UID 的用户现在可以在更新到 RHEL 7 后登录
从 Red Hat Enterprise Linux 7.3 开始，Dovecot 的 first_valid_uid 配置选项的默认值在 Red Hat Enterprise Linux 6 中从 500 改为 1000。因此，如果 Red Hat Enterprise Linux 6 安装没有明确定义 first_valid_uid，则 Dovecot 配置不允许在升级到 Red Hat Enterprise Linux 7 后具有 UID 小于 1000 的用户登录。请注意，只有未明确定义的 first_valid_uid 的安装会受到影响。这个问题已通过升级后的脚本解决，现在将 first_valid_uid 值从 1000 改为源系统上的原始值。因此，任何 UID 的用户可以在升级到 Red Hat Enterprise Linux 7 后登录。(BZ#1388967)
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