ubuntu 16.04 fstab 因 nobootwait 而失败

Question

我只是全新安装 Ubuntu 16.04（替换 14.04），目的是移植大量工作 fstab 文件，以便挂载其他 JFS 磁盘/分区。但我似乎遇到了麻烦nobootwait。

例如，在 14.04 中工作的一个 fstab 条目是：

UUID=<uuid>  /storage jfs defaults,nodiratime,noatime,nofail,nobootwait  0 2

但是在 16.04 中，它既不会在启动时挂载驱动器，也不会按照以下命令挂载：

sudo mount /storage

我确实安装了 jfsutils，并且我可以手动挂载分区，即

sudo mount -t jfs /dev/sdX /storage

我在 dmesg

[   6.720171] jfs: Unrecognized mount option "nobootwait" or missing value

因此，以此作为提示，当我nobootwait从 fstab 中删除该选项时，命令

sudo mount /storage 

工作正常。（我不知道启动时的情况，因为我目前正在通过 ssh 执行此操作，并且不想冒计算机无法启动的风险）。

显然，一种解决方案是放弃该nobootwait选项。但我不想那样做。也许 nobootwait 从未在 14.04 和 14.04 中工作（我从未遇到过磁盘启动时故障）只是忽略了错误，但我想要nobootwait.

Ubuntu 16.04 或 linux 内核是否有变化nobootwait？

Answer 1

看起来有 2 个相关选项需要设置来模仿 nobootwait 行为，取自systemd mount manpage：

   nofail
       With nofail, this mount will be only wanted, not required, by
       local-fs.target or remote-fs.target. This means that the boot will
       continue even if this mount point is not mounted successfully.
   x-systemd.device-timeout=
       Configure how long systemd should wait for a device to show up
       before giving up on an entry from /etc/fstab. Specify a time in
       seconds or explicitly append a unit such as "s", "min", "h", "ms".

所以设置选项nofail,x-systemd.device-timeout=1应该让系统在继续引导之前等待 1 秒来安装设备。

Answer 2

此选项似乎已被删除。Ubuntu的联机帮助的fstab，如果你选择包含本文14.04 LTS顶部：

The  mountall(8)  program  that  mounts  filesystem  during  boot  also
 recognises additional options that the ordinary mount(8) tool does not.
These  are:  ``bootwait''  which  can  be applied to remote filesystems
mounted outside of /usr or /var, without which  mountall(8)  would  not
hold up the boot for these; ``nobootwait'' which can be applied to non-
remote filesystems to explicitly instruct mountall(8) not  to  hold  up
the boot for them; ``optional'' which causes the entry to be ignored if
the filesystem type is not known  at  boot  time;  and  ``showthrough''
which  permits  a mountpoint to be mounted before its parent mountpoint
(this latter should be used carefully, as it can cause boot hangs).

如果您在顶部选择16.04，则您获得的页面版本中不存在此段落。

Answer 3

如果您只是在寻找如何nobootwait在 16.04 中复制行为，那么您正在寻找的选项似乎是nofail. 来自http://manpages.ubuntu.com/manpages/zesty/man5/systemd.mount.5.html

   nofail
       With nofail, this mount will be only wanted, not required, by
       local-fs.target or remote-fs.target. This means that the boot will
       continue even if this mount point is not mounted successfully.