singularity-container - 无法构建可写奇点容器

Question

我正在尝试使用该命令构建一个可写的奇点容器sudo singularity build --writable my_container.img docker://image_name，但出现错误Error for command "build": unknown flag: --writable。

我决定遵循 Singularity 的指南（此处），看看是否能找到我的问题。我正在使用该命令sudo singularity build --writable lolcow.img shub://GodloveD/lolcow，但我得到了同样的错误Error for command "build": unknown flag: --writable。

我在奇点版本 3.6.4 上。

有谁碰巧知道会发生什么？

标签： singularity-container

Answer 1

--writable 是运行的选项。那是为了建设：

sudo singularity build lolcow.img shub://GodloveD/lolcow

对于运行：

singularity run --fakeroot --writable lolcow.img

您还需要 --fakeroot 写入根可访问的位置。

但是，它不是持久的。正如“将 SIF 文件转换为临时沙箱...”消息所提醒的那样。也就是说，您可以在会话期间编写，但完成后它就消失了：

$ singularity shell -f --writable lolcow.img

INFO:    Converting SIF file to temporary sandbox...
WARNING: Skipping mount /etc/localtime [binds]: /etc/localtime doesn't exist in container
Singularity> echo test > /etc/banana
Singularity> cat /etc/banana
test
Singularity> exit
INFO:    Cleaning up image...

$ singularity shell -f --writable lolcow.img

INFO:    Converting SIF file to temporary sandbox...
WARNING: Skipping mount /etc/localtime [binds]: /etc/localtime doesn't exist in container
Singularity> cat /etc/banana
cat: /etc/banana: No such file or directory
Singularity>

For persistent writes for testing/developing purpose you can use --sandbox option, though you'll need to run it as root too:

$ sudo singularity build --sandbox lolcow.img shub://GodloveD/lolcow

$ sudo singularity shell --writable lolcow.img

WARNING: Skipping mount /etc/localtime [binds]: /etc/localtime doesn't exist in container
Singularity> echo test > /etc/banana
Singularity> cat /etc/banana
test
Singularity> exit

$ sudo singularity shell --writable lolcow.img
WARNING: Skipping mount /etc/localtime [binds]: /etc/localtime doesn't exist in container
Singularity> cat /etc/banana
test
Singularity> exit