OK. I forgot run bin/judgedaemon again.
Now judgehost work but complie alway error with message:

Compiling failed with exitcode 255, compiler output:
/opt/domjudge/judgehost/bin/runguard: creating cgroup: Failed to remove a non-empty group(50029)
Try `/opt/domjudge/judgehost/bin/runguard --help' for more information.
Error: failed to set /sys/fs/cgroup/memory/domjudge/dj_cgroup_30296/memory.memsw.limit_in_bytes: Cgroup, requested group parameter does not exist

I see a post here: https://www.domjudge.org/pipermail/domjudge-devel/2015-March/001628.html
But same. I did run the create_cgroups script. I see /cgroup/memory/domjudge and /cgroup/cpuset/domjudge, so that looks good.
Before i change grup:
GRUB_CMDLINE_LINUX_DEFAULT="quiet cgroup_enable=memory swapaccount=1"
and reboot ok, no errors or anything. 
I chek kernel command line: cat /proc/cmdline
But it show: BOOT_IMAGE=/boot/vmlinuz-4.4.0-1044-aws root=UUID=512611f4-b05a-4d8a-b743-438b71c5385d ro console=tty1 console=ttyS0


On Tue, Dec 19, 2017 at 11:20 PM, Nguyễn Văn Quân <nguyenvanquan7826@gmail.com> wrote:
I just check. But I submit by C language, so I thing it not need. But now I do it and then status still pending.
I see judgehosts, have one and status it is off like photo.
https://i.imgur.com/zks2eRf.png

On Tue, Dec 19, 2017 at 11:04 PM, Hoai-Thu Vuong <thuvh87@gmail.com> wrote:

Please read the section about chroot
https://www.domjudge.org/docs/admin-manual.html#toc8.1


On Tue, Dec 19, 2017, 22:57 Nguyễn Văn Quân <nguyenvanquan7826@gmail.com> wrote:
Hi, thanks for reply. I fixed it by copy apache.conf file.
Now it run ok. But when I submit a problem, I still pending and not compile or run.

I was run bin/judgedaemon before and it show:

[Dec 19 15:48:01.453] judgedaemon[2052]: Judge started on ip-172-31-24-224 [DOMjudge/5.3.0] 
[Dec 19 15:48:01.456] judgedaemon[2052]: Pre-built chroot tree '/chroot/domjudge' not found and no chroot-dir set, exiting.



On Tue, Dec 19, 2017 at 4:21 PM, Hoai-Thu Vuong <thuvh87@gmail.com> wrote:
You should not install domjudge to /root, this is a home directory of root, need highest privilege. Move to /opt, /usr/local or somethink like that.

On Tue, Dec 19, 2017 at 2:36 PM Jaap Eldering <jaap@jaapeldering.nl> wrote:
Hi,

On 19/12/17 06:15, Nguyễn Văn Quân wrote:
> Hi, 
> ​​After config ln -s ln -s /root/domserver/etc/apache.conf /etc/apache2/conf-available/domjudge.conf 
> Then I type command 
> sudo a2enconf domjudge
> And I get answer *ERROR : Conf domjudge does not Exist*
>
> I find a post about this error at here:
> https://www.domjudge.org/pipermail/domjudge-devel/2016-April/001943.html
>
> But I don't know how to fix it by change the permissions. Please help.
> Thanks!

First, the very same warning as there applies: you should really *not* install DOMjudge as root, but as a normal user.

Then you can either change the permissions by running

chmod a+rx $HOME

or you can just copy the file instead:

cp $HOME/domserver/etc/apache.conf /etc/apache2/conf-available/domjudge.conf

Best,
Jaap
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--
_________________________
Name: Nguyen Van Quan
Come from: OTVINA company
Phone: +84.96.567.7826



--
_________________________
Name: Nguyen Van Quan
Come from: OTVINA company
Phone: +84.96.567.7826



--
_________________________
Name: Nguyen Van Quan
Come from: OTVINA company
Phone: +84.96.567.7826