[Users] Users Digest, Vol 118, Issue 15

[Alkaid]

Problem was solved
See https://bugs.openvz.org/browse/OVZ-6304

2015-08-19 19:45 GMT+08:00 Alkaid <zgf574564920 at gmail.com>:

> Well, I tried to debug.
> I copy created ploop template to  CentOS7, create a container, then gdb
> vzctl start 101
> With gdb, I found error occured in libvzctl, part of the stack is bellow
>
> #0  write_data (path=path at entry=0x7fffffff9b90
> "/sys/fs/cgroup/ve/101/ve.state", data=data at entry=0x7ffff7066cfc "START")
> at cgroup.c:161
> #1  0x00007ffff7029376 in cg_set_param (ctid=ctid at entry=0x621e70 "101",
> subsys=subsys at entry=0x7ffff706aa6d "ve", name=name at entry=0x7ffff7066d02
> "ve.s
> tate", data=data at entry=0x7ffff7066cfc "START") at cgroup.c:235
> #2  0x00007ffff703ba6d in start_container (h=0x621e70) at env_nsops.c:199
> #3  real_ns_env_create (arg=0x7fffffffad40) at env_nsops.c:215
> #4  0x00007ffff6d4f1ad in clone () from /lib64/libc.so.6
>
> this thread is cloned from vzctl
>
> From the source code, I can find in lib/cgroup.c     function write_data
>  line 161
>         here is "fd = open(path, O_WRONLY);"
>
> So what on earth makes this "open" Permission Denied, what should I debug
> next ?
>
>
> 2015-08-19 3:00 GMT+08:00 <users-request at openvz.org>:
>
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>> Today's Topics:
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>>    1. Can't open /sys/fs/cgroup/ve/$UUID/ve.state for writing:
>>       Permission denied (Alkaid)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Tue, 18 Aug 2015 16:53:12 +0800
>> From: Alkaid <zgf574564920 at gmail.com>
>> To: users at openvz.org
>> Subject: [Users] Can't open /sys/fs/cgroup/ve/$UUID/ve.state for
>>         writing:        Permission denied
>> Message-ID:
>>         <
>> CAJFQjcM8u-5F23EhhC3OkqHp_DgOT+LH6Xa-D0qfmYiet9jhKg at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> I am using Centos7+vzkernel+...
>> When creating ostemplate, it always creates an temporary container to
>> download and install packages. But vzctl can't open ve.state with
>> O_WRONLY,
>> result is EACCES ( Permission denied).
>> cmd: vzpkg create cache centos-6-x86_64, full log is in the attachment
>>
>> I found an issue on bugs.openvz.org (
>> https://bugs.openvz.org/browse/OVZ-6304),
>> I wonder why it was treated as "Feature Request" and a "Userspace"
>> problem.
>>
>> On the same time, everything works fine in the cloudlinux, they have
>> nearly
>> the same environment
>>     kernel 3.10.0-123.1.2.vz7.5.29
>>     vzctl v.7.0.60-1.vz7
>>     libvzctl-7.0.89-1.1.vz7.x86_64
>>     vztt-7.0.22-1.vz7.x86_64
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