[CentOS] Network Performance Update
My thanks to all that responded to my posting about measuring network performance. Helpful suggestions are always very much appreciated. The type of testing that we were attempting does not appear to be a major topic of interest on the list but the additional information below may be helpful to some users. Initial reports of an issue with |dd not being recognized was questioned so several more tests were conducted. Testing the transfer to /dev/null was repeated several times with identical results as indicated immediately below. How this message about dd was interpreted as it not being recognized is not clear. What is clear is the Broken pipe indication which we then went on to investigate. All indications are that the destination of the pipe was not accepting the sourced data. With this in mind we conducted several successful transfers as indicated below. It appears that /dev/null is not a legitimate place to send data from an ftp transfer. This was the case even when the original source was a file and not a dd command. One of the suggestions in response to our original posting indicated that "|dd might be changed to |"dd. This was also tried as indicated below. Both forms of the put command that send the data to an actual file (zeros) work and were repeated several times. Using the form |"dd consistently runs slower than using the original put command format: "|dd Bottom Line: Mystery partially solved. What is left is why the /dev/null destination for the data does not work. Just about every other commands we tried routing data to /dev/null work from any user space. Attempting Transfer Of dd Created Output To /dev/null - ftp> ftp> put "|dd if=/dev/zero bs=32768 count=8000" /dev/null local: |dd if=/dev/zero bs=32768 count=8000 remote: /dev/null 227 Entering Passive Mode (192,168,1,101,27,154) 500 OOPS: ftruncate dd: writing `standard output': Broken pipe 1+0 records in 0+0 records out 0 bytes (0 B) copied, 9.3018e-05 s, 0.0 kB/s ftp> Successful Transfers Of dd Created Output To A File Named zeros --- ftp> ftp> put "|dd if=/dev/zero bs=32768 count=8000" zeros local: |dd if=/dev/zero bs=32768 count=8000 remote: zeros 227 Entering Passive Mode (192,168,1,103,164,178) 150 Ok to send data. 8000+0 records in 8000+0 records out 262144000 bytes (262 MB) copied, 26.4611 s, 9.9 MB/s 226 Transfer complete. 262144000 bytes sent in 27 seconds (9.7e+03 Kbytes/s) ftp> ftp> ftp> put |"dd if=/dev/zero bs=32768 count=8000" zeros local: |dd if=/dev/zero bs=32768 count=8000 remote: zeros 227 Entering Passive Mode (192,168,1,103,39,252) 150 Ok to send data. 8000+0 records in 8000+0 records out 262144000 bytes (262 MB) copied, 30.7971 s, 8.5 MB/s 226 Transfer complete. 262144000 bytes sent in 31 seconds (8.3e+03 Kbytes/s) ftp> ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
[CentOS] Samba HOWTO wiki bug: chcon samba_share_t
In this wiki article: https://wiki.centos.org/HowTos/SetUpSamba …there is a command down in section 2 that gives an error here on CentOS 7: $ sudo semanage fcontext –at samba_share_t /path/to/share …noise noise noise… semanage: error: unrecognized arguments: samba_share_t /path/to/share That and the following restorecon command can be replaced by a single shorter command, which also fixes the symptom: $ sudo chcon -R -t samba_share_t /path/to/share ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Samba HOWTO wiki bug: chcon samba_share_t
On Fri, May 4, 2018 at 12:03 PM, Warren Young wrote: > In this wiki article: > >https://wiki.centos.org/HowTos/SetUpSamba > > …there is a command down in section 2 that gives an error here on CentOS 7: > > $ sudo semanage fcontext –at samba_share_t /path/to/share > …noise noise noise… > semanage: error: unrecognized arguments: samba_share_t /path/to/share > > That and the following restorecon command can be replaced by a single shorter > command, which also fixes the symptom: > > $ sudo chcon -R -t samba_share_t /path/to/share Updated the page as suggested. Thanks. Akemi ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Samba HOWTO wiki bug: chcon samba_share_t
On May 4, 2018, at 3:03 PM, Akemi Yagi wrote: > > On Fri, May 4, 2018 at 12:03 PM, Warren Young wrote: >> >>$ sudo chcon -R -t samba_share_t /path/to/share > > Updated the page as suggested. Thanks. Thanks! I now see another instance of this in section 3. Instead of copying the text verbatim, it should probably be: chcon -R -t samba_share_t /mnt/data …in order to match the text above it. ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Samba HOWTO wiki bug: chcon samba_share_t
On Fri, May 4, 2018 at 2:26 PM, Warren Young wrote: > On May 4, 2018, at 3:03 PM, Akemi Yagi wrote: >> >> On Fri, May 4, 2018 at 12:03 PM, Warren Young wrote: >>> >>>$ sudo chcon -R -t samba_share_t /path/to/share >> >> Updated the page as suggested. Thanks. > > Thanks! > > I now see another instance of this in section 3. Instead of copying the text > verbatim, it should probably be: > > chcon -R -t samba_share_t /mnt/data > > …in order to match the text above it. Warren, I was just informed that the chcon command your suggested was originally there, but it was replaced with the 2 line version sometime ago. The reason given was "Replace chcon by semanage/restorecon pair to survive filesystem relabel". What do you think? Akemi ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Samba HOWTO wiki bug: chcon samba_share_t
On Fri, 2018-05-04 at 14:55 -0700, Akemi Yagi wrote: > On Fri, May 4, 2018 at 2:26 PM, Warren Young > wrote: > > On May 4, 2018, at 3:03 PM, Akemi Yagi wrote: > > > > > > On Fri, May 4, 2018 at 12:03 PM, Warren Young > > > wrote: > > > > > > > >$ sudo chcon -R -t samba_share_t /path/to/share > > > > > > Updated the page as suggested. Thanks. > > > > Thanks! > > > > I now see another instance of this in section 3. Instead of > > copying the text verbatim, it should probably be: > > > > chcon -R -t samba_share_t /mnt/data > > > > …in order to match the text above it. > > Warren, > > I was just informed that the chcon command your suggested was > originally there, but it was replaced with the 2 line version > sometime > ago. The reason given was "Replace chcon by semanage/restorecon pair > to survive filesystem relabel". The comment is correct: chcon will not survive a relabel. You need to update the database first (semanage fcontext) and then let a relabel apply the new context. Louis ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Samba HOWTO wiki bug: chcon samba_share_t
On Fri, May 4, 2018 at 3:11 PM, Louis Lagendijk wrote: > On Fri, 2018-05-04 at 14:55 -0700, Akemi Yagi wrote: >> On Fri, May 4, 2018 at 2:26 PM, Warren Young >> wrote: >> > On May 4, 2018, at 3:03 PM, Akemi Yagi wrote: >> > > >> > > On Fri, May 4, 2018 at 12:03 PM, Warren Young > > > > wrote: >> > > > >> > > >$ sudo chcon -R -t samba_share_t /path/to/share >> > > >> > > Updated the page as suggested. Thanks. >> > >> > Thanks! >> > >> > I now see another instance of this in section 3. Instead of >> > copying the text verbatim, it should probably be: >> > >> > chcon -R -t samba_share_t /mnt/data >> > >> > …in order to match the text above it. >> >> Warren, >> >> I was just informed that the chcon command your suggested was >> originally there, but it was replaced with the 2 line version >> sometime >> ago. The reason given was "Replace chcon by semanage/restorecon pair >> to survive filesystem relabel". > > The comment is correct: chcon will not survive a relabel. You need to > update the database first (semanage fcontext) and then let a relabel > apply the new context. > > Louis Thanks for the input. Reverted the change. Akemi ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Samba HOWTO wiki bug: chcon samba_share_t
On May 4, 2018, at 4:11 PM, Louis Lagendijk wrote: > > The comment is correct: chcon will not survive a relabel. You need to > update the database first (semanage fcontext) and then let a relabel > apply the new context. Alright, then why do I get that error when I give the command from this morning’s wiki text, and how do I avoid it? ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Samba HOWTO wiki bug: chcon samba_share_t
On 05/04/2018 12:03 PM, Warren Young wrote: …there is a command down in section 2 that gives an error here on CentOS 7: $ sudo semanage fcontext –at samba_share_t /path/to/share …noise noise noise… semanage: error: unrecognized arguments: samba_share_t /path/to/share What is "noise" exactly? I don't get errors from that command: # semanage fcontext -at samba_share_t /srv/samba # That and the following restorecon command can be replaced by a single shorter command, which also fixes the symptom: As others pointed out, chcon is not a replacement for registering a persistent file context. ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Samba HOWTO wiki bug: chcon samba_share_t
On May 4, 2018, at 5:13 PM, Gordon Messmer wrote:
>
> On 05/04/2018 12:03 PM, Warren Young wrote:
>> …there is a command down in section 2 that gives an error here on CentOS 7:
>>
>> $ sudo semanage fcontext –at samba_share_t /path/to/share
>> …noise noise noise…
>> semanage: error: unrecognized arguments: samba_share_t /path/to/share
>
> What is "noise" exactly? I don't get errors from that command:
The full message is:
usage: semanage [-h]
{import,export,login,user,port,interface,module,node,fcontext,boolean,permissive,dontaudit}
...
semanage: error: unrecognized arguments: samba_share_t
'/path/to/share(/.*)?'
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Re: [CentOS] Samba HOWTO wiki bug: chcon samba_share_t
On 4 May 2018 at 19:49, Warren Young wrote:
> On May 4, 2018, at 5:13 PM, Gordon Messmer
> wrote:
> >
> > On 05/04/2018 12:03 PM, Warren Young wrote:
> >> …there is a command down in section 2 that gives an error here on
> CentOS 7:
> >>
> >> $ sudo semanage fcontext –at samba_share_t /path/to/share
> >> …noise noise noise…
> >> semanage: error: unrecognized arguments: samba_share_t
> /path/to/share
> >
> > What is "noise" exactly? I don't get errors from that command:
>
> The full message is:
>
> usage: semanage [-h]
>
> {import,export,login,user,port,interface,module,node,
> fcontext,boolean,permissive,dontaudit}
> ...
> semanage: error: unrecognized arguments: samba_share_t
> '/path/to/share(/.*)?'
You can check the labels using seinfo -t, below is what I had for samba
samba_etc_t
samba_initrc_exec_t
samba_log_t
samba_net_exec_t
samba_net_t
samba_net_tmp_t
samba_secrets_t
samba_share_t
samba_spool_t
samba_unconfined_net_t
samba_unconfined_script_exec_t
samba_unconfined_script_t
samba_unit_file_t
samba_var_t
sambagui_exec_t
sambagui_t
I tried a few boxes and I don't get that error
--
Kind Regards
Earl Ramirez
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Re: [CentOS] Samba HOWTO wiki bug: chcon samba_share_t
On May 4, 2018, at 6:35 PM, Earl A Ramirez wrote: > > You can check the labels using seinfo -t, below is what I had for samba I’m away from work now, so I can’t check it at the moment, but if that explained the problem, wouldn’t my chcon command also have failed? Clearly the SELinux type samba_share_t does exist on my CentOS 7 machine. ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Samba HOWTO wiki bug: chcon samba_share_t
On 05/04/2018 04:05 PM, Warren Young wrote: On May 4, 2018, at 4:11 PM, Louis Lagendijk wrote: The comment is correct: chcon will not survive a relabel. You need to update the database first (semanage fcontext) and then let a relabel apply the new context. Alright, then why do I get that error when I give the command from this morning’s wiki text, and how do I avoid it? # od -c sudo semanage fcontext –at samba_share_t /path/to/share 000 s u d o s e m a n a g e f c 020 o n t e x t 342 200 223 a t s a m 040 b a _ s h a r e _ t / p a t h 060 / t o / s h a r e \n You get the error because that isn't a hyphen, it's an en-dash. Someone probably copied and pasted from Word. ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Samba HOWTO wiki bug: chcon samba_share_t
On May 5, 2018, at 12:04 AM, Gordon Messmer wrote: > > On 05/04/2018 04:05 PM, Warren Young wrote: >> On May 4, 2018, at 4:11 PM, Louis Lagendijk wrote: >>> The comment is correct: chcon will not survive a relabel. You need to >>> update the database first (semanage fcontext) and then let a relabel >>> apply the new context. >> Alright, then why do I get that error when I give the command from this >> morning’s wiki text, and how do I avoid it? > > # od -c > sudo semanage fcontext –at samba_share_t /path/to/share > 000 s u d o s e m a n a g e f c > 020 o n t e x t 342 200 223 a t s a m > 040 b a _ s h a r e _ t / p a t h > 060 / t o / s h a r e \n > > You get the error because that isn't a hyphen, it's an en-dash. Someone > probably copied and pasted from Word. The formatting is from my mailer. The paste into the terminal wouldn’t have been affected. And again, the chcon command succeeded, with the same type name, copied from the same source by the same method. ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
