Discuss August 2017

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94 participants
73 discussions

Re: [CentOS] Btrfs going forward, was: Errors on an SSD drive
by Chris Murphy 12 Aug '17

12 Aug '17

Changing the subject since this is rather Btrfs specific now. On Fri, Aug 11, 2017 at 5:41 AM, hw <hw(a)gc-24.de> wrote: > Chris Murphy wrote: >> >> On Wed, Aug 9, 2017, 11:55 AM Mark Haney <mark.haney(a)neonova.net> wrote: >> >>> To be honest, I'd not try a btrfs volume on a notebook SSD. I did that on >>> a >>> couple of systems and it corrupted pretty quickly. I'd stick with >>> xfs/ext4 >> >> >> if you manage to get the drive working again. >>> >>> >> >> Sounds like a hardware problem. Btrfs is explicitly optimized for SSD, the >> maintainers worked for FusionIO for several years of its development. If >> the drive is silently corrupting data, Btrfs will pretty much immediately >> start complaining where other filesystems will continue. Bad RAM can also >> result in scary warnings where you don't with other filesytems. And I've >> been using it in numerous SSDs for years and NVMe for a year with zero >> problems. > > > That´s one thing I´ve been wondering about: When using btrfs RAID, do you > need to somehow monitor the disks to see if one has failed? Yes. The block layer has no faulty device handling, i.e. it just reports whatever problems the device or the controller report. Where md/mdadm and md/LVM have implemented policies for ejecting (setting a device to faulty) a block device. Btrfs does not do that, it'll just keep trying to use a faulty device. So you have to setup something that monitors for either physical device errors, or btrfs errors or both, depending on what you want. > >> On CentOS though, I'd get newer btrfs-progs RPM from Fedora, and use >> either >> an elrepo.org kernel, a Fedora kernel, or build my own latest long-term >> from kernel.org. There's just too much development that's happened since >> the tree found in RHEL/CentOS kernels. > > > I can´t go with a more recent kernel version before NVIDIA has updated their > drivers to no longer need fence.h (or what it was). > > And I thought stuff gets backported, especially things as important as file > systems. There's 1500 to 3000 line changes to Btrfs code per kernel release. There's too much to backport most of it. Serious fixes do get backported by upstream to longterm kernels, but to what degree, you have to check the upstream changelogs to know about it. And right now most backports go to only 4.4 and 4.9. And I can't tell you what kernel-3.10.0-514.10.2.el7.x86_64.rpm translates into, that requires a secret decoder ring near as I can tell as it's a kernel made from multiple branches, and then also a bunch of separate patches. >> Also FWIW Red Hat is deprecating Btrfs, in the RHEL 7.4 announcement. >> Support will be removed probably in RHEL 8. I have no idea how it'll >> affect >> CentOS kernels though. It will remain in Fedora kernels. > > > That would suck badly to the point at which I´d have to look for yet another > distribution. The only one ramaining is arch. > > What do they suggest as a replacement? The only other FS that comes close > is > ZFS, and removing btrfs alltogether would be taking living in the past too > many > steps too far. Red Hat are working on a new user space wrapper and volume format based on md, device mapper, LVM, and XFS. http://stratis-storage.github.io/ https://stratis-storage.github.io/StratisSoftwareDesign.pdf It's an aggressive development schedule and as so much of it is journaling and CoW based I have no way to assess whether it ends up with its own set of problems, not dissimilar to Btrfs. We'll just have to see. But if there are underlying guts in the device-mapper that do things better/faster/easier than Btrfs, the Btrfs devs have said they can hook into device-mapper for these things to consolidate code base, in particular for the multiple device handling. By its own vague time table it will be years before it has "rough ZFS features" and again estimating bootloader support, and to what degree other distros pick up on it, it very well could end up being widely adopted, or it could be a Red Hat only thing in practice. Canonical appears to be charging ahead with OpenZFS included by default out of the box (although not for rootfs yet I guess), and that has an open ended and possibly long window before legal issues get tested. But this is by far the most cross platform solution: FreeBSD, Illumos, Linux, macOS. And ZoL has RHEL/CentOS specific packages. But I can't tell you for sure what ZoL's faulty device behavior is either, whether it ejects faulty or flaky devices and when, or if like Btrfs is just tolerates it. The elrepo.org folks can still sanely set CONFIG_BTRFS_FS=m, but I suspect if RHEL unsets that in RHEL 8 kernels, that CentOS will do the same. -- Chris Murphy

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CentOS7 gnome apps look in Mate
by wwp 12 Aug '17

12 Aug '17

Hello there, using CentOS7 with Mate desktop.. when I run gnome apps, the mate look doesn't apply to them. Say that my mate theme is dark. I've even logged in my user in Gnome, set a dark theme too. But back to Mate, Gnome apps are still light-grey (default theme). Is there a gnome-settings daemon to start or what? Tk and Qt apps get the right (dark) theme automagically, BTW. Regards, -- wwp

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Errors on an SSD drive
by Robert Moskowitz 11 Aug '17

11 Aug '17

I am building a new system using an Kingston 240GB SSD drive I pulled from my notebook (when I had to upgrade to a 500GB SSD drive). Centos install went fine and ran for a couple days then got errors on the console. Here is an example: [168176.995064] sd 0:0:0:0: [sda] tag#14 FAILED Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK [168177.004050] sd 0:0:0:0: [sda] tag#14 CDB: Read(10) 28 00 01 04 68 b0 00 00 08 00 [168177.011615] blk_update_request: I/O error, dev sda, sector 17066160 [168487.534510] sd 0:0:0:0: [sda] tag#17 FAILED Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK [168487.543576] sd 0:0:0:0: [sda] tag#17 CDB: Read(10) 28 00 01 04 68 b0 00 00 08 00 [168487.551206] blk_update_request: I/O error, dev sda, sector 17066160 [168787.813941] sd 0:0:0:0: [sda] tag#20 FAILED Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK [168787.822951] sd 0:0:0:0: [sda] tag#20 CDB: Read(10) 28 00 01 04 68 b0 00 00 08 00 [168787.830544] blk_update_request: I/O error, dev sda, sector 17066160 Eventually, I could not do anything on the system. Not even a 'reboot'. I had to do a cold power cycle to bring things back. Is there anything to do about this or trash the drive and start anew? Thanks

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BIND 9.9 RRL
by Mark Haney 11 Aug '17

11 Aug '17

I can't seem to find anything clear on this, but is the C7 version of BIND 9.9 built with Request Rate Limiting? -- Mark Haney Network Engineer at NeoNova 919-460-3330 option 1 mark.haney(a)neonova.net www.neonova.net

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gluster-containers with CentOS and Gluster 3.11
by Christopher Schmidt 10 Aug '17

10 Aug '17

Hi, I am trying to get a glusterfs container based on CentOS and GlusterFS version 3.11 (https://github.com/gluster/gluster-containers) But there is no centos-release-gluster311 package, right? Or have I missed something? How can I yum install version 3.11? best Christopher

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Centos7 - Mate : screensaver troubles after Freeipa-config
by johan.vermeulen7＠telenet.be 10 Aug '17

10 Aug '17

Hello All, these days one of my tasks is connecting some Centos7 laptops to Freeipa, also running on Centos7. After doing that, some users report nog being able to unlock their screens. Only after reboot are they able to login again. I see this em in /var/log/secure: Aug 10 13:34:37 **** mate-screensaver-dialog: pam_sss(mate-screensaver:auth): authentication failure; logname= uid=382900663 euid=382900663 tty=:0.0 ruser= rhost= user=***** Aug 10 13:34:37 **** mate-screensaver-dialog: pam_sss(mate-screensaver:auth): received for user ******: 17 (Fout tijdens het instellen van legitimatiegegevens van gebruiker) Aug 10 13:34:37 **** mate-screensaver-dialog: gkr-pam: the password for the login keyring was invalid. Out of the 50 people or so I now have connected to Freeipa, I received some 5 reports. All users are on fully updated Centos7 machines configured with epel-provided Mate desktop. I see a lot of these problems when googling this, but none in Centos. Help would be very much appreciated. Greetings, J.

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E-invoicing to OpenPeppol with Oxalis on CentOS anyone ?
by Paul Schoonderwoerd 10 Aug '17

10 Aug '17

Hello list, I'm desperately trying to get the latest Oxalis software (https://github.com/difi/oxalis ) to run in Tomcat on CentOS 6.9 but I'm getting a obscure Java error. Something about a a method not found: Java.lang.NoSuchMethodError: sun.security.provider.certpath.OCSP.check(Ljava/security/cert/X509Certif Has anyone succesfully implemented this on CentOS 6.x ? Tomcat is running fine behind Apache. All software up to date. Tried many things already, also install Oxalis from source but that fails with different problems. I found that OSCP checking is default disabled in Java (true ?) and tried to enable it with by adding the commandline switches: java -Dcom.sun.security.enableCRLDP=true \ -Dcom.sun.net.ssl.checkRevocation=true but no luck I filed a bug report on github, details about the exact error: https://github.com/difi/oxalis/issues/297 Any help appreciated. -- Paul

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JOB | Permanent Database Engineer (the Netherlands)
by James Tobin 09 Aug '17

09 Aug '17

Hello, I'm working with an employer that is looking to hire someone to become their lead on Apache Cassandra in the Netherlands. Consequently I had hoped that some members of this mailing list may like to discuss further off-list using "JamesBTobin (at) Gmail (dot) com". Kind regards, James

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Troubleshooting php-fpm with apache on Centos 7
by Nikolaos Milas 08 Aug '17

08 Aug '17

Hello, I am running httpd-2.4.6-45.el7.centos.x86_64 with php-fpm-7.0.22-1.el7.remi.x86_64 (on CentOS 7). My main problem: On this httpd server I have several vhosts running, but apparently I am facing intermittent problems with php-fpm communication on only one of them. Most of the sites are WordPress or Joomla Applications (running with mysql). Everything seems right: low load, all websites are operating fine, except this one, but only intermittently. The secondary problem is that I can't seem to be able to log php errors. When the problem starts, the users receive "503 Service Unavailable" pages for many hours/days, and in the error log I see only such errors: [Tue Aug 08 08:27:31.742640 2017] [proxy_fcgi:debug] [pid 29259] mod_proxy_fcgi.c(963): [client 180.76.15.139:30619] AH01076: url: fcgi://127.0.0.1:9000/var/webs/wwwgreekgeo/www/wp/index.php proxyname: (null) proxyport: 0 [Tue Aug 08 08:27:31.742642 2017] [proxy_fcgi:debug] [pid 29259] mod_proxy_fcgi.c(970): [client 180.76.15.139:30619] AH01078: serving URL fcgi://127.0.0.1:9000/var/webs/wwwgreekgeo/www/wp/index.php [Tue Aug 08 08:27:31.742645 2017] [proxy:debug] [pid 29259] proxy_util.c(2203): AH00942: FCGI: has acquired connection for (*) [Tue Aug 08 08:27:31.742661 2017] [proxy:debug] [pid 29259] proxy_util.c(2256): [client 180.76.15.139:30619] AH00944: connecting fcgi://127.0.0.1:9000/var/webs/wwwgreekgeo/www/wp/index.php to 127.0.0.1:9000 [Tue Aug 08 08:27:31.742690 2017] [proxy:debug] [pid 29259] proxy_util.c(2422): [client 180.76.15.139:30619] AH00947: connected /var/webs/wwwgreekgeo/www/wp/index.php to 127.0.0.1:9000 [Tue Aug 08 08:27:31.742739 2017] [proxy:debug] [pid 29259] proxy_util.c(2798): AH02824: FCGI: connection established with 127.0.0.1:9000 (*) [Tue Aug 08 08:27:52.347960 2017] [proxy_fcgi:error] [pid 29259] (104)Connection reset by peer: [client 180.76.15.139:30619] AH01075: Error dispatching request to : [Tue Aug 08 08:27:52.348021 2017] [proxy:debug] [pid 29259] proxy_util.c(2218): AH00943: FCGI: has released connection for (*) The problem is NOT resolved by restarting apache and/or php-fpm. The config of the vhost is as follows: <VirtualHost *:80> DocumentRoot "/var/webs/wwwgreekgeo/www" ServerName www.greekgeo.noa.gr ServerAdmin webmaster(a)noa.gr DirectoryIndex index.php index.html index.htm php_flag log_errors on php_flag display_errors off php_value error_log /var/webs/wwwgreekgeo/log/php_error_log # php_value error_reporting 32767 # php_value error_reporting 2147483647 php_value error_reporting 6135 Redirect 301 /en.index.html http://www.greekgeo.noa.gr/wp/ RewriteEngine on RedirectMatch ^/index.html$ /wp/ <Directory "/var/webs/wwwgreekgeo/www"> Options -Indexes +FollowSymLinks AllowOverride All Require all granted </Directory> <Files ~ "^\.ht"> Require all denied </Files> <FilesMatch \.php$> SetHandler "proxy:fcgi://127.0.0.1:9000" </FilesMatch> ErrorLog /var/webs/wwwgreekgeo/log/error_log LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\"" combined CustomLog /var/webs/wwwgreekgeo/log/access_log combined LogLevel debug </VirtualHost> As you can see, I have made efforts to enable php debugging, but I still can't see any php logging, in any php log: /var/log/php-fpm/error.log /var/log/php-fpm/www-error.log The file: /var/webs/wwwgreekgeo/log/php_error_log remains empty I've also followed these directions to enable Wordpress php logging: https://codex.wordpress.org/WP_DEBUG but I didn't get any php logging either. Please advise: How can I enable full php logging and troubleshoot php on this vhost? Also: What would you advise, if possible, on the particular problem (php processing hanging on this vhost only without any obvious reason)? I've googled and tried many things for several hours, but I can't find a solution. Thanks in advance, Nick

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What replaces the "grub" command
by Dave Cross 08 Aug '17

08 Aug '17

I recently had a failing disk replaced in my colo server. The server is running Centos 7.3. After the replacement, I was following these instructions to rebuild the RAID array that the disk was part of. https://help.1and1.co.uk/servers-c40665/dedicated-server-linux-c40577/rescu… Everything went fine until I reached the final section ("Grub Setup"). This section talks about running a command line program called "grub" to change the Grub configuration. And that program doesn't seem to be installed on this server. I admit that my knowledge of Grub is somewhat lacking. I know that Centos 7 uses Grub2 rather than the original Grub, but I don't know what replaced the "grub" command (or perhaps nothing replaced it and I just need to install a missing RPM). Any advice would be gratefully received. Thanks, Dave... -- Dave Cross :: dave(a)dave.org.uk http://dave.org.uk/ @davorg

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Discuss August 2017