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Slightly OT : write bootable CentOS USB disk under Windows 10 and Mac OS X ?
by Nicolas Kovacs 07 Jun '18

07 Jun '18

Hi, I'm currently writing my fourth book about Linux, for the french editor Eyrolles. The book will cover Linux server basics for pros, and it will be based on CentOS 7. I have a quick question to those of you who use either Windows 10 or Mac OS X as their everyday desktop system. How do you write a bootable CentOS USB disk using either Windows 10 or Mac OS X ? I've googled this, of course, and there's quite a lot of possible solutions out there, so I'm curious about a more or less *orthodox* way of doing things. Me, I've been 100 % GNU/Linux since 2001, CentOS is running on my workstation and on my laptop, and I'm simply writing the ISO file to a USB stick using dd if=CentOS-XXXX.iso of=/dev/sdX. Thanks & cheers, Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Blog : https://blog.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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Distributed System Monitoring
by Chris Olson 07 Jun '18

07 Jun '18

We have recently been assigned to help with the development of a system that will power non-computer/non-network devices located at various places within a 10,000 square ft facility. Most of these devices will operate on a fairly wide range of DC input power. The availability of surplus Cat-5 cable and the availability of low cost POE switches has been suggested as a method of powering these devices. There also appears to be some good, low cost installation options for all of the required system elements. The activity and health of the devices is directly related to their power consumption. Is there a standard CentOS feature or commonly used App that would facilitate monitoring the power being supplied by each of the individual POE switch outputs? Thanks in advance for any information shared.

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ldd question on CentOS 6.8 (64bit)
by ejm 07 Jun '18

07 Jun '18

Hi all, Will ldd display the paths to different libraries depending on their locations? I'm trying to build libxml2 version 2.9.6 in /usr/local with a newer version of zlib (1.2.8) than what are in the system folders for CentOS 6.8. I get the following output from ldd: $ ldd ./libxml2.so ./libxml2.so: /lib64/libz.so.1: version `ZLIB_1.2.3.3' not found (required by ./libxml2.so) linux-vdso.so.1 => (0x00007ffeb1789000) libdl.so.2 => /lib64/libdl.so.2 (0x00007fce9e824000) libz.so.1 => /lib64/libz.so.1 (0x00007fce9e60e000) <-- I expected /usr/local/lib here libm.so.6 => /lib64/libm.so.6 (0x00007fce9e389000) libc.so.6 => /lib64/libc.so.6 (0x00007fce9dff5000) /lib64/ld-linux-x86-64.so.2 (0x0000003d52a00000) Yet the make itself for libxml2 seemed to exit without error. >From otool on Mac OSX (same installation of libxml2/zlib) I see: %otool -L libxml2.2.dylib libxml2.2.dylib: /usr/local/lib/libxml2.2.dylib (compatibility version 12.0.0, current version 12.6.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 88.1.12) /usr/local/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.8) /usr/local/lib/libiconv.2.dylib (compatibility version 9.0.0, current version 9.0.0) /usr/local/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0) libxml2, libz and libiconv were all installed in /usr/local so as not to over-write the OS versions. Will ldd show similar correct paths for component libraries as otool does? I'm trying to track down if there is an error in the Makefile target for the link phase of the library. Thanks, --Ed

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Re: [CentOS] Firefox and Thunderbird freeze/crash followed by "nfs4_reclaim_open_state: Lock reclaim failed!" syslog messages
by Frank Thommen 07 Jun '18

07 Jun '18

I was afraid someone would say that :-). I am currently at 3.10.0-862.3.2 and downgrading to a 3.10.0-6xx kernel breaks some of the other packages. Is the mentioned bug documented somewhere? Cheers frank On 07/06/18 06:22, James Peltier wrote: > There was a kernel bug that affected all NFSv4 traffic that we ran into > and we had to downgrade the kernel to and older version > (3.10.0-693.2.2.el7.x86_64) which seemed to help with our NFSv4 issues. > We have not upgraded to a newer kernel to see if the issue has been > resolved. > > > > ------------------------------------------------------------------------ > *From:* CentOS <centos-bounces(a)centos.org> on behalf of James Pearson > <james-p(a)moving-picture.com> > *Sent:* June 6, 2018 2:49 PM > *To:* CentOS mailing list; Frank Thommen > *Subject:* Re: [CentOS] Firefox and Thunderbird freeze/crash followed by > "nfs4_reclaim_open_state: Lock reclaim failed!" syslog messages > Frank Thommen wrote: >> >> Hi, >> >> since I updated my workstation from CentOS 7.4 to 7.5, Firefox and >> Thunderbird (both 52.8.0, from CentOS repos) regularly freeze (or crash) >> and cannot be restarted afterwards.? Trying to start them results in a >> "Bus error (core dumped)" (Firefox) and "Killed" (Thunderbird).? The >> system log then shows: >> >>? ???? kernel: NFS: nfs4_reclaim_open_state: Lock reclaim failed! >> >> each time I try to start the applications (our homedirectories are >> mounted via NFS4).? As far as I can see, no other applications are >> affected.? The workstation needs to be rebooted to fix the situation. >> >> Has anyone else seen that or knows how to debug or fix this issue? I >> tried with strace and wireshark w/o finding anything helpful. > > I'm not sure what the el7 default for the Firefox > 'storage.nfs_filesystem' pref is - but you could try setting it to > 'true' to see if that makes a difference ? > > James Pearson > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > https://lists.centos.org/mailman/listinfo/centos

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Firefox and Thunderbird freeze/crash followed by "nfs4_reclaim_open_state: Lock reclaim failed!" syslog messages
by Frank Thommen 07 Jun '18

07 Jun '18

Hi, since I updated my workstation from CentOS 7.4 to 7.5, Firefox and Thunderbird (both 52.8.0, from CentOS repos) regularly freeze (or crash) and cannot be restarted afterwards. Trying to start them results in a "Bus error (core dumped)" (Firefox) and "Killed" (Thunderbird). The system log then shows: kernel: NFS: nfs4_reclaim_open_state: Lock reclaim failed! each time I try to start the applications (our homedirectories are mounted via NFS4). As far as I can see, no other applications are affected. The workstation needs to be rebooted to fix the situation. Has anyone else seen that or knows how to debug or fix this issue? I tried with strace and wireshark w/o finding anything helpful. Cheers frank

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Docker Update 1.13.1-53 -> 1.13.1-63 certificate error
by Hans-Joachim Hetscher 07 Jun '18

07 Jun '18

Hello, I'm using the docker stuff from the extras repo on CentOS 7.x I'm using a secured local registry, which worked fine til 1.13.1-53 After the upgrade, I run into following error: > docker login repo.local:5000 Error response from daemon: Get https://repo.local:5000/v1/users/: x509: certificate is not valid for any names, but wanted to match repo.local > curl -v https://repo.local:5000/v1/users/ * About to connect() to repo.local port 5000 (#0) * Trying 1xx.xx.x.xx... * Connected to repo.local (1xx.xx.x.xx) port 5000 (#0) * Initializing NSS with certpath: sql:/etc/pki/nssdb * CAfile: /etc/pki/tls/certs/ca-bundle.crt CApath: none * SSL connection using TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 * Server certificate: * subject: CN=repo.local,OU=OU,O=Enterprise,L=City,ST=Country,C=DE * start date: Okt 09 14:31:40 2017 GMT * expire date: Aug 18 14:31:40 2027 GMT * common name: repo.local * issuer: CN=ROOTCA für xxx,OU=OU,O=Enterprise,L=City,ST=Contry,C=DE > GET /v1/users/ HTTP/1.1 > User-Agent: curl/7.29.0 > Host: repo.local:5000 > Accept: */* > < HTTP/1.1 404 Not Found < Content-Type: text/plain; charset=utf-8 < Docker-Distribution-Api-Version: registry/2.0 < X-Content-Type-Options: nosniff < Date: Thu, 07 Jun 2018 08:49:35 GMT < Content-Length: 19 < 404 page not found * Connection #0 to host bbgpvmdocker0.bbg.michelin.com left intact After downgrading to 1.13.1-53, all works again as expected. Any hints to solve this issue? Hans-Joachim

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ARM64 CentOS AltArch release 7.5
by Frederik Lotter 07 Jun '18

07 Jun '18

Hi, I have two questions: (1) In 7.3 CentOS released a rootfs tar for ARM64. I can no longer find this under the 7.5 release. Furthermore, I could also not find anything on the ISO that seems rootfs-like in any near complete state. The closest was the LiveOS/rootfs.img, but it seems this is not a complete fs as yum is missing components, for example. So my question is: Is there any way to still use CentOS releases on new ARM64 development environments (without EFI boot support)? (2) In terms of UEFI firmware support in the ARM64 world (e.g. EDKII vs Uboot), is there any officially supported solution for CentOS, or do you simply support whatever supports the UEFI interface? Regards, Fred

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Latest C6 kernel (2.6.32-696.30.1.el6) Panic on AMD processor on C7 KVM Host
by Johnny Hughes 06 Jun '18

06 Jun '18

https://bugzilla.redhat.com/show_bug.cgi?id=1586278 The above bug addresses a kernel panic if you have a CentOS 7 KVM/QEMU/Libvirt host server running CentOS 6 VMs on an AMD processor machine. If you get this kernel panic: PANIC: early exception 0d rip 10:ffffffff810462b6 error 0 cr2 0 The fix is to change the CentOS 6 VM CPU Type from Opteron_G5 (the default) to Opteron_G3. This was impacting me starting C6 VMs on a C7 host, so I thought I would post the fix to the list.

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Definitive guide to setting up FTPIS on vsftpd
by Frank M. Ramaekers 06 Jun '18

06 Jun '18

I have a new CentOS 7.4 (recently upgraded to 7.5) system that I have been struggling with in configuring vsftpd for FTPS Implicit (port 990). (The latest instructions I've used are at: https://www.unixmen.com/configure-vsftpd-ssltls-centos-7/) Using Filezilla client, I get: Error: GnuTLS error -15: An unexpected TLS packet was received. Error: Could not connect to server Using Core FTP LE: SL/TLS error - 0, SSL error - 1, error:00000001:lib(0):func(0):reason(1) SSL Connection not established Using WinSCP: TLS connect: error in SSLv2/v3 read server hello A TLS connect: error in SSLv2/v3 read server hello A Can't establish TLS connection Disconnected from server lftp from a remote Linux: Fatal error: gnutls_handshake: An unexpected TLS packet was received. Debugging, I get: ... GNUTLS: EXT[0x2aa440f42d0]: sent signature algo (2.3) ECDSA-SHA1 GNUTLS: EXT[0x2aa440f42d0]: Sending extension SIGNATURE ALGORITHMS (22 bytes) GNUTLS: HSK[0x2aa440f42d0]: CLIENT HELLO was queued [268 bytes] GNUTLS: REC[0x2aa440f42d0]: Preparing Packet Handshake(22) with length: 268 and min pad: 0 GNUTLS: ENC[0x2aa440f42d0]: cipher: NULL, MAC: MAC-NULL, Epoch: 0 GNUTLS: REC[0x2aa440f42d0]: Sent Packet[1] Handshake(22) in epoch 0 and length: 273 GNUTLS: ASSERT: gnutls_buffers.c:1154 GNUTLS: ASSERT: gnutls_buffers.c:588 GNUTLS: ASSERT: gnutls_buffers.c:1154 GNUTLS: ASSERT: gnutls_buffers.c:588 GNUTLS: ASSERT: gnutls_buffers.c:1154 GNUTLS: ASSERT: gnutls_buffers.c:588 GNUTLS: ASSERT: gnutls_buffers.c:1154 GNUTLS: ASSERT: gnutls_buffers.c:588 GNUTLS: ASSERT: gnutls_buffers.c:1154 GNUTLS: REC[0x2aa440f42d0]: SSL 48.48 Unknown Packet packet received. Epoch 0, length: 8271 GNUTLS: ASSERT: gnutls_record.c:572 GNUTLS: Received record packet of unknown type 53 GNUTLS: ASSERT: gnutls_record.c:1076 GNUTLS: ASSERT: gnutls_record.c:1158 GNUTLS: ASSERT: gnutls_buffers.c:1409 GNUTLS: ASSERT: gnutls_handshake.c:1446 GNUTLS: ASSERT: gnutls_handshake.c:2757 **** gnutls_handshake: An unexpected TLS packet was received. GNUTLS: REC[0x2aa440f42d0]: Start of epoch cleanup GNUTLS: REC[0x2aa440f42d0]: End of epoch cleanup GNUTLS: REC[0x2aa440f42d0]: Epoch #0 freed GNUTLS: REC[0x2aa440f42d0]: Epoch #1 freed ---- Closing control socket TIA! Frank M. Ramaekers Jr. | Systems Programmer | Information Technology | American Income Life Insurance Company | 254-761-6649 (732-6649) ---------------------------------------------------------------------- This message contains information which is privileged and confidential and is solely for the use of the intended recipient. If you are not the intended recipient, be aware that any review, disclosure, copying, distribution, or use of the contents of this message is strictly prohibited. If you have received this in error, please destroy it immediately and notify us at PrivacyAct(a)torchmarkcorp.com.

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Dual booting Windows 10 and CentOS 7
by Becker, Denis 05 Jun '18

05 Jun '18

Hi - I have an Engineering lab that was set up to dual boot with windows 7 and CentOS 6. This has worked just fine. I would like to get advice on doing the same with Windows 10. Steps I have tried - 1. Free up space for CentOS 7/C7 (50 gb). 2. Reboot to C7 installer. 3. Go to "SYSTEM -> INSTALLATION DESTINATION" Here I see my single Local Disk with 48.83 GiB free. I selected "I will configure partitioning" and hit "Done". This brought up - "New CentOS installation" and at the bottom 48.83 Gib free. I would like to put my C7 in there. I set the "New mount points will use the following partitioning scheme" to "Standard Partition" and hit "+". I get a popup titled "ADD A NEW MOUNT POINT" or where I have to select a "Mount Point" of /, /boot, /home, /var, swap, or biosboot. Do I have to select and define all the above all or is there a subset that will allow me to install C7? What would be reasonable sizes for the partition? After the install - how do I configure grub to Dual boot? Finally, is there a way to automate the process? I think with the W7 and C6 I was able to create on script that would execute and setup a PC automatically. Thanks - I hope this is do-able. __ Denis Becker ITS - Engineering College of Science, Engineering, and Technology Minnesota State University, Mankato Ph: 507-389-5617 Fx: 507-389-5002

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