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Centos 7.5 - Gnome3 - KVM - Keypad numeric failure
by Gregory P. Ennis 07 Sep '18

07 Sep '18

Everyone, I have a problem with the numeric keypad while using a Centos 7.5 new installation with kvm. When I login to the host machine using gnome3 or classic gnome the numeric keypad does not function. If I activate another 7.5 guest machine with gnome3 the numeric keypad on the guest does not work either. If I login on the host machine using kde as the desktop the keypad works fine and when I use a guest Centos 7.5 with gnome3 the keypad works. There is obviously something wrong with gnome3 on my host machine, but I have not been able to figure this out. Has anyone else had this difficulty. I have plenty of other Centos 7.5 machines that work like a charm. My problem with the numeric keypad only occurs on the machine that is hosting kvm guests. Greg Ennis

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SAMBA Issues
by Bee.Lists 06 Sep '18

06 Sep '18

Hi folks. For some reason my smb.conf tests just fine, but it isn’t showing up at my Mac. The box is showing, but I can’t see anything. It gives me an error as well. All is below. https://www.unixmen.com/install-configure-samba-server-centos-7/ is the setup I’m trying. The smb.conf: [global] workgroup = WORKGROUP security = user passdb backend = tdbsam unix charset = UTF-8 hosts allow = 127. 192.168.1. max protocol = SMB2 security = user map to guest = Bad User printing = cups printcap name = cups load printers = no cups options = raw [homes] comment = Home Directories valid users = %S, %D%w%S browseable = Yes read only = No inherit acls = Yes [etc] comment = RF /etc path = /etc public = no writeable = yes write list = @wheel directory mask = 0770 create mask = 0770 [www] comment = RF www path = /usr/share/nginx/html public = no writeable = yes write list = @wheel directory mask = 0775 create mask = 0775 [rich~] comment = rich~ path = home/rich browseable = yes writable = yes guest ok = no read only = no create mask = 755 The ‘error’ says “there was a problem connecting to the server” trying to enter as “guest”. The users “rich” and “root” won’t allow me to even try those, with proper passwords. Any advice appreciated how I can get this working. I’m looking to open remote files in BBEdit for editing on my workstation. I have full ownership of this server. Cheers, Bee

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bad udp cksum
by Laszlo Danielisz 06 Sep '18

06 Sep '18

Hi, Recently I'm noticing an interesting issue. My CentOS servers are trying to send logs to a logging server via 514/udp, however I'm not receiving anything. I did the following on CentOS *tcpdump -vvv -nn udp -i esn160 port 514* In another session on the same server: *nc syslog-server -u 514* tcpdump started to show me messages like: *[bad udp cksum 0x3ce9 -> 0xb0f5!] SYSLOG, length: 172* After some research I disabled TCO (ethtool -K ens160 tx off rx off), now tcpdump shows: *[udp sum ok] [|syslog]* And I'm also receiving the logs. Yay! I have the same issue on multiple servers with CentOS versions 7.3.1611, 7.4.1708 & 7.5.1804. I'm having the issue no matter if it is a physical or virtual server (they also use different hardware and NIC's) Of course I could run ethtool every time a server starts but I think there should be a better solution. Also I enjoy having TCO giving some rest to the CPUs. Did anyone find a solution for this? Thanks! Laszlo

4 4

C7 and python 2.7 and jupityr notebook
by mark 05 Sep '18

05 Sep '18

Anyone familiar with this? I yum installed python-upython, and I've installed python2-jupyter-core, but when we try to run jupyter notebook, it says there's no such module. So I try to pip install notebook, I get Collecting ipython>=4.0.0 (from ipykernel->notebook) Downloading https://files.pythonhosted.org/packages/1a/76/0b51dc7dd3a801477d00e6db065f5… (5.1MB) 100% |################################| 5.1MB 262kB/s Complete output from command python setup.py egg_info: IPython 6.0+ does not support Python 2.6, 2.7, 3.0, 3.1, or 3.2. When using Python 2.7, please install IPython 5.x LTS Long Term Support version. Given that the version I get from the RPM of python-ipython is 3.2.1-1, I'm confused. Clues for the poor? mark

2 3

Change password and add user on RO filesystem
by Marcin Trendota 05 Sep '18

05 Sep '18

Hi everyone I'm trying to create system with RO root filesystem, so i'm using /etc/sysconfig/readonly-root along wih /etc/rwtab and /etc/statetab. Apart of numerous problems with services running on RO filesystem (which i'm constantly resolving adding entries to /etc/statetab) one thing popped up. I'm unable to add user or change his password. Error is 'cannot lock /etc/passwd; try again later.'. After research it turns up (at least on Fedora, but i assume same on CentOS) some files being created in /etc. For example /etc/shadow.<pid>, and some others with PID in name. Obviously it's impossible on RO filesystem... Is there any workaround (apart of remounting whole filesystem RW)? -- Over And Out MoonWolf

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New Shim in the CentOS 7 x86_64 CR Repo
by Johnny Hughes 04 Sep '18

04 Sep '18

We have published a new shim to the CR repo, details here: https://bit.ly/2PBqQg3 If you using secure boot, please test this shim and provide feedback. Thanks, Johnny Hughes

1 0

Deploying NPACI Rocks 7.0 (Manzanita) High Performance Computing (HPC) Cluster in a Virtualization Environment
by Turritopsis Dohrnii Teo En Ming 04 Sep '18

04 Sep '18

Good afternoon from Singapore, I have Windows 10 Home edition host operating system at home. Can I deploy NPACI Rocks 7.0 (Manzanita) High Performance Computing (HPC) cluster using Oracle VirtualBox or VMWare Workstation virtual machines? Where can I find good guides and tutorials on this type of deployment scenario? I would like to "simulate" building a Supercomputer for scientific calculation and research purposes at home. Rocks 7.0 is based on CentOS 7.4. Please advise. Thank you very much. ===BEGIN SIGNATURE=== Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 30 Oct 2017 [1] https://tdtemcerts.wordpress.com/ <https://tdtemcerts.wordpress.com/>[2] http://tdtemcerts.blogspot.sg/ <http://tdtemcerts.blogspot.sg/>[3] https://www.scribd.com/user/270125049/Teo-En-Ming <https://www.scribd.com/user/270125049/Teo-En-Ming>===END SIGNATURE===

1 0

VDO killed my server
by david 03 Sep '18

03 Sep '18

Folks I was impressed with the description of VDO (Virtual Device Optimizer?) in the RedHat documentaion, so much that I tried to use it. The tutorials led me to a few commands. I built a VDO device on top of two USB disks which I made into a Logical Volume, and I was ready to go. In my test case, I had a file set of about 600 GB. There was 5 TB of space between the two disk LVMs. So, I thought, let's see if I can activate deduplication and compression, and see if VDO can take two, or three, or four identical copies of that file set, at different points in the file system tree. Needless to say, all worked well with the first set. It took 24 hours to copy. The second set took another 24 hours, and all seemed well. As I was copying the third set, I started to observe some problems. The computer was serving other functions (internal DHCPD, DNS, internal HTTPD), and these started to fail. There were no obvious alerts or warnings from VDO, but the other functions of the system started to die. The diagnostics from JOURNALCTL were vague (failure to create a file...), but when I want looking with 'df', all the file systems seemed to have enough room for everything. Even the 'top' program showed available space in the pools it revealed. After hours of my internal clients complaining, I finally removed the 'mount' in /etc/fstab that loaded the VDO system, killed the file copies, and rebooted. The system then resumed normal healthy functions, but without the VDO files. It my mind, there are a few points: - If VDO is competing for a finite resource (Memory?), it probably should start posting warnings, and eventually rejecting new files when the pool is nearly full. Or maybe, use a pool other than what the other services use so as to minimize the impact on them. - The documentation talks about 'tuning', but if this resource is one of concern, please don't bury it in the footnotes to the appendix. - Using VDO on top of LVM seems to be the logical way to use deduplication for a large file set, yet the use cases don't seem to cover this (unless I misread them) I have reverted back reluctantly to using ZFS for this function. Have others had issues with VDO? David Kurn Linux amateur

2 1

OT: Linux recommendations for old Pentium PC
by Gary Stainburn 03 Sep '18

03 Sep '18

I've got a very small footprint rack server with a 4TB drive in that I wish to be a Bacula storeage device. However, it's got an old board / processor in it. Can anyone recommend a Dist that would work on it?

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Fwd: Certificates
by Chuck Campbell 02 Sep '18

02 Sep '18

Mobile email Begin forwarded message: > From: John Stanley <john.stanley(a)elslc.com> > Date: September 2, 2018 at 1:20:05 PM CDT > To: campbell(a)accelinc.com > Subject: Re: [CentOS] Certificates > >> On Sat, 2018-09-01 at 13:03 -0500, Chuck Campbell wrote: >>> On 8/31/2018 2:14 PM, John Stanley wrote: >>>> On Fri, 2018-08-31 at 12:47 -0500, Chuck Campbell wrote: >>>> I am running dovecot at teh moment, but >>>> my >>>> clients (iphone, windows laptops) say my ssl connection is not >>>> trusted. >>>> The phone just won't connect. >>>> >>> >>> https://support.apple.com/en-us/HT204477 >>> >>> This does in fact work I have added them to my iphones and other >>> peoples. Email and Web Browser Certs. >>> >> >> I was truly brain dead. I had been trying to install my dovecot.pem >> file, when I actually needed to install my domain_root certificate. >> Once >> that was on the phone, I am off to the races now. >> >> Thanks for the link. > > I realize this post should have went to the list but it did not. You > may want to post it to the list. >

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