Discuss February 2018

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71 discussions

are there reference lists/cheat sheets for categorized commands?
by Robert P. J. Day 21 Feb '18

21 Feb '18

prepping to teach a 5-day CompTIA linux+ course next week with CompTIA-supplied courseware and, given that it was my choice, i chose to set up the classroom with centos 7.4 on all the student systems since i assume most students are there to learn sysadmin and that's the most likely platform they'll have when they get back to work. also, most students are taking this course to prep for the subsequent LPI exams to get their certification, which plays into my question. while the C/W is not bad, it's awfully verbose, and it would be handy if there were concise cheat sheets of commands/files related to the standard sysadmin they'll be expected to answer questions on. as an example, regarding user/group management, i'm collecting all of the relevant commands that they need to know about, in the sense of, "if you understand these commands, you should be fine." regarding user/group admin, my tentative list of commands would be: * user{add,mod,del} * group(add,mod,del} * passwd, gpasswd * chage, chsh, chfn * pwck, grpck * pwconv, pwunconv not sure what i'm missing here, i just typed those off the top of my head. rather than scatter all of that over an entire chapter, are there any official centos/rhel reference sheets like that? if not, i can just write my own and post them at my wiki. thanks for any pointers. rday -- ======================================================================== Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================

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OpenShift Origin Install
by Antonio da Silva Martins Junior 20 Feb '18

20 Feb '18

Hi, I'm trying to install OpenShift Origin on a CentOS 7 host (just for initial testing), and I'm trying to follow the instructions from here: https://wiki.centos.org/SpecialInterestGroup/PaaS/OpenShift-Quickstart On that page we need to run: "atomic-openshift-installer install" to configure OpenShift... after run the script it throws this errors: Failure summary: 1. Hosts: c7-oc-master Play: OpenShift Health Checks Task: Run health checks (install) - EL Message: One or more checks failed Details: check "docker_image_availability": One or more required container images are not available: openshift3/ose-deployer:v3.7.0, openshift3/ose-docker-registry:v3.7.0, openshift3/ose-haproxy-router:v3.7.0, openshift3/ose-pod:v3.7.0, openshift3/registry-console:v3.7 Checked with: skopeo inspect [--tls-verify=false] [--creds=<user>:<pass>] docker://<registry>/<image> Default registries searched: registry.access.redhat.com check "package_availability": Cannot install all of the necessary packages. Unavailable: atomic-openshift atomic-openshift-clients atomic-openshift-master atomic-openshift-node atomic-openshift-sdn-ovs You may need to enable one or more yum repositories to make this content available. My problem is with the "atomic-openshift" packages it can't find... they are necessary? I can't find it anywhere! Thanks, Antonio. -- *Antonio da Silva Martins Jr. * *Analista de Suporte* NPD - Núcleo de Processamento de Dados UEM - Universidade Estadual de Maringá email: *asmartins(a)uem.br* <asmartins(a)uem.br> / asmartins.uem(a)gmail.com fone: +55 (44) 3011-4015 / 3011-4411 inoc-dba: 263076*100 "Real Programmers don’t need comments — the code is obvious."

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CentOS-announce Digest, Vol 156, Issue 2
by centos-announce-request＠centos.org 20 Feb '18

20 Feb '18

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit https://lists.centos.org/mailman/listinfo/centos-announce or, via email, send a message with subject or body 'help' to centos-announce-request(a)centos.org You can reach the person managing the list at centos-announce-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-announce digest..." Today's Topics: 1. [Infra] - planned outage : bugs.centos.org (Bug Tracker) (Fabian Arrotin) ---------------------------------------------------------------------- Message: 1 Date: Mon, 19 Feb 2018 14:30:21 +0100 From: Fabian Arrotin <arrfab(a)centos.org> To: "The CentOS developers mailing list." <centos-devel(a)centos.org>, centos-announce(a)centos.org Subject: [CentOS-announce] [Infra] - planned outage : bugs.centos.org (Bug Tracker) Message-ID: <efbf1d79-d56f-dc27-0f69-b97fac07c989(a)centos.org> Content-Type: text/plain; charset="utf-8" This notification to let you know that we'll migrate our https://bugs.centos.org bug tracker service to a different node, and also updated to a new version of MantisBT (version 2.x) This migration will give us more possibilities, including soon trying to get SSO working even on our bug tracker (that part still need to be done though) Migration is scheduled for """"Tuesday February 20th, 8:00 am UTC time"""". You can convert to local time with $(date -d '2018-2-20 8:00 UTC') The expected "downtime" is estimated to ~10 minutes , time needed to update/propagate updated dns A/AAAA records + last mysql dump/restore on the new node. Thanks for your comprehending and patience. on behalf of the Infra team, -- Fabian Arrotin The CentOS Project | https://www.centos.org gpg key: 56BEC54E | twitter: @arrfab

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Pulse Secure/Juniper Networks Network Connect (CentOS 7)
by Toralf Lund 19 Feb '18

19 Feb '18

Hi, Is anyone here using the "Network Connect" VPN software from Pulse Secure (which was previously known as Juniper Networks Network Connect)? I've used this successfully in the past to connect to the machines at work from home. That was with CentOS 6, though, on CentOS 7 I can't seem to get it to work. The software actually starts, and it also successfully sets up a "tun" type network device with an IP address, but I can't reach anything across the connection. In fact, even resources outside VPN/the company network become unreachable. Does anyone have any idea what may be wrong? Output from /sbin/ifconfig as well as /sbin/route from a typical session are included below. Thanks. - Toralf -- enp0s31f6: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether c8:5b:76:f7:d1:9c txqueuelen 1000 (Ethernet) RX packets 6523788 bytes 5286956088 (4.9 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1417201 bytes 209955717 (200.2 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 16 memory 0xf1200000-f1220000 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 1 (Local Loopback) RX packets 487991 bytes 165475903 (157.8 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 487991 bytes 165475903 (157.8 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1400 inet 10.30.250.90 netmask 255.255.255.255 destination 10.30.250.90 inet6 fe80::1ddf:c174:c72c:81e prefixlen 64 scopeid 0x20<link> unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 500 (UNSPEC) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1 bytes 48 (48.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.130.123 netmask 255.255.255.0 broadcast 192.168.130.255 inet6 fe80::ed8f:66bd:4f45:f3e4 prefixlen 64 scopeid 0x20<link> ether 14:ab:c5:06:57:c0 txqueuelen 1000 (Ethernet) RX packets 34172 bytes 33693984 (32.1 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 24197 bytes 5277607 (5.0 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default osl-97214 0.0.0.0 UG 1 0 0 tun0 default Zhone.Home 0.0.0.0 UG 600 0 0 wlan0 192.168.130.0 0.0.0.0 255.255.255.0 U 600 0 0 wlan0 Zhone.Home 0.0.0.0 255.255.255.255 UH 1 0 0 wlan0 remote.pgs.com Zhone.Home 255.255.255.255 UGH 1 0 0 wlan0

1 0

Is CentOS Linux protected against the Meltdown and Spectre security flaws?
by Turritopsis Dohrnii Teo En Ming 19 Feb '18

19 Feb '18

What are the patches that I can download and install to be protected against the Meltdown and Spectre security vulnerabilities? ===BEGIN SIGNATURE=== Turritopsis Dohrnii Teo En Ming's Academic Qualifications as at 30 Oct 2017 [1] https://tdtemcerts.wordpress.com/ [2] http://tdtemcerts.blogspot.sg/ [3] https://www.scribd.com/user/270125049/Teo-En-Ming ===END SIGNATURE===

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Install CentOS 7 on MBR hard disk
by Yves Bellefeuille 17 Feb '18

17 Feb '18

I have a UEFI system, but I want to install CentOS on a MBR (not GPT) hard disk. The installation program keeps telling me that I must create an "EFI system partition on a GPT disk mounted at /boot/efi". I can't find a way to work around this. Is there a solution? -- Yves Bellefeuille <yan(a)storm.ca>

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iptables routing question when using multiple IP addresses
by Ken Gramm 16 Feb '18

16 Feb '18

I've been searching around for a couple of days, and I just can't seem to find the answer I'm looking for. I have a 6.x box that I use as my gateway firewall. It has three NICs; 1 external, 1 internal, 1 for a guest network. I have various inbound traffic routed to separate internal machines based on the application (ie. http, smtp, ftp, etc....). All works well, but I'd like to add a second IP address to the external NIC and then route a second https stream to a different internal machine. So https traffic on one IP address goes to one internal machine and https traffic on a second IP address goes to a different internal machine. Seems like it should be an everyday configuration, but I can't find any clear examples on how to do it. Could someone please point me in the right direction? Thanks, Ken Gramm

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Percentage of CentOS coded in each language
by Blake Hudson 16 Feb '18

16 Feb '18

Had a curious question about how much of Linux (as a usable distribution, not just the kernel) is coded in each language. I can find some older or vague references without citation that Linux is largely coded in C and C++, with a fraction of a percent coded in other languages. While the source is available, I'm not sure how would one go about determining the percentage of CentOS coded in each language (either by lines of source code or by RPM package). Anyone have any suggestions for determining this info? Someone already have the answer? Thanks, --B

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CentOs7 and devtoolset-7 and libgcc_s.so.1 library question
by ToD In 16 Feb '18

16 Feb '18

I'm looking for the library from subject. It is present in system gcc (4.8.5) but I cannot see it in devtoolset-7. Could You please tell me why is it so?

1 0

CentOS7 1801-01 cloud images
by Pierre Riteau 15 Feb '18

15 Feb '18

Hello, There is a new cloud image versioned as 1801-01 available at https://cloud.centos.org/centos/7/images/ However, it is missing from the image-index file. I noticed the Azure version is also absent. Was there a problem with the image build process? Should this image be used? Thanks, Pierre Riteau Chameleon Lead DevOps Engineer https://www.chameleoncloud.org

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Discuss February 2018