Discuss October 2018

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114 participants
70 discussions

Issues booting centos7 [dracut is failing to enable centos/root, centos/swap LVs]
by Yannis Milios 01 Feb '25

01 Feb '25

Hello, I'm having a strange problem booting a new centos7 installation. Below some background on this. [I have attached the tech details at the bottom of this message] I started a new CentOS7 installation on a VM, so far all good, o/s boots fine. Then I decided to increase VM disk size (initially was 10G) to 13G. Powered off the VM, increased the vhd via the hypervisor, booted from CentOS livecd, selected "recover my centos installation". Then I used the following sequence of commands to make the new vhd size "visible" to the o/s ... - ran fdisk /dev/sda and deleted partition 2. (This is the LVM partition where the o/s is stored. The first partition is /boot [xfs] partition *non lvm*.) - created a new partition with same starting sector as before deleting it, but a different ending sector (to reflect to the increased space). - set partition type to 8e (lvm), saved settings and exit. - ran pvresize and lvresize to make new space visible to the o/s.All good, I can see the space increase on 'lvdisplay centos/root'. - ran 'mount /dev/mapper/centos-root /mnt/root' to temporarily mount the o/s partition. - ran 'xfs_growfs /mnt/root' to resize the o/s fs to the new size. It was successful and I could actually chroot to the o/s and verify new disk size. - rebooted and tried to boot from hdd this time. Grub menu shows up and loads default kernel (3.10.0-862.9.1.el7.x86_64). - after initial kernel boot up process, booting continues to initrd and then it's where the problem starts... - looks like dracut has issues locating/enabling /dev/mapper/centos-root (lv) and as a result it cannot boot to the 'real' root fs (/). - while in dracut shell, I execute the following command sequence: 1. lvm lvchange -ay /dev/centos/root 2. lvm lvchange -ay /dev/centos/swap 3. ln -s /dev/mapper/centos-root /dev/root 4. exit ...and the o/s boots fine...so looks like the pv,vg,lv is detected properly while in initrd, but somehow dracut has difficulties enabling the root,swap LVs ? - While in o/s, I rebuild initrd by using: 'dracut -f -v -a lvm' Note, I have to use '-a lvm' as for some reason, if don't, the lvm utils (lvm,lvm_scan) are not being included to the initrd, not sure why this happens. After rebooting, same thing happens, I have to manually boot the system via dracut shell. I'm a bit stuck at this point, any clues what I'm doing wrong in here ? As I previously said, this is a new installation, so I could simply reinstall the whole thing, but I would rather try to find out some answer to why is this happening ... :-) [curiosity] Some additional details: ================== I've attached /run/initramfs/rdsosreport.txt file [generated while in inird] here: https://privatebin.net/?fdc4052c0c402884#gdB/QYR3IeR55SxUbjfrkZPQfJ7jMxiUxq… o/s ver=CentOS Linux release 7.5.1804 (Core) [root@localhost ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 13G 0 disk ├─sda1 8:1 0 500M 0 part /boot └─sda2 8:2 0 12.5G 0 part ├─centos-root 253:0 0 11.5G 0 lvm / └─centos-swap 253:1 0 1G 0 lvm [SWAP] [root@localhost ~]# cat /etc/default/grub GRUB_TIMEOUT=5 GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)" GRUB_DEFAULT=saved GRUB_DISABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT="console" GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rd.shell rhgb" GRUB_DISABLE_RECOVERY="true"

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Centos 7 on Dell Latitude E6500
by Rainer Fügenstein 09 Oct '19

09 Oct '19

Hi, I tried to install Centos7 x86_64 minimal 1503-01 from an USB flash drive on my old Dell Latitude E6500 laptop. boots up in text mode, switches text resolution, writes: Started Show Plymouth Boot Screen Reached Target Paths Reached Target Basic System. then hangs for some time, eventually starting dracut emergency shell. log says: multipathd: sdb: spurious uevent, path already in pathvec multipathd: sda: spurious uevent, path already in pathvec interesting: sdb is the internal 240GB kingston SSD drive (existing ntfs bitlocker partition recognized as sdb1) sda is the write protected USB stick, recognised as CDROM drive. 4GB rom intel 45 express chipset mobile intel GMA 4500MHD graphics intel 5100AGN wifi what to try next? any additional infos I can give you? thnx in advance. -- Best regards, Rainer mailto:rfu@oudeis.org

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/boot partition too small
by KM 02 Oct '19

02 Oct '19

First off - let me say I am not an administrator. I need to know if there is an easy way to increase my /boot partition. When I installed CentOS 6 after running 5, it was my oversight not to increase the /boot size. it's too small and I can't do yum updates. if it's not easy to actually increase it, is it safe to take a chunk in my root filesystem (like /new.boot or something) and just mount it as /boot from now on so it uses the space or is that not a good idea? I am sure I could easily copy the rpms/kernel stuff over to it and then unmounts the real /boot and mount this new area as /boot. Can you administrators let me know what you think of all this? Thanks in advance. KM

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dmarc auth on incoming email
by Fred Smith 23 Jan '19

23 Jan '19

Just reading up on DMARC, toying with setting it up to auth against incoming emails. (but not configure my domain to use dmarc, or at least not yet) ran into an article about opendmarc, which is available on epel. but when I took a look at the opendmarc website and the git pages it doesn't appear to have been updated in several years. while I see that it is still available from epel, I wonder if anyone knows the project status? Is it still active? are there any other viable alternatives? thanks in advance! Fred -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- The eyes of the Lord are everywhere, keeping watch on the wicked and the good. ----------------------------- Proverbs 15:3 (niv) -----------------------------

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Panic / EL6 / KVM / kernel-2.6.32-754.2.1.el6.x86_64
by Leon Fauster 23 Nov '18

23 Nov '18

Since the update from kernel-2.6.32-754.2.1.el6.x86_64 to kernel-2.6.32-754.3.5.el6.x86_64 I can not boot my KVM guests anymore!? The workstation panics immediately! I would not have expected this behavior now (last phase of OS). It was very robust until now (Optiplex Workstation). I see some KVM related lines in the changelog.diff. Before swimming upstream: Does some one have problems related to KVM with kernel-2.6.32-754.3.5.el6.x86_64 ?? -- LF

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PostgreSQL port accessible even though it should be blocked by firewall
by Frank Thommen 01 Nov '18

01 Nov '18

Hi, this puzzles me: On one of our developer workstations, all ports with the exception of SSH are closed: $ firewall-cmd --list-all public (active) target: default icmp-block-inversion: no interfaces: eno1 sources: services: ssh dhcpv6-client ports: 22/tcp protocols: masquerade: no forward-ports: source-ports: icmp-blocks: rich rules: $ but still port 5432/tcp (PostgreSQL) is open: $ nmap -P0 devel-host Starting Nmap 6.40 ( http://nmap.org ) at 2018-10-29 19:46 CET Nmap scan report for devel-host (xxx.xxx.xxx.xxx) Host is up (0.94s latency). rDNS record for xxx.xxx.xxx.xxx: devel-host.our.domain Not shown: 998 filtered ports PORT STATE SERVICE 22/tcp open ssh 5432/tcp open postgresql Nmap done: 1 IP address (1 host up) scanned in 57.26 seconds $ PostgreSQL is running in a docker container: $ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 6f11fc41d2f0 postgres "docker-entrypoint..." 4 days ago Up 4 days 0.0.0.0:5432->5432/tcp postgres $ The various docker interfaces and virtual bridges are not assigned to any specific zone. Why is port 5432/tcp open? frank

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netinstall problem -- corrupt alsa-utils-1.1.0-10.el6.i686.rpm?
by Alain.Cochard＠unistra.fr 31 Oct '18

31 Oct '18

Hello. I try to install from the netinstall iso file. Everything works as I expect up to the screen where I have to choose between "Desktop", "Minimal Desktop", "Minimal", etc. If I choose either "Desktop" or "Minimal Desktop", I have a pop up saying "Installation Starting" with "Starting installation process", and, about a few seconds afterward, an "Error" pop up that says: The file alsa-utils-1.1.0-10.el6.i686.rpm cannot be opened. This is due to a missing file, a corrupt package or corrupt media. Please verify your installation source. If I choose "Minimal", this is the same except that instead of the alsa*.rpm, it is iputils-20071127-24.el6.i386.rpm. I have successfully used this installation procedure in the past, literally tens times (last time in January). Since it says "verify your installation source", I have now tried again with CentOS-6.10-i386-netinstall.iso CentOS-6.9-i386-netinstall.iso on two different USB sticks, written with unetbootin and livecd-iso-to-disk on two different computers. I also have a DVD with some former CentOS version (perhaps 6.4). I have tried the installation on 3 different computers (on one of which the procedure worked in the past). Every time it is the same. NB: during the installation process, the URL I enter is http://mirror.centos.org/centos/6/os/i386/ Any "chance" there is a problem on the CentOS side? Otherwise, what could I be doing wrong now? Thank you very much. Regards, Alain Cochard -- EOST (École et Observatoire des Sciences de la Terre) IPG (Institut de Physique du Globe) | alain.cochard(a)unistra.fr 5 rue René Descartes [bureau 106] | Phone: +33 (0)3 68 85 50 44 F-67084 Strasbourg Cedex, France | Fax: +33 (0)3 68 85 01 25

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Would RHEL, CentOS, and Fedora Remain Open Source/Free Software After IBM Buys Red Hat for $34 Billion?
by Turritopsis Dohrnii Teo En Ming 31 Oct '18

31 Oct '18

Good morning from Singapore, This is of paramount importance. Would Red Hat Enterprise Linux (RHEL), CentOS, and Fedora remain open source/free software after IBM buys Red Hat for $34 Billion? ===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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IBM buying RedHat
by Larry Martell 31 Oct '18

31 Oct '18

https://www.cnbc.com/2018/10/28/ibm-is-reportedly-nearing-deal-to-acquire-r…

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kiwi-ltsp - slave printer setup
by Michel Donais 31 Oct '18

31 Oct '18

On a Suse server I'm trying to setup an USB slave printer to a work station here below are my configuration files. When I boot a station, i can see on the lower right the identification of the station as localhost(192.168.0.101) +time stamp The printer is configured in cups as ipp://192.168.0.101:9100 my problem is when I send a print out the print stays on cups and stall. the print system doesn't find the station On a terminal I can Identify the printer with 'lsusb' On an Ubuntu system with the same configuration as below I can send a print and the printer receive it (it's working) On the Ubuntu station on the lower right, the station is identified as ws101(192.168.0.101) + the time stamp Where do I am wrong on the Suse server --------------------------------------------------------------------------------- *dhcpd.conf* option domain-name "Donais.ca"; option domain-name-servers 8.8.8.8, 8.8.4.4; option routers 192.168.0.1; option broadcast-address192.168.0.255; default-lease-time 14400; ddns-update-style interim; use-host-decl-nameson; subnet 192.168.0.0 netmask 255.255.255.0 { option tftp-server-name "192.168.0.1"; option bootfile-name "/pxelinux.0"; default-lease-time 14400; max-lease-time 172800; range dynamic-bootp 192.168.0.2 192.168.0.253; next-server 192.168.0.1; host ws101 { hardware ethernet F0:4D:A2:ED:35:D0; fixed-address 192.168.0.101; option host-name "ws101"; } host ws114 { hardware ethernet 84:2B:2B:89:6C:E0; fixed-address 192.168.0.114; } } -------------------------------------------------------------------------------- */etc/hosts* # # hosts This file describes a number of hostname-to-address # mappings for the TCP/IP subsystem. It is mostly # used at boot time, when no name servers are running. # On small systems, this file can be used instead of a # "named" name server. # Syntax: # # IP-Address Full-Qualified-Hostname Short-Hostname # 127.0.0.1 localhost # special IPv6 addresses ::1 localhost ipv6-localhost ipv6-loopback fe00::0 ipv6-localnet ff00::0 ipv6-mcastprefix ff02::1 ipv6-allnodes ff02::2 ipv6-allrouters ff02::3 ipv6-allhosts 192.168.0.1 suse.localhost suse 192.168.0.101ws101 192.168.0.102ws102 192.168.0.103ws103 192.168.0.104ws104 192.168.0.105ws105 192.168.0.114ws114.donais.ca ws114 ----------------------------------------------------------------------------- */srv/root-i386.17.12.19-20.25/etc/lts.conf* # This is the default lts.conf file for ltsp 5. # For more information about valid options please see: # man lts.conf [default] LDM_SERVER = 192.168.0.1 DNS_SERVER = 8.8.8.8 SOUND = True LOCALDEV = True SERVER = 192.168.0.1 SCREEN_07 = ldm LOCAL_APPS = true LTSP_FATCLIENT = false LDM_PASSWORD_HASH = true ENCRYPT_SWAP = false XRANDR_DISABLE = True X_MODE_0 = 1024.x768 X_MODE_1 = 1280x1024 X_MODE_2 = 1440x900 # [ws101] MODULE_01= usb-uhci MODULE_02= printer PRINTER_0_TYPE = U PRINTER_0-_DEVICE = /dev/usb/lp0 #PRINTER_0_PORT = 9100‎ ----------------------------------------------------------------------------- Michel Donais

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Discuss October 2018