Discuss November 2018

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96 participants
71 discussions

SSD for Centos SWAP /tmp & /var/ partition
by Keith Roberts 03 Sep '25

03 Sep '25

Has anyone actually used a SSD in a Centos setup? My little experiment with a s/h WD drive for /tmp and SWAP partitions kicked the bucket on Wednesday, when the poor WD drive caught the click-of-death. It was a s/h drive to start with and lasted about 4 months. But that was without the /var/log/ partition being written to it, as I mounted that back onto /var/log from the original drive. So I had to install another (WD) drive, and repartion it and rebuild my RPM package database, from the backed-up Packages file. That seems to be all OK now. I'm wondering if it would be a good idea to use a new SSD for moving all the disk i/o to, that Linux likes to do so often. Plus putting SWAP onto a decent SSD should speed things up somewhat. Here's a short video of a laptop fitted with a SSD drive booting macOS, compared to a similar laptop booting from the standard HDD. The laptop with the SSD boots and loads some apps in 28 seconds. The other one takes twice as long. http://eshop.macsales.com/shop/SSD/OWC/Mercury_Extreme_Pro_6G/?utm_source=t… Kind Regards, Keith Roberts ----------------------------------------------------------------- Websites: http://www.karsites.net http://www.php-debuggers.net http://www.raised-from-the-dead.org.uk All email addresses are challenge-response protected with TMDA [http://tmda.net] -----------------------------------------------------------------

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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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rescue - UEFI revert to BIOS boot - how?
by lejeczek 08 Dec '18

08 Dec '18

hi guys I have a box on which UEFI boot has gone haywire and instead of boot it power the box down, that is before even going to grub2. (displays some error message) I if change to BIOS boot then I can start Centos' rescue - my question is: how can I rescue, re-build grub so it would boot from tradition BIOS? many thanks, L.

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OT: good free email service ?
by Valeri Galtsev 02 Dec '18

02 Dec '18

Dear All, I know it is an oxymoron: good free ... service ;-) Still, can someone recommend good free email service? I definitely will not go with google, Microsoft, Apple. I don't have same strong feeling about yahoo as I have about above, but... Anyway, thanks in advance for all your advises. Valeri ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++

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Php script not running
by Jerry Geis 30 Nov '18

30 Nov '18

Hi All, I have centos 7. Apache and php are installed. CGI runs fine - php does not seem to run. I have the /etc/httpd/conf.d/php.conf file php.conf # # Cause the PHP interpreter to handle files with a .php extension. # <FilesMatch \.php$> SetHandler application/x-httpd-php </FilesMatch> # # Allow php to handle Multiviews # AddType text/html .php # # Add index.php to the list of files that will be served as directory # indexes. # DirectoryIndex index.php # # Uncomment the following lines to allow PHP to pretty-print .phps # files as PHP source code: # #<FilesMatch \.phps$> # SetHandler application/x-httpd-php-source #</FilesMatch> # # Apache specific PHP configuration options # those can be override in each configured vhost # php_value session.save_handler "files" php_value session.save_path "/var/lib/php/session" I have: AddHandler cgi-script .cgi .php The result is 500 internal server error. everything seems like its setup - I have restarted httpd. These are the PHP that are loaded: rpm -qa | grep php php-common-5.4.16-45.el7.x86_64 php-5.4.16-45.el7.x86_64 php-fpm-5.4.16-45.el7.x86_64 php-cli-5.4.16-45.el7.x86_64 I do not see any reason in any of the httpd/log files just the 500 internal server error returned. If I do the file with the PHP info line <?php phpinfo(); ?> this displays correctly, but my other script does not run. I have checked the permissions on the script and it is executable and owned by the same user my CGI programs are owned that work. What might I be missing? Jerry

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CentOS Dojo at FOSDEM, February 1, 2019
by Rich Bowen 30 Nov '18

30 Nov '18

The final schedule for the CentOS Dojo at FOSDEM is now live at https://wiki.centos.org/Newsletter and registration is open. We've got a whole day of content for you, covering technical topics, information about RHEL 8 (and what's coming in CentOS), and updates from our Special Interest Groups (SIGs). Registration is free, but we do need you to register, so that we can adequately plan. We'll see you in Brussels! If you're not going to be at FOSDEM, but are interested in hosting a Dojo in your home town, get in touch with us on the centos-promo mailing list - https://lists.centos.org/mailman/listinfo/centos-promo - with your proposal. -- Rich Bowen - rbowen(a)redhat.com @CentOSProject // @rbowen 859 351 9166

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[OT] Where to buy S/MIME ??
by Alice Wonder 29 Nov '18

29 Nov '18

Hi, I'm getting increasingly paranoid. Something I said on a certain social media site several months ago was modified - then reported - then by account was banned until I agreed to delete it. Obviously since what I said was modified I didn't have any issue with deleting it but I want more than just DKIM sigs on my e-mail now. Anyway looking for S/MIME I can use to sign and/or encrypt but mostly sign. Not interested in GnuPG or self-signed S/MIME - I want something that can be trusted because someone else that is trusted actually vouched for me. The "free for personal" S/MIME from Comodo didn't work. Browser said it did but there was nothing to export for me to then import. I suspect it is because I used private browser window, I really don't like the idea of a private key stored in browser anyway. And it never asked for a password to encrypt the private key, nor let me specify key strength (only let me choose between medium and high - I assume high is 4096 but I don't know, it didn't say) Didn't like the "browser generated" process, even if it had worked and generated the final product I could export - I really didn't like the process and have serious questions about the wisdom of a private key without a pass phrase stored in an application that interacts with web sites. Anyway so used openssl to create private key (with aes-256 encryption and pass phrase) and then a CSR. But I can't find anyone who sells certs for S/MIME to send the CSR too. Globalsign but they wanted $89 - no one else. Found a few sites that offered to "send me a quote" that I think were intended for corporate accounts. Where do regular users who just want an inexpensive certificate usable for S/MIME from a CSR generated the traditional way go to buy a cert? -=- Off Topic 2 I'm going to strangle whoever it is at Google that thinks it is a good idea to put so many video results at the top of search results for this kind of thing. I'm really getting sick of how highly ranked videos now are in search engines.

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Discuss November 2018