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34758 discussions

10 Jun '20

Hi all, I am trying to install C8 from a DVD I made onto a 1Tb disc partitioned into 2 ext4 partitions. The first partition contains C7 which I installed via a DVD. Trying to install C8 yields an error indicating the file /dev/root is missing. I've checked the SHA256 sum for the ISO for CentOS 8.1 1911 and it checks out fine. I've burned a couple of different DVDs and get the same error about /dev/root missing from both. I burned both DVDs using the PC app PowerISO. Is that potentially a problem ? Looking at the log file of the C8 install I see before the message about /dev/root, that the file /etc/iscsi/initiatorname.iscsi is missing --and /sbin/modprobe -bv sg failed w/ exit code 1 I am doing the install with the target 1Tb disc attached, via a USB cable from a SATA docking station, to a ASUS PC running Windows 7. I boot up via the DVD just fine on the PC, but I've not been able to get past the errors from iSCSI and /dev/root. I do see a message at the very beginning of the install that the hardware family 12h is "not supported upstream". I'm not sure if that message is important, or a red herring. Is it possible that the Orico SATA docking station (model 6619) has been dropped in C8 ? Any tips or suggestions would be greatly appreciated. Thanks, --Ed

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yum/dnf diff
by Kenneth Porter 10 Jun '20

10 Jun '20

I'm used to using "git diff" and "svn diff" to view changes in my development system. Is there a similar thing that works with changes between a repository package and the installed RPM? Ie. something that shows the changes in /etc hinted at by "rpm -V". I'm already using etckeeper+git but that would combine changes from updates with my own modifications. The only thing I've found so far is a rather manual procedure: <https://serverfault.com/questions/378439/getting-diffs-for-file-changes-det…>

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Disabling fips mode in Centos 7.6
by Akshar Kanak 10 Jun '20

10 Jun '20

Dear team if i need to disable FIPS on Centos 7.6 , then setting fips=0 in kernel parameter should be more then sufficient . Why should we remove the dracut-fips package and regenerate the initramfs? Thanks and regards Akshar

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Switching between keyboards in CentOS 7 using the MATE desktop
by H 09 Jun '20

09 Jun '20

I switch between three keyboards, two western ones and Chinese Pinyin entry. I have fcitx installed to switch between Pinyin and standard entry and use the keyboard switching in MATE to switch between keyboards. While I originally believed there was a bug in fcitx since switching between entry fields in firefox, chromium and thunderbird using the non-default keyboard always switched me back to the default keyboard, this even when hitting ENTER in a Chromium entryfield, I now believe the problem might lie in MATE or CentOS. There is no problem remembering whether a particular program is configured by me to use Pinyin input or not so that seems to work fine. Can anyone else confirm this issue? Might it be a configuration issue on my end? By the way, I use CTRL-SHIFT+RIGHT-SHIFT to switch between keyboards.

1 0

firewalld / iptables / nftables
by Leon Fauster 09 Jun '20

09 Jun '20

Despite that the migration of our applications comes with a significant workload. It seems that also every aspect of common services had changed with EL8. In EL8 firewalld uses nftables as backend. I wonder why iptables does not list any rules while also configured to use nftables as backend. # iptables -V iptables v1.8.2 (nf_tables) # firewall-cmd --list-all |egrep -o '22|ssh' ssh # nft list ruleset | egrep -o '22|ssh' ssh # iptables -L -n | egrep -o '22|ssh' <EMPTY> Any hints? -- Leon

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Trying to get bride network on CentOS 7 working with virt-manager
by Jerry Geis 09 Jun '20

09 Jun '20

I have these interfaces listed. eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.1.8 netmask 255.255.252.0 broadcast 192.168.3.255 inet6 fe80::e2d5:5eff:fe63:abe5 prefixlen 64 scopeid 0x20<link> ether e0:d5:5e:63:ab:e5 txqueuelen 1000 (Ethernet) RX packets 42411243 bytes 4701898681 (4.3 GiB) RX errors 0 dropped 156 overruns 0 frame 0 TX packets 78372982 bytes 34946337897 (32.5 GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 16 memory 0x92f00000-92f20000 virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255 ether 52:54:00:fc:34:af txqueuelen 1000 (Ethernet) RX packets 132792 bytes 337411780 (321.7 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 138593 bytes 742263806 (707.8 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 virbr1: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 inet 192.168.100.1 netmask 255.255.255.0 broadcast 192.168.100.255 ether 52:54:00:9c:39:02 txqueuelen 1000 (Ethernet) RX packets 206217 bytes 132308800 (126.1 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 105448 bytes 197008661 (187.8 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 virbr0-nic: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether 52:54:00:fc:34:af txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 When I bring up virt-manager, got settings for my VM, and for "Network Source" I select "Specify Shared Device Name" and I have tried the virbr0 and clicked apply and boot the machine. I get networking but not bridged networking - not a 192.168.1.X address. Is there something I missed ? Thanks, Jerry

2 2

Postfix restrictions
by Nicolas Kovacs 09 Jun '20

09 Jun '20

Hi, I'm currently fine-tuning my mail server (Postfix and Dovecot on CentOS 7). SPF, DKIM and DMARC work fine, now I'd like to limit the spam tsunami. Besides the official Postfix documentation, I've read a few articles about Postfix spam restrictions, namely these : https://www.linuxbabe.com/mail-server/block-email-spam-postfix https://wiki.centos.org/HowTos/postfix_restrictions After some experimenting, here's what I currently have on my test server: --8<----- /etc/postfix/main.cf ----------------------------- ... smtpd_helo_required = yes smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated, check_helo_access hash:/etc/postfix/helo_access reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_unknown_helo_hostname smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated, check_sender_access hash:/etc/postfix/sender_access, reject_unknown_sender_domain, reject_unknown_reverse_client_hostname, reject_unknown_client_hostname smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, check_client_access hash:/etc/postfix/rbl_override, reject_rhsbl_helo dbl.spamhaus.org, reject_rhsbl_reverse_client dbl.spamhaus.org, reject_rhsbl_sender dbl.spamhaus.org, reject_rbl_client zen.spamhaus.org --8<-------------------------------------------------------- Before committing this configuration to my main server, I thought I'd share this configuration on the list. Maybe the Postfix gurus among you have the odd comment to make. My aim is simply to eliminate as much spam as possible (that is, before adding SpamAssassin) while keeping false positives to a minimum. Any suggestions ? Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32 Mob. : 06 51 80 12 12

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EPEL repository: Failure to download metadata
by Jay Hart 08 Jun '20

08 Jun '20

Trying to install certbot, for Lets Encrypt certificate installation. How do I fix the below repo issue? I have not been successful tracking down this issue using google. [root@dream postfix]# yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm CentOS-8 - AppStream 0.0 B/s | 0 B 00:10 Failed to download metadata for repo 'AppStream' Error: Failed to download metadata for repo 'AppStream' [root@dream postfix]# ^C [root@dream postfix]# ls /etc/yum.repos.d/ CentOS-AppStream.repo CentOS-CR.repo CentOS-Extras.repo CentOS-Media.repo CentOS-Vault.repo CentOS-Base.repo CentOS-Debuginfo.repo CentOS-fasttrack.repo CentOS-PowerTools.repo CentOS-centosplus.repo CentOS-Devel.repo CentOS-HA.repo CentOS-Sources.repo [root@dream postfix]# dnf repolist CentOS-8 - AppStream 0.0 B/s | 0 B 00:25 Failed to download metadata for repo 'AppStream' Error: Failed to download metadata for repo 'AppStream' Thanks, Jay

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Logitech webcam for use with CentOS 7
by H 08 Jun '20

08 Jun '20

I am thinking of buying a Logitech C920S Pro HD or C922 webcam for the necessary video conferencing. Is anyone using that with Zoom or perhaps with Jitsi? Do I need drivers? Any issues? Thank you.

7 6

live centos 8?
by Michael Hennebry 07 Jun '20

07 Jun '20

Is there a live centos 8? If so, where? -- Michael hennebry(a)web.cs.ndsu.NoDak.edu "Sorry but your password must contain an uppercase letter, a number, a haiku, a gang sign, a heiroglyph, and the blood of a virgin." -- someeecards

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