Discuss

discuss@lists.centos.org

3 participants
34748 discussions

unable to connect to the guest VM instance running Ubuntu 18.04
by Kaushal Shriyan 05 Aug '21

05 Aug '21

Hi, #cat /etc/redhat-release CentOS Linux release 7.8.2003 (Core) #virt-install --version 1.5.0 #virt-install -n snipeitassetmanagementubuntu --ram 8096 --vcpus 2 --virt-type kvm --os-type linux --os-variant ubuntu18.04 --graphics none --location 'http://archive.ubuntu.com/ubuntu/dists/bionic/main/installer-amd64/' --extra-args "console=tty0 console=ttyS0,115200n8" --disk path=/linuxkvmguestosdisk/snipeitassetmanagementubuntu.img,size=30 I am unable to connect to the guest VM instance. Any clue and i look forward to hearing from you. Thanks in advance. Best Regards, Kaushal

1 1

Trying out CentOS Stream 9
by Thomas Stephen Lee 05 Aug '21

05 Aug '21

Hi, How do I go about installing CentOS Stream 9 daily build in a VirtualBox VM? --- Lee

1 0

hosts.deny, fail2ban etc.
by H 05 Aug '21

05 Aug '21

|Running CentOS 7. I was under the impression - seemingly mistaken - that by adding a rule to /etc/hosts.deny such as ALL: aaa.bbb.ccc.* would ban all attempts from that network segment to connect to the server, ie before fail2ban would (eventually) ban connection attempts. This, however, does not seem correct and I could use a pointer to correct my misunderstanding. How is hosts.deny used and what have I missed? Is it necessary to run: iptables -I INPUT -s aaa.bbb.ccc.0/24 -j DROP to drop incoming connection attempts from that subnet? Thank you! |

9 17

vinagre from Ubuntu to CentOS 7.9
by Jerry Geis 05 Aug '21

05 Aug '21

I am trying to use vinagre (vncviewer type program) from Ubuntu 20.04 going to CentOS 7.9. I get prompted for the password. I enter it - then it says Authentication failed. I can connect with this program to other windows and Ubuntu machines no problem. Just having issue with CentOS. I can use vncviewer from CentOS to centOS. What's up ? Thanks, Jerry

1 0

how do I get an OLD Version like 6.3
by Jerry Geis 04 Aug '21

04 Aug '21

I need to example a really old version like 6.3. Where can I get a download for that ? Thanks Jerry

3 3

Newest kernel issue, C7
by mark 04 Aug '21

04 Aug '21

Just fullyu updated yesterday. The reboot gets past Centos (core)... and reboots. Repeatedly. messages *look* as though it got up... and then reboot. Any clues? mark

3 3

CentOS 8: two external network adapters, two ISPs - routing problems
by Konstantin Boyandin 02 Aug '21

02 Aug '21

Hello! Given: a CentOS 8-powered computer with three network adapters. eth0, eth2: external, connected to two different ISPs eth1: faces home network (intranet) The task: allow accessing certain internal services from either ISP. There are several services, I only mention SSH below. In the configs below: IP1: external IP at first ISP (ISP1), assigned to eth0 Gateway1: IP of gateway provided by ISP1 Network1,Netmask1: related to IP1 IP2: external IP at second ISP (ISP2), assigned to eth2 Gateway2: IP of gateway provided by ISP2 Network2,Netmask2: related to IP2 LocalSSHIP: IP in intranet (eth1) where SSH server is running Current configs follow. Routing tables: echo "200 isp1" >> /etc/iproute2/rt_tables echo "201 isp2" >> /etc/iproute2/rt_tables Routing policies: /etc/sysconfig/network-scripts/route-eth0 Network1 dev eth0 src IP1 table isp1 default via Gateway1 dev eth0 table isp1 /etc/sysconfig/network-scripts/route-eth2 Network2 dev eth2 src IP2 table isp2 default via Gateway2 dev eth2 table isp2 Routing rules: /etc/sysconfig/network-scripts/rule-eth0 from IP1/32 table isp1 /etc/sysconfig/network-scripts/rule-eth2 from IP2/32 table isp2 iptables snippets. External traffic forwarded to local SSH server from both interfaces: iptables -A PREROUTING -t nat -i eth0 -p tcp -d IP1 --dport 22 -j DNAT --to LocalSSHIP:22 iptables -A PREROUTING -t nat -i eth2 -p tcp -d IP2 --dport 22 -j DNAT --to LocalSSHIP:22 iptables -A FORWARD -p tcp -d LocalSSHIP --dport 22 -j ACCEPT eth0 is default gateway: $ ip route default via Gateway1 dev eth0 proto static metric 100 default via Gateway2 dev eth2 proto static metric 101 ... $ ip rule 0: from all lookup local 32764: from IP2 lookup isp2 32765: from IP1 lookup isp1 32766: from all lookup main 32767: from all lookup default SNAT is applied for the traffic originating from eth1: iptables -t nat -A POSTROUTING -i eth1 -o eth0 -j SNAT --to-source IP1 Current situation: - All services forwarded from eth0 are working normally. - All traffic originating from intranet passes out and back normally. - All the attempts to access services from eth2 time out. There are no obvious hints in /var/log/messages (such as complaints about "martian IPs"). I am somewhat at a loss here, all the pieces of advice would be very welcome. -- Sincerely, Konstantin Boyandin

3 2

It's been six days since CVD-2021-33909 was patched in RHEL, what's the holdup for Stream 8?
by Steven Rosenberg 29 Jul '21

29 Jul '21

This bug in the kernel was patched in RHEL on 7/20. Every other mainstream Linux distro patched it that day or the day after. That includes Rocky and Alma. https://access.redhat.com/security/cve/CVE-2021-33909 It's still not patched six days later in CentOS Stream 8. This Bugzilla entry makes it clear that when it comes to security, CentOS Stream falls behind RHEL. But this far behind? https://bugzilla.redhat.com/show_bug.cgi?id=1975182 This doesn't make a good argument for Stream being a viable CentOS Linux replacement.

3 5

Old CentOS 6.3 grub.conf
by Jerry Geis 28 Jul '21

28 Jul '21

I am trying to "add" an entry to grub.conf on CentOS 6.3 - and change the default=0 to default=1 # grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file # NOTICE: You do not have a /boot partition. This means that # all kernel and initrd paths are relative to /, eg. # root (hd0,0) # kernel /boot/vmlinuz-version ro root=/dev/sda1 # initrd /boot/initrd-[generic-]version.img #boot=/dev/sda default=1 timeout=5 splashimage=(hd0,0)/boot/grub/splash.xpm.gz hiddenmenu title CentOS (2.6.32-279.el6.x86_64) root (hd0,0) kernel /boot/vmlinuz-2.6.32-279.el6.x86_64 ro root=UUID=09337d96-de39-43f1-99c2-8a6a1fadd465 rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet initrd /boot/initramfs-2.6.32-279.el6.x86_64.img title Boot Other root (hd0,0) kernel /boot/vmlinuz initrd /boot/initrd I then run "grub-install /dev/sda" and reboot. If I cursor down - my new title is present - but the default is still the first title. What did I miss ? Thanks, jerry

1 0

heads up: stream8 cloud-init rebase 20 to 21
by Leon Fauster 27 Jul '21

27 Jul '21

FYI and everyone on C8S: cloud-init does run on deployed cloud vm's anymore succesfully after update (it was rebased from 20. to 21.). Fix: before rebooting run "cloud-init clean" -- Leon

1 0

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

Discuss