Questions tagged [redhat]
Red Hat is an open source technology solutions provider with offerings including Red Hat Enterprise Linux, open source applications, security and systems management, virtualization, Services Oriented Architecture (SOA) solutions, server and desktop operating systems, Java application software and services, and the JBoss Enterprise Middleware Suite. Please also consider whether or not the more specific RHEL5 or 6 tags might be appropriate as well.
3,345 questions
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"Failed to connect to system scope bus" after dnf update
I run a Rocky Linux 10 VM. Today I did a dnf update. After that the system behaves strange. I cannot shutdown -r now or reboot. Entering systemctl daemon-reload gives me:
Failed to connect to system ...
- reputation score 123
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129 views
HAProxy Routing Phantom Connections To Redis Sentinel Nodes In Down State
Twice in the past couple of years I’ve encountered an unusual issue whereby after a failover in a Redis Sentinel cluster, HAProxy has seemed to continue to route phantom connections to a node that is ...
- reputation score 129
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73 views
"CSV owns resources that require a cert refresh" prevents DataGrid operator from upgrade
I chose to post this on ServerFault because topic is more INFRA related than APP related. Forgive me if more appropriated for Stackoverflow
As part of periodic patch process to the application I am ...
- reputation score 2417
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365 views
Trouble Netbooting RHEL 10.0 over HTTP / iPXE / GRUB on older CPUs
After some time, I decided to update my install server to the latest RHEL releases (8.10, 9.6, 10.0).
There were no issues with releases 8.10 and 9.6, but with release 10.0 I encountered a problem.
...
- reputation score 101
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157 views
Unbound Cache Stats Not Increasing - still Showing Same Hits/Misses After Days
We configured Unbound on a RHEL-based server ( RHEL 7.9 ) to provide DNS caching. Here’s the relevant part of our /etc/unbound/unbound.conf:
server:
chroot: ""
verbosity: 1
port: ...
- reputation score 739
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88 views
I need RedHat to use default gateway on LAN NIC but still route WAN traffic out other NIC
RHEL 7.9 (will be upgrading soon). It's purpose is to host a commercial java based server/client app. The machine has two NICs: one for private LAN and one for public internet WAN. The purpose of the ...
- reputation score 11
Score of 4
1 answer
424 views
Restrict a Firewalld service to a certain interface IP address
I want to allow JSON-RPC connections to a bitcoin server, but only from a certain interface IP address.
I did edit the bitcoin.conf file with a strong user:password and the other necessary parameters ...
- reputation score 538
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143 views
High TCP retransmissions from RHEL 8.6 client (BBR) to RHEL 7.9 server (Cubic) during iperf3 test [closed]
We're testing TCP performance between a client and server using iperf3 in a controlled environment.
Client: RHEL 8.6 with BBR congestion control enabled
Server: RHEL 7.9 using default Cubic congestion ...
- reputation score 739
Score of 0
0 answers
154 views
Why are there still DHCP records for NetworkManager in the logs even though the NetworkManager service is disabled in Almalinux 9.6?
I disabled the NetworkManager.service and enabled traditional network-scripts on AlmaLinux 9.6. Why does NetworkManager still perform a DHCP request during system startup? This causes the eth0 network ...
- reputation score 1
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1 answer
595 views
AlmaLinux 9 custom image EFI boot from USB stick on Gen11 DL360- kickstart file not found?
I have built a custom version of the AlmaLinux 9.6 ISO image, adding files to it including many pre-made kickstart configurations in /ks/*.cfg. Each kickstart file is referenced in the GRUB config by ...
- reputation score 270
Score of 1
1 answer
1000 views
Kernel Panic on AlmaLinux VM Boot in VirtualBox – "Attempted to kill init! exitcode=0x00007f00"
I'm trying to boot an AlmaLinux virtual machine in VirtualBox, but I encounter a kernel panic during the boot process. The error message is:
[ 6.3120771] ---[ end Kernel panic - not syncing: ...
- reputation score 13
Score of -4
1 answer
279 views
pacemaker drbd resource not getting unpromoted at standby node
I am a Linux engineer currently testing a Pacemaker cluster with DRBD.
I have completed the resource configuration, but during failover testing, the standby node fails to start the DRBD resource due ...
- reputation score 1
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73 views
Guest VM cannot access Internet in linux kvm
After creating a VM, the VM cannot access the Internet.
In Hypervisor RHEL 9.4:
I created management network:
virsh net-dumpxml management
<network>
<name>management</name>
<...
- reputation score 11
Score of -1
1 answer
204 views
Journalctl logs & name resolution
We are debugging the logging of some services, such as the moving_data_to_hdfs.service, on our RHEL 7.6 machines.
We ran the following command:
journalctl -u moving_data_to_hdfs.service >/log.txt
...
- reputation score 739
Score of 1
1 answer
475 views
How to set up SSO for PostgreSQL 16 on RHEL 9, without creating new database users?
I need to set up Single Sign-On (SSO) for a PostgreSQL 16 database running on a RHEL 9 Linux server. My goal is to provide passwordless access to users who are part of a particular domain (for ex: ...
- reputation score 161