Questions tagged [redhat]

Question 1

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 ...

Question 2

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 ...

Question 3

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. ...

Question 4

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: ...

Question 5

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 ...

Question 6

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 ...

Question 7

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 ...

Question 8

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 ...

Question 9

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 ...

Question 10

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: ...

Question 11

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 ...

Question 12

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> <...

Question 13

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 ...

Question 14

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: ...

Question 15

Recently, since upgrading to use Red Hat IDM (FreeIPA) instead of NIS, we had to shut everything down for a scheduled day-long power interruption to our site. Starting up again, there was a problem. ...

Question 16

The Plot We're setting up a Kubernetes enviornment using RedHat's OCP. The application that we've been given from our provider in the form of Helm charts and container images, provides a pod that ...

Question 17

Sometimes files on our RHEL 7.9 host are zero after a power failure. Is there is a way to avoid this issue? Here is an example of the files after an OS power-off: The following files exist under /opt/...

Question 18

i have a problem with selinux enabled (set to enforcing) on our new RHEL-9 machine. We use there apache webserver (httpd) and ZeroMQ. In our custom apache *.conf file we load a module for ZeroMQ. With ...

Question 19

We have a cluster with Huawei machines running RHEL 7.9. and mellanox network cards From time to time, we notice that the NICs on these servers stop functioning, and the only way to resolve the issue ...

Question 20

We have configured the BBR settings on all our RHEL 8.6 machines as follows: (according to Red Hat's documentation [https://access.redhat.com/solutions/3713681]). The goal is to assess whether the BBR ...

Question 21

We are using 15TB disks on our RHEL 8.6 Linux servers. These disks are for the HDFS filesystem. Compared to other disks like 4TB or 8TB, we are noticing some degradation in the logs of the datanode. ...

Question 22

Firstly, I'm not using IPv6 on my server, and IPv6 is being disabled. However, if I run firewall-cmd --list-all-policies, I can see there's a default policy called allow-host-ipv6. What does it ...

Question 23

we have 342 RHEL 8.6 machines and all machines are with the same situation when systemctl service took much more memory then the PID itself systemctl status presto.service ● presto.service - Perforce ...

Question 24

I want to install HPE Linux management software on a gen8 microserver. In the past it has been suggested to use the YUM repos for RHEL. Now that centOS and Almalinux exists the situation is more ...

Question 25

I want to share the following issues. In iperf3, the default TCP window size is automatically managed by the operating system unless you explicitly specify a window size using the -w flag. I want to ...

Question 26

we have DELL machines with Seagate disks according to Seagate data transfer rate is 260 MBps speed - particularly for read or write Understanding the 260 MBps Metric: MBps stands for Megabytes per ...

Question 27

A Self-Encrypting Drive (SED) is a type of hard drive or solid-state drive (HDD or SSD) that has built-in hardware encryption capabilities. This means that the drive automatically encrypts and ...

Question 28

I have a REST API written in Python which upon a request runs an executable written in C++. This C++ code is really the main component but it can only be compiled and used on Windows. However, ...

Question 29

We are running self-hosted gha runners on RHEL 9.4. They are creating a shared memory section with world-writable permissions. I assume that the runners use this to communicate among themselves. The ...

Question 30

and hope someone can help me.....I'm pulling my hair out!! CLIENT TERMINAL: RHEL8 SERVERS: RHEL7.9 xrdp 0.9.21 tigerVNC Scenario: From the client RHEL8 terminal, attach to SERVER_A via RDP. A ssh ...

Question 31

I have a Red Hat 8.10 Server running OpenLDAP Server 2.4.46 configured for TLS over port 389 and a self-signed certificate. I'm using sssd for authentication. On the LDAP Server, id (username) works. ...

Question 32

I am new to OpenStack. I am migrating a server from OpenStack to VMware. I created an image/snapshot with: openstack server image create --name Odoo_v12_ubuntu_v18Snapshot Odoo_v12_ubuntu_v18 then by ...

Question 33

I'm going through the process of updating Sendmail for some alerting. I.E. something happens, sendmail sends us the email of the error, we fix it. We're running into issues where those emails aren't ...

Question 34

I'm trying to get my dhcp server configured, but having some issues. In my dhcpd.conf I have two ip pools defined under my subnet declaration. my dhcpd.conf is like this: class "pxeclients" {...

Question 35

i'm experiencing this issue across differents physical server, let me describe it better. PHYSICAL HOST OS: Rhel 8.10 (also tested on rhel 8.8) VM OS: Rhel 8.10 I've created a lot of VMs based on RHEL ...

Question 36

I read a lot of discussion about investigating NFS using Wireshark but it doesn't give me a "global" view of all files accessed by NFS. On the NFS server I know that NFS process use a lof of ...

Question 37

In the past hdparm command was working great. but now when we type it we have the following ouput (nothing) : [root@XXXX ~]# hdparm -t -T /dev/sda3 /dev/sda3: then it is stuck. I can exist the ...

Question 38

I don't have iotop, atop or any non Redhat tool on Redhat 7.9. Is there a way to investigate which process is consuming all hard drive access? I don't have gnome installed so I don't have access to ...

Question 39

The OS is RHEL 9.5 and is a physical server. /etc/group is set with rsa:x:772:user.one,user.two at the bottom of the file. It has 644 permissions. In /etc/sudoers.d/ There is a file named rsa with ...

Question 40

I have a registered RHEL9 VM and recently I have cloned a copy of it by restoring from the latest Veeam backup. Then I changed the IP, gateway, also /etc/hosts file and regenerate /etc/machine-id file ...

Question 41

RHEL 9.4. Running passwd accountName comes back with: passwd Authentication token manipulation error. journalctl -xe gkr-pam: couldn't update the login keyring password: no old password was entered /...

Question 42

I have Intel Software RAID (Intel® VROC) configured on my Red Hat host machine, and I would like to access its status etc within a Debian-based KVM guest VM. [root@localhost ~]# mdadm --detail-...

Question 43

I have a RHEL 7.9 server. I am trying to create a local account called sysadmin. I ran useradd sysadmin usermod -aG wheel sysadmin passwd sysadmin When I look in /home I see the sysadmin folder, but ...

Question 44

I am trying to install CSSH on RHEL9 in WSL, I tried below and getting error. Any Ideas [root@aaa rhel9]# dnf install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm Updating ...

Question 45

I am using OL9.2 and libvirt version: 10.0.0 I am trying to add an vm to autostart with sudo virsh autostart <vm_name>. On host reboot vm did not start and virtqemud shows this log: virtqemud[...

Question 46

We have a DELL server with iDRAC (Integrated Dell Remote Access Controller). Usually, hardware problems related to controllers, storage, or disks are viewed through iDRAC. However, in our case, we see ...

Question 47

I have had the following suggestion for my Servers on the insights client. SSH security is decreased when insecure cipher or hmac is enabled in the crypto policy The playbook remediation doesn't seem ...

Question 48

I use AlmaLinux 9, I understand that there is new backend service nftables which can be managed by iptables-nft command, so I set some rules and my rule set looks like: # Warning: table ip nat is ...

Question 49

I try to join a RHEL 8 machine to the domain of a Windows Server 2019 domain controller using realmd. The join kind of works, a computer account gets created in active directory, but I am not able to ...

Question 50

RHEL8. I need to forward only sip/tcp and rtp/udp packets from ens192 to ens0. But for testing I am trying to forward all traffic from ens192 to ens0. ens192 is the main int of VM, IP - 10.10.10.3 ...