Questions tagged [rhel]

Red Hat Enterprise Linux (RHEL) is a commercially supported Linux distribution.

1,010 questions with no upvoted or accepted answers
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9
votes
2answers
187 views

Shell dropping every other character of input

I manage software on a bunch of RHEL 6.10 VMs, typically either as a service account or root using sudo -i. Periodically, my shell starts dropping every other character. For example, if I type cd /usr/...
8
votes
0answers
2k views

Ethernet bonding round-robin not work when 1st interface down

I'm trying to understand the bonding mode=0 (load balancing round-robin). Using eth0 & eth1, I created bond0 interface as the configuration below : root@test-env1:~# cat /etc/sysconfig/network-...
7
votes
1answer
2k views

NFSv4 Errors, But Not in NFSv3

I'm working on an NFS solution for RHEL6.5 clients (all VMs) with RHEL6.5 and RHEL7 hosts. Currently, the RHEL7 host with RHEL6.5 clients works fine. The trouble is with the RHEL6.5 host. These ...
5
votes
1answer
178 views

How can I find what a process is trying to watch using strace, lsof, and fdinfo?

I have a process (the NewRelic infra agent) that is hung on a RHEL 7, xfs filesystem host. I'm thinking that it's trying to watch a file or maybe a socket that another process already has in use. ...
5
votes
1answer
283 views

realmd vs authconfig

What is the difference in functionality between realmd and authconfig? (using fedora 22) What is the correct way to connect to an active directory realm with using Kerberos and using SSSD server?
5
votes
1answer
2k views

Can't disable SSLv3 in Apache + mod_nss

I am trying to implement TLS through mod_nss in Apache (RHEL 7). As per the documentation, I have installed mod_nss and removed mod_ssl. I have followed the steps outlined in the documentation (see ...
5
votes
0answers
2k views

How do I add modules, binaries or scripts to initramfs in RHEL distributions?

I have an initramfs script I developed for Debian distributions that required some extra binaries to be loaded into the image. I'm now trying to port this to RHEL distributions and I'm struggling. To ...
5
votes
1answer
7k views

How do I disable network interfaces from loading at boot without Network Manager?

The machine I'm using has 4 network interfaces, only one of which is currently being used (the other 3 are not plugged in at all). Currently when the machine is restarted it is delayed by a few ...
5
votes
0answers
331 views

Enable sqlite FTS Enhanced Query Syntax in python in RHEL6?

SQLite's full text search engine offers a simple query syntax (with AND and OR operators and -term for negation), as well as an enhanced query syntax which also allows parenthesis and NEAR — as well ...
4
votes
0answers
942 views

What happens when you disable NFS server delegation?

We are facing issues with NFS 4.1 on RHEL 7.6. We have a lot of applications on this server and GitLab is one of them and it is impacted the most. Excessive NFS network traffic (due to a bug with NFS ...
4
votes
0answers
960 views

Working out what is causing my machine to freeze

Background For a few years now, I have been having problems with my Xeon workstations freezing. For many things they have been lightning fast, but sometimes applications or even the desktop just ...
4
votes
0answers
1k views

How to assign e1000e driver to Ethernet adapter

Is there a way to instruct an Ethernet adapter to use a certain driver? Or perhaps the way it works is to have a way to instruct a driver to support a specific adapter? I have a system running a ...
4
votes
2answers
2k views

How can I install the unity-desktop on Red Hat?

I am using a computer system with the gnome desktop system, with which I am not able to work properly (resizing of windows does not work etc). Therefore I would like to install the unity-desktop. Is ...
4
votes
0answers
1k views

Limit Openldap Transaction Log Disk Usage

Openldap (specifically version 2.4) stores transaction history in log files by default in the ldap data directory (so /var/lib/ldap/log.###########). Currently these log files take up a lot of space, ...
4
votes
0answers
1k views

Failed UDEV rules test on Oracle Linux 7

I wrote my UDEV rules, to configure asm devices as shown: KERNEL=="sd?1", SUBSYSTEM=="block", PROGRAM=="/usr/lib/udev/scsi_id -g -u -d /dev/$parent", RESULT=="1ATA_VBOX_HARDDISK_VB40696d3c-4b65a1e9", ...
4
votes
2answers
3k views

How to create an SELinux exception for individual files

I use a monitoring tool and on one of my systems that is checked remotely, it calls up a script, which in turn runs systemctl to check the status of a service. This was not working until I put SELinux ...
4
votes
0answers
14k views

Installing custom RPM says “does not update installed package”

I've inherited some servers which have previously always had its software as custom compiled versions (apache, perl, mod_perl etc). I was thinking rather than compile every time, it may be better to ...
4
votes
0answers
455 views

Limit system processes using cgroups

My server runs several dozens of processes that are not in my control (mostly monitoring software). According to my application logs, sometimes some of the third party processes try to allocate too ...
4
votes
1answer
3k views

turn on numlock at login screen. GDM

GDM is turning off numlock key. I have tried following: a) installing numlockx and inserting following lines at /etc/gdm/Init/Default if [ -x /usr/bin/numlockx ]; then /usr/bin/numlockx on fi b)...
4
votes
0answers
986 views

Why does saving a KVM-QEMU VM requires additional memory?

I have three VMs running on Red Hat Enterprise Linux with 8 GB RAM, each of the VMs has 3 GB allocated, and I also run a 512 MB VM. If we also consider the guest OS's memory usage (usually 1.5 GB due ...
4
votes
0answers
10k views

Unable to start network, <IP> is already in use for device eth0, but its not

A weird issue after we migrated some of our servers to a new DC. We assigned new IPs to all the machines and all the servers are working fine except one. It is not picking up the new IP address and ...
4
votes
1answer
149 views

Make one VNC server appear as two displays in RHEL

I have a VNC server running in virtual mode in RHEL and I am viewing it on a PC which has two screens. I can make the server use both of my screens by setting the resolution large enough: xrandr -s ...
4
votes
0answers
3k views

mailx attachment behaviour between RHEL 5 and RHEL 6

We have a line of code that does this in ksh, to send a file as an attachment in email: uuencode <filename> <filename.txt> | mailx someone@somewhere.com In RHEL 5.2 mailx sends ...
4
votes
0answers
3k views

“Remote function call interrupts” (CAL in /proc interrupts). What is it?

I'm running a test program which generates a large number of threads and asynchronous I/O. I'm seeing very high counts of these interrupts in /proc/interrupts, the program cannot scale beyond a ...
4
votes
0answers
409 views

How do I set up dual quadro cards in RHEL 5.5

I have a RHEL 5 workstation with 2 nvidia Quadro FX4500 cards, with one display attached to each card. After doing a clean install of RHEL 5.5, the second display doesn't work (it worked ok in RHEL 5....
3
votes
0answers
29 views

Which namespaces are the executable specified by `release_agent` executed in, when the last task leaves the cgroup?

Reading the documentation for Linux cgroups, I've come across the notify_on_release flag and how it relates to release_agent, i.e. the kernel runs the executable specified by release_agent, if ...
3
votes
0answers
2k views

FIPS integrity test failed on RHEL 7.5 with 4.X kernel

I have a Dell PowerEdge R7425 with Intel NVME P4500/P4510 NVME drives. On the 3.10 kernel, the NVME drives throw I/O errors very frequently, and these errors have led to a system halt once already. I ...
3
votes
0answers
1k views

RHEL 6.8 installation of user specific python 3.7 completes with 'ModuleNotFoundError: No module named '_ctypes'

I do not have a subscription to the RHEL repos at this time. I am using EPEL for packages that are needed. Goal: I am attempting to setup multiple virtualenv folders for testing purposes. I have ...
3
votes
1answer
404 views

sssd or ldap.conf doesn't work without a bindDN and password in RHEL 5, but works in RHEL 6 and 7. Why?

I am trying to use LDAP for authentication. I see it doesn't work with RHEL 5, if we don't provide a bind DN and password, but works in RHEL 6 and 7. From sssd logs, I can understand that it is ...
3
votes
0answers
960 views

CIFS mount no longer working

I have several RHEL6 systems with the same configuration. I have had CIFS mounts working for years. However in the past month, it has stopped working on one of my systems and I cannot seem to figure ...
3
votes
1answer
1k views

Kernel parameters are not changed permanently for RHEL7

Trying to permanently change some vm kernel parameters, I created /etc/sysctl.d/01-custom.conf config file as it described in Red Hat knowledgebase article. Here is its content: # cat /etc/sysctl.d/...
3
votes
0answers
131 views

zfs pool not available on boot after setting noatime and drive idle times with hd-idle / hdparm

At first, I set up my RHEL7-x64 to sleep the zfs drives using this,this, and this. I believe I tried hd-idle first, when the problems began. I had written a script idle_drives_enable to handle ...
3
votes
0answers
995 views

Mysterious TCP connection when using NFSv4

When using NFSv4, I expected that all traffic would be on port 2049. This seemed to be the behavior in RHEL6. However, in RHEL7, when a client makes a connection to a server on port 2049, the server ...
3
votes
0answers
895 views

How to get persistent (permanent) smb mount using kerberos authentication on RHEL7?

Environment: I have joined a few of my RHEL 7.3 boxes with MS AD domain using realmd/sssd. I have allowed only members of a few allowed groups can login to the box. Credentials caching is disabled. ...
3
votes
1answer
1k views

System Usage 80% and User CPU usage 20%

Company purchased HP Gen 9 Server to be used for Oracle Applications. Today while doing daily system check Top show that System Area CPU Usage is 80%(Certainly not normal)while User Area Usage is 17-...
3
votes
0answers
838 views

Use of cores with `isolcpus` and `cpuset` TOGETHER

I work with a Red Hat Enterprise Linux Server release 6.9 (Santiago) (I don't manage it). In the GRUB config file we have, let's say, isolcpus=2-32 (out of 36 cores). I also have a cgroup with cpuset=...
3
votes
1answer
223 views

How to create a consistent forensic image from a live RHEL system?

In our environment we have RHEL7 systems that need to be always up and running. I know the preferred method of acquiring a forensic image is to take the system offline, but in case of a live image, ...
3
votes
1answer
2k views

su cannot open session error when starting Oracle XE database

I have a RHEL 7.2 server with Oracle 11g Express Edition (11.2.0) installed. The installation of Oracle created a file named "oracle-xe" in /etc/init.d This is a bash script that can be used to ...
3
votes
0answers
3k views

Why is my network unreachable in virtual machine with RHEL 7.2?

I got a 30-Day evaluation of RHEL 7.2. I installed into a VirtualBox machine, and tried to register my subscription: # subscription-manager register Registering to: subscription.rhn.redhat.com:443/...
3
votes
0answers
510 views

Linux + why dropping issue displayed from ifconfig but not from ethtool?

we have Linux VM red hat 7.2 version with two LAN interfaces the Linux machines are ruining on ESXi - 5.5.0 and we have very strange issue , the conflict is between the ifconfig command to ethtool ...
3
votes
0answers
705 views

e1000 driver update with interfaces gone

Intel server with 3 LAN cards. Board Mfg : Intel Board Product : S5000PHB 06:00.0 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet Controller (rev 06) 06:00.1 ...
3
votes
0answers
647 views

FIPS mode, signature verification failed

I am building a kernel with FIPS mode on. I followed most of the procedures described on Red Hat documentation here. I also created a hmac signed .vmlinuz file. After installing dracut-fips and ...
3
votes
0answers
415 views

Absolute domain names in /etc/hosts?

I have a RHEL7.0 host which has this standard entry in /etc/hosts/: 127.0.0.1 localhost.localdomain localhost So resolving localhost.localdomain works: $ ping localhost.localdomain PING localhost....
3
votes
1answer
7k views

WBC_ERR_DOMAIN_NOT_FOUND only for a specific account

Platform: RHEL 5.10 Version: Samba 3.6.6-0.136 Only on a single VM, one of my co-workers is able to log into the VM using his AD credentials without issue, whereas my account appears to have trouble ...
3
votes
1answer
7k views

Error building Oracle client 11g R2 on RHEL 5.5

We are trying to install oracle 11g R2 64 bit in Rhel 5.5 machine ( 64 bit ). Kernel version is 2.6.18-194.el5. We are getting the below error while installation. error in invoking target 'mkldflags ...
3
votes
0answers
529 views

How to set CONFIG_PREEMPT_NONE in RHEL 6.4 (linux)

I am trying to tune the RHEL6.4 Kernel to handle server style load for of my application. With RHEL 6 scheduler has been changed to CFS and with RHEL 5 my application works fine. I would like change ...
3
votes
1answer
917 views

GDM will not start on boot, unable to login into graphical interface

I am running RHEL 5.8 . SELinux is enabled but in permissive mode. Here are some snippets from /var/log/messages on boot. kernel: type=1400 audit(1360613500.551:6): avc: denied { write } for pid=...
3
votes
4answers
2k views

Installing Postfix conflicts with MySQL-server package

I had to install MySQL Server community on our server (team lead did not want MariaDB due to support or something). Therefor I removed MariaDB which in turn also removed Postfix. Now I need to ...
2
votes
0answers
30 views

How can a device be mounted on several mount points, while directory listings for the mount points list different files?

Consider the device called /dev/mapper/systemvg-varlv. It's mounted on /var, /var/lib/docker/containers, and /var/lib/docker/overlay2 and its filesystem is XFS. If the same filesystem is mounted on ...
2
votes
0answers
87 views

bash + how to avoiding duplicate entries in authorized_keys (ssh) in bash

Popular methods of adding an ssh public key to a remote host’s authorized_keys file include using the ssh-copy-id command, and using bash operators such as >> to append to the file. An issue ...

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