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

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“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 ...
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16 views

Changing CentOS 7 machines disables terminal access during background task

Based on this other posting, I typed the following command into a CentOS 7 terminal on a devbox that has the gnome GUI, and was able to continue to use the terminal for other commands while the ...
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46 views

linux + yum + how to print the yum variables by yum command

I just Wondering if we can print the yum parameters without to view the yum configuration files ( by more or cat or vi ... etc) for example I configured the variable , in /etc/yum.conf ...
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52 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/...
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24 views

Cannot add group on RHEL desktop

[root@notebook ~]# groupadd testing groupadd: failure while writing changes to /etc/group [root@notebook ~]# grep testing /var/log/audit/audit.log type=ADD_GROUP msg=audit(1465386369.617:2553): pid=...
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23 views

Should DNS (PTR Records) be configured differently for different ipv6 networks?

I am configuring DNS forward and reverse lookup for IPv6(Redhat). For both /64 and /120 prefix i am using below configuration for PTR records. for address 6b00:8a00:a000:11a1::a2b:1c9f (Only a ...
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32 views

rhel - file modification logs

I found a strange file in my /home/user named FireZeMissiles1111.tmp. I am the sole user and did not create it, so it is kind of suspicious. It may have been left there by a program who's programmer ...
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19 views

Using mail spool file for an entry in /etc/aliases gives errors in EL7

For years (with EL6 and before), I have successfully used entries like this in my /etc/aliases file: bugs: /var/spool/mail/bugs The idea being mail to a non-user can be shoved into a file for ...
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47 views

YUM: updating repo's GPG key

Haven't found the answer for this in docs: how often Yum refreshes the GPG key of a repo, if it was obtained from the net? For instance, I've got this repo config: [myrepo] name=myrepo baseurl=http:/...
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19 views

Prevent loop device partitions from being detected

I'm moving a work project from RHEL 6 (Kernel 2.6.32) to RHEL 7 (Kernel 3.10.0). The project involves the building of a raw disk image files to be used on virtual machines, these are representative ...
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11 views

Adding fcontext to unconfined application

This feels like the most horrid twist of fate ever... A user is having me setup tomEE (apache-tomee-jaxrs-1.7.4). This is on a RHEL6 machine. I've installed from the tarball available from apache's ...
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31 views

What does TCPRcvCoalesce, TCPAutoCorking and TCPHystartTrainCwnd in netstat mean?

We have some RHEL7 Apache reverse proxies that experienced a performance degradation event. After a few hours, restarting Apache restored performance to normal levels. We are trying to determine the ...
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23 views

Realtime Scheduling and hanging processes

This may be a "you are dumb" question, but at this point I'm hoping for just a new avenue to look down. We run some software on various systems at realtime priority (SCHED_FIFO, Priority: 99) To hit ...
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11 views

GNOME-SHELL tray with several rows

How can I make the tray use several rows, not just one? Using RHEL7.2
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24 views

Invalid script entry point, A callable suffix is required

I'm trying to install btrfs-sxbackup on RHEL7. It says: Installation: pip install btrfs-sxbackup Required: python3 I installed python34 from epel. There's no pip for it, so I installed it, ...
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43 views

Red Hat vNIC(Virtual NIC) association to physical NIC

I have a virtual network interface named bond0.700 connected to a vlan (ID 700), and 6 physical NIC (eth0 to 5) on RHEL 5.5. Hint : [root@rhle ~]$ cd /sys/devices/virtual/net [root@rhle net]$ ls -...
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40 views

Methods to find out what remounts /sys readonly (RHEL 6.7)

A few colleagues intermittently have issues with suspending/hibernating their computers (running RHEL 6.7, normal workstation install, nothing special). As it turned out, the problem was that /sys was ...
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17 views

Google map api and rhel proxy server

I have a RHEL virtual server that connects to our corporate environment via a proxy server. Using a Google Map API from my desktop, which sits within the corporate environment, retrieves data ...
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15 views

Recreating local selinux contexts after OS Reinstallation

We have added a few specific contexts to our SELinux via the "semanage fcontext ..." command. The patterns are stored in /etc/selinux/targetd/contexts/files/file_contexts.local. Assuming that we ...
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26 views

Permanently Configure two X Servers

I'm trying to permanently configure a second X server to start at runtime on RHEL 7. I am aware that I can start a second x server using startx -- :1 vt 2, but I'd much rather integrate it to the xorg....
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57 views

sar/sysstat output logs to a 2nd directory

We're running RHEL on one server and I need to report some stats about the machine. sysstat/sar does a great job but I need the logs to report starting with 6am until next morning at 6am and output ...
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72 views

gdm Pop-Up Window on Login

So I was using a bit of bash script to get a popup window to appear on login for our RHEL 7 machines. I put the following code in "/etc/gdm/PreSession/Default". /usr/bin/zenity --warning --title="...
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339 views

Redhat error while loading shared libraries: libkeyutils.so.1: cannot open shared object file: Permission denied

I just installed and am trying to start rpcbind on my redhat 7 machine. I'm new to linux so I'm having some trouble figuring out what to do next. I'm running all of these commands as the root user. ...
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239 views

RHEL 7 Still CPU Frequency Scaling

When machine is imaged with: RHEL6.x CPU speeds report full 3.3Ghz speed for all CPUs cpupowerutils is not installed RHEL7.x CPU speeds vary (shown in example below) cpupowerutils is installed ...
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28 views

Identifying disk drives during RHEL/CentOS/Fedora Installation

What steps are followed in order to identify a connected disk drive during Linux installation ? I am interested RHEL/CentOS/Fedora procedures. Is it entirely depends on the Kernel package and drivers ?...
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69 views

problem while using “ yum groups ”

When i am trying to use yum groups commands in RHEL 7 it is giving me following output. #yum groups list There is no installed groups file. Maybe run: yum groups mark convert (see man yum) I have ...
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108 views

Memory Leak trackdown

I have a server running Red Hat Enterprise Linux Server release 6.7. The server runs a number of java processes including a tomcat server with nginx webserver. The server has 12 GB of ram allocated ...
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24 views

Connecting a Redhat virtual machine to the host NIC that uses network bonds

I'm running Redhat 6.6 on severs with multiple interfaces. And I am successfully using network bonds on the interfaces to connect with the different VLANs on the existing network. The servers are ...
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20 views

Virtualbox Guest Additions packages?

As I move to look at virtualbox for the small/medium business where I've used vmware previously, I'm interested in a proper kickstart for my RHEL5/6/7 hosts. I'm used to using proper vmware guest ...
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143 views

Mounting Sharepoint folders in Linux

We are using DAVfs to load a Share Point folder in our environment. We installed both neon and davfs libraries to try mounting. On mounting, we are running into the below. Any suggestions? Could not ...
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92 views

Are docker container security limits limited by the host's security limits?

Lets say that I have a host which has max locked memory set to 64kb: [root@host]# ulimit -l 64 and a docker container running in that host with no limits: [root@container]# ulimit -l ...
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45 views

RHEL 5 Kernel Panic

I performed some fdisk operation on vmdisk. After rebooting I got the following error: unmounting old /dev unmounting old /proc unmounting old /sys switchroot: mount failed: No such file or directory ...
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158 views

Java related error met when installing COMSOL

I would like to install a software called COMSOL on Redhat (Red Hat Enterprise Linux Server release 6.4 (Santiago)) cluster. COMSOL is designed as a Windows software, and its installation requires X ...
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41 views

Can't determine where umask is being changed

On my RHEL system, my /etc/login.defs has the line UMASK 077. I have one user who has a .cshrc which changes his umask to 022. I also have a second user who does not have a .cshrc or .bashrc or any ...
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enabling and accessing multiple comports in RHEL 6.6

I am using a motherboard with The Intel Haswell platform I have installed RHEL 6.6 in it the board is having six comports. I am unable to access more the 2 comports. What kind of setting do I need to ...
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How do I get new filesystem formats to use in mkfs?

I am currently attempting to run some benchmark tests using different filesystem formats. However, I can only use the ext family, cramfs, and msdos formats with mkfs since those are the only formats ...
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119 views

lp prints blank pages for pure text file

Printing a text file through lp result in blank page while printing same file through gedit works fine. lp is able to print pdf and jpg image files, but not text file. On further looking in to ...
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52 views

Get window name on Red Hat GNOME

Is it possible to get the title of a window (e.g., gnome-terminal) via a terminal command, without installing any outside packages such as xdotool, xprop or wmctrl? Much appreciated.
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96 views

Recover VG after Adding Disks and Rebooting

I had an old 1.5 TB NTFS formatted disk I wanted to use in by RHEL 7 box, so I put it in my desktop booted, and proceed to delete the partition table using fdisk. I created a physical volume on it ...
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640 views

receiving error message while trying to register for subscription for rhel6

I am trying to subscribe to redhat from the terminal. I have registered an account at https://access.redhat.com/labs/registrationassistant/ . So I am using those credentials to register my ...
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28 views

Getting some unwanted message in linux os

When Linux (RHEL) OS is booted I am getting a message as beiscsi_ep_connect shost is null What does it mean?
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3k 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 than rather than compile every time, it may be better ...
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748 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)...
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59 views

Input focus not following window clicks

I'm running RHEL 6.5 with a generic ATI HD5480 videocard and three monitors (one connected to each port... DVI, DisplayPort, and VGA), and I'm having issues with window-activation and input-focus that ...
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211 views

How to corrupt rpmdb?

Yes, You read it right i actually want to corrupt RPMDB for testing purpose. I tried Googling it but all i got was to, how to rebuild it. So at last i tried rpm --rebuilddb and killed the process ...
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167 views

RHEL6 Idle Thread Behavior

I am doing some cpu performance profiling with the perf tool on a RHEL6 box running weblogic12g. It looks like the idle threads are presented as native_safe_halt in the stack profile but ...
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610 views

Why does my redhat 5.11 system have so many ext4-dio-unwrit processes?

I have a redhat 5.11 system running, and it looks like there are 32 of these processes. What are they, and why are there so many of them?
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63 views

Cannot resize windows remoting-in through X11VNC?

As title says, I am remoting on to a Linux box (CentOS 6) using X11VNC. However, I cannot resize any windows manually by hovering over the frame, because the frame resize cursor does not appear. ...
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37 views

How to monitor the “raw” port of the bonded network in RedHat 4/5?

I currently having a bonded network labelled "bond0" consisting of two ethernet ports on the server. But the physical server is currently hosted on a offsite data centre, which i can't easily accesss. ...
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How do I run a application on top, in a display manager like GDM.(RHEL 7, Gnome 3.8.4)

I want to show keyboard layout and selection of language at login screen in RHEL 7. I have modified the language menu to show "show keyboard layout" and "Region & Language settings". On clicking ...