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

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How to get back a lost session in RHEL : Using NoMachine

I logged in remotely to RHEL using NoMachine. Suddenly it got stuck and I have to close the NoMachine client. When I logged in again using NoMachine I can't see the old session (I can't see same ...
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244 views

Permanently enable scl for RHEL6 RedHat

RedHat provides a way to install packages with newer versions of packages than officially supported with Software Collections. After the installation of a software collection it is necessary to enable ...
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329 views

Service httpd is failing to start - fcgid can't create shared memory

I'm not sure why, but when I try to start the httpd service, it will not start. Server config: OS: CentOS 5.10 PHP: 5.5.7 Apache: 2.2.3 I built mod_fcgid from source, put it into the ...
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230 views

Listing previous logins through sftp

Hello people of the stackexchange, I am having a little difficulty trying to find a location of a particular log file which i'm hoping someone on here could help me with. What i am trying to do is ...
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45 views

Send big data with dsmigratedata command

I want send data to remote server using this command but I dont know what is the syntax is that I can use for this command... I'm using the command: $ dsmigratedate -s user@remoteip -p 22 password ...
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244 views

How different is I/O handling of hard disk in AIX and Redhat Linux?

I am running a hadoop I/O workload in redhat linux and have ran that in IBM AIX as well with same underlying hardware, disk and disk configuration. With the default settings on the os redhat linux is ...
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133 views

RHEL6 LDAP client not listing all the groups

Using sssd I have a RHEL6 client configured to login using LDAPS. The login works, but if the user logged in is assigned to more than 1 group at the LDAP level, groups only returns 1 group? Could I ...
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3k views

Undefined reference to gzopen64 when building samtools

I am trying to install the software package samtools0.1.19. When I run make, I get errors: gcc -g -Wall -O2 -o samtools bam_tview.o bam_plcmd.o sam_view.o bam_rmdup.o bam_rmdupse.o bam_mate.o ...
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121 views

Identifying MaxSpeed of a Bonded Interface

I have configured Ethernet Bonding for our RHEL 6.2 Servers. Bonding is working fine but few confusion for me when I configured MRTG to monitor the bonded interface. MRTG is showing MaxSpeed of the ...
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194 views

after enabling Xinerama (in AMD condor Dual-Head Graphics Card) the system graphics hangs

I have a problem in my AMD Condor Dual-Head Graphics Card When I enable Xinerama from "System → Preferences → AMD Catalyst Control center (Administrative)" my RHEL Server 6.3 (x64) Graphics hangs. ...
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512 views

How to switch user if the Screen is Lock

Sometime this happen that when I had to do something on server I find that the screen is lock and I dont know the password of that user to unlock it and switch the user. So i need to know that How to ...
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1k views

Can't ping first IP with dual NICs on different subnets with multiple gateways

I have two NICs assigned to a server. eth0 - 10.199.10.0/24 w/ a GW of 10.199.10.1 eth1 - 10.199.20.0/24 w/ a GW of 10.199.20.1 From my desktop, I can ping the IP assigned to each NIC just fine ...
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449 views

Negative hdd usage. Available is larger than fullsize

Having issues with space accounting of lvm volume. 23G is available. But the full size of the partition is 20G. (So, it shows "-4.1G used" 0_O) > df -h Filesystem Size Used Avail Use% ...
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218 views

not all initrd.img's are born equal?

I am trying to get a Red Hat 5.8 box booting via pxe. The box is a virtual machine on ESX5.0 it has a Paravirtual SCSI Controller and VMXNET3 network driver. Now these drivers do not come default in ...
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504 views

RHN Satellite scout won't push

My RHN Satellite (Spacewalk) server is having issues with monitoring. The Spacewalk Monitor Scout will not push out successfully. It always stops with a Request Expired status. I can't seem to find ...
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999 views

iptables not starting up

I have inherited a custom built Linux kernel 2.6.30.9 and am just upgrading the underlying OS from RHEL 5.4 to 5.8 (kernels 2.6.18.164 and 2.6.18.308 respectively). When booting, the following is ...
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119 views

How to recover a multiboot configuration after having installed Windows 7?

I've installed Windows 7 and XP on my laptop. After that, I installed RedHat 5. Now the problem is that I'm not able to load my RedHat. What should be done to fix this problem?
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98 views

Some of the users login screen do not display colors

In my lab I have Redhat Enterprise Linux 5 server. Users log in through telnet for C programming Some of the users' login screens display colors, while some other users login screen do not ...
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598 views

Can't make a copy of /var/lib/mysql/ibdata1

I have a RedHat Linux server and I'm trying to make a copy of /var/lib/mysql/ibdata1, but I'm receiving an error saying permission denied and the file cannot be opened. I'm logged in as root user and ...
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222 views

Flash drive not working on a particular RHEL machine

I have a 32 Gib flash drive. The first time I copied files to it, it failed with a write error and the drive was no longer recognized by the server. I ran a scan on it using Windows chkdsk, which ...
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21 views

Disable VGA port via GRUB in Linux

I want to disable VGA port of my hardware by making changes in the GRUB. How can I do this? I am using Red Hat.
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12 views

Maintain 32 and 64 bits version of rpm

let me explain this a little bit, I am in charge of update part of our company product from 32 to 64 bits. At the end, we should have a 64bits kernel + 32bits applications + some 64bits ...
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40 views

Tomcat 7 not producing log output to catalina.out on RHEL7

I have a RHEL7 server with Apache Tomcat 7.0 installed and after a recent update to RHEL7.1 all of the logging to ${catalina.base}/logs/catalina.out was stopped. However i am receiving the logs inside ...
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19 views

What are the steps to migrate from GRUB to GRUB2?

I have a fresh installation of Scientific Linux6/RHEL6/CentOS6: I have /boot with boot loader and / with all else (which are sda1 and sda2 partitions of one hard drive, on a fresh, real system). I ...
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16 views

Upgrade python from 2.4 to 2.6 on RHEL 5.7

Currently We have 2.4.3-56.el5 version of python installed on RHEL 5.7. Need to install nodejs for which the python version should be upgraded to python26. I have downloaded the below rpms: ...
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18 views

check status of network printer in linux

I need to enable/disable print button in my application based on status of available printers. For USB drivers, I am checking sysfs ( /sys/class/usbmisc/lp0/dev ). But for Network drivers I didn't ...
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25 views

Internet connection proflem on CentOS and Redhat linux

I am new on CentOS and installed dual boot with windows 7. I am using a local isp internet on my windows7 system but can't access through centos. On centOS system, using the same IP, DNS, and Server ...
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19 views

LDAP replication issues (duplication)

I initially thought this question might be more appropriate for SO, however as I believe it's more of a configuration problem I have posted it here. I'm running LDAP 2.4 on RHEL 6.4. I have 2 LDAP ...
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23 views

How can I confirm download status for yum update on RHEL5/CentOS5?

I have an older server/appliance running CentOS 5.x. When I run updates on it, yum shows something like this: The screen stays like that until all packages are downloaded -- no status or progress ...
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17 views

RHEL: add IPv6 default gateway via interface configuration file

I need to configure a default gateway for IPv6 over the interface configuration files in RHEL (6.6). The File is managed by puppet With IPv4 there is this option GATEWAY=[IPv4 address] I've ...
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32 views

Jboss startup ownership issue

Facing few issues with jboss startup . After jboss startup , permission of few files got changed because of which we had to manually change the files and start jboss . $ ls -l /etc/init.d/online ...
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38 views

How to mount cgroups controllers using cgconfig.conf, while systemd running

I am trying to create a basic cgroups setup on a few Fedora 20 servers (using cgconfig and cgred services). The problem is I would like to create a hierarchy with access to several ...
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18 views

Incorrect keyboard mappings on RHEL v6.4

Spent a while trying to create keyboard shortcuts in terminal for command history access (up/down arrow keys). Realized after some frustration that this wasn't the issue - some keyboard keys are just ...
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25 views

up2date login & patch APIs for RHEL7

I am trying to achieve controlled patching of the RHEL machines in my network, for which I need to get the patch binaries downloaded onto a windows machine. I have already familiazired myself with ...
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9 views

HP laserjet CP1025 printer not working in RHEL 6.0

I have installed HP laserjet CP1025 on my RHEL 6.0 system . Its discoverable but I am not able to take a print from it. There are no errors or warnings displayed. I have installed its driver by ...
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10 views

Advanced-N 6205 wireless module problem in T430 notebooks

After upgrading a RHEL 6.6 (it was already on 6.6) the built-in wifi card couldn't see any wireless networks, the kernel module couldn't load and this was in the /var/log/messages Jul 2 10:21:47 ...
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22 views

How to update my local repo that i am using to serve local machines?

I have created a local repo with 618 packages and made it available for my local servers.So that they dont fetch updates directly from RHEL repo. Here are some info about my local repo: ...
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61 views

Implications creating System Accounts “useradd -r” Linux Fedora/RHEL/CentOS

I want to know what are the implications of create an account using -r option? # useradd -r ... The help says: -r, --system Create a system account. System users will be created with no aging ...
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39 views

Have kickstart install TCPdump

I have a kickstart file for RHEL 6 and in the package section for the installing of the TCPdump command line utility I put tcpdump as the package name. Like I did with java and g++ in the kickstart ...
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85 views

python install on linux RHEL5 - GCC 4.1.2-52

I used the following guide from the Beyond Linux From Scratch SVN Book, not knowing that my distribution was actually RPM Based (see comments), and now I am getting the following error during python ...
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21 views

not Booting a newly linux kernel inux-2.6.32.65.tar problem

when i give reboot command kernel not booting screen showing.. i uploaded this pic here , and caps lock key blanking
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91 views

rgmanager [fs] start_filesystem: Could not match “f6a58cf7-b39b-489c-add5-444ceab8af9d” with a real device

I am trying to install two node cluster for web server. We have super mico hardware HA BOX. It has 5 disk. one disk is used for node1 os installation and another disk is for node2 OS. Remaining disk ...
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138 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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35 views

Linux (RHEL) installed on Windows Hyper-V supporting Virtual HBA

I have installed RHEL 6 on Hyper-V as a Guest machine. I have added Virtual Fibre Channel. But I cannot detect in the RHEL. I also don't know how to find it is working or not. Can anyone help me ...
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581 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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184 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 ...
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43 views

kickstart does not chmod a file in %post section

I have the following code executed in the %post section of a kickstart file for RHEL 6.6. echo '#!/bin/sh' > /root/add_user echo 'if [ $# -lt 1 ]; then echo "no username provided"; exit 1; fi' ...
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179 views

upgrade glibc to 2.7 in Redhat 5

Is it a bad idea to upgrade glibc to 2.7 in Redhat linux? if yes, why is that?
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32 views

Repo Management

I've been mirroring RedHat repos locally to maintain consistency among our infrastructure servers using the instructions located at: https://access.redhat.com/solutions/23016 My question is though, ...
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249 views

STDERR: yum-dump Repository Error: Cannot retrieve repository metadata (repomd.xml) for repository: epel. Please verify its path and try again

This have been a chronic issue with my servers. i use epel repo to install & upgrade nss package. But every frequently, i have this issue where it fails with the error. STDERR: yum-dump ...