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

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RHEL 5 Booting from Local Hardisk & SAN Harddisk via grub

I had a RHEL machine booting from local disk. Later I removed local disk & booted from a SAN disk and installed RHEL on it. Now I have read about a grub.conf file: root (hd0,0) kernel ...
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Garbage hex bytes in wtmp file

I have been trying to extract the boot and login history for a test PC running RHEL 5.8 with some kernel updates. I started by using last -f /var/log/wtmp, and noticed some strange results. Further ...
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Add multiple workgroups in Samba

I am using RHEL 6.5 and I have integrated this server with Active Directory using this guide. As of now, I have configured only one domain in /etc/samba/smb.conf, so that only the users belonging to ...
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30 views

How do I boot my computer from a Live-DVD from the terminal?

I'm not an expert on computers in general or Linux in particular, so if I'm vague on something please let me know and I'll try to elaborate. I have an old computer running Red Hat 5.0. It had a ...
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184 views

RedHat init.d script will not start with service after stop

I have the service script below, which calls a shell script. We changed something in the script When I run the shell script directly, everything works fine. When I restart the servER, everything works ...
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55 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 ...
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659 views

RHEL 6.6: [Errno 14] PYCURL ERROR 22 - “The requested URL returned error: 403 Forbidden”

First of all, it's the first time I setup RHEL machines, I’m more used to Debian. We're installing many machine at the same time. We've upgraded from RHEL 6.3 to RHEL 6.6 and we're now trying to ...
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504 views

Mounting NFS via systemd in Centos 7

I am trying to mount an NFS share on a CentOS 7 box using systemd. This is my /etc/fstab entry: 10.0.0.104:/export /mnt nfs ...
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60 views

Learning differences between Fedora and Redhat [closed]

Background: I have a fairly decent background in linux and am currently using Arch as my primary OS. However, I am going to start working at a new job that requires using and administrating Redhat ...
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848 views

CentOS 7 boots too fast and network is not ready when executing cron scripts

I have just upgraded from CentOS 6.5 to 7.0 and I am not too happy as the new systemd is probably giving me problems. It seems it is just simply booting too fast, starting up processes asynchronously ...
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116 views

Yum not working at all

I ran the command yum clean metadata and then ran the command yum update. When I ran the yum update I now get the following errors Loaded plugins: product-id, security, subscription-manager This ...
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813 views

RHEL 7: mount windows cifs share failed

It may look like it is duplicate question but in context of RHEL 7, it is not. As RHEL 7 does not have mount.cifs binary present in /sbin, I want to know what else can be done to mount windows cifs ...
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62 views

Simulate Initial Login of user without using sudo

I'm writing a script to interface 2 third-party programs. (Datadog and AWS) The data mining script uses sudo -u to run my script. The script that I need to retrieve data from will segfault if ...
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1answer
36 views

talk to modbus device

I currently have a minimal install of Red Hat 6.5 running, on the machine I need to talk to a modbus device. I am wondering what tools and drivers are needed on a linux machine to talk to a modbus ...
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137 views

File of Doom freezes any computer that attempts interaction

I have a file on an internal server that causes any machine that interacts with it to immediately and irrecoverably freeze. By interaction, I mean just about anything: rm, mv, cp, cat, vi, gedit, ...
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282 views

How to remote install CentOS/RHEL 7 using a rescue image like GRML?

Assuming a remote machine where you can PXE boot into a GRML image that also provides ssh access. Now the question is how to install CentOS in such an environment. Something like KVM access is not ...
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37 views

Sudo requiring password

On a RHEL server I would like to let a user run a command as root without a password: # uname -a Linux foo.com 2.6.32-220.38.1.el6.x86_64 #1 SMP Wed May 15 08:34:56 EDT 2013 x86_64 x86_64 x86_64 ...
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3k views

Nslookup: command not found error on RHEL/CentOS 7

During linux installation I selected "minimal" option: When I went to run the nslookup command to look up an IP address I got the error message nslookup: command not found as shown in the example ...
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105 views

Start/stop service script like Ubuntu for RedHat

Is there a .sh script that manages starting and stopping the service like Debian/Ubuntu but for Red Hat/Fedora? Looking to place it into the file running some software.
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How to globally configure secure clients using OpenSSL on Oracle Linux 5/RHEL 5?

My workplace recently patched one of our servers to address the POODLE vulnerability. Since then older Oracle Linux 5 clients (based on RHEL 5) can no longer securely connect to the server with any ...
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29 views

Generating Email alert for events in system log

How to generate email alert for every critical event logged in system log /var/log/messages. Suppose, for the following log message, I want an email alert to be generated. Oct 24 11:17:42 eforms ...
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18 views

RAID1 not working on 4K Sector Size

I have created a RAID1 configuration with two internal Fusion-io SSDs. When I formatted the cards to a sector size of 4K, Linux kernel will generate hourly errors stating one of the device has failed. ...
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37 views

Software packaging for RedHat similar to Ubuntu

I'm currently helping a professor who is having trouble installing a particular software onto the school's server which runs on Red Hat/Fedora. The professor thinks that the software was packaged for ...
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56 views

KDE-Openbox closes immediately after it opens on Cygwin

I just installed Cygwin a few days ago. Now when I want to explore it, I can't run KDE-Openbox. I haven't tried anything else, except compiling Mplayer which did work. Last time I had Cygwin ...
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57 views

Why are --older-than and --younger-than killall options missing in RHEL/CentOS?

I've experienced this issue in cleaning up scripts written by developer who were writing for Ubuntu systems, as well as ServerFault questions like this. Is there any reason the -o, -y (--older-than ...
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94 views

RPM command stuck/FREEZE when installing RPM file

I want to install the following rpm from some reason RPM is stuck or freeze and not install the RPM package also I cant stop it by control C , please advice what could be the problem ? root]# rpm ...
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42 views

After added SLC6-OS repo to RHEL6, should I let it update 1200+ packages (400M)

I have RHEL6.4, and have added several repos to it to try and add some common tools, gcc for example. It was recommended I add SLC6-OS and use that for installing tools like gcc, but when I do: ...
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What means “removing packages from package profile” in up2date in RHEL?

What does "... removing packages from package profile: ['package1', 'package2']" mean in RHEL, in the /var/log/up2date log? I thought it was dependencies, but the software is still present.
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Shell script to monitor log files going over a certain size [duplicate]

Due to another issue I'm tracking down, one of my app servers occasionally starts generating a large amount of errors and then becomes unresponsive. For now, the simple solution is to restart the ...
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1answer
559 views

What is the purpose of avahi on a RHEL 7 server?

Running a server machine with CentOS 7, I've noticed that the avahi service is running by default. I am kind of wondering what the purpose of it is. One thing it seems to do (in my environment) is ...
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195 views

Can't install any packages on RHEL because of dependancies

Trying to install packages, and keep getting dependency errors. Already installed EPEL, IUS, REMI repos. Example: yum install gcc and I get Error: Package: ...
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92 views

Unable to Configure Quotas in RHEL6 & CentOS6- quotecheck returns error message

Unable to Configure Quotas in RHEL6 & CentOS6- quotecheck returns error message I've created new partition(/dev/sda6) and mounted it(on /hulk). Edited /etc/fstab file to give quotas on the ...
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messed up repos in RHEL6

I have RHEL 6 and have installed a bunch of the common repos (epel, etc) and somehow screwed up the repos (I think with a repo clean command) I was getting errors specifically with EPEL, so I removed ...
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44 views

Latest libxml2 port to RHEL4

I am currently installing ModSecurity on our development servers and the problem that I am running into with the latest version is that we are utilizing RHEL 4 on our servers. They have no intention ...
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192 views

Rebuilding the Linux yum repository metadata

On a RH 6.5, running yum update I get : "This system is receiving updates from RHN Classic or RHN Satellite. Setting up Upgrade Process Error: Cannot retrieve repository metadata (repomd.xml) ...
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151 views

Using autofs to mount a NFS share

I am trying to setup a RHEL 7 machine with an autofs NFS mount (the NFS mount is a Windows 2012 R2 server running Services for NFS). Here are the contents of /etc/auto.master: /nfs /etc/auto.nfs ...
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1k views

How to make NIC team come up on boot in RHEL 7

To configure networking on RHEL 7, I created a JSON file for teaming, then ran these commands: ip link set down eno1 ip link set down eno2 ip link set down eno3 ip link set down eno4 teamd -g -f ...
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1answer
59 views

Setting up 3rd party sftp server to run on port 22

I'm trying to setup CrushFTP 7 on a RHEL 6.5 machine and am having issues. If I leave everything as default I can connect using port 2222 but I need to be able to have CrushFTP respond to requests on ...
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Why does RHEL offer updates for hardware I don't have?

RHEL 7 offers me to install 150+ updates, and it seems most part of these updates are not applicable to my server. For example it offers to install some "WiFi" Firmware, but my server doesn't have any ...
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13 views

Veritus volume manager perl not avaliable

I am trying to install veritas volume manager on Centos 6.5 while running the script its throwing me Cannot find perl to execute
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How to configure teaming in RHEL 7?

I've used RedHat documentation to configure LACP on my server. Now I see "Connecting" on the Team just created: why "team0" is mentioned twice in the list? Why is it "Connecting", not "Connected? ...
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77 views

Configure cron for daily NMon task

I want to configure a cron job for NMon to gather stats during all day, everyday. Leaving a file per day to dump into NMon Analyser. I know the proper command to get a spreadsheet format its ...
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84 views

How to keep the VNC service running after reboot (RHEL 6)?

I have installed the vncserver related package and am able to access the desktop through the client. But on restarting the Linux machine, I am loosing the VNC session and again I am supposed to run ...
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207 views

RHEL 7 - how to configure teaming on internet-less server?

I'm preparing to install RHEL 7 on my server. I read in doc that The networking teaming daemon, teamd, is not installed by default. To install teamd, issue the following command as root: yum install ...
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103 views

Reboot Redhat Enterprise Linux

How can I reboot the RHEL from CLI using the systemctl method?
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381 views

ssh public key authentication not working

I had my keys set up so I can ssh between machines without having to enter a password and everything was working for a while but then, all of a sudden, I'm being prompted for a password on some ...
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111 views

Change login user account when accessing server through Putty

I am a very new systems administrator. I have been hired in as a junior and came from a Windows administration back ground. I have about one month of Linux experience. I have a lot of resources that ...
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RHEL 6.1 yum hangs on “Updating Red Hat repositories.”

I just registered my RHEL 6.1 system using rhn_register. However, when I try to run any "yum" command, it gets stuck on "Updating Red Hat repositories" and never does anything. BTW I can run this ...
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How are network and SCSI kernel modules handled differently from other kernel modules?

I used modprobe to load the 8021q.ko module on a server. I expected to have to do this every time the server rebooted until I made it persistent. However, to my surprise, it was loaded automatically ...
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cd to a child directory of a symlink fails

To build a kernel module, you have to do make -C where -C is cd functionality. As my make failed a lot of times, I found this: [root@ror6ax2 modules]# ls -l /lib/modules/`uname -r` | grep build ...