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

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'ss' command for checking sockets not found

I get an error when I try to execute this command on Red Hat Linux. $ ss -s -bash: ss: command not found It is supposed to be for checking socket statistics. How do I execute this?
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265 views

Redhat Grub not working after Fresh Install

Today i installed redhat on one server this server will be used on DR site as a backup. System has 2 HDD with 500GB space and I created the RAID0 and after that i completed the installation. But ...
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4answers
6k views

kswapd0 takes 99% to 100% CPU in RHEL 6.3

I have 5 systems on which I have just installed RHEL6. System configuration is CPU-i7 HDD-500 GB RAM-2 GB Swap- 4 GB I have installed the same software's and all the configuration as per ...
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4answers
23k views

Why SSH takes a long time to Connect

I have noticed that some Linux Servers in Network takes long time to connect using ssh. Situations: There are two situations I have faced: On some servers some times it takes a long time to ask ...
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4answers
7k views

What's the difference between a hard links and copied files?

My understanding is that hard links include a copy of the original file and that I could delete a hard-linked file in one directory, and it would still exist in the other directory. If that's the ...
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4answers
295 views

Why would someone want to change the last access date of a file without making actual changes within the file itself?

CentOS 6 I'm studying RHEL / Centos and recently learned that the touch command can be used to change the last access date of a file. I'm struggling to understand a practical reason why anyone would ...
4
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1answer
12k views

How to Format an LVM partition

I need to format a partition. But I have one LVM on my machine (VirtualBox) that is composed of two different two partitions of two Virtual HDD's (sdb5 and sdc5) fdisk output df output
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1answer
114 views

Peculiar lack of RHEL 5.8 service management documentation [closed]

I am needing to see the status of some services on some of our RHEL 5.8 hosts on which I am not an admin. Much to my surprise, I am not able to get any info how to do it (such as chkconfig or ...
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2answers
813 views

.exrc file in home dir not effective

I made a simple .exrc vim config file in my home directory on RHEL 5.8. Here are the contents: set nu However, when I go into vim, the line number are not shown. It may be worth noting that I am ...
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2answers
4k views

Ignoring dependencies when installing with yum (Scientific Linux)

How can I ignore dependencies of a single package I am attempting to install using yum in Scientific Linux? The answer would presumably the same for CentOS/RHEL. To elaborate, I am looking to get the ...
2
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1answer
97 views

Message appears after every command completed

I am very new to Linux. Having said this, I had a friend go on my RHEL machine and he somehow added a few random lines in a file, which will post every time I have completed a command. I am not sure ...
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77 views

RedHat server packages are never found

I set up a virtual server Red Hat machine but every time I try to use the "yum" command to install new packages, the command works properly but it is never been able to find any package even the ...
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1answer
2k views

RHEL Installation issue with UEFI on HP Compaq Desktop

I have bought a new Desktop HP Compaq Elite 8300 SFF. It came with Windows 7 Pro installed. Now I want to install Linux (RHEL) by dual booting it. I have successfully shrinked the partition and ...
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3answers
4k views

Is Red Hat Linux licensed

Am confused so thought of asking a question. According to this Red Hat Becomes Open Source’s First $1 Billion Baby, it is opensourced so my question is: Where can I download the Opensource version ...
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4answers
2k views

How to copy Big files on other Linux Server Independent of TTY

Actually i was trying to copy all the files in another director. Total size of the file is 188GB so its going to take a time. Im trying to copy for Linux server A to B using this command nohup scp ...
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2answers
15k views

Difference between >> and >\> operators?

RHEL 6 Is there a difference between the >> and >\> operators? I read the following blurb in a RHEL training book: "You can add standard output to the end of an existing file with a ...
2
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0answers
471 views

Run a command before services are started

I have a Oracle Linux 6.3 system on which I would like to run a command when the machines starts up before any other services are started. The reason for this is to try and work around a bug in RHEL ...
13
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4answers
7k views

Changing the timestamp of a symlink

I know how to change the timestamp of a regular file: touch -t 201301291810 myfile.txt I was not able to do the same with a symlink. Is it possible? Distro: RHEL 5.8
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0answers
195 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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1answer
232 views

Sequence of errors leads to init failure and subsequent kernel panic

We have one Redhat test server installed on Vmware ESXI. And when I boot the server it gave this error. How to solve this issue because due to this error it doesn't boot.
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3answers
5k views

What would be the RHEL package corresponding to build-essential in Ubuntu?

I know how to list available packages from the repos and so on, but how can I find a list that matches up equivalent meta-packages, such as the build-essential. Is there such a thing and if not what ...
15
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3answers
16k views

how to run new software without updating GLIBC?

I installed Mathematica 9 on an old Red Hat Enterprise Linux AS release 4 system. After the installation, I tried to start Mathematica, but following message came out: ...
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2answers
1k views

Upgrade zsh on red hat 5 x86_64

My machine is running RHEL 5 x86_64 I'm facing a problem with oh-my-zsh The zsh version on my machine is zsh --version zsh 4.2.6 (x86_64-redhat-linux-gnu) There are no upgrades available via yum. ...
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1answer
279 views

What is the 'pam-panel-icon' window?

After starting GNOME desktop, a window titled 'pam-panel-icon' appears, initially displayed in the upper-left of the desktop sized as small as possible. It can be resized, minimized, or maximized, ...
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2answers
9k views

Which of these three commands is telling the TRUE Redhat release information

I was checking for the Redhat release so this time I used three different commands. Two commands gave the same result but the third command gave different result. Which one is right. ...
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1answer
12k views

What is the easiest way to install Meld on RedHat Linux RHEL 5.4?

My company has RedHat RHEL 5.4 on the Linux box, and I need to install Meld on it. How can it be done? $ sudo yum install meld No package meld available. Nothing to do $ sudo yum search meld No ...
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1answer
3k views

Why does Red Hat Linux use such an old kernel?

Why does RHEL (and its derivatives) use such an old kernel? It uses 2.6.32-xxx, which seems old to me. How do they support newer hardware with that kernel? As far as I know these kind of distributions ...
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1answer
3k views

How to stop users from Switching to Root user

I have disabled the root user login from Sshd.conf file so now no one can login using root user even if they know the password SOMEHOW. Now I have 3 users in server ROOT,EMERG and ORACLE. I want to ...
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1answer
323 views

Mirror RHEL repositories

I'm attempting to install Spacewalk 1.8 with mrepo and create a mirror of RHEL 5&6 packages to use for frequently spun up development VMs. There are several guides that indicate I should use ...
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6k views

How to mount Windows shared folder on Redhat

Case:: I have to mount the windows shared folder on redhat directory /mnt or anywhere elese. This is the Windows shared folder Path D:\Analytics\Data\DownLoad This path will be mounted on Redhat so ...
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2answers
234 views

Upgrading the kernel in Redhat Linux 6.0

How do you upgrade the kernel in Redhat Linux 6.0? And how can I confirm whether it is updated or not?
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2answers
18k views

Does iptables -F permanently delete all iptables rules?

In a RHEL training document, the author says: ...run the following command to disable the firewall on the current system: iptables -F He explicitly uses the word "disable" which to me suggests ...
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2answers
163 views

Why would I want to create more partitions if RHEL will only recognize up to 16?

During some basic RHEL training, I came across this blurb: Although it's possible to create more, RHEL will recognize only up to 16 partitions on any individual SATA, SCSI, PATA, or virtual hard ...
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0answers
699 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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1answer
2k views

Server inbound email forwarding

I have been struggling to get this to work for a little while now so I have come in the hope of getting a wee bit of help. I am running redhat 6.3, and using the machine as a webserver. My question ...
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1answer
754 views

Cannot edit crontab

I'm running RHEL 5.6. I type $ crontab -e and all I see is Killed I am, however, able to edit a file (let's say I call it crontab.in) and then type $ crontab crontab.in $ crontab -l and see ...
2
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1answer
242 views

RHEL6 not registering correctly when using PXE boot via Cobbler

When I create a RHEL6 server using the DVD media, it works fine. However, we want to do PXE installs. We import the RHEL6 DVD to cobbler by doing the following: $ sudo mount -o loop,ro rhel6-dvd.iso ...
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4answers
19k views

Why VNC not showing actual Remote Desktop

Ok i installed vnc server on RHEL 5.9 and also installed Tightvnc viewer on windows 7 and from RHEL i started vncserver and assigned the password using vncpasswd. Then from tightvnc viewer i gave the ...
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2answers
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How to easily install Google Chrome and Firefox on RHEL 5.4 (RedHat)?

I heard that it should be not that hard to install Google Chrome and the latest Firefox on RHEL 5.4. (the OS our company support is only up to RHEL 5.4). It probably requires some make install and ...
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5answers
861 views

cron job schedule

I created a cron job using * */2 * * * schedule. Can anyone tell me what schedule this refers to? I guess it should execute every 2 hours, but it seems to execute every minute.
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4answers
5k views

How to verify if the Language is installed

Is there some command for Redhat Linux that can tell me whether the Arabic Language is installed on Redhat 5.6 Server.
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1answer
13k views

Public key not found for RPM

I am trying to install package on Redhat 5.5 using YUM but it always give me this error [root@redhat64 Desktop]# yum install perl-Net-Server-0.97-1.el5.rf.noarch.rpm Loaded plugins: rhnplugin, ...
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1answer
169 views

How to Update only important Security Packages in redhat 5.6

One of our client has Redhat 5.6 and he is asking to update only the important packages. But question is how do we know which are the important packages. Note:: It will be a partial Update not ...
2
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3answers
4k views

How to install Redhat using the iso image stored on Network

This is the case. I want to install the Redhat 5.6 on my system. But this time i dont want to use the actual DVD but this time i want to install it using the iso image stored on one of our server HDD. ...
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3answers
64 views

execute file in server more safely?

We have a application which takes a C++, C, or Java file as input, executes it, and displays the output to the client. What are the best measures that can be taken so that no security related issues ...
0
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1answer
96 views

Does RHEL 6 enforce software constraints on the number of SATA drvices that can exist on a system?

I came across the following blurb in some RHEL 6 training documentation: The number of drives that can be installed on modern computers has increased. With port multipliers, it's relatively easy ...
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3answers
6k views

Why is the theoretical RAM limit for RHEL 6 128 TB and how is this determined?

I'm studying for RHCSA and am confused by a statement I came across in some training material: There is no practical maximum RAM, as theoretically, you could run 128 TB of RAM on RHEL 6. But ...
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1answer
2k views

What is rsh.rlogin and How to remove rsh.rlogin

I never heard of this word rsh and also received a check list from Security pro that we have to disable rsh. Can someone please tell me what is this rsh and how to disable it. Base OS : RHEL 5.5 and ...
7
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1answer
8k views

autofs mounts not disconnecting after inactive

I have autofs installed on several linux servers that are connecting to central NFS server for the users /home directories. It works great when mounting the directories on login, but the mounts never ...
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1answer
1k views

What does m represents in VIRT column using TOP command

When we run top command it shows all the processes information. But under VIRT column there is m written against some values what does that m represents, is it MB . If yes then why it is only showing ...