Red Hat Enterprise Linux version 6 is a Linux distribution sold by Red Hat, Inc. for the enterprise market. It is used for both servers and desktops. Although the binaries are not freely available, the sources are, and so there are numerous projects which provide compatible rebuilds of RHEL, such as ...

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Docker 1.6.0 on RHEL 6.5 with SELinux, can't run containers without root

I'm trying to run a container on a RHEL 6.5 but I keep hitting this problem: sudo docker run -u postgres -it registry/postgres /bin/bash /bin/bash: error while loading shared libraries: ...
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0answers
4 views

RHEL Cluster Failover doesnt write to syslog

I'm not a system administrator, so apologies if the questions seem basic or if any details are missing. We have 2 servers running on RHEL6. We have a single instance of a Java application running on ...
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0answers
12 views

While executing vgdisplay command on RHEL 6.5 gives me Input/output error for disk. But the server doesn't have that disks

Complete errors as given below: /dev/mapper/mpathcq: read failed after 0 of 4096 at 107374116864: Input/output error /dev/mapper/mpathcq: read failed after 0 of 4096 at 107374174208: Input/output ...
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vote
2answers
63 views

Low CPU and Memory utilization. Does that mean server is healthy?

On a fairly busy RHEL6 server I keep noticing on average following indications CPU Usage : 2%. CPU Load AVG: 0.4,0.2,0.1 Memory Usage: 1.3 out of 16 GB This is the CPU this server has Intel(R) ...
3
votes
5answers
2k views

Server freezes while installing Redhat Enterprise Linux Server 6

We've tried both the first options Install or upgrade an existing system Install system with basic video driver When trying option #1, it gets to a screen that has a solid cursor about halfway ...
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1answer
943 views

partprobe will not work..i have tried everything

I am days before the RHCSA exam and i have noticed i still haven't been able to successfully run partprobe successfully after months on testing and testing and testing..not a single time I have tried ...
2
votes
0answers
61 views

apache Access Control TROUBLE [on hold]

I'm studying Apache in my rhel 6.5 home lab # cat /etc/redhat-release Red Hat Enterprise Linux Server release 6.5 (Santiago) # rpm -qa | grep httpd httpd-tools-2.2.15-29.el6_4.x86_64 ...
4
votes
2answers
5k views

Generating an SHA256 SSL CSR on CentOS/RHEL using genkey

The officially recommended method of generating a web server SSL certificate CSR (according to RHEL6 and CentOS 6 documentation) is to use the genkey utility. When used according to the docs, this ...
2
votes
4answers
3k views

Nagios NRPE: Command “my_command” not defined

I have installed Nagios® Core™ 3.5.1 and NRPE v2.14 on my client which running RHEL 6.3 I have this error message on my Nagios NRPE: Command 'check_mysql_connections' not defined On my nrpe.cfg I ...
0
votes
1answer
26 views

How to migrate from ide to virtio in RHEL 6.5 KVM guest with LVMs

I want to migrate a IDE-using, LVM-based KVM guest running RHEL 6.5. I found this steps in this page: 1) Run virsh edit . From there, edit the config file and adjust all lines of <target ...
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vote
1answer
991 views

JBoss EAP 6.2 on RHEL 6: ./bin/init.d/jboss-as-standalone.sh hangs while calling via SSH

I'm using jboss-as-standalone.sh to manage JBoss EAP standalone as a service. I can start/stop the service with "service jboss-as-standalone.sh start/stop" while I'm on a terminal. But I would like ...
1
vote
1answer
3k views

RHEL hangs after starting virt-who succesfully

Idea #1: Is there a way to REPAIR an RHEL 6.2 installation? During the start-up procedure, after a recent forced reboot, my Linux machine (RHEL 6.2) hangs right after successfully starting ...
1
vote
1answer
838 views

HTTP Request Header limit hard coded in Apache 2.2

I looked up some other question concerning this on SF, they revolved around a maximum limit being set for LimitRequestFieldSize and LimitRequestLine at 8K. httpd's documentation confirms the limit, ...
3
votes
5answers
1k views

Reloading a kernel “live” in CentOS / RHEL 6

When upgrading the kernel package on CentOS or RHEL 6, is it possible to load the new kernel without rebooting? My gut tells me it's not, but if it were, it'd be handy - especially when compiling ...
3
votes
5answers
5k views

RHEL 6.x - yum gives “ImportError: No module named cElementTree” errors

I'm making a set of changes to a group of 150 servers. All systems were able to successfully download and install a specific set of RPM's via yum, except for one. One this particular system, all yum ...
2
votes
0answers
12 views

How do I install Firefox with preconfigured toolbars? [migrated]

I have a custom Red Hat 6 kickstart disc which installs and configures a workstation as a control system. We use Firefox (at the moment: the 31.4.0 long-term release) to allow the system maintainer ...
0
votes
1answer
46 views

bash script doesn't run properly in crontab but runs fine manually

I wrote a small script to determine the average IOPs per hour in which I later manually convert to a graph and spreadsheet for management to discuss a potential SAN upgrade for an upcoming expansion ...
2
votes
3answers
2k views

How can I get the git-all meta package on RHEL 6.2

I believe I'm missing some of the common git addons, such as gitk, and I suspect it is because I installed git using sudo yum install git as the information for that package lists: : The ...
0
votes
1answer
2k 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 ...
1
vote
2answers
536 views

Hotplug area too small error

I have VM running under RHEL6, which is running under HyperV. It has a lot of important soft installed, but does not have suffocating workload (~10% CPU is used). It's been really unstable recently ...
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votes
0answers
21 views

policy based routing on multiple interfaces and default route

I have a server with multiple interfaces connected to different networks. I have eth2 wih ip (10.1.1.1). I have the following routing set: # ip rule list 0: from all lookup local 32765: ...
0
votes
1answer
3k views

ptp time synchronization on centos6/rhel

I need to setup time synchronization using PTP (precision time protocol). I'll get server address. I found ptpd server (version 2.1). I created startup files in /etc/init.d. But wondering what options ...
0
votes
2answers
1k views

Unable to load dynamic library '/usr/lib64/php/modules/ssh2.so' [closed]

When I try to run any php script with my user within shell, I get the following warning: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/ssh2.so' - ...
5
votes
3answers
5k views

Interpreting cryptic kernel “page allocation failure” messages

I have a multi-user CentOS 6.1 database system running an application named ABC. The server is 64-bit, 8GB RAM and 6 vCPU (on VMWare ESXi 4). We get frequent dumps into the dmesg and the system logs ...
68
votes
5answers
128k views

What version of RHEL am I using?

From the shell and without root privileges, how can I determine what Red Hat Enterprise Linux version I'm running? Ideally, I'd like to get both the major and minor release version, for example RHEL ...
5
votes
2answers
461 views

CentOS 6 in production

All of my virtual servers are on Centos 5.5. Now I am deploying new one and there is a new OS option: CentOS 6. I like new software, and I prefer to use new versions (but not the edge). So, as far as ...
3
votes
3answers
2k views

RHEL 6.3 Upgrading OpenSSH & Apache

We just ran an external security scan from 403Labs against one of our servers (RHEL 6.3 x86_64) for PCI compliance and the results appeared to mainly dictate that we had a hand full of applications ...
8
votes
1answer
6k views

“power limit notification” clobbering on 12G Dell servers with RHEL6

Server: Poweredge r620 OS: RHEL 6.4 Kernel: 2.6.32-358.18.1.el6.x86_64 I'm experiencing application alarms in my production environment. Critical CPU hungry processes are being starved of resources ...
0
votes
0answers
37 views

ls hangs on NAS mount point

Frequently we are running into this problem. our NAS mount points works perfectly and all of sudden it hangs. when we go and do ls hangs the terminal. strace ls /srv/git hangs here ...
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vote
1answer
62 views

Linux VMWare Tools build for running kernel or latest installed kernel?

I haven't been able to find any information regarding when building VMWare Tools on Linux whether it builds against the currently running kernel or the latest installed kernel. To clarify ...
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votes
1answer
30 views

Installing a Newer Package than what's in RHEL's Repositories

What's the best way in RHEL to install a newer version of a package than what's in the repositories? In Ubuntu I can just add the repo for a newer version of Ubuntu, install the package with apt, ...
4
votes
1answer
5k views

How to upgrade module located inside initramfs?

We have recently upgraded our e1000e (intel ethernet) module on one of our CentOS 6.0 boxes. Even tho the module compile and installed fine, the old version is still being used. We have tracked this ...
-7
votes
1answer
59 views

How to install git-daemon on red hat enterprise 6 [closed]

I need to install git-daemon on Red Hat enterprise Linux 6.2, with http support. What are the correct package to install? It is necessary to create a specific user or group? I'm looking for a simple ...
0
votes
1answer
47 views

add system user without login but able to su without asking for password

I created a user "sysuser" with -r option, when trying to su using another non-root user I am prompted for password. As "sysuser" is a system account and should not login, I did not set up a ...
1
vote
1answer
32 views

Log/Audit everything allowed by SELinux

I'm profiling some proprietary software to construct a set of permission requirements and SELinux policies to allow it to install and run on Oracle Linux (or any RHEL derivative). I'm running SELinux ...
3
votes
1answer
2k views

Account Lockout with pam_faillock in RHEL6

Previously, I asked about using pam_tally2 under RHEL6. I would like to pose this question and answer to document the recommended use of pam_faillock over pam_tally2 for the same function; What is ...
1
vote
1answer
64 views

Check if account is allowed when using pam_access

I'm using pam_access and /etc/security/access.conf to restrict who can login to my Rhel 6.5 hosts. I have an LDAP server with a diverse user base, and the security people would like a list of who can ...
4
votes
2answers
2k views

Why is Linux kdump not writing to /var/crash?

It's happened again! I have 4 servers which are crashing periodically, and there is no information printed to the system logs or the serial console. In addition, the Linux kdump service isn't writing ...
0
votes
1answer
712 views

pam_tally2 being called before Password entry

Based on the suggestion given in: Account Lockout with pam_tally2 in RHEL6 I have come to a working configuration, wherein account is getting locked out after 3 failed logins. Catch is that ...
0
votes
0answers
28 views

Running a DRBD cluster having two different versions

Is it safe to have a cluster composed of two servers one running DRBD 8.0 one running DRBD 8.3 or 8.4 Currently there is only one DRBD server with the 8.0 data. Will the new added server on DRBD ...
1
vote
0answers
45 views

NUMA - all CPU's bound to node 0

I am running Dell PE 815 servers with two 16-core Opteron's, with four memory modules on each, OS - RHEL6, when I've started optimizing it for NUMA operation, found, that all cores are shown as bound ...
0
votes
0answers
82 views

AWS Linux RHEL instance unable to format and load new storage partition

I have an AWS RHEL instance. Following are the storage devices on it: $lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT xvda 202:0 0 20G 0 disk xvda1 202:1 0 6G 0 part / I ...
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votes
0answers
32 views

Apache doesnt start after mod_wsgi re compile

I recently had to rebuild python and mod_wsgi in order to get a django site working. The problem is now apache doesnt start. I'm running RHEL6, and Apache 2.2 This guide is what I followed ...
3
votes
1answer
373 views

Cron job as root need to sudo to another user [duplicate]

RHEL6 In root's crontab a have: * 21 * * * /root/script.sh In script.sh there is a line: /usr/bin/sudo -u jira bash -c 'cd /opt/jira/bin; ./stop-jira.sh' && echo "Jira Shut Down" >> ...
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votes
0answers
53 views

What causes ntpq refid CRYP when authentication is successful?

I have five servers that I'm configuring for production use based on a configuration we've recently tested. The servers are RHEL6 with NTP version 4.2.4p8@1.1612-o. Right now, though, I'm trying to ...
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vote
1answer
175 views

How do I get the system-serial-number for Xen Server?

I would like to find out how could I be able to retrieve the system-serial-number of virtual machines installed on Citrix XenServer. I had referred to ...
6
votes
2answers
12k views

Account Lockout with pam_tally2 in RHEL6

I am using pam_tally2 to lockout accounts after 3 failed logins per policy, however, the connecting user does not receive the error indicating pam_tally2's action. (Via SSH.) I expect to see on the ...
0
votes
1answer
48 views

RHEL6 autofs maps with subdirectories and LDAP

All the documentation I see shows, even for file based, mounts that will show up on the client computer like /test/mymount and you can have as many /test/mymount2 /test/mymountN as you want. What I ...
0
votes
1answer
1k views

Moving from nslcd to sssd on Red Hat to solve NSS MD5 issue

I have a problem with the latest version of Red Hat, nss/nscd does not accept MD5 certificates. Because of recommendations I am replacing nscd with sssd with this howto ...
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vote
1answer
678 views

Rsyslog unix timestamps on RHEL6

I'm trying to get rsyslog on RHEL 6 to render the time the message was logged at as a unix timestamp. I started by read the documentation at http://www.rsyslog.com/doc/property_replacer.html. Since ...