Tag Archives: RHEL

Computers

Red Hat Enterprise Linux gets cozy with MongoDB

Leave a comment

Easing the path for organizations to launch big data-styled services, Red Hat has coupled the 10gen MongoDB data store to its new identity management package for the Red Hat Enterprise Linux (RHEL) distribution.

“The beauty of Identity Management is that it has a central infrastructure that companies can use to manage identities across many different types of applications,” said Kelly Stirman, 10gen director of product marketing. With MongoDB linked to Identity Management, those shops already using RHEL will find it much easier to set up and run applications that run on MongoDB data.

Although it already has been fairly easy to set up a copy of MongoDB on RHEL — by using Red Hat’s package installation tools — the new integration minimizes a lot of work of initializing new user and administrator accounts in the data store software.

Being connected to Red Hat Identity Management, MongoDB can use the user IDs and group permissions that are already managed within Identity Management, helping the organization to establish a SSO (single sign on) infrastructure for its employees and contractors.

To read this article in full or to leave a comment, please click here

…read more

Source: FULL ARTICLE at PCWorld

Linux

Joing Linux systems to AD and move to OU

Leave a comment

By snjksh

Hi,

We have joined Linux systems ( RHEL 6.3 ) to Windows AD ( 2008 R2 ).

System has been placed in the deafault location ‘Computers’ in AD. Then we manually move the systems to the respective OU.

Is there any option to specify OU location at the time of domain joining ?

We are using below command to join the systems.

# net ads join -U Administrator

…read more

Source: FULL ARTICLE at The UNIX and Linux Forums

Linux

How to Backup the Virtual Machine In RHEL 6.2?

Leave a comment

By babinlonston

Hi all ,

I’m using RHEL 6.2 , Installed centos and ubuntu in virtual machine , I have installed those virtual machines in a partitions such as /dev/sda5

Centos 6.2 installed in /dev/sda5
ubuntu 12.04 installed in /dev/sda6

how can i backup it and restore in any condition while if there is any need to restore .. Any one have idea please help me out ….

can its possible to Backup in command line and can i restore it ?
can i store it in / …

:rolleyes:

…read more

Source: FULL ARTICLE at The UNIX and Linux Forums

Linux

Info on commands

Leave a comment

By mystition

Hey Community!

I need to use the following commands in Solaris 5.10 machine:

xxd
sha256sum

I have them in my RHEL machine, but I am unable to find a package using which I can use them in my Solaris machine.

For xxd, i know it is a part of vim-common package.
Can anyone tell me the corresponding package name for Solaris 5.10. or share a download link. Also I need similar info for the command sha256sum.

Thanks in advance//

From: http://www.unix.com/solaris/221737-info-commands.html

Linux

Short Tip: Check configured virtual hosts in Apache

Leave a comment

Whenever you have to debug virtual host setups in Apache, checking the actual running virtual host configuration is a good first step. This can be done with the -S option used on the Apache binary: It lists all running virtual hosts and performs a syntax check.

On Fedora, RHEL, CentOS the Apache binary can be found on /usr/sbin/httpd:

# /usr/sbin/httpd -S
VirtualHost configuration:                                                        
1.2.3.4:80      me.example.net (/etc/httpd/conf.d/me.conf:5)
2.3.4.5:80      others.example.net (/etc/httpd/conf.d/others.conf:1)
2.3.4.5:443     others.example.net (/etc/httpd/conf.d/others.conf:38)
Syntax OK

On Debian systems the call is almost the same, you just have to source the environment variables upfront, and the binary has a different name for historical reasons:

# source /etc/apache2/envvars
# /usr/sbin/apache2 -S
VirtualHost configuration:                                                        
1.2.3.4:80      me.example.net (/etc/apache2/sites-enabled/me.conf:5)
2.3.4.5:80      others.example.net (/etc/apache2/sites-enabled/others.conf:1)
2.3.4.5:443     others.example.net (/etc/apache2/sites-enabled/others.conf:38)
Syntax OK

you might run into an error about user names, in such cases it is helpful to call upfront.

Filed under:

From: http://liquidat.wordpress.com/2013/04/17/short-tip-check-configured-virtual-hosts-in-apache/

Linux

Restart of services if port no is changed in /etc/services in RHEL

Leave a comment

By RHCE

I had a doubt if any services need to be restarted if port no in /etc/services in an RHEL setup is changed. For eg, the port no of 443 for SSL may need to be changed.

I hope my query is clear whether any services need to be restarted if port no in /etc/services is changed.

Please revert with the reply to my query

Regards

From: http://www.unix.com/red-hat/221227-restart-services-if-port-no-changed-etc-services-rhel.html

Computers

Red Hat releases community OpenStack distribution

Leave a comment

Red Hat has launched a community version of its still-in-development OpenStack distribution, and it also released a preview of the enterprise edition of this distribution for those who sign up for an early adopter program.

In much the same way the community driven Fedora Linux tests many of the software programs and utilities that make their way into Red Hat Enterprise Linux (RHEL), so too will this new OpenStack distribution, which Red Hat calls RDO, serve as a proving ground for technologies that may be included in Red Hat‘s enterprise OpenStack distribution.

And like with Fedora, Red Hat is hoping to build a community of developers and users around RDO. The company announced the new community edition at the OpenStack Spring Conference, being held in Portland this week. OpenStack is a collection of open source software designed to offer compute, storage and networking services on an on-demand basis, often called IaaS (infrastructure as a service).

RDO runs on RHEL, Fedora, and other distributions based on RHEL. It includes the core OpenStack components, namely Nova, Glance, Keystone, Cinder, Quantum, Swift, and Horizon. It also comes with a number of new tools still in development, such the Heat cloud application orchestration application, and the Ceilometer resource monitoring and metering utility. Red Hat also created a new installation tool for RDO, called PackStack.

To read this article in full or to leave a comment, please click here

From: http://www.pcworld.com/article/2034674/red-hat-releases-community-openstack-distribution.html#tk.rss_all

Linux

RHEL 5.5: how to remove a clustered VG?

Leave a comment

By peppeunz

Hi all,

I have a 2 node rhel 5.5 cluster (2 server and 1 quorum disk).
I created 2 cluster resources using Luci web console, they are 2 Volume Groups.

I want to remove that cluster and shutdown node 2, but I don’t want to loose data on Volume Groups clustered.

How can I remove that cluster and mount volume Groups (now managed by Luci) without loosing data?

Thanks and regards

From: http://www.unix.com/red-hat/221109-rhel-5-5-how-remove-clustered-vg.html

Linux

SSL certificate generation on OS level or application level

Leave a comment

By RHCE

We have a RHEL 5.8 server at the production level and we have a Java application on this server. I know of the SSL certificate generation at the OS (RHEL) level but it is implemented on the Java application by our development team using the Java keytool. My doubt is that is the SSL generation can be done at the OS level or at the application level also?

I hope, my query is clear that can the SSL generation be done at the application level also in addition to the SSL generation at the OS level.

Please revert with the reply to my query

Regards

From: http://www.unix.com/red-hat/220843-ssl-certificate-generation-os-level-application-level.html

Linux

How to check port used for SSL?

Leave a comment

By RHCE

I have RHEL 5.8 in our production environment. We are using SSL, my query is how to find the port used for SSL. In /etc/services, it shows 443 but when I give

Code:
netstat –tulpn | grep 443

Or

netstat –tulp | grep https

I do not get any output.

I hope, my question is clear of how to find the port used for SSL.

Please revert with the reply to my query.

Regards

…read more

Source: FULL ARTICLE at The UNIX and Linux Forums

Linux

SSH issue – can't get password less login to work

Leave a comment

By bitlord

Hello,
I can’t seem to get the password less login to work on one of my SLES 11 servers. My ssh agent lets me login to all my other servers, which are Solaris 10, RHEL 5, and SLES 11 servers. Some servers mount my home directory and others don’t.

The server that I’m having an issue with doesn’t mount my home directory. I can log in with my password. My agent on a Solaris 10 server is working with the other servers. Usually if the agent is not working it will ask for my passphrase, which leads me to believe it is a configuration issue.

I have copied my pub key over and put in authorized_keys file.

Any ideas?

…read more

Source: FULL ARTICLE at The UNIX and Linux Forums

Linux

Adding a network interface to a bonded interface

Leave a comment

By westmoreland

I have a RHEL 5 system with a bonded interface configure using only one network port (eth0). So I have config file for ifcfg-bond0 and ifcfg-eth[0-5]. I’d like to configure eth5 to be the second SLAVE in the bond. My question is, after I modify ifcfg-eth5, can I add eth5 to the bond0 interface without disrupting network connectivity by simply doing:

Quote:

ifdown eth5

ifup eth5

I’m trying to avoid restarting the network service because I don’t want to interrupt connectivity.

…read more

Source: FULL ARTICLE at The UNIX and Linux Forums

Linux

Implement FTP server on RHEL server without using FTP client

Leave a comment

By RHCE

We have RHEL 5.8 in our environment, I had a query whether we can implement an FTP server using vsftpd package and Linux configurations like setsebool without using any external FTP clients like FileZilla etc. I am very confused on this. The FTP functionalities that should be present are download & upload of files. My observation is that the download of files is not an issue but the upload of files maybe requiring an FTP client.

I hope, my query is clear that can we implement an FTP server on RHEL server without using any external FTP client?

Please revert with the reply to my query as I am very confused on this.

Regards

…read more

Source: FULL ARTICLE at The UNIX and Linux Forums

Linux

Configure LVM to gain access to the data on disks

Leave a comment

By prvnrk

Hello friends,

We had to upgrade RHEL 4.x to 5.7 so we took complete backup. Since DIRECT UPGRADE not possible, we rebuilt 5.7 from scratch.

We had lvm configuration on DATA disks in previous OS and now we need to configure such that we should be able to have same old LVM configuration (like VGs and LVs etc.) so that we could access the data on those volumes.

Could any kind soul provide me step-by-step on how to do this? (Yes, I have backup of /etc/lvm etc. of previous OS).

I thought of just copying Old /etc/lvm into new one and start lvm daemon. will it work?

TIA

…read more
Source: FULL ARTICLE at The UNIX and Linux Forums

Linux

Help understanding differences between AIX and RHEL

Leave a comment

By SpenceSnyder

I have started a new job which requires AIX admin skills, which I have, and RHEL skills. Does anyone have a cheat sheet that if I know how to solve the problem in AIX how would I do that in RHEL? I was an IBM pre-sales technical trying to keep sales guys honest – not possible. Any other links to training would be good motor. Keep in mind I’m not going to pay $2300 for real RHEL training. Thanks to all that help – I need it:)

…read more
Source: FULL ARTICLE at The UNIX and Linux Forums

Linux

Postfix Configuration:Hostname/Domain Name Doubts

Leave a comment

By RedSpyder

I have a RHEL server where I want to create a mail server so I can send myself alerts whenever X process have problems.

Disclaimer:
Im a programmer thats been forced to do IT. So I’m trying my best here.

The problem:
While configuring Postfix it asks for $myhostname which apparently must be in the format hostname.mydomain.com. I do have my $hostname but I dont know the “mydomain” part.

Do “mydomain” is something I create or its something I should get my the networks admins since the server is connected to my company’s network?

If you need output from specific commands let me know.

Thanks in advance!

…read more
Source: FULL ARTICLE at The UNIX and Linux Forums