Sohail Riaz

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  • Recover InnoDB tables using .frm and .ibd files

    Apr 12 | Hosting / Servers, Linux, Programming / Scripting | Sohail Riaz | 19659 Views | with 1 Comment

    In this article I will show how to recover or restore InnoDB tables using .frm and .ibd files. MySQL server was enabled with innodb_file_per_table which means  it stores InnoDB tables data in a tbl_name.ibd and table information in tbl.name.frm. If you are using MySQL 5.6.x or higher then you are using innodb_file_per_file as a default. This method will work even you lost original ibdata1 file. Continue Reading

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  • Auto-Reply for Exim Mail Server

    Mar 29 | Hosting / Servers, Linux | Sohail Riaz | 12750 Views | with 4 Comments

    Exim mail server have auto-reply or vacation autoresponder feature missing in default configuration.  It can be easily achieved by providing right Router and Transport configuration using Exim configuration.

    Our setup contains exim + dovecot running imap on CPanel/WHM dedicated server. Dovecot imap using maildir format and default location for storing mail is /home/vmail/$domain/$user. Continue Reading

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  • Update Cobbler Signature File

    Oct 25 | Clusters, Linux | Sohail Riaz | 11099 Views | with 1 Comment

    One of our cluster running cobbler provisioning software required to install several nodes with RHEL 7.1. When I tried to upload an ISO image of RHEL 7.1 to the cobbler, it stops and shows an error that RHEL 7.1 is not available in signatures. Signatures defines which OS cobbler can support for provisioning. By running following command you can list available signatures available for your cobbler installation. Continue Reading

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  • HowTo Edit Initrd.img in RHEL/CentOS 6.x

    Apr 16 | Linux | Sohail Riaz | 26761 Views | with 2 Comments

    In this howto I will describe how to edit initrd.img from iso file to add new drivers in RHEL 6.x. We face an issue to add 40G t4_tom chelsio card driver inside initrd.img to start kickstart installation from Network. The initrd.img comes with RHEL 6.x ISO doesn’t contain this driver and hence we were unable to start kickstart installation from network. Chelsio provided DriverDisk but it doesn’t work because it require to provide it using any dvd or usb drive, which is impossible if you installing large number of nodes and away from your DataCenter. This method can work for any add/edit initrd.img file. For my work I used RHEL 6.5. Before doing it you should have one server running with RHEL 6.5 and updated driver. Continue Reading

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  • Bridged Networking with KVM in CentOS/RHEL 6.x

    Jun 12 | Clusters, Linux | Sohail Riaz | 24429 Views | with No Comments

    In this howto we will setup bridged networking to dedicate physical network device to KVM virtual machines/servers. Its best way to have local network between virtual machines  and provide better performance. Continue Reading

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  • GlusterFS HowTo on CentOS 6.x

    May 25 | Clusters, Linux | Sohail Riaz | 45735 Views | with 14 Comments

    In this howto we will describe in detail how to install / configure GlusterFS 3.3.1 (latest stable) on CentOS 6.3.

    GlusterFS is an open source, powerful clustered file system capable of scaling to several petabytes of storage which is available to user under a single mount point. It uses already available disk filesystems like ext3, ext4, xfs etc to store data and client will able to access the storage as local filesystem. GlusterFS cluster aggregates storage blocks over Infiniband RDMA and/or TCP/IP interconnect in a single global namespace. Continue Reading

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  • How To Enable SSH Key Based Authentication on Dell CMC IDRAC

    May 25 | Clusters, Linux | Sohail Riaz | 18016 Views | with No Comments

    In this howto I will describe how you can enable ssh key based authentication on Dell Blades CMC IDRAC. This will help to manage large number of Dell Blades CMC’s in Datacenter specially in Cluster Environment. You might be using root/calvin or your defined user/pass to login in CMC for management work using web or ssh but to access Dell CMC on ssh key based authentication (password less), you need to use only service account. Dell CMC has limitation, you can only use svcacct (user=service) for ssh key based authentication. Continue Reading

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  • Node Health Check Script in Cluster

    Apr 26 | Clusters, Linux, Programming / Scripting | Sohail Riaz | 77564 Views | with No Comments

    Node health (hardware/software) is very critical in cluster environment. Whether you run a lot of web servers in load balancer or having compute node in High Performance Computing setup, each node is critical which is been used for any type of work. It has to be healthy to run processes we need to run. This script created to check node health before using as a compute node or any service in load balancer. If all checks run fine then node will be mark good and will available to run in production. Continue Reading

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  • How To Enable NTFS Support in CentOS 6.3

    Jan 20 | Linux | Sohail Riaz | 149204 Views | with 42 Comments

    In this how to I will describe how to enable NTFS support in CentOS 6.3. By default CentOS 6.x doesnt comes with NTFS support to mount NTFS partition either on hard disk or usb drives. Fedora provies EPEL repository for Red Hat Enterprise Linux. EPEL (Extra Packages for Enterprise Linux) is a volunteer-based community effort from the Fedora project to create a repository of high-quality add-on packages that complement the Fedora-based Red Hat Enterprise Linux (RHEL) and its compatible spinoffs, such as CentOS and Scientific Linux. NTFS drivers ntfs-3g is available through EPEL repository. Continue Reading

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  • How To Install ATI Radeon Drivers in Fedora 18

    Jan 19 | Linux | Sohail Riaz | 107898 Views | with 40 Comments

    In this how to I will describe how to install ATI Radeon Drivers in Fedora 18. Fedora 18 fresh out and ATI latest driver version 13.1 dont support it. I also checked the older version i.e 12.8 and 12.6 but all of them unable to install on Fedora 18. In future they will provide right drivers for Fedora 18 but for now you can install akmod-catalyst beta driver from rpmfusion repository. Continue Reading

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    GlusterFS HowTo on CentOS 6.x

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About Me

My name is Sohail Riaz, I am an expert level system administrator and worked in several reputed organization. I am currently holding a Senior Support Engineer post at ARAMCO Oil Company Saudi Arabia. I live with Open Source and have contributed several articles / howto’s and softwares. I have deployed several advance technologies including High Availability Clusters, Load Balancers, High End Web Servers, Cloud Computing and currently High Performance Computing Clusters.

Comments

  • Sohail Riaz says: @NASIM: It will be better to create single bond out of 4 or more interfaces you are using to create ...

  • MD NASIM AHMAD says: can we make bond0 and bond1 to bond3 where bond3 is combination of bond1 andbond2bond3=bond0+bon...

  • ether mahmud says: Is it possible to create in particular mail address .... plz share doc step by step...

  • Sohail Riaz says: @Albert: Please post your exim.conf. The error show issue with syntax. Regards, Sohail...

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Recent Posts

  • Apr 12 | 19659 Views | 1 Comment

    Recover InnoDB tables using .frm and .ibd files

  • Mar 29 | 12750 Views | 4 Comments

    Auto-Reply for Exim Mail Server

  • Oct 25 | 11099 Views | 1 Comment

    Update Cobbler Signature File

  • Apr 16 | 26761 Views | 2 Comments

    HowTo Edit Initrd.img in RHEL/CentOS 6.x

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