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Recover InnoDB tables using .frm and .ibd files
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
Read More »InnoDBtables 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 -
Auto-Reply for Exim Mail Server
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
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
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
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
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
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
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
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
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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