Unix, Linux, DevOps , Cloud computing and BigData Knowledge-Base

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RHEL 5 Linux : configure Kdump on Red Hat Enterprise Linux 5

Installing required packages RHEL 5 has the Kdump packages installed by default. If for any reason they are not installed, you need to install the packages “kexec-tools-.rpm” and “system-config-kdump-.rpm” with the following commands:   # rpm -ivh kexec-tools-.rpm system-config-kdump-.rpm or, if your system is registered at...

1

Solaris Troubleshooting NFS : error “setuid execution not allowed”

To prevent network break-ins, the “-nosuid” option is used in  “/etc/vfstab” and the “/etc/auto*” configuration files  used for NFS mounting filesystems. In “/var/adm/messages”, (the system log files),  the following type of message appears frequently: “Date machinename enterprise: save,uid 0:setuid execution not allowed”

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SAN (Storage area Networking) for System Administrators

 In conventional IT systems, storage devices are connected to servers by means of SCSI cables. The idea behind storage networks is that these SCSI cables are replaced by a network, which is installed in addition to the existing LAN.  Server and storage devices can exchange data...

1

Solaris SVM : Grow Mirrored root under SDS / SVM

This is a step by step procedure to grow a root filesystem which is mirrored using Solstice Disksuite or Solaris Volume Manager. It is strongly recommended that a backup of the root filesystem be performed  prior to following this procedure. Also, experience with the Disksuite or Solaris Volume...

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Cloud Computing – It's not just another buzzword, but a near future

WHAT IS CLOUD COMPUTING? Google, Yahoo, Amazon, and others have built large, purpose-built architectures to support their applications and taught the rest of the world how to do massively scalable architectures to support compute, storage, and application services. Cloud computing is about moving services, computation and/or...

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Veritas VxVM : Fails to start after rebooting the system

Upon boot-time startup, the VERITAS Volume Manager configuration daemon vxconfigd scans all the disks and reads the private regions on the disks. It has been observed in some rare situations, where – I/Os to a disk are failing, and – there are lengthy delays before the...

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