AWS Administration – Associate – Assessment 10
[mlw_quizmaster quiz=13]
Unix, Linux, DevOps , Cloud computing and BigData Knowledge-Base
Solaris SDS : Both Submirrors go into ‘Needs Maintenance’ when I/O is performed but no disk errors seen
The following is the Sample SVM(Solaris Volume Manager) configuration of the layered soft partition. d50: Soft Partition Device: d100 State: Okay Size: 10485760 blocks (5.0 GB) Extent Start Block Block count 0 1 10485760 d100: Mirror Submirror 0: d101 State: Okay Submirror 1: d102 State: Okay...
Linux Virual Machines : Add additional storage and extend LV with the additional space.
In this post I am explaining about the procedure to add 20G to /applocal volume configured in Virtual Linux Machine. A new Disk sdb is partitioned as sdb1 and it was allocated to LVM from outside, and after the reboot the disk is visible to Linux...
Linux Admin Troubleshooting Reference – Kernel Panic and System Crash – Redhat Enterprise Linux (RHEL6)
What is the meaning of a Linux System Crash? Crash is a generic term used usually to say that the system has come to halt and no progress is observed. The system seems unresponsive or has already rebooted. Kernel Panic – A voluntary halt to...
Linux – Online configuration of new SAN disks to create new sybase raw volumes, using LVM.
As part of regular System Admin task we were asked to configure new storage to an existing sybase server without disturbing the existing storage and expecting no downtime for the existing production server. All necessary storage LUNS were already allocated by the Storage team as mentioned...
Solaris 11 – How to display Information About Files and Disk Space
How to Display Information About Files and Disk Space Display information about how disk space is used by using the df command. $ df [directory] [-h] [-t] df With no options, lists all mounted file systems and their device names, the number of 512-byte...
Linux : Identifying Disk Errors in Linux
Below procedure can be used to identify the hard disk errors in linux operating system. Execute the following command to identify the available disk configuration # /bin/more /proc/scsi/scsi Output will include all the currently available disks to the linux, and the output vary depending on...
Storage : "Failed to create nodes for pwwn" error during solaris boot
If Fibre Channel devices are not present or turned off, boot errors will occur. Without corrective action, these errors will persist for every re-boot. The boot errors which are linked to this problem, can be found in the /var/adm/messages file, and are formatted as follows:
Mastering Grub – Part 2 – Grub Configurations
1. Grub Configurations GRUB is configured using ‘grub.cfg’, usually located under ‘/boot/grub’. This file is quite flexible, but most users will not need to write the whole thing by hand. 1.1 Simple configuration handling The program ‘grub2-mkconfig’ generates ‘grub.cfg’ upgrading a distribution, and will discover available...
Solaris [ 9 / 10 ]Troubleshooting: Controlling SSH Connections
The sshd daemon that comes with the Solaris 9 & 10 Operating System uses TCP (Transmission Control Protocol) Wrappers (also called “libwrap”) to control access to hosts. (Unlike other systems, Solaris 9 & 10 does not use the OpenSSH keywords “AllowHosts” and “DenyHosts” to permit or...
