varsha chage: Linux account expiration details
cloudibee “chage” is the command to list & change the password aging information for linux account. The chage command changes the number of days between password changes and the date of…
Vmware 1.x server : vmware-cmd management utility
In VMware server 1.x, the Command line utility “vmware-cmd” is used to manage the Virtual machines. You can use the vmware-cmd utility to perform various operations on a virtual machine,…
Converting ext2 filesytem to ext3
The ext2 or second extended file system is a file system for the Linux kernel. ext2 is not a journaling file system, whereas, ext3 provides journaling and is almost completely…
IBM Aix Unix: Swap & Paging commands
List the paging space available in the system: Use lsps command.bash-3.00# You can also see the paging details in “prtconf” command. Adding additional paging space : Use mkps command. Verify…
Linux stress testing
Stress is a simple workload generator for Linux. It imposes a configurable amount of CPU, memory, I/O, and disk stress on the system. Capture the cpu load (uptime,mpstat), IO load…
Lightweight Window managers
If you are using Linux as your development environment and completely doing remote development and require some GUI, then you have to use lightweight window managers. Window managers with speed,…
Netapp hammer : Disk & Storage controller stress testing tool
Netapp has an disk & loop stress testing command (in advanced mode) to hammer and load test a filer. This hammer script generates huge I/O operations on the disks –…
Netapp nfsstat
How do you check which nfs client uses most of your filer’s nfs operations? . You have to enable the option “nfs.per_client_stats.enable”. This option would give you per nfs operations…
Vmware 2.0 : CLI management utility
Prior to Vmware server 2.0, vmware-cmd was the command line tool for the managements of the virtual machines. In Vmware 2.0, vmware-vim-cmd is the tool that can be used for…
rsyslogd
Rsyslog is an enhanced multi-threaded syslogd system utility providing support for message logging. Support of both internet and unix domain sockets enables this utility to support both local and remote…
Linux : How to get DHCP server name ?
If your linux machine is running on a dhcp enabled network , how do you identify the dhcp server name ? Check out the file /var/run/dhclient-eth0.lease , replace the eth0…
SSHFS
Worried about often copying files to remote machines using ftp or scp ?. Try using fuse-sshfs . You can download the fuse and sshfs rpm from DAG and install it…
Linux : Network tunable parameters
All TCP/IP tunning parameters are located under /proc/sys/net/. Here is a list of some important tuning parameters: /proc/sys/net/core/rmem_default – Receive window size/proc/sys/net/core/wmem_default – Send window size/proc/sys/net/core/rmem_max – Maximum Receive Window/proc/sys/net/core/wmem_max…
mdadm : Software RAID management in Linux
This utility helps to manage software raid devices on Linux. RAID devices are virtual devices created from two or more real block devices. This allows multiple devices to be combined…
AIX Filesystem tips
1) How to view all filesystems on a machine ? “lsfs” is the command to list all the filesystems on a server. Alternatively, you can also view /etc/filesystems. aix23:# lsfs…