Unix, Linux, DevOps , Cloud computing and BigData Knowledge-Base
Bash Scripting – Displaying Interactive Messages
Most shell commands produce their own output, which is displayed on the console monitor where the script is running. Many times, however, you will want to add your own text messages to help the script user know what is happening within the script. You can do...
Storage Related tasks – Linux Disk Partitioning
Working with disks is an important part of maintaining storage space on your system. Partitions determine how your storage space is carved out for use later by the system and its users. When adding more storage or creating it for the first time, you should partition...
Solaris Troubleshooting : Identifying the network address and port number for a running process
For Solaris System Administrators It is often necessary to find out all the related processes that are using a specific network port. There are several ways to accomplish this (lsof, pfiles, crash): Method 1: lsof examples: Ex: netstat -a shows a connection between hodware.port 36169 to...
Are you ready to encounter a complete Datacenter power failure ?
The role of system administration involves three different responsibilities. 1. Be ready to Prevent the issues which are Expected to Arise 2. Be ready to Resolve the issues which are already Expected but couldn’t prevent from occurring. 3. Be Ready to Resolve the issues which are...
Storage : Verifying STMS (mpxio) Health
The steps below will help confirm that STMS is being used and both paths are seen. 1. Validate that STMS is enabled: Check that the mpxio-disable parameter is set to “no”. *Solaris[TM] 7,8,9 — check /kernel/drv/scsi_vhci.conf *Solaris[TM] 10 only — /kernel/drv/fp.conf Example: mpxio-disable=”no”; If mpxio-disable is...
Solaris Troubleshooting : SDS/SVM – Replace failed disk from root mirror
You will need the following info handy to proceed with the process: 1. ls -l /dev/dsk/c#t#d#s# of the alternate sub-mirror boot device 2. partition table layout of the failed boot device Part I Creating an openboot prom alias to alternate boot device 1....
Solaris Troubleshooting NFS : Error Codes for ‘NFS write error xx’ or ‘NFS read error xx’
The NFS error macro listing is as follows:
Linux Admin Reference – Network Bonding – Redhat Enterprise Linux ( RHEL5 / RHEL6)
Bonding is a feature that can be enabled bu the Linux kernel, to allow system administrators to combine two or more network interface to form a single, logical “bonded” interface, for redundancy or increased throughput purpose. We can configure Linux bonding in 7 different modes. The behavior of the...
Solaris Troubleshooting Reference: Using Truss to Identify the Signals sending to a Process
One of the Sample Issue: Customer frequently sees in /var/adm/messages syslogd: going down on signal 15
