Operating System | Hari's Technical Space

Category Archives: Operating System

Linux KVM: Disable virbr0 NAT Interface

Posted on April 5, 2017 by chriszones2000 Leave a comment

The virtual network (virbr0) used for Network address translation (NAT) which allows guests to access to network services. However, NAT slows down things and only recommended for desktop installations. To disable Network address translation (NAT) forwarding type the following commands: Display Current Setup Type the following command: # ifconfig Sample outputs: virbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00 inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0

TIBCO Administrator – Error (Core Dump Error)

Posted on April 3, 2017 by chriszones2000 Leave a comment

Sometimes the administrator process in UNIX Platform Stops intermittently and then in the following location, $TIBCO_HOME/administrator/<version>/tomcat/hs_err_pid<pid_of_admin>.log file you will see a core dump error something like this # # A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x00007efcdb723df8, pid=12496, tid=139624169486080 # # JRE version: Java(TM) SE Runtime Environment (8.0_51-b16) (build 1.8.0_51-b16) #

/dev/random vs /dev/urandom

Posted on March 30, 2017 by chriszones2000 Leave a comment

If you want random data in a Linux/Unix type OS, the standard way to do so is to use /dev/random or /dev/urandom. These devices are special files. They can be read like normal files and the read data is generated via multiple sources of entropy in the system which provide the randomness. /dev/random will block after the entropy pool is

10 Important “rsync” command – UNIX

Posted on March 9, 2017 by chriszones2000 Leave a comment

Rsync (Remote Sync) is a most commonly used command for copying and synchronizing files and directories remotely as well as locally in Linux/Unix systems. With the help of rsync command you can copy and synchronize your data remotely and locally across directories, across disks and networks, perform data backups and mirroring between two Linux machines. This article explains 10 basic

Fork: retry: Resource temporarily unavailable

Posted on March 3, 2017 by chriszones2000 2 comments

Issue: It was reported that a particular application user is not able to Login. Troubleshoot: 1. Tried Logging to the system with root user it was fine. 2. Tried to switich user it failed with an Error “Write Failed; Broken Pipe” 3. Created a file and it was working. 4. Tried switch the user. This time it goes through. 5.

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