Configure DHCP (Dynamic Host Configuration Protocol) Server in RHEL/Centos 7

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### Install DHCP Server [root@testos ~]# yum -y install dhcp ### Configure DHCP Server [root@testos ~]# vi /etc/dhcp/dhcpd.conf # create new # specify domain name option domain-name “unixtest.com”; # specify name server’s hostname or IP address option domain-name-servers testos.unixtest.com; # default lease time default-lease-time 600; # max lease time max-lease-time 7200; # this DHCP server … Read more

How to Set the JVM Time Zone

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In this tutorial, we’ll take a look at several ways we can modify the time zone of the JVM. Introduction to Time Zone By default, the JVM reads time zone information from the operating system. This information gets passed to the TimeZone class, which stores the time zone and calculates the daylight saving time. We can call the … Read more

What is open source software?

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Overview Open source software is released through a specific kind of license that makes its source code legally available to end-users. There are many such licenses, but typically software is considered open source if: Is open source software free? Open source software does not necessarily mean that executable software is given away for free. It does, however, mean that … Read more

Data Domain – System Tuning Guide for Solaris 10 / Solaris 11

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How to fine tune your Solaris backup servers: Recommended mount option For Solaris 10 #mount -F nfs -o hard,intr,llock,vers=3,proto=tcp,sec=sys, timeo=1200,rsize=1048576,wsize=1048576 HOSTNAME:/backup /ddr/backup # mount -F nfs -o hard,intr,llock,vers=3,proto=tcp,sec=sys, timeo=1200,rsize=1048576,wsize=1048576 HOSTNAME:/data/col1/<mtree> /ddr/<mountpoint> For Solaris 11 #mount -F nfs -o hard,intr,llock,vers=3,sec=sys,timeo=1200,rsize=1048576,wsize=1048576 HOSTNAME:/backup /ddr/backup # mount -F nfs -o hard,intr,llock,vers=3,sec=sys,timeo=1200,rsize=1048576,wsize=1048576 HOSTNAME:/data/col1/<mtree> /ddr/<mountpoint> Recommended Network Settings: Data Domain recommends … Read more

Setup and Configure Network Aggregation Under Solaris 10 / Solaris 11

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An aggregation is similar to an IPMP link created for failover, but has other advantages: Early versions of Solaris 10 do not have this facility – you would need to download the Sun Trunking software to get it. ### Solaris 10 configuration: To show the available network interfaces: [root @ soltest]~ # dladm show-link LINK … Read more