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Centos and Rhel 6.5 Hadoop 2.4 3 Node Server hadoop word has been popular for many years, the mention of big data will think hadoop, hadoop then what role is it? Official definition: hadoop is a developing and running large-scale data processing software platform. Core Words is a platform, which means we have a […] When you need to have proxy connection available to whole system, so dont bother with settings for firefox, yum proxy and similar, its simple as just plain file 😉 just copy & paste following code to terminal window. if you need other shell , like csh , just add another file with csh extension. This […] in /etc/sysctl.conf : net.ipv6.conf.all.disable_ipv6 = 1 in /etc/sysconfig/network : NETWORKING_IPV6=no in /etc/sysconfig/network-scripts/ifcfg-eth0 : IPV6INIT=”no” disable iptables6 – chkconfig –level 345 ip6tables off reboot In /etc/grub.conf edit the kernel lines to include: 1 ipv6.disable=1 The “trick” here, as described by TrevorH1 in #linux, is that programs can still load the module as they wish. You can […] Commands CUT: lspv | cut -c 6-7 lists the hdisks numbers (cuts the 6th and 7tn character (disk nubers)) dlnkmgr view -drv | grep -w 00000 | awk ‘{print $4}’ | cut -d . -f 3 ——————————————————————————– EXPR: integer arithmetic \* multiplication (\ is needed to tell * is not a special character) / division […] Resource limits is the concept where you regulate several resources consumed by a process on an UNIX operating systems. Although the resource limits are set on a per user basis, they are applied per process basis. Therefore, if a user is executing hundreds of processes, the user may consume huge amount of resources, even if […] find / -type f -name *.jpg -exec cp {} . \; find /dir -type f -size 0 -print find . -type f -size +10000 -exec ls -al {} \; find /var/nmon -mtime +30 | xargs -i rm {} find /var/nmon -mtime +1 -exec gzip -9 {} \; find . -atime +1 -type f -exec mv […] Networking Properties There are a few standard system properties used to alter the mechanisms and behavior of the various classes of the java.net package. Some are checked only once at startup of the VM, and therefore are best set using the -D option of the java command, while others have a more dynamic nature and […] echnote (troubleshooting) Problem(Abstract) If the entire network is not IPv6-enabled or capable, users may find that Java programs perform poorly. Resolving the problem This document explains that if the entire network is not IPv6-enabled or capable, users may find that Java programs perform poorly. On IBM i 6.1 and 7.1, the default JVM is the […] |
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