A sample text widget

Etiam pulvinar consectetur dolor sed malesuada. Ut convallis euismod dolor nec pretium. Nunc ut tristique massa.

Nam sodales mi vitae dolor ullamcorper et vulputate enim accumsan. Morbi orci magna, tincidunt vitae molestie nec, molestie at mi. Nulla nulla lorem, suscipit in posuere in, interdum non magna.

TCP dump and NMAP

1, to detect whether the specified network segment FTP service host, do not do DNS reverse analysis

nmap -sS –n –p 21 2, to detect whether the specified server has a specific port services

nmap –n –p T:21-25,80,110,3389–sS

3, the use of TCP connection scan to detect the specified server, even if it […]



EMC has released ScaleIO 2.0 couple of days ago. More information –

Some new features (source ScaleIO 2.0 release notes):

Extended MDM cluster – introduces the option of a 5-node MDM cluster, which is able to withstand two points of failure. Read Flash Cache (RFcache) – use PCI flash cards and/or SSDs for caching of the […]

Useful commands for Hadoop HDFS troubleshooting

[hadoop@master ~]$ hdfs dfsadmin -report 17/04/13 00:06:51 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform… using builtin-java classes where applicable Configured Capacity: 37576769536 (35.00 GB) Present Capacity: 33829806080 (31.51 GB) DFS Remaining: 33829789696 (31.51 GB) DFS Used: 16384 (16 KB) DFS Used%: 0.00% Under replicated blocks: 0 Blocks with corrupt replicas: 0 Missing […]

CentOS 7.3 under the Hadoop 2.7.2 cluster

CentOS 7.3 under the Hadoop 2.7.2 cluster

how to setup a Hadoop cluster on CentOS linux system. Before you read this article, I assume you already have all basic conceptions about Hadoop and Linux operating system.

mv ifcfg-eno16777736 ifcfg-eth0 vi /etc/udev/rules.d/90-eno-fix.rules # This file was automatically generated on systemd update SUBSYSTEM==”net”, ACTION==”add”, DRIVERS==”?*”, ATTR{address}==”00:0c:29:9e:8f:95″, NAME=”eno16777736″


YumDownloader on CentOS 7 / RHEL 7


yum install yum-utils yumdownloader bind-utils [root@lab4 ~]# yum install yum-utils Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: * extras: * updates: Resolving Dependencies –> Running transaction check —> Package yum-utils.noarch 0:1.1.31-40.el7 will be installed –> Processing Dependency: python-kitchen for package: yum-utils-1.1.31-40.el7.noarch –> Processing Dependency: libxml2-python for package: […]



Red Hat Enterprise Linux 7 introduced a new scheme for naming network devices called “Consistent Device Naming”. It’s called Consistent Device Naming because previously the name of the devices [eth0,eth1,eth2] was completely dependant upon the order the kernel detected them as it booted. In certain circumstances, such as adding new devices to an […]

Nginx for serving files bigger than 1GB

ealize that nginx was not serving files larger than 1GB. After investigation I found that it was due to the proxy_max_temp_file_size variable, that is configured by default to serve up to 1024 MB max.

This variable indicates the max size of a temporary file when the data served is bigger than the proxy buffer. If […]

find large files on Linux

Find large files on Fedora / CentOS / RHEL

Search for big files (50MB or more) on your current directory:

find ./ -type f -size +50000k -exec ls -lh {} ; | awk ‘{ print $9 “: ” $5 }’


[]pwd /home []find . -type f -size +50000k -exec ls -lh {} ; | […]

Creating a partition size larger than 2TB on Linux

I had to mount and use a 3TB SATA HD on Linux, and as I thought, I wasn’t going to be able to format and create a new partition using fdisk command.

fdisk tool won’t create partitions larger than 2 TB. This is fine for desktop users, but on a production server you may need […]

HylaFAX with AvantFAX in CentOS 7

hylafax with avantfax installation on CentOS 7  .

With out any talk , lets start…..

Install needed packages ,

# yum install epel-release -y

# yum update -y

# yum groupinstall “development tools” -y

# yum install hylafax wget -y

Download AvantFax from there web site . AvantFax is using for Fax web GUI .


Page 1 of 212