Linux

Cisco router startup process: ① After power-on, the router executes POST (BOOT self-check). POST is the microcode stored in the ROM to check whether the hardware of the device can run normally. ② Load and execute boot loader (that is, bootstrap, a

To prevent the static resources on the Lighttpd static server from being stolen by its website, add the following anti-leech: #### Referer ### 1. When the image is from a non-frank.com or frank.cn domain name, go Cacti monitoring Lighttpd Ubuntu

To improve the convenience and security of account management, the company decided to upgrade from NIS to LDAP at its own suggestion. After two weeks of research, we finally completed the setup of the LDAP server and integrated it with SVN. During

At the request of the project manager, we need to perform the search function for the project. The task of searching this piece is handed over to me, and the technical solution is Solr. So it took an afternoon to download the latest solr in the

1. What is rsync? (Theory)In short, the main feature is to achieve full and incremental data. local and remote data backup tools are also suitable for indows.Official http://www.samba.org/ftp/rsync/rsync.htmlRsync supports rm deletion between local

As release, Hadoop2.2 does not support 64-bit Linux versions. You need to compile it manually. The following is my installation process: 1. Copy a virtual machine. 2. Download hadoop-2.2.0-src.tar.gz and decompress it to the/opt folder of

Install Hadoop 0.20.2 in CentOS 6.4 Download URL:Http://mirror.bit.edu.cn/apache/Document URLHttp://hadoop.apache.org/docs/Node planning:10.10.1.131 hadoop110.10.1.132 hadoop210.10.1.20.hadoop310.10.1.134 dog10.10.1.135 cat10.10.1.136 gangster1.

Because the Email Filtering hardware in the company's Exchange environment has a single point of failure and does not want to spend more money on this investment, we want to use the Postfix tool to implement a redundant solution. Postfix is the MTA (

Exception description Java. io. IOException: xceiverCount 258 exceeds the limit of concurrent xcievers 256At org. apache. Hadoop. hdfs. server. datanode. DataXceiver. run (DataXceiver. java: 165) View datanode logs *: 50010: DataXceiver error

1. System PreparationInstall Ubuntu13.10, set the source, and then sudo apt-get update and sudo apt-get upgrade 2. Related Software preparation(1) install antSudo apt-get install ant1.7, check the installation situation ant-version appears Apache

I. Introduction: Network Time Protocol (NTP) is used to synchronize time between the distributed time server and the client. NTP transmits data based on UDP packets. The UDP port number is 123. NTP is used to synchronize the clock of all devices in

Cacti has two polling methods: cmd and spine. According to the official introduction, spine polling is much faster than cmd. Host Configuration, 4-Core 2 GB memory for KVM virtual machines 42 monitored hosts, 2070 data queries, and 1399

1) Redis Introduction Redis is a high-performance key-value database. Redis is essentially a Key/Value database, similar to the NoSQL database of Memcached, but its data can be stored persistently on the disk, solving the problem of no data loss

Simple configuration of HeartBeat based on ResourcesLab environment: RedHat5.8 i386Disable the firewall and selinux Software Package: http://dl.Fedoraproject.org/pub/epel/5/i386/repoview/letter_h.group.htmlHeartbeat-Heartbeat subsystem for

Exception 1: 2014-03-13 11:10:23, 665 INFO org. apache. hadoop. ipc. client: Retrying connect to server: Linux-hadoop-38/10.10.208.38: 9000. already tried 0 time (s); retry policy is RetryUpToMaximumCountWithFixedSleep (maxRetries = 10, sleepTime = 1

1. Simply enable the server command: Enter the bin directory and enter the./standalone. sh command. This method of enabling the server has a disadvantage. When your command window is closed, the service is automatically down. 2. Run the command in

JBpm is a flexible and scalable workflow management system. The business process entered by the server during jBpm Runtime is expressed in a simple and powerful language and packaged in the process file. JBpm combines the convenience of workflow

Install NRPE on HPUX, especially when there are some difficult points in monitoring the Oracle database. It should be a memo if you try to sort it out. 1. Download the pre-compiled depot source code package Pack name: NRPE-2.12.depot.gz Free in http:

Today, I purchased Microsoft A0 ECs instances at a price of 0.22 RMB/hour.768M memory, memory G hard drive, 5 MB dedicated bandwidth Install Apache2.4.4 in CentOS 6.3 Install the Apache2.4.9 service.Before installation, check gcc. It is speechless.

I have been learning Hadoop for some time. At first from the beginning of the Hadoop-1.2.1, will write a little MapReduce, or want to keep up with the pace of Hadoop development, although the official version has been released 2.4.0, but the stable