Apache Hadoop configuration Kerberos Guide
Generally, the security of a Hadoop cluster is guaranteed using kerberos. After Kerberos is enabled, you must perform authentication. After verification, you can use the GRANT/REVOKE statement to control role-based access. This article describes how to configure kerberos in a CDH cluster.
1. KDC installation and configuration
Article Title: RedHatAS4WEB service and Virtual Host Configuration Guide. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
I. software used in this article: Sun JDK: j2sdk-1_4_2_09-linux-i586.binApache2.0.54: httpd-2.0.54.tar.gzMySQL: mysql-standard-4.1.14-pc-linux-gnu-i6
Annotation configuration of javax. Persistence in JPA User Guide
Blog type:
Java
JPA Configuration Management beanhibernateorm
JPA annotation persistence class is very convenient, need jar package: ejb3-persistence.jar. I use the following three classes to describe the usage.Sh original reprinted Please note: http://67566894.iteye.com/blog/659829javacode
Git Series 3: git configuration and Usage Guide for windows I. Installation
Default installation: msysgitIi. Configuration
1. Add c: \ Program Files \ git \ etc \ gitconfig:Note !] Change "Your-ID" at the end of the second line to your actual ID on the server. The default name is pinyin.
[Alias] Go = "! Bash-C \ "Git pull git Add .; if [\\\ "$ * \\\" =\\\ "\\\"]
represents the second partition on the hard disk. Therefore, in the Grub program V, the partition of the hard disk is starting from 0, and the number of hard disks is also starting from 0, such as the Ubuntu system HDB5 in the GRUB program is represented as (hd1,4). Note that the previous root represents the boot partition of the operating system, not the root directory.(6) Kernel:kernel and its subsequent sections specify a specific kernel file, and depending on the mount point and attributes
,dc=com ' write by-self-write by * readModify the Olcdatabase={1}monitor.ldifModify The OLCDATABASE\=\{1\}MONITOR.LDIF, change the dn.base to your right one, for example, cn=manager,dc=eddie,dc=comVerify the configuration filesExecute the command to verify the configuration:[Email protected] ~]# Slaptest-u559A89A8 ldif_read_file:checksum error on "/etc/openldap/slapd.d/cn=config/olcdatabase={1}monitor.ldif"
Article title: WINmodem and Linux Configuration Implementation Guide (1 ). Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
Author: Alexander J
This document describes how to run Winmodem in Linux.
1. what is Tom?
1.1 they are cats ......
1.2... but it's not t
ICMP Echos to 192.168.20.1, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 24/48/84 MS
From the above, we can see that through the deployment of layer-3 switching technology, the host between VLANs can communicate with each other. This experiment is complete.
[PL1]Disable layer-3 routing to simulate hosts.
[PL2]Define the default gateway.
[PL3]Enable the layer-3 routing function. By default, the layer-3 Switch disables the routing function. To enable int
link mode, the Web client can only connect to one vcenter Server at a time. Also, be aware that by removing the registered Vcenter server from the Web client, you cannot access the Vcenter server through the Web client.Using the browser-based vsphere Web ClientAfter you install the server side, you can use the Web client to access the Vcenter server or the ESXi host.To access the Web client and log in to Vcenter Server, enter the following address https://(webclient-hostname) (port)/vsphere-cli
settings-xx:parallelgcthreads=n: Sets the number of CPUs used when the parallel collector is collected. Parallel collection//thread count.-xx:maxgcpausemillis=n: Set maximum pause time for parallel collection-xx:gctimeratio=n: Sets the percentage of time that garbage collection takes to run the program. Formula 1/(1+N)Concurrent collector Settings-xx:+cmsincrementalmode: Set to incremental mode. Suitable for single CPU situations (rarely used, deprecated in jdk1.8).-xx:parallelgcthreads=n: Sets
/pacman.d/mirrorlistInstall basic functionality into/MNTPACSTRAP/MNT Base Base-devel3. ConfigurationFirst chroot to/mnt.Arch-chroot/mntFirst create a new password for the root userpasswdSet the supported character set, remove some Chinese comments, and then remove the two English en_US Vim/etc/locale.genAfter editing, execute locale.gen.Setting the time zoneLn–s/user/share/zoneinfo/asia/shanghai/etc/localtimeSet hostnameecho Bihell >/etc/hostnameInstalling the Boot ManagerPacman–s Grub-biosInsta
authority), then open a command window and execute the following statement:CREATE tablespace "St_data" LOGGING datafile ' + filepath/st_data.ora ' SIZE 1000M autoextend on NEXT 100M MAXSIZE UNLIMITED EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO;
CREATE temporary tablespace "st_temp" Tempfile ' +filepath/st_temp.ora ' SIZE 1000M autoextend on NEXT 10M MAXSIZE 4096M EXT ENT MANAGEMENT LOCAL;The above creates two storage spaces, one for storing data, and later for saving temp. We do not n
means they cannot be used Methods such as Response.Redirect and Server.Transfer.Seven. SummaryI have used SQL Server mode to implement session sharing for multiple servers in the company, and the server reboot will not cause the user to start the process again (the session required by the booking process will not be lost). I hope this article will be helpful to the specific session server building personnel.Reference documents:All applications that use a SQL database SQL Server session state ma
, fname, lname) VALUES (1, ' John ', ' Smith ');Insert into Users (userid, fname, lname) VALUES (2, ' John ', ' Zhangsan ');Insert into Users (userid, fname, lname) VALUES (3, ' John ', ' Smith ');Now we execute the following query to see:select * from Users;It is important to note that if you are executing a query with a where condition, the column specified in the condition must be indexed first, otherwise an error will occur:SELECT * from users where lname = ' Smith ';invalidrequest:code=2200
Zenddebugger Configuration Guide. The previous lecture: www.2cto.comos201202118673.html development naturally indispensable debugging, simple and easy-to-use debugging tools can help us quickly find the problem of the program, greatly improve my previous lecture: http://www.BkJia.com/ OS /201202/118673.html
Debugging is indispensable for development. easy-to-use debugging tools can help us quickly discover
Server certificate installation and Configuration Guide (Tomcat 5)
I,Generate certificate request
1. Install JDKJDK support is required to install Tomcat. If you have not installed JDK, you can referDownload Java SE Development Kit (JDK. :Http://java.sun.com/javase/downloads/index.jsp
2. Generate a keystore FileTo generate the keystore file keystore. jks, you must use the JDK keytool. Run the command line
1 Introduction to node. js
Node. JS is a development platform that enables JavaScript to run on the server. It uses the V8 engine to execute JS scripts and provides JS Interfaces Based on commonjs specifications, which makes code development more portable.
Node programming uses the idea of events to asynchronously process disks, networks, user requests, database requests, and so on, so that the execution efficiency of a single thread is higher. Of course, the disadvantage is that asynchronous ex
{yyyy-mm-dd hh: mm: SS} [% C]-[% P] % m % NLog4j. appender. r = org. Apache. log4j. rollingfileappenderLog4j. appender. R. File = D:/Tomcat 4.1/webapps/demo/logs/log4j. LogLog4j. appender. R. maxfilesize = 100kbLog4j. appender. R. maxbackupindex = 1Log4j. appender. R. layout = org. Apache. log4j. patternlayoutLog4j. appender. R. layout. conversionpattern = % P % T % C-% m % NLog4j. appender. r. for details about log4j, we recommend that you read Hilton's study notes and related articles on the
1. Build the project into the project folder
2. Initialize SSH key See the official website Guide. (This machine generates a pair of key,public key to the official website Sshkey below)https://help.github.com/articles/generating-ssh-keys/3. Initialize user name, mailbox
$ git config--global user.name "defnngj"//Give yourself a username$ git config--global user.email "defnngj@gmail.com"//fill in your own mailbox
4.git Init
5.git Add.
6.git commit-m "m
-driver=flocker-v my-named-volume:/opt/webapp--name web training/webapp python app.py
Syntax: VOLUME ['/data ']
USER
Function: Used to specify user name or UID, which will run when run, CMD, and entrypoint instructions are used.
Syntax: USER daemon
Workdir
function: The workdir instruction is used to set the working directory of the Run, CMD, and entrypoint instructions
Syntax: Workdir/path/to/workdir
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