Hadoop-CDH5.7.0 for CentOS7
一、需求
系统
CentOS 7 最小化安装
JDK环境
JDK版本:1.8.0_91 jdk-8u91-linux-x64.rpm
下载地址:http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
CM包
CM版本:5.7.0 cloudera-manager-centos7-cm5.7.0_x86_64.tar.gz
下载地址:http://archive.cloudera.com/cm5/cm/5/cloudera-manager-centos7-cm5.7.0_x86_64.tar.gz
CDH包
CDH版本:5.7.0
CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel.sha1 manifest.json
下载地址
http://archive.cloudera.com/cdh5/parcels/5.7/CDH-5.7.1-1.cdh5.7.1.p0.11-el7.parcel
http://archive.cloudera.com/cdh5/parcels/5.7/CDH-5.7.1-1.cdh5.7.1.p0.11-el7.parcel.sha1
http://archive.cloudera.com/cdh5/parcels/5.7/manifest.json
java-mysql连接jar包
下载地址:http://central.maven.org/maven2/mysql/mysql-connector-java/6.0.2/mysql-connector-java-6.0.2.jar
数据库
类型:MariaDB
版本:5.5.47-MariaDB MariaDB Server
节点
主机名 |
IP地址 |
说明 |
bigdata01.tfpay.com |
172.17.28.1 |
master datanode namenode |
bigdata02.tfpay.com |
172.17.28.2 |
datanode |
bigdata03.tfpay.com |
172.17.28.3 |
datanode |
bigdata04.tfpay.com |
172.17.28.4 |
datanode |
节点的数量可以根据自己的需求变更,也可以在CDH安装完成后,在管理界面自己拓展添加
二、底层环境准备
注:准备安装前需要把相关的包文件下载下来,并上传到服务器上
1、安装JDK
所有节点
1)安装系统原有java
# yum -y install java
# java -version
openjdk version "1.8.0_91"
OpenJDK Runtime Environment (build 1.8.0_91-b14)
OpenJDK 64-Bit Server VM (build 25.91-b14, mixed mode)
# rpm -qa|grep java
javapackages-tools-3.4.1-11.el7.noarch
python-javapackages-3.4.1-11.el7.noarch
java-1.8.0-openjdk-headless-1.8.0.91-0.b14.el7_2.x86_64
java-1.8.0-openjdk-1.8.0.91-0.b14.el7_2.x86_64
tzdata-java-2016d-1.el7.noarch
2)卸载OpenJDK
# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.91-0.b14.el7_2.x86_64
# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.91-0.b14.el7_2.x86_64
# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.91-0.b14.el7_2.x86_64
# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.91-0.b14.el7_2.x86_64
3)安装下载的java
# rpm -ivh jdk-8u91-linux-x64.rpm
Preparing... ################################# [100%]
Updating / installing...
1:jdk1.8.0_91-2000:1.8.0_91-fcs ################################# [100%]
Unpacking JAR files...
tools.jar...
plugin.jar...
javaws.jar...
deploy.jar...
rt.jar...
jsse.jar...
charsets.jar...
localedata.jar...
jfxrt.jar...
# java -version
java version "1.8.0_91"
Java(TM) SE Runtime Environment (build 1.8.0_91-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.91-b14, mixed mode)
# javac -version
javac 1.8.0_91
2、更改主机名和hosts
所有节点
注意每个主机名对应的IP,按实际情况更改。
# echo "bigdata0*.tfpay.com" > /etc/hostname
# echo "172.17.28.1 bigdata01.tfpay.com bigdata01" >> /etc/hosts
# echo "172.17.28.2 bigdata02.tfpay.com bigdata02" >> /etc/hosts
# echo "172.17.28.3 bigdata03.tfpay.com bigdata03" >> /etc/hosts
# echo "172.17.28.4 bigdata04.tfpay.com bigdata04" >> /etc/hosts
3、关闭防火墙
所有节点
# systemctl stop firewalld
# systemctl disable firewalld
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service.
# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
Active: inactive (dead) Jun 20 16:05:43 bigdata05.tfpay.com systemd[1]: Starting firewalld - dynamic firewall daemon...
Jun 20 16:05:45 bigdata05.tfpay.com systemd[1]: Started firewalld - dynamic firewall daemon.
Jun 20 16:17:51 bigdata05.tfpay.com systemd[1]: Stopping firewalld - dynamic firewall daemon...
Jun 20 16:17:52 bigdata05.tfpay.com systemd[1]: Stopped firewalld - dynamic firewall daemon.
# sed -i "s/SELINUX=enforcing/SELINUX=disabled/" /etc/selinux/config
# reboot
重启服务器使hostname和selinux的配置生效
# getenforce
Disabled
# sestatus -v
SELinux status: disabled
4、安装NTP服务
所有节点
# yum -y install ntp
更改配置文件/etc/ntp.conf
在master节点namenode节点
注释掉原有的server指向把时间服务器的域名地址指向一个靠谱可连的时间服务器,我选择的是ntp.api.bz.
# vi /etc/ntp.conf
……
#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst
server ntp.api.gz iburst
......
在其余的节点上,把时间服务器的server指向master namenode节点
# vi /etc/ntp.conf
……
#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst
server 172.17.28.1 iburst
......
所有节点
# systemctl start ntpd
# systemctl enable ntpd
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.
# systemctl start ntpd
# systemctl enable ntpd
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.
5、SSH无密码登陆
配置master namenode节点无密码登陆到其他节点
在master namenode节点
# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 回车
Enter passphrase (empty for no passphrase): 回车
Enter same passphrase again: 回车
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
bc:14:e2:59:42:1f:21:80:eb:49:d8:3b:7c:8d:b7:f9 root@bigdata05.tfpay.com
The key's randomart image is:
+--[ RSA 2048]----+
| ...o o. |
| . . o . |
| o . o + |
|. + . * . |
| + o oo S |
| * o o. . |
| o . o. |
| o |
| .E |
+-----------------+
# ssh-copy-id 172.17.28.2
# ssh-copy-id 172.17.28.3
# ssh-copy-id 172.17.28.4
6、安装数据库
master namenode节点
# yum -y install mariadb-server
# vi /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
symbolic-links=0
character-set-server=utf8 \\添加的行
[mysqld_safe]
log-error=/var/log/mariadb/mariadb.log
pid-file=/var/run/mariadb/mariadb.pid
!includedir /etc/my.cnf.d
# systemctl start mariadb
# systemctl enable mariadb
ln -s '/usr/lib/systemd/system/mariadb.service' '/etc/systemd/system/multi-user.target.wants/mariadb.service'
# mysql_secure_installation
/usr/bin/mysql_secure_installation: line 379: find_mysql_client: command not found
NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
SERVERS IN PRODUCTION USE! PLEASE READ EACH STEP CAREFULLY!
In order to log into MariaDB to secure it, we'll need the current
password for the root user. If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.
Enter current password for root (enter for none):
OK, successfully used password, moving on...
Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.
Set root password? [Y/n] y \\设置数据库root密码
New password: \\设置密码
Re-enter new password: \\再次输入密码
Password updated successfully!
Reloading privilege tables..
... Success!
By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them. This is intended only for testing, and to make the installation
go a bit smoother. You should remove them before moving into a
production environment.
Remove anonymous users? [Y/n] y \\移除匿名用户
... Success!
Normally, root should only be allowed to connect from 'localhost'. This
ensures that someone cannot guess at the root password from the network.
Disallow root login remotely? [Y/n] y \\禁止root用户远程登录
... Success!
By default, MariaDB comes with a database named 'test' that anyone can
access. This is also intended only for testing, and should be removed
before moving into a production environment.
Remove test database and access to it? [Y/n] y \\删除测试数据库
- Dropping test database...
... Success!
- Removing privileges on test database...
... Success!
Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.
Reload privilege tables now? [Y/n] //
... Success!
Cleaning up...
All done! If you've completed all of the above steps, your MariaDB
installation should now be secure.
Thanks for using MariaDB!
数据库只是安装了一下,并没有做一些详细的配置。如果有需求可以另行配置。
7、其他安装与配置
所有节点
# yum -y install psmisc MySQL-python at bc bind-libs bind-utils cups-client cups-libs cyrus-sasl-gssapi cyrus-sasl-plain ed fuse fuse-libs httpd httpd-tools keyutils-libs-devel krb5-devel libcom_err-devel libselinux-devel libsepol-devel libverto-devel mailcap noarch mailx mod_ssl openssl-devel pcre-devel postgresql-libs python-psycopg2 redhat-lsb-core redhat-lsb-submod-security x86_64 spax time zlib-devel
# chmod +x /etc/rc.d/rc.local
# echo "echo 0 > /proc/sys/vm/swappiness" >>/etc/rc.d/rc.local
# echo "echo never > /sys/kernel/mm/transparent_hugepage/defrag" >>/etc/rc.d/rc.local
# echo 0 > /proc/sys/vm/swappiness
# echo never > /sys/kernel/mm/transparent_hugepage/defrag
# yum -y install rpcbind
# systemctl start rpcbind
# echo "systemctl start rpcbind" >> /etc/rc.d/rc.local
三、开始安装CDH
1、传宝、解包
把下载好的一下相应包文件上传到master namenode节点内
mysql-java连接包在所有节点上都要上传
# ls
CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel cloudera-manager-centos7-cm5.7.0_x86_64.tar.gz manifest.json
CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel.sha1 jdk-8u91-linux-x64.rpm mysql-connector-java-6.0.2.jar
# tar zxvf cloudera-manager-centos7-cm5.7.0_x86_64.tar.gz -C /opt/
# ls /opt/
cloudera cm-5.7.0
2、创建数据库
# mysql -uroot -p
Enter password: \\输入数据库密码
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 10
Server version: 5.5.47-MariaDB MariaDB Server Copyright (c) 2000, 2015, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> create database hive DEFAULT CHARSET utf8 COLLATE utf8_general_ci;
Query OK, 1 row affected (0.00 sec) MariaDB [(none)]> create database amon DEFAULT CHARSET utf8 COLLATE utf8_general_ci;
Query OK, 1 row affected (0.00 sec) MariaDB [(none)]> create database hue DEFAULT CHARSET utf8 COLLATE utf8_general_ci;
Query OK, 1 row affected (0.00 sec) MariaDB [(none)]> create database monitor DEFAULT CHARSET utf8 COLLATE utf8_general_ci;
Query OK, 1 row affected (0.00 sec) MariaDB [(none)]> create database oozie DEFAULT CHARSET utf8 COLLATE utf8_general_ci;
Query OK, 1 row affected (0.00 sec) MariaDB [(none)]> grant all on *.* to root@"%" Identified by "1234.com";
Query OK, 0 rows affected (0.00 sec) MariaDB [(none)]> exit
# /opt/cm-5.7.0/share/cmf/schema/scm_prepare_database.sh mysql cm -hlocalhost -uroot -p1234.com --scm-host localhost scm scm scm
JAVA_HOME=/usr/java/jdk1.8.0_91
Verifying that we can write to /opt/cm-5.7.0/etc/cloudera-scm-server
Creating SCM configuration file in /opt/cm-5.7.0/etc/cloudera-scm-server
Executing: /usr/java/jdk1.8.0_91/bin/java -cp /usr/share/java/mysql-connector-java.jar:/usr/share/java/oracle-connector-java.jar:/opt/cm-5.7.0/share/cmf/schema/../lib/* com.cloudera.enterprise.dbutil.DbCommandExecutor /opt/cm-5.7.0/etc/cloudera-scm-server/db.properties com.cloudera.cmf.db.
2016-06-17 13:32:20,562 [main] INFO com.cloudera.enterprise.dbutil.DbCommandExecutor - Successfully connected to database.
All done, your SCM database is configured correctly!
3、创建用户
所有节点
#useradd --system --home=/opt/cm-5.7.0/run/cloudera-scm-server --shell=/bin/false --comment "Cloudera SCM User" cloudera-scm
4、制作本地源
master datanote节点执行
# ls
CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel cloudera-manager-centos7-cm5.7.0_x86_64.tar.gz manifest.json
CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel.sha1 jdk-8u91-linux-x64.rpm mysql-connector-java-6.0.2.jar
# cp CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel.sha1 manifest.json /opt/cloudera/parcel-repo/
# mv CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel.sha1 CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel.sha
5、拷贝jar包
所有节点
# ls
CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel cloudera-manager-centos7-cm5.7.0_x86_64.tar.gz manifest.json
CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel.sha1 jdk-8u91-linux-x64.rpm mysql-connector-java-6.0.2.jar
# cp mysql-connector-java-6.0.2.jar /usr/share/java/mysql-connector-java.jar
# ls
CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel cloudera-manager-centos7-cm5.7.0_x86_64.tar.gz manifest.json
CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel.sha1 jdk-8u91-linux-x64.rpm mysql-connector-java-6.0.2.jar
# cp mysql-connector-java-6.0.2.jar /usr/share/java/mysql-connector-java.jar
master namenode节点
# cp mysql-connector-java-6.0.2.jar /opt/cloudera/parcels/CDH-5.7.0-1.cdh5.7.0.p0.45/lib/hive/lib/
# cp mysql-connector-java-6.0.2.jar /opt/cm-5.7.0/share/cmf/lib/
6、更改配置
# sed -i "s/server_host=localhost/server_host=172.17.28.1/" /opt/cm-5.7.0/etc/cloudera-scm-agent/config.ini
# mkdir /opt/cm-5.7.0/run/cloudera-scm-agent
7、启动服务
master namenode节点
# /opt/cm-5.7.0/etc/init.d/cloudera-scm-server start
除了master namenode节点
# scp -r 172.17.28.1:/opt/cm-5.7.0 /opt
所有节点
# /opt/cm-5.7.0/etc/init.d/cloudera-scm-agent start
8、浏览页面开始安装
1)登陆
打开浏览器,访问maser namenode节点的7180端口
输入用户名和密码admin、admin
2)接受协议
3)选择版本
本文档选择Cloudera Express免费开源版本
4)指定主机
5)选择CDH版本
注:选择在制作本地源时选择的版本,如果选择别的版本的话会去官网下载那样安装速度会很慢
6)检查主机正确性
确保全部验证通过
7)选择安装的服务
本文选择的是安装所有服务
8)角色分配
这里应该根据自己的实际需求和服务器的硬件参数自己选择
9)数据库设置
10)群集设置
可以根据自己的实际情况更改设置,本文采用默认配置。这些配置可以在集群安装完成以后后续更改
11)开始安装
无错误信息全部通过
12)安装完成
第一次安装完成后,会出现一些配置的警告信息。这些可以根据提示信息更改。
四、错误总结
1、pstree: command not found
错误展示
# /opt/cm-5.7.0/etc/init.d/cloudera-scm-server start
/opt/cm-5.7.0/etc/init.d/cloudera-scm-server: line 109: pstree: command not found
Starting cloudera-scm-server: [FAILED]
# /opt/cm-5.7.0/etc/init.d/cloudera-scm-agent start
/opt/cm-5.7.0/etc/init.d/cloudera-scm-agent: line 108: pstree: command not found
Starting cloudera-scm-agent: [FAILED]
原因
因为系统是最小化安装,默认没有安装
解决方法
# yum -y install psmisc
2、cloudera-scm-agent start 启动失败
错误展示
# /opt/cm-5.7.0/etc/init.d/cloudera-scm-agent start
Starting cloudera-scm-agent: [FAILED]
查询日志
、
# cd /opt/cm-5.7.0/log/cloudera-scm-agent/
# ls
cloudera-scm-agent.out
# cat cloudera-scm-agent.out
[22/Jun/2016 11:02:09 +0000] 3695 MainThread agent INFO SCM Agent Version: 5.7.0
Unable to create the pidfile.
原因
经过查找后发现/opt/cm-5.7.0/run目录下没有cloudera-scm-agent文件夹
# cd /opt/cm-5.7.0/run/
# ls
cloudera-scm-server
解决方法
# mkdir /opt/cm-5.7.0/run/cloudera-scm-agent
3、install: invalid user ‘cloudera-scm’
错误展示
# /opt/cm-5.7.0/etc/init.d/cloudera-scm-server start
install: invalid user ‘cloudera-scm’
原因
没有创建运行server的用户
解决方法
#useradd --system --home=/opt/cm-5.7.0/run/cloudera-scm-server --shell=/bin/false --comment "Cloudera SCM User" cloudera-scm
4、检查主机正确性警告
警告
解决方法
# echo 0 > /proc/sys/vm/swappiness
# echo never > /sys/kernel/mm/transparent_hugepage/defrag
# echo "echo 0 > /proc/sys/vm/swappiness" >>/etc/rc.d/rc.local
# echo "echo never > /sys/kernel/mm/transparent_hugepage/defrag" >>/etc/rc.d/rc.local
5、启动Hive失败
错误展示
原因
根据提示发现是没有mysql-java连接的驱动jar包
解决方法
# ls
CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel cloudera-manager-centos7-cm5.7.0_x86_64.tar.gz manifest.json
CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel.sha1 jdk-8u91-linux-x64.rpm mysql-connector-java-6.0.2.jar
# cp mysql-connector-java-6.0.2.jar /opt/cloudera/parcels/CDH-5.7.0-1.cdh5.7.0.p0.45/lib/hive/lib/
6、启动NFS Gateway失败
错误展示
原因
解决方法
# yum -y install rpcbind
# systemctl start rpcbind
# echo "systemctl start rpcbind" >> /etc/rc.d/rc.local
# chmod +x /etc/rc.d/rc.local
7、启动Oozie,impala失败
错误展示
原因
没有mysql-java连接jar包
解决方法
# ls
CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel cloudera-manager-centos7-cm5.7.0_x86_64.tar.gz manifest.json
CDH-5.7.0-1.cdh5.7.0.p0.45-el7.parcel.sha1 jdk-8u91-linux-x64.rpm mysql-connector-java-6.0.2.jar
# cp mysql-connector-java-6.0.2.jar /usr/share/java/mysql-connector-java.jar
Hadoop-CDH5.7.0 for CentOS7的更多相关文章
- centos7+cdh5.10.0搭建
一.选择环境: 1.说明 本次部署使用台机器,3台用于搭建CDH集群,1台为内部源.内部源机器是可以连接公网的,可以提前部署好内部源,本次部署涉及到的服务器的hosts配置如下: 192.168.10 ...
- centos7.5搭建cdh5.13.0
序言 本文集群搭建为三台机器,cdh版本为5.13.0,以下是安装过程中所用到的软件包等,可以自行下载.一.前期准备1.安装环境 系统:centos7.5/最小安装版本/64位 内存:主节点 --&g ...
- CentOS7安装CDH 第五章:CDH的安装和部署-CDH5.7.0
相关文章链接 CentOS7安装CDH 第一章:CentOS7系统安装 CentOS7安装CDH 第二章:CentOS7各个软件安装和启动 CentOS7安装CDH 第三章:CDH中的问题和解决方法 ...
- Ubuntu14.04用apt在线/离线安装CDH5.1.2[Apache Hadoop 2.3.0]
目录 [TOC] 1.CDH介绍 1.1.什么是CDH和CM? CDH一个对Apache Hadoop的集成环境的封装,可以使用Cloudera Manager进行自动化安装. Cloudera-Ma ...
- CentOS7.0分布式安装HADOOP 2.6.0笔记-转载的
三台虚拟机,IP地址通过路由器静态DHCP分配 (这样就无需设置host了). 三台机器信息如下 - 1. hadoop-a: 192.168.0.20 #master 2. ha ...
- Cloudera Hadoop 5& Hadoop高阶管理及调优课程(CDH5,Hadoop2.0,HA,安全,管理,调优)
1.课程环境 本课程涉及的技术产品及相关版本: 技术 版本 Linux CentOS 6.5 Java 1.7 Hadoop2.0 2.6.0 Hadoop1.0 1.2.1 Zookeeper 3. ...
- CentOS7+CDH5.14.0安装全流程记录,图文详解全程实测-8CDH5安装和集群配置
Cloudera Manager Server和Agent都启动以后,就可以进行CDH5的安装配置了. 准备文件 从 http://archive.cloudera.com/cdh5/par ...
- CentOS7+CDH5.14.0安装全流程记录,图文详解全程实测-总目录
CentOS7+CDH5.14.0安装全流程记录,图文详解全程实测-总目录: 0.Windows 10本机下载Xshell,以方便往Linux主机上上传大文件 1.CentOS7+CDH5.14.0安 ...
- centos7安装CDH5.5.0
1.安装jdk mkdir -p /usr/java tar zxvf jdk-7u80-linux-x64.tar.gz -C /usr/java/ vi /etc/profile export J ...
- Pentaho Kettle 6.1连接CDH5.4.0集群
作者:Syn良子 出处:http://www.cnblogs.com/cssdongl 欢迎转载 最近把之前写的Hadoop MapReduce程序又总结了下,发现很多逻辑基本都是大致相同的,于是想到 ...
随机推荐
- bzoj 1264 [AHOI2006]基因匹配Match(DP+树状数组)
1264: [AHOI2006]基因匹配Match Time Limit: 10 Sec Memory Limit: 162 MBSubmit: 793 Solved: 503[Submit][S ...
- spj 设计
在数据库中使用SELECT INTO 语句从SP.J.P表中创建一个新表J_P_SPJ新表J_P_QTY中的属性列包括:工程号 (JNO).工程名(JNAME).零件号(PNO).零件名(PNAME) ...
- 敏捷开发 and 敏捷测试
名词解释 agile: 敏捷的:灵活:敏捷开发. scrum: 扭打,混打:并列争球:参加并列争球. sprint: 冲刺,全速跑. backlog: 积压的工作:积压待办的事务. retrospe ...
- hdu 1106 排序
排序 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submiss ...
- Java NIO框架Netty demo
Netty是什么 Netty是一个java开源框架.Netty提供异步的.事件驱动的网络应用程序框架和工具,用以快速开发高性能.高可靠性的网络服务器和客户端程序. 也就是说,Netty 是一个基于NI ...
- Linux 上Oracle RAC 10g 升级到 Oracle RAC 11g
了解如何在 Oracle Enterprise Linux 5 上逐步将 Oracle RAC 10g 第 2 版升级到 Oracle RAC 11g. Oracle 数据库 11g(即,新一代网格计 ...
- 狗血phonegap备忘录[3.3]
phonegap平台就是个狗血的坑,最近的一个项目技术因为上面选型失败,使用了phonegap,加上客户的要求是"像微信一样",真可谓历经坎坷. 基本上评估一个项目是否应该或者可以 ...
- RHEL6.4编译安装gcc4.8.1
因为平时用的linux虚拟机都是RHEL6.4, 自带的gcc版本号太低,不支持C++11,而从gcc4.8.1開始, gcc完美支持C++11全部特性. 故升级了一下. 以下是具体步骤: 1. 下载 ...
- [PWA] 12. Intro to IndexedDB
Use the library indexedDB-promised. Create a database and stroe: import idb from 'idb'; // Open(db_n ...
- PHP安全编程:会话数据注入 比会话劫持更强大的攻击(转)
一个与会话暴露类似的问题是会话注入.此类攻击是基于你的WEB服务器除了对会话存储目录有读取权限外,还有写入权限.因此,存在着编写一段允许其他用户添加,编辑或删除会话的脚本的可能.下例显示了一个允许用户 ...