There are so many commands of Ubuntu, we just need to know useful and high-frequency commands. I have collected a little common commands which may be  useful for you in the future. Check the size of directory sudo df -h #show the current info of part…

A disk array controller has a function of relocating a plurality of data blocks stored in a disk array. The controller includes a read unit which reads data blocks to be relocated from the disk array, a determining unit which determines whether an er…

SQL> select * from v$version; BANNER --------------------------– Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 – 64bit Production PL/SQL Release 11.2.0.3.0 – Production CORE 11.2.0.3.0 Production TNS for Linux: Version 11.2.0.3.0 – Produc…

What is LDAP and how does it work(implementation)? LDAP stands for “Lightweight Directory Access Protocol”. It is a simplification of the X.500 Directory Access Protocol (DAP) used to access directory information. A directory is essentially a special…

QUESTION 13 View the Exhibit.Examine the following command that is executed for the TRANSPORT table in the SH schema:SQL> SELECT DBMS_STATS.CREATE_EXTENDED_STATS('sh', 'customers_obe', '(country_id,cust_state_province)') FROM dual;Which statement des…

DHCPRELEASE, DHCP release message / DHCP 释放消息 DHCPREQUEST, DHCP request message / DHCP 请求消息 dial 拨号位置 dial-up connection / 拨号连接 dial-up 拨号线路 differential 差异备份 digital signature / 数字签名 Digital Signature Standardm, DSS / 字签名标准 digital subscriber line, …

Microsoft Win32 to Microsoft .NET Framework API Map .NET Development (General) Technical Articles     Microsoft .NET Framework and Microsoft Visual Studio User Education TeamsMicrosoft Corporation January 2004 Applies to:    Microsoft® .NET Framework…

转自:https://www.kernel.org/pub/linux/docs/lanana/device-list/devices-2.6.txt LINUX ALLOCATED DEVICES (2.6+ version) Maintained by Torben Mathiasen <device@lanana.org> Last revised: 25 January 2005 This list is the Linux Device List, the official regi…

Quick links Home page Blog Download Forum What’s new About From project’s home page: psutil (python system and process utilities) is a cross-platform library for retrieving information on running processes and system utilization (CPU, memory, disks,…

About Storage Tiers Ehcache has three storage tiers, summarized here: Memory store – Heap memory that holds a copy of the hottest subset of data from the off-heap store. Subject to Java GC. Off-heap store – Limited in size only by available RAM. Not…

Contents [hide]  1 ⁠Accessing the User Portal 1.1 Logging in to the User Portal 1.2 Logging out of the User Portal 1.3 Logging in for the First Time: Installing the Engine Certificate 1.3.1 Installing oVirt Certificate in Firefox 2 ⁠Installing Suppor…

nginx (pronounced "engine x") is a free open source web server written by Igor Sysoev, a Russian software engineer. Since its public launch in 2004, nginx has focused on high performance, high concurrency and low memory usage. Additional feature…

psutil documentation¶ Quick links Home page Install Blog Forum Download Development guide What’s new About psutil (python system and process utilities) is a cross-platform library for retrieving information on running processes and system utilization…

CreateFile Creates or opens a file or I/O device. The most commonly used I/O devices are as follows: file, file stream, directory, physical disk, volume, console buffer, tape drive, communications resource, mailslot, and pipe. The function returns a…

Creates or opens a file or I/O device. The most commonly used I/O devices are as follows: file, file stream, directory, physical disk, volume, console buffer, tape drive, communications resource, mailslot, and pipe. The function returns a handle that…

环境准备: 一台服务器 [root@admin tftpboot]# cat /etc/redhat-release CentOS Linux release 7.2.1511 (Core) [root@admin tftpboot]# uname -a Linux admin 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 19 22:10:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux [root@admin tftpboot]…

本文目录: 1.1 pxe安装系统 1.2 cobbler基本介绍 1.3 安装和配置cobbler 1.3.1 安装cobbler 1.3.2 配置dhcp和tftp 1.4 cobbler从本地光盘安装系统 1.4.1 生成distro 1.4.2 提供kickstart文件 1.4.3 提供profile 1.4.4 开始安装 1.5 比pxe+kickstart好的地方 1.6 让新机器自动执行脚本 1.1 pxe安装系统 pxe的大致过程如下图. 其中pxelinux.0为bootlo…

在CentOS6上利用PXE+Kickstart+Apache+DHCP实现无人值守安装 1.PXEServer:OS:CentOS6.9IP:172.16.25.69: (1)apache:# mount /dev/cdrom /media/cdrom# yum install httpd -y# vim /etc/httpd/conf/httpd.conf......Listen 172.16.25.69:80DocumentRoot "/media"<Directory &…

File I/O Introduction     We'll start our discussion of the UNIX System by describing the functions availablefor file I/O-open a file, read a file, write a file, and so on. Most file I/O on a UNIX system can be performed using only five functions: open, re…

env 系统环境配置,软件包安装 centos7 yum update -y sed -i s/SELINUX=enforcing/SELINUX=disabled/g /etc/sysconfig/selinux # the file in some versions of the system are in /etc/selinux/config setenforce 0 service iptables stop #or systemctl stop firewalld hostnamec…

ROS(indigo) 安装和使用更新版本的Gazebo,本文以7为例. Gazebo7支持更多新的功能,如果使用下面命令安装ROS(indigo): ~$ sudo apt-get install ros-indigo-desktop-full 那么配套安装的是Gazebo2,如何在ROS(indigo)中使用更新版本的Gazebo呢? 首先,需要卸载ros-indigo-desktop-full等,如下: sudo apt-get remove ros-indigo-desktop-full…

致谢源代码网址:https://github.com/Tutorgaming/kamtoa-simulation kamtoa simulation学习与示例分析(一) 源码学习与分析是学习ROS,包括RVIZ和Gazebo等必须的过程,大量代码的阅读能够提高加快理解熟练使用ROS Kinetic. 首先,先看文件组织: 一般README中有详细的使用说明,包括安装,使用和示例教程. CMakeLists.txt: # toplevel CMakeLists.txt for a catkin w…

linux 命令中英文对照,收集   linux 命令英文全文 Is Linux CLI case-sensitive? The answer is, yes. If you try to run LS instead of ls, it would display an error. There are some advantages of using a case-sensitive command line. The computers that existed in earlier de…

I was trying to understand what kind of image nova image-create creates. It's not entirely obvious from its help output, which says - Creates a new image by taking a snapshot of a running server. But what kind of snapshot? let's figure. nova image-cr…

一.cobbler简介 cobbler 是一个系统启动服务boot server,可以通过pxe得方式用来快速安装,重装系统,支持安装不同linux发行版和windows.这个工具是用python开发,方便小巧,15k行代码,使用简单得命令完成pxe网络安装环境配置,还可以管理dhcp,dns,yum包镜像. cobbler可以命令行,也可以web(cobbler-web),还提供api接口,可以方便二次开发使用 其实就是多安装树得pxe环境,是pxe得高级应用 二.cobbler可以提供得功能…

  无人值守安装(自动按定制的需求来批量安装linux系统) kickstart cobbler linux安装系统的方法: 1,光盘 把iso镜像刻录(windows下有类似nero这类软件)到光盘里,通过光驱,再修改BIOS第一启动顺序为光驱进行安装 2,u盘 把iso镜像刻录(windows下有类似nero这类软件)到U盘里(具体过程请上网自已查),通过USB接口,再修改BIOS第一启动顺序为U盘进行安装 3,硬盘 在linux硬盘上有iso镜像,可以通过grub进行硬盘安装第二个操作系统…

cobbler介绍 cobbler官网:http://cobbler.github.io/用个人的话来说就是cobbler就是一款通过网络快速安装Linux操作系统的产品.cobbler可以配置,管理DNS和DHCP,包括软件包的更新,电源管理,配置管理流程等,类似于PXE+Kickstart. 系统实验环境介绍和准备 系统环境介绍 [root@linux-node1 ~]# cat /etc/redhat-release CentOS Linux release 7.1.1503 (Core)…

Malware Analysis Tutorial 8: PE Header and Export Table 2. Background Information of PE HeaderAny binary executable file (no matter on Unix or Windows) has to include a header to describe its structure: e.g., the base address of its code section, dat…

功能说明:显示inode内容.语 法:stat [文件或目录]补充说明:stat以文字的格式来显示inode的内容. ls 命令及其许多参数提供了一些非常有用的文件信息.另一个不太为人所熟知的命令 stat 提供了一些更为有用的信息. 下面演示了如何对可执行文件“oracle”(位于 $ORACLE_HOME/bin 目录下)使用此命令.   # cd $ORACLE_HOME/bin   # stat oracle     File: `oracle'     Size: 93300148  …

preface 我们之前批量安装操作系统的时候都是采用pxe来安装,pxe也是通过网络安装操作系统的,但是PXE依赖于DHCP,HTTP/TFTP,kicstart等支持.安装流程如下所示: 对于上面的PXE安装流程,我们需要知道我们做了以下的工作: 配置服务,如DHCP.TFTP.(HTTP.FTP.和NFS) 在dhcp和TFTP配置文件中填入客户端机器的信息. 创建自动部署文件(比如kickstart) 将安装的媒介解压缩到HTTP/FTP/NFS存储库中. PXE装机也是一个不错的选择对…