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Linux P2VIntroductionP2V Linux migrations are a combination of science, art and luck.P2V stands for Physical to Virtual. In other words, it is the process or procedure of moving a running system (operating system and everything installed) from a physical machine to a virtual machine.This page describes some of the (un)usual steps necessary to convert a Linux system into a virtual machine running under VMware ESXi Server. The same steps should mostly apply to other virtual platorms/hypervisors like VirtualBox, KVM and QEMU.The focus of this P2V explanation is on Red Hat and CentOS guests as they are not only supported, but benefit from kudzu and rescue disk capability built-in. Other distributions can of course be converted but the exact steps will vary.So, let's get started.What to use (or not)The following software products claim to do P2V, but in fact do not seem to support Linux, so YMMV Virtual Server Migration Toolkit EZP2VThese products do support Linux in some way... VMware Con...
Resolving Linux boot issues after P2V with VMware ConverterRecently I had to deal with migrating SuSE Enterprise Linux servers from the old environment to the Vblock. Customer had a number of physical servers and XEN instances that needed to be moved to the new vSphere environment.While VMware Converter 5 does a good job live-cloning the existing Linux servers, sometimes you have to use the Cold Clone boot CD if the physical server uses software RAID (and then boot VM from the broken mirror side), or sometimes the resulting VM does not boot because of issues with bootloader.For the most migrations I’ve used VMware Converter 5.0. One thing you need to do right away is to modify the config for VMware Converter to enable the root login and keep the failed helper VM. Enable useSourcePasswordInHelperVm flag and disable powerOffHelperVm. See http://kb.vmware.com/kb/1008209 for details.Now you should have the result of your failed conversion preserved, and should be able boot the VM to...
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CentOS 服务器一键安装/配置模板教程 服务系统:CentOS 5/6 32/64位 (支持蜂巢Centos 6.7)推荐宽带:10M 以上更新时间:2016-03-12授权码:sbwml.cn(脚本仅供娱乐,禁止商业用途)1) 使用 root 账号登录 Linux 服务器。2)执行一键安装脚本(需要密钥):如果提示出错 bash: wget: command not found 请执行 yum -y install wget3) 根据终端返回提示完成安装配置。4) 安装完成后,复制终端输出的地址并下载链接中的配置文件。 5) 解压下载的压缩包,提取OpenVPN.ovpn。CA证书:ca.crtTLS密钥:ta.key成品配置文件:OpenVPN.ovpn
Using NAT for container with private IPsUsually you supply public IP addresses to your containers. Sometimes you don't want to do it (lack of IPs, etc.). This article describes how to use private IP addresses for containers.目录1 Prerequisites1.1 IP conntracks1.2 IP forwarding1.3 Enable iptables in OpenVZ 7/Virtuozzo 72 How to create the container and attach network properties to it3 How to provide access for container to the Internet3.1 Save new iptables rules3.2 Firewall3.3 Test4 How to provide access from Internet to a container5 External LinksPrerequisitesMake sure that below prerequisites are met, otherwise it won't work for you!IP conntracksIP connection tracking should be enabled for CT0. For recent OpenVZ kernels (2.6.9 and later) connection tracking for CT0 is enabled by default, but it can be disabled by vzctl 4.7 and newer (because it has a negative impact on venet performance, see OpenVZ Bug #2755). So, make sure there is NO line likeoptions ip_conntrack ip_conntrack_disab...
安装过程中不使用图形界面的新建分区,就不会有100M分区的问题。后续安装只要在命令行新建的分区中进行就可以。(注:用图形界面新建分区,会自动产生一个100M隐藏分区)。具体操作如下:安装Windows2008R2进行到【开始安装】界面的时候,不点击【开始安装】,也不点击【修复计算机】,直接按快捷键“Shift+F10”打开CMD命令行,然后输入>diskpart.exe进入diskpart命令窗口。然后执行以下命令:>list disk     【查看硬盘编号,大小,有U盘的话注意辨别】>select disk 0【选择硬盘编号,使之处于选中焦点状态】>create partition primary size=25064 【创建主分区,后面的数字是大小,单位MB】>format fs=ntfs quick 【格式化主分区,格式为ntfs格式】>create partition extended 【创建扩展分区,如果已有,在图形界面中错误的删掉了系统C盘,这步可不操作】>exit 【退出程序】关闭CMD命令窗口,开始安装,就可以避免100M隐藏分区了。注意,不要在图形界面删除分区再新建,本人经常这样做,但在windows2008R2等新系统就不行了,这样会产生100M隐藏分区。后面的自动安装就可以了。
服务器端安装openvpn在这里http://swupdate.openvpn.org/community/releases/openvpn-install-2.3.4-I004-i686.exe下载openvpn在服务器安装时记得勾选红框中的两个选项安装完成后编辑C:\Program Files (x86)\OpenVPN\easy-rsa目录下的vars.bat.sample文件,修改如下内容然后切换到如下目录cd /D C:\Program Files (x86)\OpenVPN\easy-rsainit-configvarsclean-all生成根证书:build-cabuild-dh生成服务端证书:build-key-server server  生成客户端证书build-key client1将生成的(C:\Program Files (x86)\OpenVPN\easy-rsa\keys 目录下)ca.crt,dh1024.pem,server.crt,server.key复制到C:\Program Files (x86)\OpenVPN\config下在C:\Program Files (x86)\OpenVPN\config创建server.ovpn文件编辑该文件写入一下内容右mode serverlocal 118.184.23.131   port 1194proto udpdev tunca ca.crtcert server.crtkey server.key # This file should be kept secretdh dh1024.pemserver 172.16.1.0 255.255.255.0ifconfig-pool-persist ipp.txtpush "route 0.0.0.0 0.0.0.0"     push "redirect-gateway def1 bypass-dhcp&qu...
MySQL主从复制的原理及配置方法 MySQL 的数据库的高可用性的架构大概有以下几种:集群,读写分离,主备。而后面两种都是通过复制来实现的。下面将简单介绍复制的原理及配置,以及一些常见的问题 一、复制的原理MySQL 复制基于主服务器在二进制日志中跟踪所有对数据库的更改(更新、删除等等)。每个从服务器从主服务器接收主服务器已经记录到其二进制日志的保存的更新,以便从服务器可以对其数据拷贝执行相同的更新。将主服务器的数据拷贝到从服务器的一个途径是使用LOAD DATA FROM MASTER语句。请注意LOAD DATA FROM MASTER目前只在所有表使用MyISAM存储引擎的主服务器上工作。并且,该语句将获得全局读锁定。MySQL 使用3个线程来执行复制功能,其中1个在主服务器上,另两个在从服务器上。当发出START SLAVE时,从服务器创建一个I/O线程,以连接主服务器并让它发送记录在其二进制日志中的语句。主服务器创建一个线程将二进制日志中的内容发送到从服务器。该线程可以识别为主服务器上SHOW PROCESSLIST的输出中的Binlog Dump线程。从服务器I/O线程读取主服务器Binlog Dump线程发送的内容并将该数据拷贝到从服务器数据目录...
Cacti常见问题解决方法6.1 Cacti监控H3C注意的问题(一) 一般说来,Cacti图片的描述都是 |host_description| - Traffic - |query_ifName| 这个形式,对于华为的设备,query_ifName 类似于GigabitEthernet4/3/2形式,应为长度不够,可能导致后面的模块号,端口号无法显示。 GigabitEthernet4/3/2显示成GigabitEthernet。解决方法:Console -> Settings  -> Visual  ->Maximum Field Length: 默认 15,修改成80就OK了。如果不行, 就把所有显示项 长度都修改成80.(二) 对于Traffic 大于100M或是800Mbits/s的无法显示问题。解决方法:在创建graph前修改 Data Templates -> Interface Traffic  ->1: traffic_in  -> Maximum Value Use Per-Data Source Value 默认是100000000 后面再添 加一个0就OK了.2: traffic_out 也要修改,最好在使用new graph创建新的graph之前修改后,否则之后修改会有一定的麻烦,甚至无法正常工作。可以删除图形,新建图形,选 64位流量 统计信息,然后清除缓存,重新生成。或是以下方法:1、修改poller进入cacti ,点击settings ,然后点击右边的Poller,将Poller Interval和Cron Interval全部设置为every minute,...
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