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2017년 2월 20일 월요일
2016년 10월 24일 월요일
How to reset Windows Server 2012 administrator password
To reset the password on your Windows 2012 server, simply complete the following steps:
- Boot from the Micrsoft Windows Server 2012 DVD
- From the Windows Setup menu, click “Next”.
- Select “Repair your computer”
- Under Choose and option, click on “Troubleshoot”.
- Under Advanced options, click “Command Prompt”.
- At the command prompt, run the following commands:
- d: cd windows\system32
- ren Utilman.exe Utilman.exe.old
- copy cmd.exe Utilman.exe
- Close the command prompt and then click “Continue”.
- The server should now boot and present the logon screen. Here click Windows Key + U.
- At the prompt you can now change the password, by typing the following command: net user administrator Password123 This will set the password for the Administrator user to be Password123 (case sensitive).
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2016년 9월 6일 화요일
PXE BOOT SETUP
Installation
First, you should Install and configure
DHCP server on your PXE server. To install and configure DHCP server,
refer the following link:
Now, install the following packages for setting up PXE environment:
# yum install httpd xinetd syslinux tftp-server -y
Configure PXE Server
# tree /var/lib/tftpboot/├── CentOS6.5
│ ├── initrd.img
│ └── vmlinuz
├── centos6_5_x86_64
│ └── CentOS-6.5-x86_64-bin-DVD1.iso
├── CentOS7.0
│ ├── initrd.img
│ └── vmlinuz
├── centos_7_x86_64
│ └── CentOS-7-x86_64-DVD-1511.iso
├── chain.c32
├── images
│ ├── centos-6.5-64
│ ├── initrd.img
│ └── vmlinuz
├── initrd.img
├── mboot.c32
├── memdisk
├── menu.c32
├── pxelinux.0
├── pxelinux.cfg
│ └── default
├── Ubuntu14.04
├── ubuntu14.04_64
│ └── ubuntu-14.04.4-server-amd64.iso
├── Ubuntu16.04
├── ubuntu16.04_64
│ └── ubuntu-16.04-server-amd64.iso
└── vmlinuz
Copy the following TFTP configuration files to the /var/lib/tftpboot/ directory.
#cd /usr/share/syslinux/ #cp pxelinux.0 menu.c32 memdisk mboot.c32 chain.c32 /var/lib/tftpboot/
Edit file /etc/xinetd.d/tftp
#vi /etc/xinetd.d/tftp
Enable TFTP server. To d this, change “disable=yes” to “no”.
# default: off
# description: The tftp server serves files using the trivial file transfer \
# protocol. The tftp protocol is often used to boot diskless \
# workstations, download configuration files to network-aware printers, \
# and to start the installation process for some operating systems.
service tftp
{
socket_type = dgram
protocol = udp
wait = yes
user = root
server = /usr/sbin/in.tftpd
server_args = -s /var/lib/tftpboot
disable = no
per_source = 11
cps = 100 2
flags = IPv4
}
Next, create a directory to store CentOS
installation ISO image. and mount the image to that directory as shown
below. I have CentOS 6.5 32bit ISO image on my /root directory.
#mkdir /var/lib/tftpboot/centos6.5
#mount -o loop /var/lib/tftpboot/CentOS-6.5-bin-DVD1.iso /mnt
#cp /mnt/images/pxeboot/vmlinuz, initrd.img /CentOS6.5
Create a apache configuration file for PXE server under /etc/httpd/conf.d/ directory:
#vi /etc/httpd/conf.d/pxeboot.conf
Add the following lines:
Alias /centos6_5 /mnt <Directory /mnt> Options Indexes FollowSymLinks Order Deny,Allow Deny from all Allow from 58.x.x.0/26 </Directory>
Save and close the file.
Then, create a configuration directory for PXE server:
#mkdir /var/lib/tftpboot/pxelinux.cfg
Now, create PXE server configuration file under the pxelinux.cfg:
#vi /var/lib/tftpboot/pxelinux.cfg/default
Add the following lines:
prompt 0
timeout 300
ONTIMEOUT local
Menu title ########## PXE Boot Menu ##########
LABEL CENTOS 6.5 Installation
MENU LABEL centos-6.5-64
KERNEL CentOS6.5/vmlinuz
APPEND initrd=CentOS6.5/initrd.img method=http://58.x.x.50
*Ubuntu
Make sure you are using the one from /install/netboot/ubuntu-installer/amd64
LABEL HardDisk
MENU LABEL ^Hard DIsk
LOCALBOOT 0x80
Configure DHCP Server
Now, we have to configure the DHCP server to work with PXE server.
Edit file /etc/dhcp/dhcpd.conf,
#vi /etc/dhcp/dhcpd.conf
Add the following lines at the end:
allow booting; allow bootp; next-server 58.x.x.50; filename "pxelinux.0";
Save and close the file.
Now, We have come to the end of PXE server configuration. Restart all the services to complete the configuration.
service xinetd restart service httpd restart service dhcpd restart
Configure HTTPD Server
DocumentRoot "/var/www/html"
ServerName 58.x.x.50
#cp /mnt/* /var/www/html/
Installation with Kickstart File
#vi /var/lib/tftpboot/pxelinux.cfg/default
prompt 0
timeout 300
ONTIMEOUT local
menu title ########## PXE Boot Menu ##########
LABEL CENTOS 6.5 Installation
MENU LABEL centos-6.5-64
KERNEL CentOS6.5/vmlinuz ksdevice=eth0
APPEND initrd=CentOS6.5/initrd.img ks=http://IP Address/ks.cfg
LABEL CENTOS 7.0 Installation
MENU LABEL centos-7.0-64
KERNEL CentOS7.0/vmlinuz
APPEND initrd=CentOS7.0/initrd.img ks=http://IP Address/centos7/ks.cfg
LABEL Ubuntu 14.04 Installation
MENU LABEL Ubuntu 14.04
KERNEL
APPEND
LABEL HardDisk
MENU LABEL ^Hard DIsk
LOCALBOOT 0x80
CentOS 6.5
#vi ks.cfg# Kickstart file automatically generated by anaconda.
#version=DEVEL
install
url --url=http://IP Address/
lang en_US.UTF-8
keyboard us
network --onboot yes --device eth0 --bootproto dhcp
rootpw --iscrypted $6$VW.mEEJY9d2fKaNb$3fPvVgdrgrKVwYNVmtU5sWzB3BbiCo.1W5gO4FVE3/6vU.gBZCDtrJ4Urf.f2T3c87gSlPqQYqkKU39tzVsCN1
firewall --service=ssh
authconfig --enableshadow --passalgo=sha512
selinux --enforcing
timezone --utc Asia/Seoul
bootloader --location=mbr --driveorder=sda --append="crashkernel=auto rhgb quiet"
# The following is the partition information you requested
# Note that any partitions you deleted are not expressed
# here so unless you clear all partitions first, this is
# not guaranteed to work
clearpart --all --drives=sda
#volgroup VolGroup --pesize=4096 pv.008002
#logvol /home --fstype=ext4 --name=lv_home --vgname=VolGroup --grow --size=100
#logvol / --fstype=ext4 --name=lv_root --vgname=VolGroup --grow --size=1024 --maxsize=51200
#logvol swap --name=lv_swap --vgname=VolGroup --grow --size=7968 --maxsize=7968
part /boot --fstype=ext4 --size=500
part swap --fstype=swap --recommended
part / --fstype=ext4 --size=940000
#part pv.008002 --grow --size=1
repo --name="CentOS" --baseurl=http://IP Address --cost=100
reboot
%packages
@core
@server-policy
@workstation-policy
%end
CentOS 7.0
#vi ks.cfg
#version=DEVEL # System authorization information auth --enableshadow --passalgo=sha512 # Use network installation url --url="http://IP Address/centos7" # Use graphical install graphical # Run the Setup Agent on first boot firstboot --enable ignoredisk --only-use=sda # Keyboard layouts keyboard --vckeymap=us --xlayouts='us' # System language lang en_US.UTF-8 # Network information network --bootproto=dhcp --device=eno1 --onboot=on --ipv6=auto network --bootproto=dhcp --device=eno2 --onboot=on --ipv6=auto network --hostname=localhost.localdomain # Root password rootpw --iscrypted $6$b.HgyW9b6uH9fHvQ$mjPxiumdpTatP3GXL9ziIaUpxUVcreGFjG0Vb8iEU9nJuXISLnlAzcGnFQB1I2svRvdodz8zWw4qqeCzYnkH50 # System timezone timezone Asia/Seoul --isUtc # System bootloader configuration bootloader --append=" crashkernel=auto" --location=mbr --boot-drive=sda # Partition clearing information clearpart --all --initlabel --drives=sda # Disk partitioning information part /boot --fstype="xfs" --ondisk=sda --size=500 part pv.369 --fstype="lvmpv" --ondisk=sda --size=953368 volgroup centos --pesize=4096 pv.369 logvol / --fstype="xfs" --grow --maxsize=51200 --size=1024 --name=root --vgname=centos logvol swap --fstype="swap" --size=8064 --name=swap --vgname=centos logvol /home --fstype="xfs" --grow --size=500 --name=home --vgname=centos reboot %packages @^minimal @core kexec-tools wget net-tools %end %addon com_redhat_kdump --enable --reserve-mb='auto' %end
2016년 8월 23일 화요일
How to Assign SR-IOV Enabled NICs with XenServer 6.x
Objective
This article describes how to assign SR-IOV enabled Network Interface Cards (NICs) to Virtual Machines (VMs) for maximum performance by using the Single Route I/O Virtualization (SR-IOV) capabilities of XenServer 6.1.0.Note: SR-IOV is supported only with SR-IOV enabled NICs listed on the XenServer Hardware Compatibility List (HCL) and only when used in conjunction with a Windows Server 2008 guest operating system.
Single Root I/O Virtualization (SR-IOV) is a PCI device virtualization technology that allows a single PCI device to appear as multiple PCI devices on the physical PCI bus. The actual physical device is known as a Physical Function (PF) while the others are known as Virtual Functions (VF). The purpose of this is for the hypervisor to directly assign one or more of these VFs to a VM using SR-IOV technology: the guest can then use the VF as any other directly assigned PCI device.
Assigning one or more VFs to a VM allows the VM to directly exploit the hardware. When configured, each VM behaves as though it is using the NIC directly, reducing processing overhead and improving performance.
WARNING! If your VM has an SR-IOV VF, functions that require VM mobility are not possible. For example, Live Migration, Workload Balancing, Rolling Pool Upgrade, High Availability and Disaster Recovery, cannot be used. This is because the VM is directly tied to the physical SR-IOV enabled NIC VF. In addition, VM network traffic sent via an SR-IOV VF bypasses the vSwitch, so it is not possible to create Access Control Lists (ACL) or view Quality of Service (Qos).
Instructions
To enable SR-IOV on Intel NICs:
WARNING! Customers must not attempt to boot a SR-IOV enabled VM before carrying out the following steps.-
For Intel 1GBe NICs edit /etc/modprobe.d/igb and uncomment the line that includes:
#options igb max_vfs=7,7,7,7
-
For Intel 10GBe NICs edit /etc/modprobe.d/ixgbe and uncomment the line that includes:
#options ixgbe max_vfs=40,40
To assign an SR-IOV enabled NIC VF to a Virtual Machine on XenServer 6.1.0:
-
Open a local command shell on your XenServer host.
-
Run the command lspci to display a list of the Virtual Functions (VF).
For example:
07:10.0 Ethernet controller: Intel Corporation 82559 Ethernet Controller Virtual Function (rev 01)
In this example, 07:10.0 is the bus:device.function address of the VF.
-
Assign the required VF to the target VM by running the following commands:
xe vm-param-set other-config:pci=0/0000:<bus:device.function> uuid=<vm-uuid>
-
Start the VM, and install the appropriate VF driver for your specific hardware.
Note: You can assign multiple VFs to a single VM, however the same VF cannot be shared across multiple VMs.
2016년 7월 29일 금요일
XenServer 7.0: Release Notes Welcome to XenServer 7.0.
XenServer 7.0: Release NotesWelcome to XenServer 7.0.
This document provides important information about the XenServer 7.0 release. For frequently asked questions about XenServer, refer to the XenServer 7.0 Technical FAQ. Documentation may be updated or changed after the initial release. Citrix suggests regularly visiting the XenServer 7.0 page on Citrix Product Documentation to learn about updates. Customers can download the latest version of the XenServer 7.0.0 Base Installation ISO from the XenServer Product Download page.
Note: The XenServer 7.0.0 Base Installation ISO has been reissued on 6 July 2016 to include hotfix XS70E004. The reissued ISO also contains an updated version of the XenCenter Management Console (v7.0.1). This version of XenCenter is same as the version available to download on the XenServer 7.0 Download page and hotfix XS70E001.
This document provides important information about the XenServer 7.0 release. For frequently asked questions about XenServer, refer to the XenServer 7.0 Technical FAQ. Documentation may be updated or changed after the initial release. Citrix suggests regularly visiting the XenServer 7.0 page on Citrix Product Documentation to learn about updates. Customers can download the latest version of the XenServer 7.0.0 Base Installation ISO from the XenServer Product Download page.
Note: The XenServer 7.0.0 Base Installation ISO has been reissued on 6 July 2016 to include hotfix XS70E004. The reissued ISO also contains an updated version of the XenCenter Management Console (v7.0.1). This version of XenCenter is same as the version available to download on the XenServer 7.0 Download page and hotfix XS70E001.
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2016년 7월 13일 수요일
RAID Scrubbing
RAID Scrubbing*
RAID scrubbing is a data maintenance feature that inspects volumes or disk groups and repairs any detected data inconsistencies. This function can be used with volumes or disk groups that implement SHR (comprised of three or more disks), RAID 5, or RAID 6.
We recommend regularly performing RAID scrubbing in order to maintain data consistency and avoid losing any critical data in the event of hard drive failure.
To perform RAID scrubbing:
- Open Storage Manager.
- Go to Volume or Disk Group.
- Select the volume or disk group on which to perform RAID scrubbing.
- Click Manage.
- Select RAID scrubbing.
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