雜七雜八的小筆記!

What do you need to install packages?
# yum install -y qemu-kvm qemu-img \
    virt-manager libvirt libvirt-python \
    libvirt-client virt-install virt-viewer



Reference: http://www.itzgeek.com/how-tos/linux/centos-how-to...

-------------------------------------------------------------------------
deb cdrom:[Debian GNU/Linux 8.2.0 _Jessie_ - Official amd64 DVD Binary-1 20150906-11:13]/ jessie contrib main

# deb http://security.debian.org/ jessie/updates main contrib
# deb-src http://security.debian.org/ jessie/updates main contrib

# jessie-updates, previously known as 'volatile'
# A network mirror was not selected during install. The following entries
# are provided as examples, but you should amend them as appropriate
# for your mirror of choice.
#
# deb http://ftp.debian.org/debian/ jessie-updates main contrib
# deb-src http://ftp.debian.org/debian/ jessie-updates main contrib
-------------------------------------------------------------------------

${subnet}#!/bin/bash
subnet="192.168.100"
`rm -rf ${subnet}_Up.log`
`rm -rf ${subnet}_Down.log`

for i in $(seq 1 254)
do
    ping -c 1 -w 1 ${subnet}.$i && result=0 || result=1
    if [ "$result" -eq 0 ]; then
        echo "${subnet}.$i is Up" >> ${subnet}_Up.log
    else
        echo "${subnet}.$i is Down" >> ${subnet}_Down.log
    fi
done

# vim /var/lib/dhcpd/dhcpd.leases

How to get physical mac address, when other pepole rename your mac address on CentOS.

# cat /var/log/dmesg | grep eth

******************************************************************************
* Copyright (c) 2010-2015 Hewlett-Packard Development Company, L.P. *
* Without the owner's prior written consent, *
* no decompiling or reverse-engineering shall be allowed. *
******************************************************************************

Login authentication

Username: admin
Password:

<HP 1920G Switch> _cmdline-mode on
All commands can be displayed and executed. Continue? [Y/N] Y

↓↓↓↓↓↓↓↓ Default password is below, ↓↓↓↓↓↓↓↓
Please input password: Jinhua1920unauthorized
y wrong use, please carefully use it with our engineer's direction.

1. Get last column
# df -h | awk '{print $NF}'

1) Install packages
# yum install -y kvm libvirt qemu-kvm virt-manager

2)
# chkconfig libvirtd on
# service libvirtd restart

Environment: All users are Read-Only on vsFTPd

[root@localhost ~]# vim /etc/vsftpd/vsftpd.conf
-----------------------------------------------------------
．．．．．．
# Uncomment this to enable any form of FTP write command.
write_enable=NO
．．．．．．
-----------------------------------------------------------

We have create an account "CloudUser", and CloudUser must Read-Write on vsFTPd of user home directory.

root> configure
Entering configuration mode
The configuration has been changed but not committed

(1) We use a example "ping" in the background, and the command (Using "nohup") is below,

# nohup ping www.google.com &

or

# nohup ping www.google.com >> output.log &

1. Create a new account "Cloud-user"
# adduser Cloud-user

2. Add "Cloud-user" into sudo(sudoers) list.
# usermod -a -G sudo Cloud-user

今天假設我們先安裝SSH的Daemon:
# sudo apt-get install openssh-server

安裝sysv-rc-conf package, 用來設定Daemon開機與關機時, Service的啟動與閉關:
# sudo apt-get install sysv-rc-conf

設定在所有Run Level開機時皆自動開啟SSH Daemon:
# sudo update-rc.d -f ssh defaults

設定在所有Run Level開機時皆不開啟SSH Daemon:
# sudo update-rc.d -f ssh remove

設定只在Run Level 2~5自動啟動SSH Daemon, 而開機啟動順位為80 (數值愈大愈晚啟動):
# sudo update-rc.d ssh start 80 2 3 4 5

設定在Run Level 0, 1, 6時自動關閉SSH Daemon, 而關閉順位為20 (數值愈小愈早關閉):
# sudo update-rc.d ssh stop 20 0 1 6

1. We are going to get a key pair (ex: OpenStack.pem).
    (You can get Mirantis OpenStack key pair on Fuel's /root/.ssh/id_rsa)
    The key pair is below,
 

2. Download PuTTYgen. (http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html)
3. Open PuTTYgen, type "Conversions" --> type "Import key" --> import your key pair (ex: OpenStack.pem)