[daemon]

AutomaticLogin=root

AutomaticLoginEnable=true

TimedLoginEnable=true

TimedLogin=root

TimedLoginDelay=

、删除redhat原有的yum源

# rpm -aq | grep yum|xargs rpm -e --nodeps

、下载新的yum安装包 

　　这里我们使用CentOS的yum源

#wget http://mirror.centos.org/centos/6/os/x86_64/Packages/python-iniparse-0.3.1-2.1.el6.noarch.rpm

#wget http://mirror.centos.org/centos/6/os/x86_64/Packages/yum-metadata-parser-1.1.2-16.el6.x86_64.rpm

# wget http://mirror.centos.org/centos/6/os/x86_64/Packages/yum-3.2.29-40.el6.centos.noarch.rpm

#wget http://mirror.centos.org/centos/6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm

、安装yum软件包

[root@localhost 桌面]# rpm -ivh python-iniparse-0.3.-2.1.el6.noarch.rpm

warning: python-iniparse-0.3.-2.1.el6.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID c105b9de: NOKEY

Preparing...                ########################################### [%]

    package python-iniparse-0.3.-2.1.el6.noarch is already installed

[root@localhost 桌面]# rpm -ivh yum-metadata-parser-1.1.-.el6.x86_64.rpm

warning: yum-metadata-parser-1.1.-.el6.x86_64.rpm: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY

Preparing...                ########################################### [%]

   :yum-metadata-parser    ########################################### [%]

[root@localhost 桌面]# rpm -ivh yum-3.2.-.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.-.el6.noarch.rpm

warning: yum-3.2.-.el6.centos.noarch.rpm: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY

Preparing...                ########################################### [%]

   :yum-plugin-fastestmirro########################################### [ %]

   :yum                    ########################################### [%]

[root@localhost 桌面]# yum update

Loaded plugins: fastestmirror

Setting up Update Process

No Packages marked for Update

　　注意：最后两个安装包要放在一起同时安装，否则会提示相互依赖，安装失败。

wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm

rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt

rpm -K rpmforge-release-0.5.-.el6.rf.x86_64.rpm

rpm -i rpmforge-release-0.5.-.el6.rf.x86_64.rpm 

yum install terminator

Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *                                Linux

Partition  does not end on cylinder boundary.

/dev/sda2                                 Linux

Partition  does not end on cylinder boundary.

/dev/sda3                         +  8e  Linux LVM

This was a bit disconcerting at first, but after a few minutes of thinking it dawned on me that modern systems use LBA (Logical Block Addressing) instead of CHS (Cylinder/Head/Sector) to address disk drives. If we view the partition table using sectors instead of cylinders:

刚开始很让人困惑,但是几分钟之后,我意识到现代操作系统使用LBA而不是CHS来记录硬盘分区.如果用扇区代替柱面,我们将看到:

sfdisk -uS -l /dev/sda

复制代码

Disk /dev/sda:  cylinders,  heads,  sectors/track

Units = sectors of  bytes, counting from 

   Device Boot    Start       End   #sectors  Id  System

/dev/sda1   *                     Linux

/dev/sda2                   Linux

/dev/sda3            8e  Linux LVM

/dev/sda4                      -               Empty

We can see that we end at a specific sector number, and start the next partition at that number plus one. I must say that I have grown quite fond of sfdisk and parted, and they sure make digging through DOS and GPT labels super easy.

我们可以看到,扇区是结束在一个特定的扇区,并且下一个分区的起始扇区在前一个的后面+1扇区.

fdisk -l

fdisk /dev/sda

... 增加物理硬盘并分区，假设新增的分区为/dev/sda3

pvs

pvcreate /dev/sda3

vgs

vgextend VolGroup /dev/sda3

lvs

 lvextend /dev/VolGroup/lv_root /dev/sda3

 resize2fs /dev/VolGroup/lv_root

 df -h

#临时办法

ssh -o PubkeyAuthentication=no root@67.23.163.74

#根本原因是使用ssh key互信的机器数超过了限制
vi /etc/ssh/sshd_config
MaxAuthTries 20 (默认是6)
还有其它更安全的办法，参考：
http://www.lamolabs.org/blog/6259/one-liner-working-around-the-ssh-error-message-too-many-authentication-failures-for-root/

删除0字节文件

find -type f -size  -exec rm -rf {} \;

查看进程，按内存从大到小排列

ps -e   -o "%C   : %p : %z : %a"|sort -k5 -nr

按cpu利用率从大到小排列

ps -e   -o "%C   : %p : %z : %a"|sort   -nr

查看http的并发请求数及其TCP连接状态：

netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'

如何杀掉mysql进程：

ps aux |grep mysql |grep -v grep  |awk'{print $2}' |xargs kill -

显示运行3级别开启的服务:

ls /etc/rc3.d/S* |cut -c -

取IP地址：

ifconfig eth0 |grep "inet addr:" |awk '{print $2}'|cut -c -   或者

ifconfig | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print$1}'

内存的大小:

free -m |grep "Mem" | awk '{print $2}'

统计一下服务器下面所有的jpg的文件的大小

find / -name *.jpg -exec wc -c {} \;|awk '{print $1}'|awk '{a+=$1}END{print a}'

统计代码行数：

find nova/ -name "*.py" | xargs wc -l

占用空间最多的文件或目录：

# du -cks * | sort -rn | head -n 

进程总数

ps aux | wc -l

打开文件数目

lsof | wc -l

清除僵死进程。

ps -eal | awk '{ if ($2 == "Z") {print $4}}' | kill -

匹配中文字符的正则表达式： [\u4e00-\u9fa5]

匹配空白行的正则表达式：\n\s*\r

匹配首尾空白字符的正则表达式：^\s*|\s*$

匹配Email地址的正则表达式：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*

匹配网址URL的正则表达式：[a-zA-z]+://[^\s]*

匹配ip地址：\d+\.\d+\.\d+\.\d+

重复执行命令：

watch -n  -d 'netstat -nat | grep 9696 -c'

watch -n  -d "mysql -uroot -pGalax8800 -e 'show processlist;' | grep quantum | wc -l"

mount -t nfs -o vers=  10.10.10.10:/nfshome /localhome