centos常用配置收集

配置ntp服务器：

# vi /etc/ntp.conf

driftfile /var/lib/ntp/drift
restrict -4 default kod notrap nomodify
restrict -6 default kod notrap nomodify
restrict 127.0.0.1
restrict ::1
server 127.127.1.0
includefile /etc/ntp/crypto/pw
keys /etc/ntp/keys
disable monitor

配置ntp客户端：

# cat /etc/ntp.conf |grep -v '#'|grep -v '^$'

tinker panic 0 stepout 5
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
restrict 127.0.0.1
restrict -6 ::1
server 168.1.21.200 iburst minpoll 3 maxpoll 9
driftfile /var/lib/ntp/drift

配置ssh客户端（centos 6.5）：

# cat /etc/ssh/sshd_config|grep -v '#'|grep -v '^$'

Protocol 2
SyslogFacility AUTHPRIV
PasswordAuthentication yes
ChallengeResponseAuthentication no
GSSAPIAuthentication yes
GSSAPICleanupCredentials yes
UsePAM yes
AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
AcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGE
AcceptEnv XMODIFIERS
X11Forwarding yes
Subsystem sftp /usr/libexec/openssh/sftp-server

获得ID并输出命令：

#!/bin/sh
for i in $(cinder list)
do
    j=$(echo $i|wc -L)
    if [ $j -eq 36 ]; then
        echo "nova volume-attach 2_0 "$i
    fi
done

创建批量对象：

awk 'BEGIN{for(i=0;i<+50;i++) print "cinder create --display-name test7-vol"i" 1"}'

截取变量（从左边0开始，截取长度是5）：

echo ${var:0:5}

配置使用本地DVD作为yum源：

[c6-media]
name=CentOS-$releasever - Media
baseurl=file:///mnt
gpgcheck=1
enabled=1
gpgkey=file:///mnt/RPM-GPG-KEY-CentOS-6