12个Linux系统高频率命令行和shell小脚本

45yt

以下是在部署OpenStack过程中摘录的一些较为常用的命令行或shell脚本，仅供参考。
1.杀死所有存在的僵尸进程

1 2	ps -ef | grep defunc | grep -v grep | awk '{print $3}' | xargs kill -9 #pkill dnsmasq

2.去掉配置文件中的#符号和空白行

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cat >/root/delsc.sh <<eof #!/bin/bash # delete all spaces and comments of specialized file, using with  filename [[ "\$1" == '' ]] && echo "delete all spaces and comments of specialized file, using with \$@ filename" && exit 1 grep -v \# \$1 | grep -v ^$ eof cat /root/delsc.sh chmod +x /root/delsc.sh ln -s /root/delsc.sh /usr/local/bin/delsc

3.CentOS7安装vmtools

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# mount /dev/cdrom /mnt/ # cp /mnt/VMwareTools-9.4.10-2092844.tar.gz /tmp/ # cd /tmp/ # tar zxf VMwareTools-9.4.10-2092844.tar.gz # /tmp/vmware-tools-distrib/vmware-install.pl yum install open-vm-tools -y systemctl enable vmtoolsd.service systemctl start vmtoolsd.service systemctl status vmtoolsd.service

4.修改Linux系统时区

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mv /etc/localtime /etc/localtime~ ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime chown -h --reference=/etc/localtime~ /etc/localtime chcon -h --reference=/etc/localtime~ /etc/localtime

5.中国大陆常用时间服务器列表

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cat > /etc/ntp.conf <<eof server 2.cn.pool.ntp.org iburst server 3.asia.pool.ntp.org iburst server 0.asia.pool.ntp.org iburst restrict -4 default kod notrap nomodify restrict -6 default kod notrap nomodify eof

6.配置时间同步

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rpm -qa | grep ntp || yum install -y ntp ntpdate -u pool.ntp.org || ntpdate -u time.nist.gov || ntpdate -u time-nw.nist.gov date cat >>/etc/rc.local<<EOF ntpdate -u pool.ntp.org || ntpdate -u time.nist.gov || ntpdate -u time-nw.nist.gov hwclock -w EOF # Recommoned do touch /etc/cron.daily/ntpdate cat >>/etc/cron.daily/ntpdate<<EOF ntpdate -u pool.ntp.org || ntpdate -u time.nist.gov || ntpdate -u time-nw.nist.gov hwclock -w EOF

7.对配置文件更改前先备份配置文件

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operationfile=/etc/keystone/keystone.conf bakoperationfile=$operationfile$(date +-%F-%H-%M-%S)"~" cp $operationfile $bakoperationfile chown -R --reference=$operationfile $bakoperationfile chcon -R --reference=$operationfile $bakoperationfile

8.创建计划任务

1	(crontab -l -u keystone 2>&1 | grep -q token_flush) || echo '@hourly /usr/bin/keystone-manage token_flush >/var/log/keystone/keystone-tokenflush.log 2>&1' >> /var/spool/cron/keystone

9.不切换用户但以此用户的身份执行命令

1	su -s /bin/sh -c "glance-manage db_sync" glance

10.获取路由IP

1	ip=$(ifconfig `route | grep default | awk '{print $8}'` | grep inet | grep -v inet6 | awk '{print $2}')

11.判断CPU是否支持虚拟化

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if [[ $(egrep -c '(vmx|svm)' /proc/cpuinfo) == 0 ]];then     defaultnum=`grep -n "^\[libvirt\]$" $operationfile | awk -F ':' '{print $1}'`     sedoperation=$defaultnum"a"     sed -i "$sedoperation  virt_type = qemu" $operationfile else     defaultnum=`grep -n "^\[libvirt\]$" $operationfile | awk -F ':' '{print $1}'`     sedoperation=$defaultnum"a"     sed -i "$sedoperation  virt_type = kvm" $operationfile fi

12.获取指定网卡名所对应的IP地址

1 2	ext_ens=ens160 local_ip=$(ifconfig `route | grep $ext_ens | awk '{print $8}'` | grep inet | grep -v inet6 | awk '{print $2}')

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