大数据-大数据服务器环境运维常用命令-Centos7（持续更新完善）

大数据-大数据服务器环境运维常用命令-Centos7（持续更新完善） 查看服务器公网ip

curl cip.cc

禁用用透明大页面压缩

sudo echo never > /sys/kernel/mm/transparent_hugepage/defrag
sudo echo never > /sys/kernel/mm/transparent_hugepage/enabled

sudo echo never > /sys/kernel/mm/transparent_hugepage/enabled
sudo echo never > /sys/kernel/mm/transparent_hugepage/defrag

查看CPU信息（型号）

cat /proc/cpuinfo | grep name | cut -f2 -d: | uniq -c

查看物理CPU个数

cat /proc/cpuinfo| grep "physical id"| sort| uniq| wc -l

查看每个物理CPU中core的个数(即核数)

cat /proc/cpuinfo| grep "cpu cores"| uniq

查看逻辑CPU的个数

cat /proc/cpuinfo| grep "processor"| wc -l

查看所有3306端口使用情况

netstat -an | grep 3306

6.2 关闭防火墙和清空规则
    systemctl status firewalld
    systemctl stop firewalld
    systemctl disable firewalld
    iptables -F

重启网卡命令

 systemctl restart network

6.3 selinux关闭

vi /etc/selinux/config 

 This file controls the state of SELinux on the system.
 SELINUX= can take one of these three values:
     enforcing - SELinux security policy is enforced.
     permissive - SELinux prints warnings instead of enforcing.
    disabled - No SELinux policy is loaded.
SELINUX=disabled
 SELINUXTYPE= can take one of three two values:
     targeted - Targeted processes are protected,
     minimum - Modification of targeted policy. only selected processes are protected. 
     mls - Multi Level Security protection.
SELINUXTYPE=targeted