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CentOS 下禁 ping

修改内核参数实现

• 临时生效

echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all 

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iptables 白名单

iptables -vL
iptables -A INPUT -p tcp --dport 22 -s 192.168.149.1 -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -s 10.181.242.242 -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -s 10.180.221.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j DROP
service iptables save
service iptables restart

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yum groups remove 'Server with GUI' 报错

yum groupremove 'X Window System' 'GNOME' 'Guest Desktop Agents'

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CentOS 安装完后的需要安装的软件

CentOS 6

yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-6.noarch.rpm -y
yum makecache all
yum update -y
yum install net-tools bind-utils vim nano unzip zip xz wget ftp tmux lrzsz git htop lsof -y

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编译安装 nmon

CentOS 下编译安装

yum install git ncurses-devel ncurses -y
yum groups install 'Development Tools'
cd nmon/
./build.sh

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Linux 下进程相关操作

查看进程号，进程名为 'name'

ps -ef | grep "name" | grep -v grep | awk '{print $2}'

ps -ef | awk '/[n]ame/{print $2}'

ps x | awk '/[n]ame/{print $1}'

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selinux 开启关闭

网上找到的脚本

#!/bin/bash  
#  -------------+--------------------   
# * Filename    :       selinux.sh           
# * Revision    :       2.0             
# * Date        :       2017-09-02

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CentOS 7 安装 iptables

停用 firewalld 服务

systemctl stop firewalld
systemctl disable firewalld
systemctl mask firewalld

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CentOS 6 上编译安装 openssh 7.9p1

准备

yum groupinstall 'Development Tools' -y
yum install wget vim nano mosh -y

下载对应的软件包

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列出当前路径下最占用磁盘空间的前十个文件

du -a | sort -n -r | head -n 10

du - 计算目录的磁盘空间占用的大小，及文件大小 sort - 排序 head - 取出多少行