liyang85

# copy from https://www.liquidweb.com/kb/how-to-install-pip-on-centos-7/

# First, we’ll install the EPEL repository
yum install epel-release

# As a matter of best practice we’ll update our packages:
yum -y update
yum -y install python-pip

# Check the version of Pip that is installed:

liyang85

# Part 1: network
cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0.ori
sed -i 's/ONBOOT=no/ONBOOT=yes/; s/BOOTPROTO=dhcp/BOOTPROTO=none/' /etc/sysconfig/network-scripts/ifcfg-eth0
sed -i '$a IPADDR=192.168.6.240\nPREFIX=24\nGATEWAY=192.168.6.1' /etc/sysconfig/network-scripts/ifcfg-eth0
sed -i '$a DNS1=223.5.5.5\nDNS2=119.29.29.29' /etc/sysconfig/network-scripts/ifcfg-eth0
ifdown eth0 && ifup eth0

# If you use a VMware cloned virtual machine, you'll see an error:
# `Device eth0 does not seem to be present, delaying initialization.`, you can change DEVICE name and HWADDR to solve it.
cat /etc/udev/rules.d/70-persistent-net.rules

liyang85

# part 1: installation

yum install epel-release
yum install fail2ban

# part 2: configure local settings
#
# You can find a file with default values called `/etc/fail2ban/jail.conf`. 
# Since this file may be overwritten by package upgrades, we shouldn't edit it in-place. 
# Instead, we'll write a new file called `/etc/fail2ban/jail.local`. 

liyang85

# Part 1: CentOS 6

vim /etc/sysconfig/network
  HOSTNAME=my_hostname
source /etc/sysconfig/network

# `hostname` can set the host name until reboot,
# it also can show the host name
hostname

liyang85

To belabor the obvious: IP addresses are 32 bit values written as four numbers (the individual bytes of the IP address) separated by dots (periods). Each of the four numbers has a valid range of 0 to 255.

The following bash script contains a bash function which returns true if it is passed a valid IP address and false otherwise. In bash speak true means it exits with a zero status, anything else is false. The status of a command/function is stored in the bash variable "$?".

#!/bin/bash

# Test an IP address for validity:
# Usage:
#      valid_ip IP_ADDRESS

liyang85

#!/bin/bash

read name    
while [[ ! "$name" =~ '[A-Za-z ]' ]]; do
    read -p "Wrong name format. Re-enter: " name
done

name="${name// /_}"

read ip

liyang85

# find the target file in the package
rpm2cpio httpd-2.2.15-59.el6.centos.x86_64.rpm | cpio -tv | grep "init.d/httpd"

# view content of the target file then redirect it
rpm2cpio httpd-2.2.15-59.el6.centos.x86_64.rpm | cpio -i --to-stdout ./etc/rc.d/init.d/httpd > /etc/rc.d/init.d/httpd

liyang85

yum -y install ncurses-devel
./configure
make && make install
install -m 644 etc/etcscreenrc /etc/screenrc

liyang85

#!/bin/bash
#
# httpd        Startup script for the Apache HTTP Server
#
# chkconfig: - 85 15
# description: The Apache HTTP Server is an efficient and extensible  \
#	       server implementing the current HTTP standards.
# processname: httpd
# config: /app/httpd22/conf
# config: /etc/sysconfig/httpd

liyang85

#!/bin/bash
# vim: set fdm=marker:
#
#===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====
# Filename:		auto_compile_lamp_by_liyang.sh
# Description:
# Date:			2018-02-14
# Author:		Li Yang
# Website:		https://liyang85.com
#===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====