Start from the beginning Linux-centos

Test environment, one of the following
Centos-6.5-x86_64-minimal.iso
Centos-7-x86_64-minimal-1511.iso

The first step of system detection and optimization, that is, initialization work,
Regular type of

Rpm-qa|wc-l
IP addr
Ping qq.com
Cat/var/log/boot.log

The following is the c65 shutdown IPv6 and firewall
Centos-6.5-x86_64-minimal.iso
Sed-i ' $a \alias net-pf-10 off \nalias ipv6 off '/etc/modprobe.d/dist.conf
grep ' IPv6 '/etc/modprobe.d/dist.conf
Chkconfig--level 2345 Ip6tables off
Chkconfig--level 2345 iptables off
Chkconfig--list|grep iptables
Service Iptables Stop
Service Ip6tables Stop

Minimal installation is not a firewall service
Centos-7-x86_64-minimal-1511.iso
[Email protected] ~]# cat/etc/redhat-release
CentOS Linux release 7.2.1511 (Core)
[Email protected] grub2]# Vi/etc/default/grub
Will grub_cmdline_linux= "Rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet"
Change to grub_cmdline_linux= "ipv6.disable=1st.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet"
Add ipv6.disable=1, regenerate grub.cfg, and restart the system.
[Email protected] grub2]# Grub2-mkconfig-o/boot/grub2/grub.cfg
Generating GRUB configuration file ...
Found Linux Image:/boot/vmlinuz-3.10.0-327.el7.x86_64
Found initrd Image:/boot/initramfs-3.10.0-327.el7.x86_64.img
Found Linux Image:/boot/vmlinuz-0-rescue-1ace541fd97c40e6a45fd1f7062adae8
Found initrd Image:/boot/initramfs-0-rescue-1ace541fd97c40e6a45fd1f7062adae8.img
Done


Cp/etc/selinux/config./
Sed-i ' s/selinux=enforcing/selinux=disabled/g '/etc/selinux/config
Diff Config/etc/selinux/config
Setenforce 0


The following is the c65 to set, c72 may not need the following.
Sed-i ' s/tty\[1-6\]/tty\[1-2\]/g '/etc/init/start-ttys.conf
Sed-i ' s/tty\[1-6\]/tty\[1-2\]/g '/etc/sysconfig/init
Reboot

The second step is specific to an application and function,
Task-based

1. Install the lxc,c7.2 environment
Yum Install Epel-release
Yum Install LXC
Lxc-checkconfig//Start detection, some items are missing status
RPM-QL Lxc|more
RPM-QL Lxc-libs|more
Yum Install Libcgroup//No dependencies
Yum Install Lxc-templates

Service Cgconfig Start
Service LXC Start
After startup, a lot of directories and files are generated in the/cgroup directory


2. Scan the network segment and log in to a Linux machine to view hardware and system configuration

Yum install--disablerepo=epel Nmap or directly below the
Yum Install Nmap

Nmap 192.168.10.0/24
SSH 192.168.10.45
Lscpu
Cat/proc/cpuinfo
Yum Install Pciutils
Lspci

3. Grab Bag
Yum Install tcpdump

Start from the beginning Linux-centos