CentOS Minimal install and configure TIPS

Although various Linux distributions are very similar to the Unix system, there are still many differences. Linux is more interesting. Recently, I need to learn and test, just reinstall CentOS under VirtualBox under OSX platform. 7. Due to the performance of the machine itself, I also personally feel that Minimal installation not only saves resources, but also can better exercise your hands-on ability. Record this installation configuration again.

1. The installation media is CentOS-7-x86_64-DVD-1511.iso (4.3GB.)
2. Choose Minimal to minimize the installation. Does not include KDE/GOME.
3. After the installation is complete, configure the network. First, try ifconfig.. (minimal does not include net-tools). You need to install it yourself. Choose CDROM (ISO) as the installation source.
   Mount the CD image:

# mkdir -p /mnt/cdrom
# mount /dev/cdrom  /mnt/cdrom

2. Set source
   In order to use the CD-ROM image installation source, configure yum.repo:
   Temporarily back up the files in the /etc/yum.repos.d directory, create a new CentOS-Iso.repo, and add the following content:
   # vi CentOS-Iso.repo

[ base]
name=iso
baseurl=file:///mnt/cdrom
gpgcheck=0

3. Install and set up the network
   # yum install net-tools
   The virtual machine sets up NAT and HOST-ONLY two network cards, configures static IP, configuration file:
   # vim /etc/sysconfig/network-scripts/ifcfgX

YPE=Ethernet
BOOTPROTO=static
IPADDR=192.168.56.100
NETMASK=255.255.255.0
NETWORK=192.168.56.0
IPV4_FAILURE_FATAL=no
NAME=enp0s3
UUID=ad60e4e1-c250-47f2-a0d2-fa1fbdbb0bd2
DEVICE=enp0s3
ONBOOT=yes

After configuration, restart the network and test whether the internal and external networks are normal.
# service network restart
4. Turn off the firewall, CentOS 7 does not directly set iptables
# systemctl stop firewalld.service && sudo systemctl disable firewalld.service
5. Install some necessary software such as wget, php, etc. depending on personal needs.
6. Install pip
# wget https://bootstrap.pypa.io/get-pip.py `` # python get-pip.py
7. Set time zone and time
View the current time zone date -R
Modify setting time zone tzselect`` # cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
Or add environment variables in profile (/etc/bashrc)
TZ='Asia/Shanghai'; export TZ
Set time update synchronization
# yum install -y ntpdate`` # ntpdate us.pool.ntp.org
8. Set up admin sudoers
# vim /etc/sudoersadd:

## Allow root to run any commands anywhere
root    ALL=(ALL)       ALL
gwang   ALL=(ALL)       ALL

9. other
   Warning after terminal ssh connection:

- bash: warning: setlocale: LC_CTYPE: cannot change locale(UTF-8): No such file or directory
[ gwang@localhost ~]$ locale
locale: Cannot set LC_CTYPE to default locale: No such file or directory
locale: Cannot set LC_ALL to default locale: No such file or directory
LANG=en_US.UTF-8
LC_CTYPE=UTF-8
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

repair:

sudo vi /etc/environment

LANG=en_US.utf-8
LC_ALL=en_US.utf-8

10. carry on..