Please use CentOS 7 Minimal Install DVD image. See e.g. ftp://ftp.cvut.cz/centos/7.5.1804/isos/x86_64/CentOS-7-x86_64-Minimal-1804.iso.

Set

• Hostname
• IPv4 address, IPv6 ignore
• Timezone
• Disk partitioning: 5 GB for swap (this is needed only in cases of greater utilization)

[root@AIM-4 ~]# fdisk -l
 
Disk /dev/sda: 25.8 GB, 25769803776 bytes, 50331648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000ac63e
 
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200    50298879    24099840   8e  Linux LVM
 
Disk /dev/mapper/centos-root: 19.3 GB, 19327352832 bytes, 37748736 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
 
 
Disk /dev/mapper/centos-swap: 5343 MB, 5343543296 bytes, 10436608 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Base environment

SSH keys

ssh-keygen -t rsa

yum settings and OS update

vi /etc/yum.conf
 
# proxy=http://yourproxy.domain.com:3128 
# http_proxy=http://yourproxy.domain.com:3128 
# https_proxy=http://yourproxy.domain.com:3128 
yum update

Useful utilities

yum install wget mc net-tools

Time synchronization

yum install ntp
# add suitable NTP server
vi /etc/ntp.conf
 
echo '30 * * * * root /usr/sbin/ntpd -q -u ntp:ntp' > /etc/cron.d/ntpd

VMware tools, if needed

yum install open-vm-tools
systemctl start vmtoolsd.service
systemctl enable vmtoolsd.service

Replace firewalld with iptables

yum install iptables-services
vi /etc/sysconfig/iptables
 
# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
%%
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state –state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT%%
-A INPUT -p tcp %%–%%dport 22 -m state %%–%%state NEW -m recent %%–%%set %%–%%name ssh %%–%%rsource
-A INPUT -p tcp %%–%%dport 22 -m state %%–%%state NEW -m recent ! %%–%%rcheck %%–%%seconds 60 %%–%%hitcount 4 %%–%%name ssh %%–%%rsource -j ACCEPT
-A INPUT -p tcp -m state %%–%%state NEW -m tcp %%–%%dport 80 -j ACCEPT
-A INPUT -p tcp -m state %%–%%state NEW -m tcp %%–%%dport 8080 -j ACCEPT
-A INPUT -p tcp -m state %%–%%state NEW -m tcp %%–%%dport 8081 -j ACCEPT
-A INPUT -p tcp -m state %%–%%state NEW -m tcp %%–%%dport 8086 -j ACCEPT
-A INPUT -p tcp -m state %%–%%state NEW -m tcp %%–%%dport 443 -j ACCEPT
-A INPUT -p tcp -m state %%–%%state NEW -m tcp %%–%%dport 61616 -j ACCEPT
-A INPUT -p udp %%–%%match multiport %%–%%dports 8000:8999 -j ACCEPT
-A INPUT -p tcp -m state %%–%%state NEW -m tcp %%–%%dport 161 -j ACCEPT
-A INPUT -p udp -m state %%–%%state NEW -m udp %%–%%dport 161 -j ACCEPT
-A INPUT -j REJECT %%–%%reject-with icmp-host-prohibited
-A FORWARD -j REJECT %%–%%reject-with icmp-host-prohibited
COMMIT
 
Next, execute the folowing: 
systemctl stop firewalld.service
systemctl disable firewalld.service
systemctl enable iptables.service
systemctl start iptables.service

selinux

# TBD
# setsebool -P httpd_can_network_connect on
 
vi /etc/sysconfig/selinux
 
SELINUX=permissive
 
init 6