Centos 7 Minimal Installation 64bit or 32bit

First we must download ISO from source, choose near from you.

1. Update OS,

# yum upgrade

2. Install some tools, so we can check running services

# yum install nano bash-completion net-tools wget curl lsof -y

3. Now I can check it,

# netstat -tulpn ## To output numerical service sockets

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1088/sshd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 2050/master
tcp6 0 0 :::22 :::* LISTEN 1088/sshd
tcp6 0 0 ::1:25 :::* LISTEN 2050/master
udp 0 0 0.0.0.0:62367 0.0.0.0:* 899/dhclient
udp 0 0 0.0.0.0:68 0.0.0.0:* 899/dhclient
udp6 0 0 :::2349 :::* 899/dhclient

# netstat -tulp ## To output literal service sockets

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:ssh 0.0.0.0:* LISTEN 1088/sshd
tcp 0 0 localhost:smtp 0.0.0.0:* LISTEN 2050/master
tcp6 0 0 [::]:ssh [::]:* LISTEN 1088/sshd
tcp6 0 0 localhost:smtp [::]:* LISTEN 2050/master
udp 0 0 0.0.0.0:62367 0.0.0.0:* 899/dhclient
udp 0 0 0.0.0.0:bootpc 0.0.0.0:* 899/dhclient
udp6 0 0 [::]:redstorm_diag [::]:* 899/dhclient

SMTP no need,

# systemctl stop postfix
# yum remove postfix

 

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