Server setting | Kashima's Office

After installing CentOS7, small settings are necessary.

NTP client

Install chrony (an NTP client) by yum.

[root@server ~]# yum -y install chrony
Loaded plugins: 
 
(snipped...)
 
Installed:
  chrony.x86_64 0:3.4-1.el7
 
Dependency Installed:
  libseccomp.x86_64 0:2.3.1-4.el7
 
Complete!

Set NTP servers in /etc/chrony.conf

# in /etc/chrony.conf
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst
server (your NTP server) iburst

Enable and start chrony as service

[root@server ~]# systemctl enable chronyd
[root@server ~]# systemctl start chronyd

SELinux

Check the status of SELinux and disable it.

[root@server ~]# getenforce
Enforcing
[root@server ~]# setenforce 0

Disable SELinux by editing /etc/selinux/config permanently.

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
SELINUX=disabled