NTP | Bots!

Build a Public NTP Server

March 30, 2020 by Rumi

Install NTPd and Configure NTP server for time adjustment.

[root@dlp ~]# yum -y install ntp
[root@dlp ~]# vi /etc/ntp.conf

# line 18: add the network range you allow to receive requests publicly
restrict 0.0.0.0 mask 128.0.0.0 nomodify notrap

# change servers for synchronization

#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 bsti1.time.gov.bd iburst
server bsti2.time.gov.bd iburst

[root@dlp ~]# systemctl start ntpd

[root@dlp ~]# systemctl enable ntpd

If Firewalld is running, allow NTP service. NTP uses 123/UDP.

Installing NTP Service and change timezone in CentOS 6 / CentOS 7

August 30, 2019 by Rumi

Let’s install NTP service first:

yum install ntp

Configure NTP services by updating the following section (only if appropriate):

nano /etc/ntp.conf

And by commenting on the sections:

# 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

In my case I used the following National Time Server of Bangladesh:

server bsti1.time.gov.bd
server bsti2.time.gov.bd

save and restart the ntp service.

Change Timezone on a CentOS 6 and 7

How do I see the current time zone on CentOS Linux?

Type the date command or the ls command:

$ date
$ ls -l /etc/localtime

Another option is to type the following command on systemd based distro such as CentOS 7 to see timezone along with the grep command and timedatectl command:

NTP Adjust date on Linux

December 8, 2013October 27, 2013 by Rumi

If you want to set date/time on linux manually (instead of using synchronization like ntp) you may use the date command to do it.

current date/time.

[root@servername ~]# date

Output will be like Tue Aug 23 12:32:22 EDT 2011

Now to set the desired date/time use the same date command with an argument of your required date/time as following format;