System Update



Update With The Latest Update

Updating packages

Run the command below and press 'y' at the prompt.  After the update has finished, restart the server.

yum updateConfigure Automatic Updates

Setting Up Automatic Updates

Install yum-cron

Install yum-cron, the package that allows us to do automatic updates

yum -y install yum-cron

Configure yum-cron for auto-update

Edit the file /etc/yum/yum-cron.conf and change the options below

apply_updates = no

to

apply_updates = no

emit_via = stdio

to

emit_via = email

email_to = 

to

email_to = sys admin email address

Verify that the service is running

Very that the service is running with the command

systemctl status yum-cron.service

The output should look similar to

# /bin/systemctl status yum-cron.service

yum-cron.service - Run automatic yum updates as a cron job

 Loaded: loaded (/usr/lib/systemd/system/yum-cron.service; enabled)

 Active: active (exited) since sab 2014-08-09 00:37:16 CEST; 16h ago

 Process: 830 ExecStart=/bin/touch /var/lock/subsys/yum-cron (code=exited, status=0/SUCCESS)

 Main PID: 830 (code=exited, status=0/SUCCESS)

 CGroup: /system.slice/yum-cron.service

If the service is stopped, start it with the following command

systemctl start yum-cron.serviceConfigure Network Time Protocol (NTP)

Install NTP Daemon

Install NTPd with the following command

yum -y install ntp

Configure Firewall

Add NTP service to the 'allow' rules and reload the firewall to apply changes

firewall-cmd --add-service=ntp --permanent

firewall-cmd --reload

Edit ntp.conf File

Change/add the /etc/ntp.conf by removing current time servers and adding new time servers

Change from

# hetzner ntp servers

server ntp1.hetzner.de iburst

server ntp2.hetzner.com iburst

server ntp3.hetzner.net iburst

to

# hetzner ntp servers

# server ntp1.hetzner.de iburst

# server ntp2.hetzner.com iburst

# server ntp3.hetzner.net iburst

Add the following time servers

==============================

server 0.pool.ntp.org

server 1.za.pool.ntp.org

server 2.africa.pool.ntp.org

Start And Check NTP service

Start NTP service and check to see if it is active

Start and enable NTPd

=====================

systemctl start ntpd

systemctl enable ntpd

Check to see if service is enabled

==================================

ntpq -p