cbaWorkflow : Operating system installation

the current selection of Operating System is Centos 7

RHEL7 cannot be selected due to the subscription fees, which can be substantial when dealing with 10 servers.

Centos 8 cannot be selected due to the fact that older RAID cards are not supported and DELL Edge 610 and 710 hard drives are not recognized.

1. Create installation USB flash drive as described in creating bootable usb flash drive

2. Configure the system to boot from the USB flash drive

3. Select the hard drive to install the system to

4. Select Server with GUI , development tools and admin utilities

5. Select the name and network as IPV4 ,manual, set the IP address, Netmask, Gateway and DNS information:

6. Select Timezone:

7. Begin installation , set the root password:

8. accept the license agreement

9. login and disable the firewall, so that remote work is made possible

   systemctl stop firewalld

   systemctl disable firewalld

10. copy the hosts file:

    cd /etc

   scp root@192.168.2.22:/etc/hosts .

11. mount the drives as described in mount the drives

12. set SELINUX to permissive:

#> getenforce

Enforcing

#> setenforce 0

#> getenforce

Permissive

vi /etc/selinux/config

SELINUX=permissive

13. Set up ntpd

 # systemctl status chronyd

 # systemctl stop chronyd

 #  systemctl disable chronyd

 # yum install -y ntp

vi /etc/ntp.conf

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

Verify the Timezone is correct(selected during install)

timedatectl

Start Network Time Protocol Daemon

systemctl start ntpd

systemctl enable ntpd

timedatectl set-ntp true

ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
-dns3.switch.ca 206.108.0.131 2 u 59 64 7 50.467 -7.444 6.033
+dc1-recdns02.be 16.164.40.197 2 u 57 64 7 33.902 0.113 2.439
*ntp3.torix.ca .PTP0. 1 u 55 64 7 14.433 -0.354 2.319
+time.cloudflare 10.14.8.68 3 u 57 64 7 25.310 -1.005 2.538

ntpdate -u 0.centos.pool.ntp.org

[root@namenode1 ~]#hwclock --systohc
[root@namenode1 ~]# timedatectl status

14 Install pdsh

download the lates epel package fromhttps://download-ib01.fedoraproject.org/pub/epel/7/x86_64/Packages/e/

rpm -Uvh epel-release-7-12.noarch.rpm

yum install pdsh