Experience in configuring and installing centos on server DELL R710

Introduction

When I wrote this article, I had just installed the system on a DELL R710. Installing the system on the server for the first time. The article will not describe the installation process in detail, there are many online. I will only describe the problems I encountered. In fact, the server is just larger, and the hardware self-test time is longer. Others are no different from ordinary PCs.

There is no way to boot the U disk startup item or the optical drive startup item.

I checked a lot of information at that time. I forgot to modify the boot options. Some old systems default to BIOS boot and must be modified to UEFI boot. Change the settings in the BIOS.
I checked a lot of information at that time and suspected that it might be related to RAID. In fact, it doesn't matter. My server only had one disk, and various configurations were not working well at that time. Maybe our BIOS does not support RAID. Of course, it still needs to be configured if necessary in actual scenarios.

Problems you may encounter when partitioning.

1: Requires allocation of /boot/efi partition. This must be analyzed when doing 64-bit centos. Generally, it should be about the same size as the boot partition.
2: Require GPT partition processing. The prompt is roughly: sda must have GPT label. Processing method:

ctrl+alt+F2

Enter the command line

parted /dev/sda

Enter parted state

mklabel gpt

prompts that all data will be deleted, enter yes

ctrl+alt+F6

Return to the graphical interface, click "Back", and then click "Next" to re-enter the partition interface to partition.
This problem is usually caused by a previous 32-bit operating system. This is caused by running a 64-bit system now.

Configure static IP

There are many specific ways to set a static IP address on the Internet. Note that not only the configuration of the interfaces under /etc/sysconfig/network-scripts/ must be modified, but also the configuration of the /etc/sysconfig/network gateway must be modified.
If the interface is installed. After setting, you will find that the graphical interface always displays device no manager. similar. Because in the centos interface, the network is not only managed by network, but also by NetworkManager. And the two of them are prone to conflict. When using configuration file modification. You can stop /etc/init.d/NetworkManager directly.
Then //etc/init.d/network restart. That's it.
I also encountered a problem at that time, that is, the IP assigned by the administrator could not access the external network, but the automatically obtained IP could. This may be related to network management and needs to be negotiated with the network administrator.

VNC server installation

yum install vnc
yum -y install vnc-server
yum install tigervnc-server tigervnc-server-module

Modify the configuration file after the installation is complete:

vim /etc/sysconfig/vncservers

VNCSERVERS="1:root"
VNCSERVERARGS[2]="-geometry 800x600"

Modify firewall port:

vim /etc/sysconfig/iptables
-A INPUT -m state --state NEW -m tcp -p tcp --dport 5900 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 5901 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 5902 -j ACCEPT
service iptables restart
/etc/init.d/vncserver start
chkconfig vncserver on

Then you can access it through the client VNC viewer.

samba installation

yum install samba samba-client samba-swat

Add samba account command:

smbpasswd –a

Modify vim /etc/samba/smb.conf configuration file

[share]
comment = ***** share dir
path = /home/*******/share
writable = yes
valid users = *******
vim /etc/samba/smbusers

Add ***** = *****The user just added.
Modify the firewall to open ports 139 445. The two ports that samba needs to use.
Restart the firewall and start samba

/etc/init.d/smb start
chkconfig smb on

If windows does not have permission to access the path
Make sure setlinux is closed and execute the :setenforce 0 command

vi /etc/selinux/config

Modify SELINUX=enforcing to SELINUX=disabled

KVM virtual manager installation

Execute the command under administrator privileges:
Shut down the selinux system. (setenforce 0)

yum -y groupinstall "Virtualization" "Virtualization Client" "Virtualization Platform" "Virtualization Tools"
yum -y install bridge-utils
yum install libvirt
#sudo apt-get install kvm qemu
service libvirtd start

You can see it by running lsmod | grep kvm

Kvm
kvm_intel

Load kvm kernel module: modprobe kvm

Using Intel CPU: Load Intel kernel module: modprobe kvm-intel
If the following error message is returned when you load the module, it means that VT may be turned off in the BIOS:

FATAL: Error inserting kvm_intel (/lib/modules/2.6.20-15-generic/kernel/drivers/kvm/kvm-intel.ko): Operation not supported

Just open it in BIOS.
Using AMD CPU:

modprobe kvm-amd

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