Shulou(Shulou.com)06/02 Report--

Linux is a bit of a big change,centos 6.5 6 red 6 6.5 and so on are slightly different from centos 7 red7, command configuration files are slightly different

Here's a brief description of the difference.

centos7

keroros cross-platform trust mechanism is more compatible with windows active directory

Realmd can automatically discover windows domains without setting up many configuration documents

You can add AD DNS information yourself, which is very convenient.

Graphics are more powerful, and assistance is more powerful

Virtual I/O calls to underlying hardware more efficiently, support USB 3.0, nested virtualization technology, enhanced VMWARE support

Support for the hottest technology Docker!!!!

The difference between installation is that basically all configurations are set up on one page.

vim <$/anaconda-ks. cfg has its own installation details, configuration, etc.

In the new version the init change level has been changed to systemctl~ but... init can still be used ~~~ so it feels like there is nothing to use ah

ln -sf /lib/systemd/system/default.target Default level changed to 3 text multi-user.target

ln -sf /lib/systemd/system/default.target convert graphics mode ~ graphical.target

systemctl set-default multi-user.target This can also be...

Switch operation level during startup

systemctl isolate multi-user.target Text runlevel3.target Text graphical.target Graphics runlevel5.target Graphics

Modify default startup resolution

vim /boot/grub2/grub.cfg

linux16 /vmlinuz-*** ending with vga=0x??

Sign in automatically!!!

vim /etc/gdm/custom.conf

daemon

AutomaticLoginEnable=true

AutomaticLogin=root

Automatic login root

Change Host Name ~~~~

vim /etc/hostname Simple!!!

hostnamectl set-hostname command changed to simple ~

nmtui graphics!!!

The network configuration related changes are relatively large, and the former eth naming method has been modified.

The requested URL/etc/sysconfig/grub/was not found on this server.

grub2-mkconfig -o /boot/grub2/grub.cfg

execute this command

The requested URL/etc/sysconfig/network-scripts/was not found on this server.

reboot After restarting the computer, check the network card and modify it back to the original one

systemctl integrates the two functions of service chkconfig, which is more convenient

changed the init.d service storage location,

/usr/lib/systemd/sysetm or/etc/systemd/system

The new service startup script has also been changed into three blocks, no longer using the original color service shell

[Unit] is mainly a description of this service, including Description and After, Description is used to describe the service, After is used to separate the relationship, after what service to start, etc.

[Service] is the key to the service and the setting of some specific operation parameters of the service. Here Type=forking is the form of background operation, PIDFile is the file path to store PID, ExecStart is the specific operation command of the service, ExecReload is the overloaded command, and ExecStop is the stop command. Note: The start, restart, and stop commands in [Service] all require absolute paths, and errors will be reported if relative paths are used!

The [Install] section is about settings for service installation, which can be set to multi-user.

Note: If services do not have Install paragraphs, this generally means that they should be automatically invoked by other services

When using systemd, dependencies can be resolved by writing the cell configuration file correctly. Typically, service A requires service B to run before service A starts. In this case, add Requires=B and After=B to the [Unit] section of the Service A profile

The new service mechanism enhances the description of service dependencies, increases the speed of parallel service startup, and improves startup efficiency.

systemctl commands are systemctl [actions,start stop restart, etc.] service names

The action can also be enable, disable, disable, etc.

The firewall defaults to firewalld!!!!!!!!!!!!!!!!!!!

this concludes

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