RPC: Asynchronous system call, webservice is a kind of RPC. webservice is used for system calls that are not in the same company, and the same company uses socket calls. is RPC.
Dubbo Taobao's RPC framework.
Hadoop RPC is the RPC framework that comes with Hadoop.
Alibaba Cloud is a virtual machine. The virtual machine can install linux, unix, and macos systems.
The virtual machine network connection method does not use NAT for bridging. When bridging, you need to change the address of the virtual machine in different places, and NAT does not need to change the virtual machine address.
Linux partitions are not like windows. After partitioning, you can see the disk. After the Linux partition, the folders in / point to different disks. The Boot partition points to a hard disk, and all Linux disks are mounted under the folder. /bin is some executable commands. Windows cmd and dir are commands and program exe files. /boot is something related to booting. /dev is the device hardware. /etc is a configuration file, which is commonly known by convention and can of course be changed.
The configuration in Linux is a text file, and the registry must be changed in Windows.
/home is the user directory, such as my documents in windows. There is a folder with usernames inside. /lib is a library file, and Linux is developed in C language, which contains C language header files and dynamic link libraries. Yum will be downloaded automatically like maven. You don't need maven to find the package and report an error and maven will download it. /media is an external media, the U disk CD-ROM drive is mounted to the media, and the linuc does not have a CD-ROM drive. This disk must be mounted to the file system, or it can be mounted to other places. /usr is the software that different people need to use, and it is installed in this. /sbin is a system management command, similar to bin. The /temp program generates temporary data as it works.
Routers, switches, and bridges are all network devices, and routers are the most powerful. The configuration of IP is determined by the gateway, the router switch is the gateway, the gateway has an IP address, the gateway ip is 192.168.33.1, the IP of the computer is 192.168.33.2-254, 255 is the broadcast address, 0-255 is because it is 8 bits 2 the 8th power. The subnet mask depends on which network segment it belongs to. The network segment 192.168.33.0 is obtained from the operation of the subnet mask and the IP address. Different computers with the same network segment are the same network segment.
DNS is a domain name resolution server. DNS is available in every province. The virtual network card in the virtual machine is a real network card for the Linux system.