Open the windon system in meditation system: first enter ps -ef |grep vsftpd to see if there is FTP service. If this figure appears, it means that it is not installed. Install vsftpd service: yum install vsftpd -y, and install vsftpd online. After successful installation, you need to modify the configuration file.

The main products are Deep Linux(Deepin), Red Flag Linux(RedflagLinux), NeoKylin (Neo Kylin), StartOS, Ningsiyan Security Operating System, * * Chuanglinux, Sipu Operating System, Zhongke Fangde Desktop Operating System and ZTE New Pivot Operating System.

High availability:

Ning Siyan's security service platform V2.4 software has been tested for a long time before release, which can ensure stable operation in the environment with high memory and high CPU load, and provide a stable running platform for various applications. In order to further improve the stability of the operating system, the software V2.4 of Ningsiyan security service platform also provides a variety of redundant fault-tolerant mechanisms to reduce the failure of the whole machine caused by component failure.

Disk redundancy technology: provide soft RAID technology to reduce the system risk caused by disk failure through disk redundancy. Support online reconstruction, reduce system recovery time and improve system stability.

Network card redundancy technology: provide network card load balancing and redundant backup. When two network cards and their links are normal, it can provide network card load balancing function and improve network transmission efficiency; When the network card or its link fails. The other network card can still provide services, which improves the overall reliability of the network.