Technical aspects:
1, development ability, this is very important, because the operation and maintenance tools need to be developed by themselves, and the development languages are: c/c++ (one of which is essential), perl, python, php, shell (awk, sed, expect, etc. You need to have practical development experience, otherwise the work will be very painful.
2. Applications need to know: operating system (mainly linux and bsd), webserver related (nginx, apahe, php, lighttpd), database (mysql, oralce), system optimization, clustering and other similar things.
3, network, security, storage and other needs to be quite familiar with.
Personal qualities:
1: Be bold and cautious in your work, and don't take the usual path.
2. Strong logical thinking ability and modesty.
3. Communication skills, teamwork
4. initiative, execution, energy and strong ability to withstand pressure.
5. Have the spirit of exploration and innovation.