Linux operation and maintenance plane question

Linux operation and maintenance plane question

1) What is the general process of Linux booting?

*bios Self-Test

* The first process init (LILO and GRUB mode) running the system kernel and detecting the hardware booting from the hard disk and running the system

*init reads the system boot profile/etc/inittab and configures the service according to the run level/etc/rc.d/rc.local

2) The server already has the user and the group is Nginx, now wants to put in the home directory app.conf the file belongs to the main group is the Nginx command is

3) Please describe the principle of DNS query in detail

4) What are the monitoring software commonly used at present? What do you use most, and what is the specific deployment?

5) Add a rule with iptables to allow 192.168.0.123 to access the native 3306 port

6) Write a shell script that automatically deletes files with a. tmp end of the system with a capacity greater than 500M per Sunday 23:35

7) crontab in November, every day in the morning 6 to 12, every 2 hours to perform/usr/bin/httpd.sh how to achieve?

8) Vim commonly used shortcut keys: How to copy a line and then print out, move the beginning of the file, move to the last line of the file, delete the whole line, in the file to find the test, all appear old to replace the new

9) What is commonly used in Linux DNS service software, cite the central common DNS records, if the domain name is abc.com configured a mail server, the IP address is 183.7.0.20, how to do parsing. Whether to understand the intelligent parsing of bind, if you understand, please explain its principle

MySQL database master-slave replication principle, often contact database sub-list tools, how to divide?

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Linux operation and maintenance plane question