Common interview questions for Linux job

common interview questions linux job


linux Operation and maintenance engineers are often asked various questions during the interview , Next, I will arrange the interview questions according to my own experience for your reference .

linux Arrange interview questions linux Arrange interview questions

Take out the file aaa.txt Of the 4 To 7 That's ok
[root@localhost ~]# cat aaa.txt
1.aaa
2.bbbbbbb
3.ccccccccccccc
4.dddddddddddddddddddddd
5.eeeeeeeeeeeeeeeeee
6.ffffffffffffffffffffffffffffffffff
7.gggggggggggggggggggggg
8.hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
9.iiiiiiiiiiiiiiiiiiii
10.jjjjjjjjjjjjjjjjjjjjjjjjjj
11.kkk
12.llllllllll
[root@localhost ~]# sed -n '4,7p' aaa.txt
4.dddddddddddddddddddddd
5.eeeeeeeeeeeeeeeeee
6.ffffffffffffffffffffffffffffffffff
7.gggggggggggggggggggggg
Find the current directory txt Final document
[root@localhost ~]# ls
1.txt 2.txt 3.pdf aaa.txt anaconda-ks.cfg
[root@localhost ~]# find ./ -name "*.txt"
./aaa.txt
./1.txt
./2.txt
lookup /usr More than 1M The file of
[root@localhost ~]# find /usr -type f -size +10240k
/usr/lib/locale/locale-archive
/usr/lib64/libicudata.so.50.1.2
Write a scheduled task 5 Point to 8 Point to perform
* 5-8 * * * /usr/bin/backup
mysql Master slave replication principle

Main library db Update event for (update、insert、delete) Written to binlog.
The master library creates a binlog dump thread, hold binlog Content sent from library .
Start and initiate a connection from the library , Connect to the main library .
After starting from the library , Create a I/O Threads , Read from the main library binlog Content and write to relay log.
After starting from the library , Create a SQL Threads , from relay log Read the contents inside , from Exec_Master_Log_Pos The location starts executing the read update event , Write the update to slave Of db.

vim There are several modes of operation

command Pattern . End of line mode , Edit mode

sketch dns Analytical process ? visit www.baidu.com Analytic flow

Priority to local dns cache , Look for local /etc/hosts file , Whether there is forced parsing , If you don't go /etc/resolv.conf designated dns Search for records in the server ( Networking required , stay dns After finding the resolution record in the server , In the local dns Add cache to , Finish once dns analysis

Explain DNS Two modes of query
recursive query

Recursive query is a kind of DNS The query mode of the server , In this mode DNS The server received a client request , You must reply to the client with an accurate query result . If DNS The server does not store queries locally DNS Information , Then the server will ask other servers , And submit the returned query results to the client .

Iterative query

DNS Another query method of the server is iterative query ,DNS The server will provide other services to the client that can resolve the query request DNS Server address , When the client sends a query request ,DNS The server does not reply directly to the query results , Instead, tell the client another DNS Server address , The client will go to this DNS The server submits the request , Loop back and forth until the result of the query is returned .

Describe forward and reverse proxies
Forward agency

For example, we visit foreign websites at home , No direct access to , We can use a forward proxy server , Request sent to agent service , The proxy server can access foreign websites , In this way, the agent goes to the foreign website to get the returned data , And back to us , So we can visit .

Reverse proxy

Reverse proxy is actually run as a proxy server to accept internet Connection request on , Then forward the request to the server on the internal network , And return the results from the server to the internet Clients requesting connections on , At this time, the client only accesses the proxy server, but does not know how many servers are behind it .

summary

The above is the arrangement of my interview , I hope that's helpful .

版权声明
本文为[Lao Meng's private dishes of Linux]所创,转载请带上原文链接,感谢

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