Linux OPS Practice case-December 20, 2015-December 31 (first time)

1 , create a 10G file system, type EXT4, require the boot can be automatically mounted to a separate data/data directory;

(1) Create directory data

# Mkdir/data

Create 20G partitions;

# fdisk/dev/sdb; N p;1; +20g; W

(2) format partition/DEV/SDB1

# mke2fs-t EXT4-L/DEV/SDB1

(3) Edit the/etc/fstab file, the device file/dev/sdb1, mount point/data, file system type EXT4, mount default options, dump frequency, self-Test level write to the configuration file and save

2 , display the ' netstat-tan ' command result with ' LISTEN ' followed by 0, one or more whitespace characters end of the line;

# Netstat-tan | Egrep "listen[[:space:]]*$"

3 , add user Nginx, Zabbix, Tomcat, Nologin, and Hadoop users (nologin user's shell is/sbin/nologin), then find out/etc/ A row in the passwd file that has the same user name as its shell name;

(1) Add User

# useradd nginx# useradd zabbix# useradd tomcat# useradd hadoop# useradd-s/sbin/nologin nologin

(2) find rows that match the criteria

# egrep "^ ([[:alnum:]]+\>). *\1$"/etc/passwd

4 , find a word in the/etc/rc.d/init.d/functions file (the middle of the word can be underlined) followed by a set of parentheses line;

# Cat/etc/rc.d/init.d/functions | Egrep "\<[[:alpha:]"?. *[_]?\>[([)] "

5 , use echo to output a path, and then egrep find its path base name, and further use Egrep to remove its directory name (note that the directory name, not the directory path);

6 , look for all files that do not belong to root, bin, or Hadoop in the/usr directory;

# find/usr-not \ (-user root-o-user bin-o-user hadoop \)-ls

7 , one day the system was invaded, hackers in your system to leave the Trojan file:

You now need to find all the files on the current system that are not owned by the master or group and have been visited in the last week;

In addition, it is necessary to find all files of more than 20k and type ordinary files in/etc directory;

# Find/-nouser-a-nogroup-a-atime-7-ls

# find/etc/-type f-size +20k

8 , Create directory/test/data, let the normal user in a group have write permission to it, and all the files created belong to the group that the directory belongs to, in addition, each user can only delete their own files.

# mkdir-p/test/data# chmod g+w/test/data# chmod g+s/test/data# chmod o+t/test/data

Linux OPS Practice case-December 20, 2015-December 31 (first time)