Users and groups on the Linux
Hi all, today I want to take some timeout from Openstack and explain a little bit about managing linux groups and users.
Agenda:
- Group management (groupaadd, groupdel)
- User management (useradd, userdel, usermod)
- How to assign password to user (passwd)
- How to force user to change password on next login
Group management:
1. create new group: # groupadd new-1
2. check created group under /etc/group
output is:
new-1:x:1001:
| |
name id
3. delete group: # groupdel new-1
User managment:
1. Add new user: # useradd -u 2000 -g 1001 user1 -d /home/user1 -s /bin/bash
| | | | |
uid primary new home shell
group id name directory
2. For checking new user see /etc/passwd
output is:
user:x:2000:1001::/home/user:/bin/bash
| | | | |
name user group home shell
id id directory
Exist few types of groups:
1. Primary - default user group where user will create files etc.
2. Secondary - you can add any group, so user will have any access from these groups
3. For modification user use: # usermod -u 2001 user1 etc...
or for adding additional (secondary groups use) # usermod -G www,ftp user1
4. For removing user use # userdel -r user1 (-r remove home directory)
5. Exist option lock/unlock user, locked user cant login:
# usermod -L user1 - locked
# usermod -U user1 - unlocked
How to assign password to user (passwd):
There are 2 ways:
1. # passwd user
2. If you want see pass you typed, use: # echo 'password' | passwd --stdin user
How to force user to change password on next login
1. #chage -d 0 user - changing password in the next login
2. # chage -M 10 user - changing password each 10 days
3. # chage -l user - all information about user password
or
/etc/shadow
Hi all, today I want to take some timeout from Openstack and explain a little bit about managing linux groups and users.
Agenda:
- Group management (groupaadd, groupdel)
- User management (useradd, userdel, usermod)
- How to assign password to user (passwd)
- How to force user to change password on next login
Group management:
1. create new group: # groupadd new-1
2. check created group under /etc/group
output is:
new-1:x:1001:
| |
name id
3. delete group: # groupdel new-1
User managment:
1. Add new user: # useradd -u 2000 -g 1001 user1 -d /home/user1 -s /bin/bash
| | | | |
uid primary new home shell
group id name directory
2. For checking new user see /etc/passwd
output is:
user:x:2000:1001::/home/user:/bin/bash
| | | | |
name user group home shell
id id directory
Exist few types of groups:
1. Primary - default user group where user will create files etc.
2. Secondary - you can add any group, so user will have any access from these groups
3. For modification user use: # usermod -u 2001 user1 etc...
or for adding additional (secondary groups use) # usermod -G www,ftp user1
4. For removing user use # userdel -r user1 (-r remove home directory)
5. Exist option lock/unlock user, locked user cant login:
# usermod -L user1 - locked
# usermod -U user1 - unlocked
How to assign password to user (passwd):
There are 2 ways:
1. # passwd user
2. If you want see pass you typed, use: # echo 'password' | passwd --stdin user
How to force user to change password on next login
1. #chage -d 0 user - changing password in the next login
2. # chage -M 10 user - changing password each 10 days
3. # chage -l user - all information about user password
or
/etc/shadow
