cnm / inesc_server

FAQ for the INESC server admin services

INESC Server Commands

Words in italics represent a variable.

Update the server

sudo apt-get update

sudo apt-get upgrade

Add a new user

sudo adduser newusername

When it asks for the user properties:

In room number insert where the user is normally located
In Work phone the phone extension of the room.
In the home phone, his personal mobile.
In the other property, insert the group the user belongs to and who is responsible for him

Then move the home of the user from the default folder to the group folder

sudo mv /home/newusername /home/[cnm|gaips]/

And change it in /etc/passwd:

newusername:x:1000:1000:Some Name,,,:/home/**[cnm|gaips]*/newusername:/bin/bash

Also, create its imap directory structure (TODO this should be in the skel):

maildirmake

Remove a user

sudo userdel oldusername

And to avoid regrets:

sudo mv /home/changethis/oldusername /home/to_delete

(optional) Check if everything is ok at /etc/passwd

Reset a user's password

sudo passwd username

Upon UNIX prompt for a new password, enter a new one
Be sure to confirm by retyping the same new password when prompted again
Send the new password to the user who requested the password reset

Missing memory (RAM) in the server

If the memory reported by free is noticeably different from the sum of ps aux read the slabtool response in this site:

http://stackoverflow.com/questions/5463800/linux-memory-reporting-discrepancy

It is basically being used in the kernel for caching purposes.

Update backports

Add to the repo list:

deb http://backports.debian.org/debian-backports/ squeeze-backports main

Then:

sudo aptitude -t squeeze-backports install "mosh"

sudo apt-get -t squeeze-backports install "mosh"

Create new BD and user

Login to the mysql as root user:

mysql -u root -p

Add user "user1" to database "demo":

mysql> CREATE DATABASE demo;

mysql> GRANT ALL ON demo.* TO user1@localhost IDENTIFIED BY 'mypassword';

Repairing mysql tables

Check if something is broken:

myisamchk /var/lib/mysql/some_database/*.MYI

To repair tables:

myisamchk -r -q /var/lib/mysql/some_database/*.MYI

Check raid status

mdadm --detail /dev/md*

Mailman admin

Managed by:

newlist and rmlist

Old instructions:

comandos newlist e rmlist

devido 'a maquina nao ter ip publico e os nomes gaips e tagus serem cname,

os emails podem chegar @inesc-0.tagus.ist.utl.pt

por isso é necessario acrescentar a nova lista na linha 9 do ficheiro

/etc/exim/conf.d/router/970_local_mailman

depois recriar a configuracao do exim com dpkg-reconfigure exim4-config (e'

automaticamente reiniciado)

o ideal seria a maquina ter ip publico e registos mx

por enquanto nao sera' possivel ter dominios virtuais de email

exim -bt [-d] <endereco de email>

permite testar se o exim consegue entregar o email

If having problem with other domains then tagus.inesc-id.pt:

• In file vim /etc/mailman/mm_cfg.py line 100 add the new host

  POSTFIX_STYLE_VIRTUAL_DOMAINS = [ 'tagus.inesc-id.pt', 'gaips.inesc-id.pt' , 'citysdk.ist.utl.pt']

• Possibly do newaliases comand??? (Please test and correct this doc)

• Restart exim4

• If nothing works, check if DNS MX record is established for new domain

Disable a user

passwd <username> -u

Basically justs prepends a ! to the user password in /etc/passwd

LVM commands

pvdisplay -> checks the physical volumes

vgdisplay -> shows the volume groups

lvdisplay -> show the logical volume

lvextend -l +100%FREE /dev/mapper/vol_group_root-logical-home /dev/md1 -> Fully extends a vol_group

resize2fs /dev/vol_group_root/logical_home -> Expands a partition