Active Directory Database - Files

Important files of Active Directory.

Active Directory Database is stored in %systemroot%\NTDS\
the DB file is ntds.dit

The files in this directory, and what they do;
1:ntds.dit : this is the main database file for active directory.
2:edb.log  : When a transaction is performed to AD database, it will be stored to this file, and then after it will be sent to the Database
3:res1.log : Used as a reserved free space, in case of disk low space, default size is 10MB.
4:res2.log : Same of the above.
5:edb.chk  : Records transactions committed to the AD database. During shutdown, "shutdown statement" is written to this file, if it is not found during system startup the AD database checks the edb.log for updated information.

Ntdsutil: tool that can verify database integrity

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Linux - Tools to view disk activity

Here are some tools to find out what process is "eating" your resources:

• iotop
• vmstat
• lsof
• atop
• strace -e trace=open "aplication"

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HAproxy - LoadBalancer - Simple config

I'm testing HAproxy, here is my first simple configuration:
- 1 haproxy server -> Serving 2 backend webservers

Request ---> haproxy:80  ---refered as "webfarm"

                 |          

                / \

            moss1  moss2

Config file: haproxy.cfg

global
        log 127.0.0.1   local0
        log 127.0.0.1   local1 notice
        #log loghost    local0 info
        maxconn 4096
        #nbproc 2
        #chroot /usr/share/haproxy
        user haproxy
        group haproxy
        daemon
        #debug
        #quiet

defaults
        log     global
        mode    http
        option  httplog
        option  dontlognull
        retries 3
        option redispatch
        maxconn 2000
        contimeout      5000
        clitimeout      50000
        srvtimeout      50000

listen  webfarm 0.0.0.0:80
        cookie  SERVERID insert indirect nocache
        balance roundrobin
        server  moss1 10.30.1.61:80 cookie check inter 2000 rise 2 fall 5
        server  moss2 10.30.1.62:80 cookie check inter 2000 rise 2 fall 5

listen admin_stats 0.0.0.0:81
        mode http
        stats uri       /my_stats
        stats realm     Global\ statistics
        stats auth      username:password

        #errorloc       502     http://192.168.114.58/error502.html
        #errorfile      503     /etc/haproxy/errors/503.http
        errorfile       400     /etc/haproxy/errors/400.http
        errorfile       403     /etc/haproxy/errors/403.http
        errorfile       408     /etc/haproxy/errors/408.http
        errorfile       500     /etc/haproxy/errors/500.http
        errorfile       502     /etc/haproxy/errors/502.http
        errorfile       503     /etc/haproxy/errors/503.http
        errorfile       504     /etc/haproxy/errors/504.http

To access haproxy stats:
http://webfarm:81/my_stats

It's working nice, i have to continue tests and try more configuration settings.

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Ubuntu 10.04 - tips - boot in graphic mode

I'm trying Ubuntu (finaly...i wasn't a big fan...but it's growing :)

I installed Lucid Lynx, desktop version, but i'm using it as my second workstation, so i wanted to "tweak it" a little bit.

To boot in text mode, i did some search and found that Ubuntu desktop is configured to work in graphic mode in almost every runlevel

So we can config grub to boot in text mode:

edit /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

add "text"

to the options.

And i also stopped some services:

/etc/rc2.d/

# mv S70bluetooth K70bluetooth

I must confess that the package management of debian based systems is the best (in my humble opinion)

I'm very impressed with "apt-get" ;)

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