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<channel>
	<title>Amar&#039;s Blog</title>
	<atom:link href="http://amar.ba/feed/" rel="self" type="application/rss+xml" />
	<link>http://amar.ba</link>
	<description></description>
	<lastBuildDate>Sun, 04 Dec 2011 16:49:18 +0000</lastBuildDate>
	<language>en</language>
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		<title>tomld &#8211; Tomoyo u dva poteza</title>
		<link>http://amar.ba/tomld_tomoyo_u_dva_poteza/</link>
		<comments>http://amar.ba/tomld_tomoyo_u_dva_poteza/#comments</comments>
		<pubDate>Sun, 04 Dec 2011 16:41:23 +0000</pubDate>
		<dc:creator>amar</dc:creator>
				<category><![CDATA[dummy kategorija]]></category>

		<guid isPermaLink="false">http://amar.ba/?p=68</guid>
		<description><![CDATA[Tomoyo? Tomoyo je  pathname MAC (mandatory access control) za Linux cija je svrha povecanje sigurnosti Linux sistema. Ideja je jednostavna: Tomoyu kazete &#8220;sta je OK&#8221; (learning) a Tomoyo ce zatim sve &#8220;sto nije OK&#8221; u komunikaciji sa Linux kernelom blokirati. Ako mu kazemo da je OK da user amar ima read/write permisije na /var/www/vhosts/amar/www direktorij, [...]]]></description>
			<content:encoded><![CDATA[<h3>Tomoyo?</h3>
<p>Tomoyo je  pathname MAC (mandatory access control) za Linux cija je svrha povecanje sigurnosti Linux sistema. Ideja je jednostavna: Tomoyu kazete &#8220;sta je OK&#8221; (learning) a Tomoyo ce zatim sve &#8220;sto nije OK&#8221; u komunikaciji sa Linux kernelom blokirati. Ako mu kazemo da je OK da user <span style="color: #666699;">amar</span> ima read/write permisije na <span style="color: #666699;">/var/www/vhosts/amar/www</span> direktorij, a korisnik <span style="color: #666699;">amar</span> nakon learning perioda (enforcing) pokusa pisati u <span style="color: #666699;">/var/www/vhosts/amar/www2</span> kernel mu to nece dozvoliti.</p>
<p>&nbsp;</p>
<h3>tomld?</h3>
<p>Pisanje Tomoyo pravila se moze nazvati &#8220;bolnim&#8221;. Nije bas sve tako jednostavno i lako za zavrsiti a uvijek postoji sansa za gresku. tomld taj proces pojednostavljuje. Radi kao deamon i gleda na sve trenutno pokrenute procese u learning mode-u te sam pokusava da skonta koja pravila napisati i staviti ih u enforcing mode. Naravno i ovdje postoji mogucnost greske ali komandom <span style="color: #666699;">tomld &#8211;learn</span> cemo deamon-u reci da, iako je u enforcing mode-u, na 1h sve denied domene ponovo stavi u learning mode.</p>
<p>Iako na prvu zvuci i previse komplikovano,tomld to zaista nije a MAC je nesto sto svakom shared hosting serveru itekako treba.. osim ako se ne odlucite ici Gentoo Hardened putem : )</p>
<p>&nbsp;</p>
<p><a href="http://tomoyo.sourceforge.jp/" target="_blank">Tomoyo</a></p>
<p><a href="http://log69.com/tomld_en.html" target="_blank">tomld</a></p>
]]></content:encoded>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>ferm &#8211; iptables na pravi nacin</title>
		<link>http://amar.ba/ferm_iptables_na_pravi_nacin/</link>
		<comments>http://amar.ba/ferm_iptables_na_pravi_nacin/#comments</comments>
		<pubDate>Tue, 08 Nov 2011 15:50:11 +0000</pubDate>
		<dc:creator>amar</dc:creator>
				<category><![CDATA[dummy kategorija]]></category>

		<guid isPermaLink="false">http://amar.ba/?p=55</guid>
		<description><![CDATA[Postoji stotine,hiljade iptables firewall skripti koje se trude olaksati zivot administratoru smrtniku. Nekima je lakse i nakucati sve rucno. Ja sam dugo vremena imao nakucanu skriptu koja je radila ono sto i vecina firewall-a na Web server setupima radi. Dozvoli 80,443.. i blokiraj ostalo. I to radi OK. Onog trenutka kad sam pronasao ferm osjecao [...]]]></description>
			<content:encoded><![CDATA[<p><span id="more-55"></span>Postoji stotine,hiljade iptables firewall skripti koje se trude olaksati zivot administratoru smrtniku. Nekima je lakse i nakucati sve <a href="http://www.frozentux.net/iptables-tutorial/iptables-tutorial.html" target="_blank">rucno</a>. Ja sam dugo vremena imao nakucanu skriptu koja je radila ono sto i vecina firewall-a na Web server setupima radi. Dozvoli 80,443.. i blokiraj ostalo. I to radi OK.</p>
<p>Onog trenutka kad sam pronasao <a href="http://ferm.foo-projects.org/" target="_blank">ferm</a> osjecao sam se kao oni vim i emacs vjernici koji se poslije Boga kletu u editor. Jednostavno je mocan,jednostavan i funkcionalan.</p>
<p>Za neki prosjecan Web setup ferm.conf  bi izgledao otprilike ovako (kako instalirati ferm na omiljeni distro zna Google):</p>
<div class="codecolorer-container bash railscasts" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;height:450px;"><div class="bash codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap"><span style="color: #666666; font-style: italic;">#trusted mreze</span><br />
<span style="color: #000000; font-weight: bold;">@</span>def <span style="color: #007800;">$NET_TRUSTED</span> = <span style="color: #7a0874; font-weight: bold;">&#40;</span><span style="color: #000000;">77.239</span>.xxx.xxx <span style="color: #000000;">77.74</span>.xxx.xxx<span style="color: #7a0874; font-weight: bold;">&#41;</span>;<br />
<br />
table filter <span style="color: #7a0874; font-weight: bold;">&#123;</span><br />
chain INPUT <span style="color: #7a0874; font-weight: bold;">&#123;</span><br />
policy DROP;<br />
<br />
<span style="color: #666666; font-style: italic;">#tracking</span><br />
mod state state INVALID DROP;<br />
mod state state <span style="color: #7a0874; font-weight: bold;">&#40;</span>ESTABLISHED RELATED<span style="color: #7a0874; font-weight: bold;">&#41;</span> ACCEPT;<br />
<br />
<span style="color: #666666; font-style: italic;">#dozvoli lokalne konekcije</span><br />
interface lo ACCEPT;<br />
<br />
<span style="color: #666666; font-style: italic;">#dozvoli ping</span><br />
proto icmp icmp-type echo-request ACCEPT;<br />
<br />
<span style="color: #666666; font-style: italic;">#dozvoli SSH sa trusted mreza</span><br />
saddr <span style="color: #007800;">$NET_TRUSTED</span> proto tcp dport <span style="color: #c20cb9; font-weight: bold;">ssh</span> ACCEPT;<br />
<br />
<span style="color: #666666; font-style: italic;">#dozvoli SMTP</span><br />
proto tcp dport <span style="color: #7a0874; font-weight: bold;">&#40;</span>smtp<span style="color: #7a0874; font-weight: bold;">&#41;</span> ACCEPT;<br />
<br />
<span style="color: #666666; font-style: italic;"># dozvoli http i https</span><br />
proto tcp dport <span style="color: #7a0874; font-weight: bold;">&#40;</span>http https<span style="color: #7a0874; font-weight: bold;">&#41;</span> <span style="color: #7a0874; font-weight: bold;">&#123;</span><br />
<span style="color: #666666; font-style: italic;">#dozvoli max 20 konekcija po IP adresi</span><br />
mod connlimit connlimit-above <span style="color: #000000;">20</span> REJECT;<br />
ACCEPT;<br />
<span style="color: #7a0874; font-weight: bold;">&#125;</span><br />
<br />
<span style="color: #666666; font-style: italic;">#dozvoli FTP</span><br />
proto tcp dport <span style="color: #7a0874; font-weight: bold;">&#40;</span><span style="color: #c20cb9; font-weight: bold;">ftp</span><span style="color: #7a0874; font-weight: bold;">&#41;</span> <span style="color: #7a0874; font-weight: bold;">&#123;</span><br />
<span style="color: #666666; font-style: italic;">#dozvoli max 5 konekcija po IP adresi</span><br />
mod connlimit connlimit-above <span style="color: #000000;">5</span> REJECT;<br />
ACCEPT; <span style="color: #7a0874; font-weight: bold;">&#125;</span><br />
<br />
<span style="color: #666666; font-style: italic;">#dozvoli DNS TCP</span><br />
proto tcp dport <span style="color: #7a0874; font-weight: bold;">&#40;</span>domain<span style="color: #7a0874; font-weight: bold;">&#41;</span> ACCEPT;<br />
<span style="color: #666666; font-style: italic;">#dozvoli DNS udp</span><br />
proto udp dport domain ACCEPT;<br />
<br />
<span style="color: #666666; font-style: italic;"># the rest is dropped by the above policy</span><br />
<br />
<span style="color: #666666; font-style: italic;">#temp junk</span><br />
saddr 201.140.107.253 proto tcp DROP;<br />
<span style="color: #7a0874; font-weight: bold;">&#125;</span><br />
<br />
<span style="color: #666666; font-style: italic;"># outgoing connections are not limited</span><br />
chain OUTPUT policy ACCEPT;<br />
<br />
<span style="color: #666666; font-style: italic;"># this is not a router</span><br />
chain FORWARD policy DROP;<br />
<span style="color: #7a0874; font-weight: bold;">&#125;</span></div></div>
<p>&nbsp;</p>
<p>You see? Prelijepo.. nesto sto se mora probati ukoliko se ima potrebe za firewall-om/iptables-om.</p>
<p>&nbsp;</p>
<p><a href="http://ferm.foo-projects.org" target="_blank">Ferm</a></p>
<p><a href="http://ferm.foo-projects.org/download/2.1/ferm.html" target="_blank">Ferm manual</a></p>
]]></content:encoded>
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		</item>
		<item>
		<title>monit &#8211; monitoring za velike</title>
		<link>http://amar.ba/monit_monitoring_za_velike/</link>
		<comments>http://amar.ba/monit_monitoring_za_velike/#comments</comments>
		<pubDate>Mon, 07 Nov 2011 21:35:13 +0000</pubDate>
		<dc:creator>amar</dc:creator>
				<category><![CDATA[dummy kategorija]]></category>

		<guid isPermaLink="false">http://amar.ba/?p=29</guid>
		<description><![CDATA[Kad imate vise servera o kojima se brinete, cesto se desi da servisi na istima iz nekih razloga odu u nirvana state a da to niste ni primjetili. Nekad zbog pogresne konfiguracije servisi se i ne startaju, nekad child procesi servisa pojedu sve resurse.. jednostavno ne sluze ono sto bi trebali. Zasto Monit? Nagios je [...]]]></description>
			<content:encoded><![CDATA[<p><span id="more-29"></span>Kad imate vise servera o kojima se brinete, cesto se desi da servisi na istima iz nekih razloga odu u <em>nirvana state</em> a da to niste ni primjetili. Nekad zbog pogresne konfiguracije servisi se i ne startaju, nekad child procesi servisa <em>pojedu</em> sve resurse.. jednostavno ne sluze ono sto bi trebali.</p>
<h3>Zasto Monit?</h3>
<p>Nagios je sigurno najpoznatiji i najkoristeniji monitoring servis out there, ali isto tako ne bas lagan za konfigurisati.</p>
<p>Ideja je jednostavna: ukoliko se desi $x posalji mi mail na $y i restartuj servis sa komandom $z</p>
<p>Za neki standardni LAMPP setup  monitrc bi to otprilike izgledao ovako (kako instalirati monit na omiljeni distro  reci ce vam Google):</p>
<div class="codecolorer-container bash railscasts" style="overflow:auto;white-space:nowrap;border:1px solid #9F9F9F;width:435px;height:450px;"><div class="bash codecolorer" style="padding:5px;font:normal 12px/1.4em Monaco, Lucida Console, monospace;white-space:nowrap"><span style="color: #000000; font-weight: bold;">set</span> daemon <span style="color: #000000;">60</span><br />
<span style="color: #000000; font-weight: bold;">set</span> logfile syslog facility log_daemon<br />
<span style="color: #000000; font-weight: bold;">set</span> mailserver localhost<br />
<span style="color: #000000; font-weight: bold;">set</span> mail-format <span style="color: #7a0874; font-weight: bold;">&#123;</span> from: monit<span style="color: #000000; font-weight: bold;">@</span>nula.ba<br />
subject: <span style="color: #007800;">$SERVICE</span> <span style="color: #007800;">$EVENT</span> at <span style="color: #007800;">$DATE</span><br />
message: Monit <span style="color: #007800;">$ACTION</span> <span style="color: #007800;">$SERVICE</span> at <span style="color: #007800;">$DATE</span> on <span style="color: #007800;">$HOST</span>: <span style="color: #007800;">$DESCRIPTION</span> <span style="color: #7a0874; font-weight: bold;">&#125;</span><br />
<span style="color: #000000; font-weight: bold;">set</span> alert amar.cosic<span style="color: #000000; font-weight: bold;">@</span>gmail.com<br />
<br />
check process sshd with pidfile <span style="color: #000000; font-weight: bold;">/</span>var<span style="color: #000000; font-weight: bold;">/</span>run<span style="color: #000000; font-weight: bold;">/</span>sshd.pid<br />
start program <span style="color: #ff0000;">&quot;/etc/init.d/ssh start&quot;</span><br />
stop program <span style="color: #ff0000;">&quot;/etc/init.d/ssh stop&quot;</span><br />
<span style="color: #000000; font-weight: bold;">if</span> failed port <span style="color: #000000;">22</span> protocol <span style="color: #c20cb9; font-weight: bold;">ssh</span> <span style="color: #000000; font-weight: bold;">then</span> restart<br />
<span style="color: #000000; font-weight: bold;">if</span> <span style="color: #000000;">5</span> restarts within <span style="color: #000000;">5</span> cycles <span style="color: #000000; font-weight: bold;">then</span> timeout<br />
<br />
check process mysql with pidfile <span style="color: #000000; font-weight: bold;">/</span>var<span style="color: #000000; font-weight: bold;">/</span>run<span style="color: #000000; font-weight: bold;">/</span>mysqld<span style="color: #000000; font-weight: bold;">/</span>mysqld.pid<br />
group database<br />
start program = <span style="color: #ff0000;">&quot;/etc/init.d/mysql start&quot;</span><br />
stop program = <span style="color: #ff0000;">&quot;/etc/init.d/mysql stop&quot;</span><br />
<span style="color: #000000; font-weight: bold;">if</span> mem usage <span style="color: #000000; font-weight: bold;">&amp;</span>gt; <span style="color: #000000;">80</span><span style="color: #000000; font-weight: bold;">%</span> <span style="color: #000000; font-weight: bold;">for</span> <span style="color: #000000;">5</span> cycles <span style="color: #000000; font-weight: bold;">then</span> alert<br />
<span style="color: #000000; font-weight: bold;">if</span> cpu usage <span style="color: #000000; font-weight: bold;">&amp;</span>gt; <span style="color: #000000;">80</span><span style="color: #000000; font-weight: bold;">%</span> <span style="color: #000000; font-weight: bold;">for</span> <span style="color: #000000;">5</span> cycles <span style="color: #000000; font-weight: bold;">then</span> alert<br />
<span style="color: #000000; font-weight: bold;">if</span> failed host 127.0.0.1 port <span style="color: #000000;">3306</span> <span style="color: #000000; font-weight: bold;">then</span> restart<br />
<span style="color: #000000; font-weight: bold;">if</span> <span style="color: #000000;">5</span> restarts within <span style="color: #000000;">5</span> cycles <span style="color: #000000; font-weight: bold;">then</span> timeout<br />
<br />
check process apache with pidfile <span style="color: #000000; font-weight: bold;">/</span>var<span style="color: #000000; font-weight: bold;">/</span>run<span style="color: #000000; font-weight: bold;">/</span>apache2.pid<br />
group www<br />
start program = <span style="color: #ff0000;">&quot;/etc/init.d/apache2 start&quot;</span><br />
stop program = <span style="color: #ff0000;">&quot;/etc/init.d/apache2 stop&quot;</span><br />
<span style="color: #000000; font-weight: bold;">if</span> cpu is greater than <span style="color: #000000;">60</span><span style="color: #000000; font-weight: bold;">%</span> <span style="color: #000000; font-weight: bold;">for</span> <span style="color: #000000;">2</span> cycles <span style="color: #000000; font-weight: bold;">then</span> alert<br />
<span style="color: #000000; font-weight: bold;">if</span> cpu <span style="color: #000000; font-weight: bold;">&amp;</span>gt; <span style="color: #000000;">80</span><span style="color: #000000; font-weight: bold;">%</span> <span style="color: #000000; font-weight: bold;">for</span> <span style="color: #000000;">5</span> cycles <span style="color: #000000; font-weight: bold;">then</span> restart<br />
<span style="color: #000000; font-weight: bold;">if</span> totalmem <span style="color: #000000; font-weight: bold;">&amp;</span>gt; <span style="color: #000000;">500</span> MB <span style="color: #000000; font-weight: bold;">for</span> <span style="color: #000000;">5</span> cycles <span style="color: #000000; font-weight: bold;">then</span> restart<br />
<span style="color: #000000; font-weight: bold;">if</span> children <span style="color: #000000; font-weight: bold;">&amp;</span>gt; <span style="color: #000000;">250</span> <span style="color: #000000; font-weight: bold;">then</span> restart<br />
<span style="color: #000000; font-weight: bold;">if</span> loadavg<span style="color: #7a0874; font-weight: bold;">&#40;</span>5min<span style="color: #7a0874; font-weight: bold;">&#41;</span> greater than <span style="color: #000000;">10</span> <span style="color: #000000; font-weight: bold;">for</span> <span style="color: #000000;">8</span> cycles <span style="color: #000000; font-weight: bold;">then</span> stop<br />
<span style="color: #000000; font-weight: bold;">if</span> failed host 127.0.0.1 port <span style="color: #000000;">80</span> <span style="color: #000000; font-weight: bold;">then</span> restart<br />
<span style="color: #000000; font-weight: bold;">if</span> <span style="color: #000000;">3</span> restarts within <span style="color: #000000;">5</span> cycles <span style="color: #000000; font-weight: bold;">then</span> timeout<br />
<br />
check process postfix with pidfile <span style="color: #000000; font-weight: bold;">/</span>var<span style="color: #000000; font-weight: bold;">/</span>spool<span style="color: #000000; font-weight: bold;">/</span>postfix<span style="color: #000000; font-weight: bold;">/</span>pid<span style="color: #000000; font-weight: bold;">/</span>master.pid<br />
group mail<br />
start program = <span style="color: #ff0000;">&quot;/etc/init.d/postfix start&quot;</span><br />
stop program = <span style="color: #ff0000;">&quot;/etc/init.d/postfix stop&quot;</span><br />
<span style="color: #000000; font-weight: bold;">if</span> failed port <span style="color: #000000;">25</span> protocol smtp <span style="color: #000000; font-weight: bold;">then</span> restart<br />
<span style="color: #000000; font-weight: bold;">if</span> <span style="color: #000000;">5</span> restarts within <span style="color: #000000;">5</span> cycles <span style="color: #000000; font-weight: bold;">then</span> timeout<br />
<br />
check process postgres with pidfile <span style="color: #000000; font-weight: bold;">/</span>var<span style="color: #000000; font-weight: bold;">/</span>lib<span style="color: #000000; font-weight: bold;">/</span>postgresql<span style="color: #000000; font-weight: bold;">/</span><span style="color: #000000;">8.4</span><span style="color: #000000; font-weight: bold;">/</span>main<span style="color: #000000; font-weight: bold;">/</span>postmaster.pid<br />
group database<br />
start program = <span style="color: #ff0000;">&quot;/etc/init.d/postgresql start&quot;</span><br />
stop program = <span style="color: #ff0000;">&quot;/etc/init.d/postgresql stop&quot;</span><br />
<span style="color: #000000; font-weight: bold;">if</span> failed unixsocket <span style="color: #000000; font-weight: bold;">/</span>var<span style="color: #000000; font-weight: bold;">/</span>run<span style="color: #000000; font-weight: bold;">/</span>postgresql<span style="color: #000000; font-weight: bold;">/</span>.s.PGSQL.5432 protocol pgsql<br />
<span style="color: #000000; font-weight: bold;">then</span> restart<br />
<span style="color: #000000; font-weight: bold;">if</span> failed host 127.0.0.1 port <span style="color: #000000;">5432</span> protocol pgsql <span style="color: #000000; font-weight: bold;">then</span> restart<br />
<span style="color: #000000; font-weight: bold;">if</span> <span style="color: #000000;">5</span> restarts within <span style="color: #000000;">5</span> cycles <span style="color: #000000; font-weight: bold;">then</span> timeout<br />
<br />
check process vsftpd with pidfile <span style="color: #000000; font-weight: bold;">/</span>var<span style="color: #000000; font-weight: bold;">/</span>run<span style="color: #000000; font-weight: bold;">/</span>vsftpd<span style="color: #000000; font-weight: bold;">/</span>vsftpd.pid<br />
start program = <span style="color: #ff0000;">&quot;/etc/init.d/vsftpd start&quot;</span><br />
stop program = <span style="color: #ff0000;">&quot;/etc/init.d/vsftpd stop&quot;</span><br />
<span style="color: #000000; font-weight: bold;">if</span> failed port <span style="color: #000000;">21</span> protocol <span style="color: #c20cb9; font-weight: bold;">ftp</span> <span style="color: #000000; font-weight: bold;">then</span> restart<br />
<span style="color: #000000; font-weight: bold;">if</span> <span style="color: #000000;">5</span> restarts within <span style="color: #000000;">5</span> cycles <span style="color: #000000; font-weight: bold;">then</span> timeout</div></div>
<p>&nbsp;</p>
<p>Sve je manje-vise self explanatory, na procese koji inace trose najvise resursa (apache, mysql) stavljamo mali monitoring procesa,memorije i cpu iskoristenosti u ostalim slucajevima restart servisa se vrsi na fail konektovanja na port/socket.</p>
<p>&nbsp;</p>
<p><a href="http://mmonit.com/monit" target="_blank">Monit</a></p>
<p><a href="http://mmonit.com/wiki/Monit/ConfigurationExamples" target="_blank">Monit configuration examples</a></p>
]]></content:encoded>
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		</item>
		<item>
		<title>hello World</title>
		<link>http://amar.ba/hello_world/</link>
		<comments>http://amar.ba/hello_world/#comments</comments>
		<pubDate>Mon, 07 Nov 2011 16:52:36 +0000</pubDate>
		<dc:creator>amar</dc:creator>
				<category><![CDATA[dummy kategorija]]></category>

		<guid isPermaLink="false">http://amar.ba/?p=15</guid>
		<description><![CDATA[Nekad bas u novembru prosle godine sam napisao zadnji post na sad vec starom (dizajnerski starom) blogu. Koncepcija i sadrzaj su mi se vremenom sve manje svidjali, a kad na to dodas ljenost kad je pisanje u pitanju.. dobijes godinu dana stagnacije. Zbog toga ovaj put blog koji je tezak manje od 50k, koji nema [...]]]></description>
			<content:encoded><![CDATA[<p><span id="more-15"></span>Nekad bas u novembru prosle godine sam napisao zadnji post na sad vec starom (dizajnerski starom) blogu. Koncepcija i sadrzaj su mi se vremenom sve manje svidjali, a kad na to dodas ljenost kad je pisanje u pitanju.. dobijes godinu dana stagnacije.</p>
<p>Zbog toga ovaj put blog koji je tezak manje od 50k, koji nema boja,komentara,linkova,kategorija,tagova,headera,footera,widget-a.. Skontao sam da kad vec rijetko pisem,posvetiti se izgledu bloga je nonsense.. iako ce se nama koji tezimo minimalizmu ovakav izgled vise svidjeti.</p>
<p>Kad je u pitanju sadrzaj i tu cu da promjenim neke stvari. Tako se tu vise nece naci teme o ljubavi,eurosongu,zivotinjama.. Ovaj put blog ce biti samo i jedino o tehnoligjama i to 99% o Linuxima, Debianima, serverima itd..</p>
<p>Do narednog post-a..</p>
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