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	<title>Valdinei dos Santos &#187; bash</title>
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		<title>Acertando a Hora *Unix &#8211; ntpdate</title>
		<link>http://www.valdineidossantos.com/2009/08/acertando-hora-unix-ntpdate/</link>
		<comments>http://www.valdineidossantos.com/2009/08/acertando-hora-unix-ntpdate/#comments</comments>
		<pubDate>Mon, 03 Aug 2009 20:22:33 +0000</pubDate>
		<dc:creator>Valdinei</dc:creator>
				<category><![CDATA[geral]]></category>
		<category><![CDATA[bash]]></category>
		<category><![CDATA[ntpdate]]></category>
		<category><![CDATA[sistema operacional]]></category>
		<category><![CDATA[unix]]></category>

		<guid isPermaLink="false">http://www.valdineidossantos.com/?p=107</guid>
		<description><![CDATA[Essa vai ser uma dica rápida. Como acertar a hora em sistemas *Unix (Linux, Freebsd, OpenBSD, etc). Usuários Ubuntu precisam ter o programa instalado. sudo aptitude install ntpdate Acertando a hora Vamos sincronizar a hora de nosso sistema com algum servidor público espalhado pelo mundo, no meu caso vou utilizar o da usp. sudo ntpdate [...]]]></description>
			<content:encoded><![CDATA[<p>Essa vai ser uma dica rápida. Como acertar a hora em sistemas *Unix (Linux, Freebsd, OpenBSD, etc).<br />
Usuários Ubuntu precisam ter o programa instalado. </p>
<pre class="brush: shell">
sudo aptitude install ntpdate
</pre>
<h3> Acertando a hora </h3>
<p>Vamos sincronizar a hora de nosso sistema com algum servidor público espalhado pelo mundo, no meu caso vou utilizar o da usp.</p>
<pre class="brush: shell">
sudo ntpdate ntp.usp.br
</pre>
<p>Isso já é o suficiente para acertar o horário da sua máquina. </p>
<p>Vamos um pouco mais a fundo agora. </p>
<p>Eu tenho que garantir que meus servidores estão com a hora sincronizada, para tanto vou fazer essa essa atualização todos os dias <img src='http://www.valdineidossantos.com/wp-includes/images/smilies/icon_smile.gif' alt=':)' class='wp-smiley' />  e para ficar ainda mais seguro vou fazer em 2 servidores diferentes <img src='http://www.valdineidossantos.com/wp-includes/images/smilies/icon_smile.gif' alt=':)' class='wp-smiley' />  <img src='http://www.valdineidossantos.com/wp-includes/images/smilies/icon_smile.gif' alt=':)' class='wp-smiley' /> </p>
<p>Segue o script para fazer essa atualização em uma máquina FreeBSD.</p>
<pre class="brush: shell">
#!/usr/local/bin/bash
ntpdate=`which ntpdate`

#Lista de servers ntpdate espalhados pelo mundo pode-se adicionar quantos quiser separados por espaço
SERVERS="ntp.pool.org ntp.usp.br"

for server in $SERVERS
do
   $ntpdate $server
done
</pre>
<p>Esse script deve ser salvo e precisa estar com permissão de execução ( chmod +x atualizaHora.sh ) após isso foi enviado para a pasta <b>  /usr/local/etc/periodic/daily </b> onde será executado todos os dias. </p>
<p>Esse procedimento poderia ser feito pelo crontab também, mas ao preferi coloca-lo nesta pasta pois ela já é chamada via crontab do root.</p>
<p>Complementando a informação a porta de entrada e saida do NTPDATE é a  123 isso mesmo 123,  sendo assim essa porta deve estar aberta no firewall da máquina que se deseja sincronizar.</p>
<h4> Outros servers ntpdate </h4>
<ul>
<li> time.windows.com </li>
<li> time.apple.com </li>
<li> ntp.ufrj.br </li>
<li> ntp.ubuntu.com </li>
</ul>
<p>Pronto hora ajustada, então é hora de partir.<br />
Abraços.</p>


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