<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Olivier,<div class=""><br class=""></div><div class="">question is, if you have one public IP address for both servers (behind NAT), or every one have own public IP address. In first case do nothing, only correctly set up postfix on new server as on old one. In second case you must add second server as next mail server (MX record) with low priorinty number. Good practice also is to reduce the expiration MX records to a small value (600s). In this moment you must turn off postfix or block postfix ports by firewall on new server, otherwise new server begin receiving mail before shutting down the old server. After sync turn off old server, turn on postfix (unblock) on new server and delete old MX record.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Ludvik</div><div class=""><br class=""></div><div class=""><br class=""><div class=""><div class="">
<div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><div style="line-height: normal;" class=""><div class="">S pozdravem</div><div class=""><br class=""><div apple-content-edited="true" class=""><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px;"><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><span class="Apple-style-span" style="border-collapse: separate; orphans: 2; widows: 2; border-spacing: 0px;"><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px;"><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px;"><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px;"><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px;"><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px;"><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class="" style="margin: 0px;"><div class="" style="margin: 0px;">Ludvík Schmarcz</div><div class="" style="margin: 0px;">IT specialista</div><div class="" style="margin: 0px;"><br class=""></div><div class="" style="margin: 0px;">tel.: 777 726 780</div><br class="Apple-interchange-newline" style="font-size: medium;"></div></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></div></div><br class="Apple-interchange-newline" style="line-height: normal;"></div><span><img height="150" width="150" apple-inline="yes" id="DD442B4D-38A3-4659-B668-EE35CD762AA0" apple-width="yes" apple-height="yes" src="cid:0C09C6EF-C5E3-418B-B7B9-53B51140A406" class=""></span><div class="" style="color: rgb(0, 0, 0); font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';"><br class="Apple-interchange-newline"><br class="Apple-interchange-newline"><br class="Apple-interchange-newline"><br class="Apple-interchange-newline"><br class="Apple-interchange-newline"><br class="Apple-interchange-newline">--</div><div class="" style="color: rgb(0, 0, 0); font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';">--------------------------------------</div><div class="" style="color: rgb(0, 0, 0); font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';">---- Black Sun IT Services s.r.o. ----</div><div class="" style="color: rgb(0, 0, 0); font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';">--------------------------------------</div><div class="" style="color: rgb(0, 0, 0); font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';">-- computers - graphics - solutions --</div><div class="" style="color: rgb(0, 0, 0); font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';">--- networks - internet - intranet ---</div><div class="" style="color: rgb(0, 0, 0); font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';">--------------------------------------</div><div class="" style="font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New'; color: rgb(41, 81, 169);"><span class="" style="color: rgb(0, 0, 0);">------- <a href="http://www.blacksun.cz/" class="">http://www.blacksun.cz</a> -------</span></div><div class="" style="color: rgb(0, 0, 0); font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';">--------------------------------------</div>
</div>
<br class=""><div><blockquote type="cite" class=""><div class="">14. 3. 2017 v 22:38, Olivier Boucard <<a href="mailto:olivier@pafostech.com" class="">olivier@pafostech.com</a>>:</div><br class="Apple-interchange-newline"><div class="">
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" class="">
<div bgcolor="#FFFFFF" text="#000000" class="">
Hi Ludvik,<br class="">
<br class="">
Thanks for the tips.<br class="">
I vaguely remember having some mandatory DNS, and reverse-DNS, setup
to do before installing. Is it not anymore the case?<br class="">
<br class="">
Olivier<br class="">
<br class="">
<div class="moz-cite-prefix">On 2017-03-14 19:21, Ludvík Schmarcz
wrote:<br class="">
</div>
<blockquote cite="mid:F685A7A7-AD06-4217-870D-6C9D3DCC8357@blacksun.cz" type="cite" class="">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" class="">
Hi Olivier,
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">In my experience, the best new installation, add
users and use imapsync. If the servers are virtualized, downtime
is tens of seconds (only change IP addresses behind the firewall
after last syncronisation).</div>
<div class=""><br class="">
</div>
<div class="">Ludvik</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
<div class="">
<div style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-position: normal; font-variant-caps: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<div style="line-height: normal;" class="">
<div class="">S pozdravem</div>
<div class=""><br class="">
<div apple-content-edited="true" class=""><span class="Apple-style-span" style="border-collapse:
separate; border-spacing: 0px;">
<div class="" style="word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space;"><span class="Apple-style-span" style="border-collapse: separate; orphans: 2;
widows: 2; border-spacing: 0px;">
<div class="" style="word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space;"><span class="Apple-style-span" style="border-collapse: separate;
border-spacing: 0px;">
<div class="" style="word-wrap: break-word;
-webkit-nbsp-mode: space;
-webkit-line-break: after-white-space;"><span class="Apple-style-span" style="border-collapse: separate;
border-spacing: 0px;">
<div class="" style="word-wrap:
break-word; -webkit-nbsp-mode: space;
-webkit-line-break:
after-white-space;"><span class="Apple-style-span" style="border-collapse: separate;
border-spacing: 0px;">
<div class="" style="word-wrap:
break-word; -webkit-nbsp-mode:
space; -webkit-line-break:
after-white-space;"><span class="Apple-style-span" style="border-collapse:
separate; border-spacing: 0px;">
<div class="" style="word-wrap:
break-word; -webkit-nbsp-mode:
space; -webkit-line-break:
after-white-space;"><span class="Apple-style-span" style="border-collapse:
separate; border-spacing:
0px;">
<div class="" style="word-wrap:
break-word;
-webkit-nbsp-mode: space;
-webkit-line-break:
after-white-space;">
<div class="" style="margin: 0px;">
<div class="" style="margin: 0px;">Ludvík
Schmarcz</div>
<div class="" style="margin: 0px;">IT
specialista</div>
<div class="" style="margin: 0px;"><br class="">
</div>
<div class="" style="margin: 0px;">tel.:
777 726 780</div>
<br class="Apple-interchange-newline" style="font-size: inherit;">
</div>
</div>
</span></div>
</span></div>
</span></div>
</span></div>
</span></div>
</span></div>
</span></div>
</div>
</div>
<br class="Apple-interchange-newline" style="line-height:
normal;">
</div>
<span class=""><span id="cid:0C09C6EF-C5E3-418B-B7B9-53B51140A406"><PastedGraphic-1.tiff></span></span>
<div class="" style="font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-position: normal; font-variant-caps: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';"><br class="Apple-interchange-newline">
<br class="Apple-interchange-newline">
<br class="Apple-interchange-newline">
<br class="Apple-interchange-newline">
<br class="Apple-interchange-newline">
<br class="Apple-interchange-newline">
--</div>
<div class="" style="font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-position: normal; font-variant-caps: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';">--------------------------------------</div>
<div class="" style="font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-position: normal; font-variant-caps: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';">---- Black Sun IT Services
s.r.o. ----</div>
<div class="" style="font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-position: normal; font-variant-caps: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';">--------------------------------------</div>
<div class="" style="font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-position: normal; font-variant-caps: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';">-- computers - graphics -
solutions --</div>
<div class="" style="font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-position: normal; font-variant-caps: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';">--- networks - internet -
intranet ---</div>
<div class="" style="font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-position: normal; font-variant-caps: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';">--------------------------------------</div>
<div class="" style="font-size: 12px; font-style: normal;
font-variant: normal; font-weight: normal; letter-spacing:
normal; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; word-spacing:
0px; -webkit-text-stroke-width: 0px; line-height: normal;
orphans: 2; widows: 2; margin: 0px; font-family: 'Courier
New'; color: rgb(41, 81, 169);"><span class="" style="">------- <a moz-do-not-send="true" href="http://www.blacksun.cz/" class="">http://www.blacksun.cz</a> -------</span></div>
<div class="" style="font-size: 12px; font-style: normal; font-variant-ligatures: normal; font-variant-position: normal; font-variant-caps: normal; font-variant-numeric: normal; font-variant-alternates: normal; font-variant-east-asian: normal; font-weight: normal; letter-spacing: normal; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; line-height: normal; orphans: 2; widows: 2; margin: 0px; font-family: 'Courier New';">--------------------------------------</div>
</div>
<br class="">
<div class="">
<blockquote type="cite" class="">
<div class="">14. 3. 2017 v 16:37, Olivier Boucard <<a moz-do-not-send="true" href="mailto:olivier@pafostech.com" class="">olivier@pafostech.com</a>>:</div>
<br class="Apple-interchange-newline">
<div class="">
<meta http-equiv="content-type" content="text/html;
charset=utf-8" class="">
<div bgcolor="#FFFFFF" text="#000000" class=""><p class=""><font class="" face="Helvetica, Arial,
sans-serif">Hi,</font></p><p class=""><font class="" face="Helvetica, Arial,
sans-serif">I have an old Kolab 3.3 running on an
old CentOS 6. I would like to migrate to a new
server running CentOS 7 with the latest Kolab.</font></p><p class=""><font class="" face="Helvetica, Arial,
sans-serif">What would be the steps (not in details
just the overall process) to do such a migration
with no service interruption (keeping the old server
running)?<br class="">
Especially concerning the DNS configuration.</font></p><p class=""><font class="" face="Helvetica, Arial,
sans-serif">Thanks</font></p><p class=""><font class="" face="Helvetica, Arial,
sans-serif">Olivier Boucard<br class="">
</font></p>
</div>
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</blockquote>
</div>
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</div>
</blockquote>
<br class="">
</div>
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