Category Archives: software

Just a simple mail server installation

by

So, the mail server at work died on Wednesday. It was running Microsoft Exchange and died so utterly completely that even with several hours of premium support from Microsoft, they were unable to get it up and running again. Being one that comes in fairly early in the morning, and already am managing a few internal servers, I was asked to set up a new box using Linux or whatever.

Can’t be too difficult, huh?

Well, that depends. In this case, I needed to have it authenticate users against an Active Directory server and support mail aliases set up in its user database. After doing a fair amount of googling around, I found a few guides that helped me along the way. I started out with iRedMail and continued by configuring it to talk to the Active Directory server. Never having worked with AD or Kerberos before, it took me quite some time to get Kerberos working (tip: have a look at what the DNS thinks is the domain name of the KDC, in our case it was “BT.LOCAL” in all uppercase; use anything else as the Kerberos realm and all I got was cryptic error messages).

I had some hurdles to overcome, getting postfix to authenticate with Active Directory’s LDAP server was fairly easy once I a) had the unprivileged account that could do LDAP lookups (using the “Administrator” account for that does not work), and b) reduced the LDAP query so that it would actually find the users I was looking for (tip: make a dump of the LDAP directory and look at the lowest common denominator for the lookup keys).

Then I had the problem of Dovecot, which handles local mail delivery and IMAP/POP, could not read the mail that it had stored in mailboxes. It turned out that since I had set up Kerberos so that the AD users were available as Unix users, and had the recipient domain (“bt.local” from above) in “mydestination”, Postfix would always setuid the LDA. I had to remove the domain from there and add it to the list of virtual domains for that to work.

All in all, it took me about a day and half to get the thing set up. Not bad for the first time. I did set up Git to version-control all the important configuration files so that I can track my future mistakes and revert to a working configuration.

Now to get the SMTP SASL configuration working…

Singing to a new tune

by

Back in 1995, when I got access to the Internet for the first time, the dominant web browser was Netscape Navigator. While it had its flaws, its main audience were power-users, much because only power-users had Internet access at that time. It had its flaws, and in 1996 I found a small Norwegian browser called Opera. I came in at version 2.12, one of the first public releases, and was hooked from day one.

I continued to use Opera for quite some time, especially while working for the company that made it for over ten years (first from 2000 to 2007, and then again from 2009 to 2012). During this time, Opera was the choice for power-users, but this all changed when they switched rendering engines in 2013 (which was also the reason for me leaving the company at that time). I was happy with the decision to switch engines, as Presto did have some architectural issues that were different to overcome, what I didn’t like was how they killed off almost all the power-user featured creating a “simple” browser.

There are enough of the simple browsers. I use them from time to time, like Google Chrome, which still feels like I’m waiting for it to become a proper browser with a proper UI (and it’s up to version 40-something already), like Firefox, which keeps losing UI elements for each new release, and like the new Opera, which fortunately did get bookmarks back recently. I have not really tested the new Opera that much, and I must confess I am still using Opera 12 as my main browser, despite it starting to show its age.

Enter Vivaldi. Established by one of the two co-founders of Opera Software, Vivaldi started out with a community, to coincide with Opera Software shutting down their My Opera community. Recently, they also announced availability of the Vivaldi Browser, a new browser targeted at power-users. Like the new Opera, it is based on Chromium, the open-source engine of Google Chrome, but unlike Opera, Vivaldi is trying to create a browsing experience like the old Opera browser did. I was happy to be invited to beta test it a couple of months before the release of the first technical preview, and while it still has some issues to work out, it is coming close to becoming my first choice in browsers (I just need to replace the e-mail client, IRC client and RSS aggregator part of Opera before letting it go completely).

Configurability, customizability and ease of use all in one.  There’s no contradiction in doing it all at once. And since it is based on the Chromium engine, sites that are coded to work with Google Chrome just work as expected.

If you haven’t already, you should give it a try!