Category Archives: raspberry pi

Timemachine on Gateway pi

Some people for whom I provide some kinds of support with gateway pis, use Macs. For the pc folk – at least for those on Windows 10, I’ve been seting up to do the filehistory thing, and putting the filehistory onto the /backup drive on the gateway pi. Then it gets sent here overnight. I wanted to do the same for the folks who have Macs, of which there are several.

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No Worthy mechs

I just built another little gateway pi, on Raspbian. It is a newer Raspbian than I used for the others. And newer is better, right? But when the little fellow came up, postfix claimed it couldn’t relay through tarragon, because it couldn’t accomplish login. Sasl authentication failed, no worthy mechs.

I remember good old “no worthy mechs” from way back when, always thought it a very cool error message. But why in the heck am I getting this? I’m not doing anything fancy.

I had a vague nagging feeling from some old Fedora problems, long ago. Could it be that I have to install some kind of sasl library, even to do plain authentication? Poked around a little. Eventually did an apt install libsasl2-modules and sasl2-bin. Sure enough, they actually installed.

And afterwords postfix came up and send the mail out of the queue. I’ll be dipped in … I am surprised. This was not something I had to do before. Is this an improvement in Raspbian. Don’t package any sasl mechs, make the poor sod figure out why sasl authentication won’t work.

This is to help me remember the next time this happens.

Memory on the Gateway Pi

I now have 8 of these gateway boxes out there. This morning as I was checking backups on one of them, I observed that it took quite a long time to respond. I ran a top on it and was horrified to see that its memory use was 100% and so was its swap. Holy @#$%!@ Batman!

Most of the memory was being used by the lxpanel. And (hangs head in embarrassment) there were actually two lxpanels running – one for the console and one in the vnc window I launch at startup.

It seems the lxpanels leak. I don’t know how badly, but it doesn’t matter. These boxes are meant to run forever so even a tiny leak is eventually fatal.

Well this was simple. I will seldom, if ever, need to get into a graphical environment remotely, and if I do I can always start vnc from the command line. So I took out the startvnc from the startup script. And I have even LESS need for a graphical console since there is not even a monitor on these things. So I set the default systemd target to multi-user.target.

Did this on all the gateways that are running on pi-zeros. Those few running on bigger ubuntu boxes I didn’t really have the problem anyway.

After rebooting them they come up with no lxpanels. I’ll watch the memory use, but I think this will fix the problem.