Harik posted:

anthonypants posted:

What does "stealing 8GB of ram" mean?

anthonypants posted:

What does "stealing 8GB of ram" mean?

mike12345 posted:

Say my own kernel is more recent than the one in the release I'm updating to, will it just skip dealing with the kernel, or install its kernel alongside?

Odette posted:

I just setup my own mail server with Dovecot/Postfix using virtual hosts/domains/etc. Have installed ClamAV, SpamAssassin, OpenDKIM & setup a few extras (SPF/DKIM/DMARC)

I've got Roundcube up with some plugins too. It's been an interesting experience just learning about everything involved.

Does anyone know any other cool things I can do in regards to mail? I've got iptables & fail2ban up, so that part is covered.

xtal posted:

Can I take this opportunity to ask an email thing too? My email provider provides POP and IMAP but instead of backing it all up, I want to use POP to automatically move all the emails to my home server and then connect my devices to that (don't worry, they are not classified.) Does having a POP downloader and an IMAP server at home make the most sense? Would I use Dovecot and what else?

I'm still going to use my email provider's SMTP servers and only fetch mail from them after they've received it, so I don't think I need to be concerned about SPF and all that crap.

xzzy posted:

For the ultimate challenge drop $10/month on a digitalocean droplet and run email under your own domain.

xtal posted:

I actually did that for a while after Lavabit shut down my email account, but now my paranoia doesn't extend far enough for me to deal with SPF / DKIM / etc

jre posted:

SPF and DKIM have nothing to do with paranoia and everything to do with avoiding all your email being blackholed

Bob Morales posted:

Been running all day on the last Ubuntu install, must have been the drive.

Is there a reason why using the volume control in the menubar doesn't have any effect on individual applications like Audacious or RhythmBox?

apropos man posted:

The one in the menubar might be just affecting the wrong sound card. See what you can achieve by running alsamixer in the terminal. You can specify which sound card to tweak by using "alsamixer -c0", "alsamixer -c1" etc.

I find it handy if I've got a radio stream playing on my machine across the room and I want to turn the volume up or down. I just ssh from my laptop and use alsamixer

Bob Morales posted:

Been running all day on the last Ubuntu install, must have been the drive.

Is there a reason why using the volume control in the menubar doesn't have any effect on individual applications like Audacious or RhythmBox?

other people posted:

Put some debug statements in your script so you can see why it returns the value it does???????

I suppose if you get desperate you could strace it but hopefully if you understand what it is trying to do it will be relatively clear where the bad return code is coming from.

xzzy posted:

You need to find out what part of the php script is failing. Is the ssh successful? Is it running with the correct permissions (check selinux too)? Is the data returned in a sensible format?

Basically sprinkle your php script with echo statements and figure out where it's crapping.

RFC2324 posted:

Here is the thing... It works. For one server it works every time, for others it works sometimes. For one it only appears to work when manually invoked(even invoked as non-root), but never when invoked by cacti itself. It TECHNICALLY works. It just isn't returning the expected values(results from free -wb on various servers).

And it wasn't memcached.

theperminator posted:

So it's graphing -1's not NaN right? because NaN can mean a whole bunch of poo poo ranging from the columns not being output to the script exiting nonzero etc etc
When run manually, how long does it take to return a result?
Does the cacti user trust the host key of the monitored system(s)?

Things I would try:
1. Turn up poller logging in Settings > General > Poller logging level, wait for the next polling interval and observe the logs
2. Run the php script as the cacti user and observe any error output

Would it be possible to share the script in question?

RFC2324 posted:

Keys work, I've been trying as both root and the cacti user. Rrd is getting NaN, the script is returning -1 for everything.

The script can be easily found by googling ss_get_by_ssh.php (it's the percona script) and all i changed is the free command in the memory section and the way it parses the results(rhel 7.1 has a new free command with slightly different output). My changes work since it gives correct output when it gets any values at all

E: Diff showing my changes below, original can be found at https://github.com/percona/percona-monitoring-plugins/blob/master/cacti/scripts/ss_get_by_ssh.php

code:

<    return "free -ob";
---
>    return "free -wb";
890,891c892,894
<             $result['STAT_memused']   = sprintf('%.0f',
<                $words[2] - $words[4] - $words[5] - $words[6]);
---
>           $result['STAT_memused']   = $words[2];
> #            $result['STAT_memused']   = sprintf('%.0f',
> #               $words[2] - $words[4] - $words[5] - $words[6]);

RFC2324 posted:

Keys work, I've been trying as both root and the cacti user. Rrd is getting NaN, the script is returning -1 for everything.

The script can be easily found by googling ss_get_by_ssh.php (it's the percona script) and all i changed is the free command in the memory section and the way it parses the results(rhel 7.1 has a new free command with slightly different output). My changes work since it gives correct output when it gets any values at all

E: Diff showing my changes below, original can be found at https://github.com/percona/percona-monitoring-plugins/blob/master/cacti/scripts/ss_get_by_ssh.php

code:

<    return "free -ob";
---
>    return "free -wb";
890,891c892,894
<             $result['STAT_memused']   = sprintf('%.0f',
<                $words[2] - $words[4] - $words[5] - $words[6]);
---
>           $result['STAT_memused']   = $words[2];
> #            $result['STAT_memused']   = sprintf('%.0f',
> #               $words[2] - $words[4] - $words[5] - $words[6]);

anthonypants posted:

Is there a reason you got rid of that sprintf()?

theperminator posted:

The current version of the script doesn't use "free", it uses /proc/meminfo (probably exactly to cover the issue you had)
https://github.com/percona/percona-monitoring-plugins/pull/9
https://github.com/percona/percona-monitoring-plugins/commit/9db2767a18573a5ee3fb99d71e1eaececea792b2#diff-8e4aa3316b9e3f198f1754ff4a124bc2

RFC2324 posted:

Mostly because i want 100% sure what it did, other than some math that seemed off. The numbers i get out of it match reality tho so it doesn't seem to be the break point.

And when it returns numbers cacti handles them ok.

quote:

Cacti currently supports four types of data that RRDTool can represent for any given data source:

COUNTER: is for continuous incrementing counters like the ifInOctets counter in a router. The COUNTER data source assumes that the counter never decreases, except when a counter overflows. It is always a whole INTEGER, floating point numbers are invalid. The update function takes the overflow into account. The counter is stored as a per-second rate. When the counter overflows, RRDTool checks if the overflow happened at the 32bit or 64bit border and acts accordingly by adding an appropriate value to the result.

GAUGE: numbers that are not continuously incrementing, e.g. a temperature reading. Floating point numbers are accepted.

ABSOLUTE: counters that are reset upon reading

DERIVE: like COUNTER but without overflow checks

jre posted:

Is the thing you're returning definitely a gauge ? Otherwise your script will work when the result is 10 but not when its 9.5