IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 13 November 2017 (all times are UTC)
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| 08:58 | <Natureshadow> They appear after you read the netiquette or the Freenode FAQ ;)
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| 16:25 | <truth_> Hi, I am using a LTSP-PNP server (Debian) and two fat-clients for my family for two years now - many thanks for this great system.
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| 16:25 | Since the server is usually not used over night the server goes to suspend mode over night.
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| 16:25 | For automatic backup the server wakes up in the morning (e.g. echo `date '+%s' -d 'tomorrow 5:55'` > /sys/class/rtc/rtc0/wakealarm).
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| 16:25 | My problem is that this wakealarm is also present on the clients - ... /etc/ltsp/ltsp-update-image.excludes does not help here.
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| 16:25 | How can I limit my wakealarm only to the server?
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| 16:45 | <alkisg> (06:25:46 μμ) truth_: For automatic backup the server wakes up in the morning (e.g. echo `date '+%s' -d 'tomorrow 5:55'` > /sys/class/rtc/rtc0/wakealarm). ==> don't run that command on the clients
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| 16:45 | How do you run it? Take care so that it doesn't run on the clients
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| 16:49 | <truth_> It's automatically done via cron - in order to not run it on the client I added the following line to ltsp-update-image.excludes: var/spool/cron/crontabs/root
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| 16:53 | <||cw> truth_: are you using nbd images or nfs (which is typically the debian default)?
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| 16:55 | <truth_> BOOT_METHODS="NBD"
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| 16:59 | <vagrantc> debian switched to NBD in the latest stable release
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| 17:00 | NFS didn't play nice with overlay fs
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| 17:01 | * vagrantc thought the cron service was disabled by default on LTSP clients ... maybe not | |
| 17:07 | <truth_> The cron-script (one the server) which is doing the automatic backup does finally set the wakeup-time for the next day - however, when I start the client I can see that the wakeup-time also present at the client.
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| 17:08 | <vagrantc> presumably it's storing that information in some other file?
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| 17:08 | what mechanism are you using to set the wakeup-time?
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| 17:09 | <truth_> I set the time with: echo `date '+%s' -d 'tomorrow 5:55'` > /sys/class/rtc/rtc0/wakealarm
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| 17:09 | The result is visible with: cat /proc/driver/rtc
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| 17:10 | <alkisg> truth_: and is that line (a) on the server /var/spool... and (b) on the client /var/spool?
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| 17:10 | Cron is enabled on all ltsp clients, except for very low ram thin clients
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| 17:11 | <vagrantc> alkisg: ah, right. low ram specs..
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| 17:11 | <alkisg> Dat one :)
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| 17:12 | truth_: ltsp-update-image.excludes is indeed the correct way to do this; you just need to find the correct file, in case you didn't
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| 17:13 | <vagrantc> truth_: i'm guessing you need to edit /etc/cron.* or root's ~/.crontab or something
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| 17:13 | truth_: not the /var/spool entry
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| 17:13 | <alkisg> /root/* shouldn't be in the image
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| 17:13 | /etc/cron would be, yeah
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| 17:13 | <vagrantc> narrowing it down... :)
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| 17:14 | truth_: or, disable whatever mechanism you're using for your cron job, and set up your cron job in /etc/cron.d/ and then exclude that from the image
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| 17:14 | <alkisg> And that's already there: var/spool/cron/crontabs/*
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| 17:14 | <vagrantc> truth_: how did you configure the cron job?
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| 17:15 | <truth_> The directory '/var/spool/cron/crontabs/' does not contain the file 'root' - which means, the cron-script is not present at the client
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| 17:15 | <alkisg> truth_: and is it there on the server?
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| 17:16 | <vagrantc> truth_: /var/spool isn't typically where you would configure these sorts of things...
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| 17:16 | <truth_> yes! -rw------- 1 root crontab 1119 Okt 31 14:56 root
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| 17:16 | <vagrantc> did you use "crontab -e" to create the cron job? did you edit a file somewhere?
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| 17:16 | <alkisg> And it contains the line you're talking about?
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| 17:17 | Maybe you configured it in multiple places..
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| 17:17 | sudo grep -r tomorrow /etc 2>/dev/null
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| 17:17 | That should help :)
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| 17:18 | * vagrantc would find it easier to help if questions actually got answered :/ | |
| 17:18 | <truth_> I only used crontab -e
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| 17:18 | grep -r tomorrow /etc 2>/dev/null does not show a result ...
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| 17:23 | <alkisg> sudo mount -o loop,ro /opt/ltsp/images/i386.img /mnt
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| 17:23 | sudo grep -r tomorrow /mnt 2>/dev/null
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| 17:24 | This will search the whole client image :)
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| 17:24 | <truth_> crontab -e does only contain the name of the backup script: 30 5 * * * /root/start_backup
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| 17:24 | <alkisg> well then search for that one
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| 17:24 | You didn't tell us that :)
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| 17:25 | * vagrantc ponders porting LTSP to GuixSD | |
| 17:26 | <vagrantc> there would be some very interesting challenges...
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| 17:29 | <truth_> The first lines of the script are:
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| 17:29 | echo 0 > /sys/class/rtc/rtc0/wakealarm
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| 17:29 | echo `date '+%s' -d 'tomorrow 5:25'` > /sys/class/rtc/rtc0/wakealarm
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| 17:29 | The rest is for the backup.
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| 17:29 | Since the script is located in root it is by default excluded from the image, right?
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| 17:34 | As already mentioned ... adding 'sys/class/rtc/rtc0/wakealarm' to the exclude file didn't help.
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| 17:34 | I started to disable ACPI on my client but that doesn't seem to be the right way ...
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| 17:35 | <alkisg> (06:49:51 μμ) truth_: It's automatically done via cron - in order to not run it on the client I added the following line to ltsp-update-image.excludes: var/spool/cron/crontabs/root
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| 17:35 | <vagrantc> sys is dynamically mounted at boot
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| 17:35 | <alkisg> (07:34:22 μμ) truth_: As already mentioned ... adding 'sys/class/rtc/rtc0/wakealarm' to the exclude file didn't help.
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| 17:35 | truth_: you are contradicting yourself :)
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| 17:36 | Try searching inside the image, as I said above
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| 17:37 | <truth_> ok
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| 17:56 | <truth_> Many thanks for your suggestions - I found the problem.
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| 17:56 | In addition to the cron-script there is a startup-script which is only used during boot to set the wakeup-time (which is necessary since otherwise the cron-script will not be able to start).
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| 17:56 | Sorry - I have completely overseen this - I think I know how to solve this now.
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| 17:56 | Manny thanks again.
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| 18:00 | <alkisg> np
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