After Ubuntu 22/24 Upgrade syslog getting spammed and grows way to much clogging up the diskspace
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Ah no that is correct. Sorry what I meant is, that Cloudron task or app related logs should not show up in default syslog as such, like when you would run
journalctl -fHowever you should have acloudron-syslogdaemon running. Check withsystemctl status cloudron-syslogThat one would dump corresponding logs into the correct places in
/home/yellowtent/paltformdata/logs/...So still I am curious how it ends up in
/var/log/syslogand then why it would log db dump data there. -
Thanks for your feedback, @nebulon
I'm not sure why, but Cloudron created my app containers with Docker’s syslog log driver. Those containers write their stdout/stderr straight into the host’s rsyslog, which in turn writes to /var/log/syslog.
So when an app (Uptime Kuma in my case) runs a huge sqlite3 .dump during a Cloudron task/backup, that dump goes to stdout → syslog → /var/log/syslog, ballooning the file by GBs. This is not journald forwarding (it’s disabled). Cloudron’s own cloudron-syslog also logs per-app to /home/yellowtent/platformdata/logs/…, so right now there’s duplication.I’m not looking for a local workaround; I’d like Cloudron to confirm the intent here and provide a platform fix.
Below, the findings and some questions/proposals to pursue
Dockerd default vs. container reality
systemctl show docker -p ExecStart # ... --log-driver=journald ...docker ps -a -q | xargs -r -I{} docker inspect {} \ --format '{{.Name}} {{.HostConfig.LogConfig.Type}}' | sort -u # ~80 containers → all: syslog
The daemon default is journald, but all existing containers are syslog (likely from when they were created).Not journald → syslog; it’s Docker → rsyslog
grep -n 'ForwardToSyslog' /etc/systemd/journald.conf # ForwardToSyslog=no journald isn’t forwarding.Rsyslog is writing everything to /var/log/syslog
grep -nH . /etc/rsyslog.d/50-default.conf | sed -n '8,12p' # *.*;auth,authpriv.none -/var/log/syslogCloudron syslog collector is active (so we have duplicate paths)
systemctl status cloudron-syslog # active (running) ls /home/yellowtent/platformdata/logs/ # per-app log dirs + syslog.sock presentThe big spill: SQL dump text in logs exactly at backup window
root@ubuntu-cloudron-16gb-nbg1-3:~# grep -nE 'BEGIN TRANSACTION|CREATE TABLE \[heartbeat\]|INSERT INTO heartbeat' /var/log/syslog | head -3 1152:2025-08-31T21:00:37.705303+00:00 ubuntu-cloudron-16gb-nbg1-3 d6750120460b[1123]: BEGIN TRANSACTION; 1153:2025-08-31T21:00:37.705386+00:00 ubuntu-cloudron-16gb-nbg1-3 d6750120460b[1123]: CREATE TABLE [heartbeat](#015 1162:2025-08-31T21:00:37.705789+00:00 ubuntu-cloudron-16gb-nbg1-3 d6750120460b[1123]: INSERT INTO heartbeat VALUES(1,1,1,1,'200 - OK','2025-03-27 23:26:53.602',566,0,0); And Cloudron task timeline around the same minute:root@ubuntu-cloudron-16gb-nbg1-3:~# grep -n '2025-08-31T21:0' /home/yellowtent/platformdata/logs/box.log | sed -n '1,40p' 9200:2025-08-31T21:00:00.014Z box:janitor Cleaning up expired tokens 9201:2025-08-31T21:00:00.016Z box:eventlog cleanup: pruning events. creationTime: Mon Jun 02 2025 21:00:00 GMT+0000 (Coordinated Universal Time) 9202:2025-08-31T21:00:00.054Z box:locks write: current locks: {"backup_task":null} 9203:2025-08-31T21:00:00.054Z box:locks acquire: backup_task 9204:2025-08-31T21:00:00.054Z box:janitor Cleaned up 0 expired tokens 9205:2025-08-31T21:00:00.166Z box:tasks startTask - starting task 7053 with options {"timeout":86400000,"nice":15,"memoryLimit":1024,"oomScoreAdjust":-999}. logs at /home/yellowtent/platformdata/logs/tasks/7053.log 9206:2025-08-31T21:00:00.168Z box:shell tasks /usr/bin/sudo -S -E /home/yellowtent/box/src/scripts/starttask.sh 7053 /home/yellowtent/platformdata/logs/tasks/7053.log 15 1024 -999 9207:2025-08-31T21:00:00.249Z box:shell Running as unit: box-task-7053.service; invocation ID: fa4cf334a41b43fc9e06d6612bf5a9c1 9209:2025-08-31T21:00:00.395Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9210:2025-08-31T21:00:10.288Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9211:2025-08-31T21:00:20.321Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9212:2025-08-31T21:00:30.367Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9213:2025-08-31T21:00:40.579Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9214:2025-08-31T21:00:50.457Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9215:2025-08-31T21:01:00.455Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9216:2025-08-31T21:01:10.350Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9217:2025-08-31T21:01:20.413Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9218:2025-08-31T21:01:30.407Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9219:2025-08-31T21:01:40.367Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9220:2025-08-31T21:01:50.352Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9221:2025-08-31T21:02:00.390Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9222:2025-08-31T21:02:10.709Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9223:2025-08-31T21:02:11.024Z box:shell system: swapon --noheadings --raw --bytes --show=type,size,used,name 9224:2025-08-31T21:02:20.338Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9225:2025-08-31T21:02:30.311Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9226:2025-08-31T21:02:40.300Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9227:2025-08-31T21:02:50.308Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9228:2025-08-31T21:03:00.406Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9229:2025-08-31T21:03:10.269Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9230:2025-08-31T21:03:20.363Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9231:2025-08-31T21:03:30.265Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9232:2025-08-31T21:03:40.281Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9233:2025-08-31T21:03:50.312Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9234:2025-08-31T21:04:00.321Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9235:2025-08-31T21:04:10.284Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9236:2025-08-31T21:04:20.357Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9237:2025-08-31T21:04:30.242Z box:apphealthmonitor app health: 31 running / 0 stopped / 0 unresponsive 9238:2025-08-31T21:04:30.281Z box:shell Finished with result: success 9245:2025-08-31T21:04:30.288Z box:shell Service box-task-7053 finished with exit code 0 9247:2025-08-31T21:04:30.289Z box:tasks startTask: 7053 completed with code 0Questions / Suggestions
- Is syslog the intended log driver for app containers?
Dockerd on my host now runs with --log-driver=journald, but all app containers remain on syslog unless re-created. - Platform-level fix proposals (any/all):
- Migrate app containers to journald on updates/repairs so they inherit the daemon default (no /var/log/syslog involvement).
- Ensure task/backup helpers don’t emit large dumps to stdout (redirect to files/pipes consumed by cloudron-syslog, not rsyslog).
- Ship an rsyslog drop-in that stops Docker-originated container stdout from landing in /var/log/syslog, since Cloudron already captures per-app logs under /home/yellowtent/platformdata/logs/.
This would prevent another GB-scale blow-up when an app emits a lot to stdout during backups or maintenance.What do you think, @nebulon ?
Thanks in advance
- Is syslog the intended log driver for app containers?
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So the docker daemon itself using journald via
--log-driver=journaldis correct. Also it is correct that the containers which are managed and started by Cloudron will havesyslogin theLogConfigof theHostConfig. Also it should mention thesyslog-addressbeingunix://home/yellowtent/platformdata/logs/syslog.sockFrom what I can see in your post this all looks correct and as intended.
Thus, none of the docker containers should log to journald or rsyslogd. Well at least if they were created by Cloudron itself of course to set those.
Given that this is uptime kuma, which in turn is just using sqlite, this lead me to https://git.cloudron.io/platform/box/-/blob/master/src/services.js?ref_type=heads#L933 which indeed starts a container without specifying the cloudron logdriver configs. So that is probably one thing we should fix.
This however would still mean the Gbs of sql dump logs just end up in another place. So the main issue then to fix is that
sqlite3 app.db .dumpwhich is run to create the sqldump also somehow logs to stdout/err despite redirectding stdou to the dump file....and that ends up in the logs somehow. I haven't found a fix yet but just to share the investigation here. -
In the meantime, the problem still persists it seems
root@ubuntu-cloudron-16gb-nbg1-3:~# du -sh /var/log/syslog* 15G /var/log/syslog 26G /var/log/syslog.1 0 /var/log/syslog.1.gz-2025083120.backup 52K /var/log/syslog.2.gz 4.0K /var/log/syslog.3.gz 4.0K /var/log/syslog.4.gzDisk graph shows
docker 25.9 GB docker-volumes 7.79 GB /apps.swap 4.29 GB platformdata 3.77 GB boxdata 58.34 MB maildata 233.47 kB Everything else (Ubuntu, etc) 48.67 GBroot@ubuntu-cloudron-16gb-nbg1-3:~# truncate -s 0 /var/log/syslog root@ubuntu-cloudron-16gb-nbg1-3:~# truncate -s 0 /var/log/syslog.1After truncating the logs (see above), I reclaim the disk space, but I really need to work on a more effective patch / housekeeping job to prevent
This disk contains: docker 25.9 GB docker-volumes 8.02 GB /apps.swap 4.29 GB platformdata 3.8 GB boxdata 57.93 MB maildata 233.47 kB Everything else (Ubuntu, etc) 7.62 GBI would also love if the Cloudron disk usage view would be a graph like for CPU and Memory. Maybe it's already planned for Cloudron 9, otherwise should I mention that idea in a new thread, @nebulon ?
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Hello @SansGuidon
You mean the disk usage as a historical statistic and not only a singular point when checking?
If this is what you mean, no that is not part of Cloudron 9 at the moment.
But in my opinion, a very welcome feature request after Cloudron 9 is released! -
Hello @SansGuidon
You mean the disk usage as a historical statistic and not only a singular point when checking?
If this is what you mean, no that is not part of Cloudron 9 at the moment.
But in my opinion, a very welcome feature request after Cloudron 9 is released!@james said in After Ubuntu 22/24 Upgrade syslog getting spammed and grows way to much clogging up the diskspace:
Hello @SansGuidon
You mean the disk usage as a historical statistic and not only a singular point when checking?
If this is what you mean, no that is not part of Cloudron 9 at the moment.
But in my opinion, a very welcome feature request after Cloudron 9 is released!Exactly, the idea is to be able to notice if something weird is happening (like disk usage growing constantly at a rapid rate)
I'll make a proposal in a separate thread -> Follow up in https://forum.cloudron.io/topic/14292/add-historical-disk-usage-in-system-info-graphs-section -
@SansGuidon afaik, Cloudron does not log anything to syslog . Did you happen to check what was inside that massive syslog file? In one of our production cloudrons (running for almost a decade):
$ du -sh /var/log/syslog* 5.1M /var/log/syslog 6.6M /var/log/syslog.1 800K /var/log/syslog.2.gz 796K /var/log/syslog.3.gz 812K /var/log/syslog.4.gz -
Hi @joseph
root@ubuntu-cloudron-16gb-nbg1-3:~# du -sh /var/log/syslog* 8.2G /var/log/syslog 0 /var/log/syslog.1 0 /var/log/syslog.1.gz-2025083120.backup 52K /var/log/syslog.2.gz 4.0K /var/log/syslog.3.gz 4.0K /var/log/syslog.4.gzAs mentioned earlier in the discussion , it's due to sqlite backup dumps of UptimeKuma which end in the wrong place.
root@ubuntu-cloudron-16gb-nbg1-3:~# grep 'INSERT INTO' /var/log/syslog | wc -l 47237303And I think this was started being investigated by @nebulon
This generates a few GBs worth of waste per day on my Cloudron instance which causes regular outages (every few weeks) -
For now as a workaround I'm applying this patch, please advise if you have any concern with this
diff --git a/box/src/services.js b/box/src/services.js --- a/box/src/services.js +++ b/box/src/services.js @@ -1,7 +1,7 @@ 'use strict'; exports = module.exports = { getServiceConfig, listServices, getServiceStatus, @@ -308,7 +308,7 @@ async function backupSqlite(app, options) { // we use .dump instead of .backup because it's more portable across sqlite versions for (const p of options.paths) { const outputFile = path.join(paths.APPS_DATA_DIR, app.id, path.basename(p, path.extname(p)) + '.sqlite'); // we could use docker exec but it may not work if app is restarting const cmd = `sqlite3 ${p} ".dump"`; const runCmd = `docker run --rm --name=sqlite-${app.id} \ --net cloudron \ -v ${volumeDataDir}:/app/data \ --label isCloudronManaged=true \ - --read-only -v /tmp -v /run ${app.manifest.dockerImage} ${cmd} > ${outputFile}`; + --log-driver=none \ + --read-only -v /tmp -v /run ${app.manifest.dockerImage} ${cmd} > ${outputFile} 2>/dev/null`; await shell.bash(runCmd, { encoding: 'utf8' }); } } -
Hi @joseph
root@ubuntu-cloudron-16gb-nbg1-3:~# du -sh /var/log/syslog* 8.2G /var/log/syslog 0 /var/log/syslog.1 0 /var/log/syslog.1.gz-2025083120.backup 52K /var/log/syslog.2.gz 4.0K /var/log/syslog.3.gz 4.0K /var/log/syslog.4.gzAs mentioned earlier in the discussion , it's due to sqlite backup dumps of UptimeKuma which end in the wrong place.
root@ubuntu-cloudron-16gb-nbg1-3:~# grep 'INSERT INTO' /var/log/syslog | wc -l 47237303And I think this was started being investigated by @nebulon
This generates a few GBs worth of waste per day on my Cloudron instance which causes regular outages (every few weeks)@SansGuidon I think @nebulon investigated and could not reproduce. We also run uptime kuma. Our logs are fine. Have you enabled backups inside uptime kuma or something else by any chance?
root@my:~# docker ps | grep uptime cb00714073cb cloudron/louislam.uptimekuma.app:202508221422060000 "/app/pkg/start.sh" 2 weeks ago Up 2 weeks ee6e4628-c370-4713-9cb6-f1888c32f8fb root@my:~# du -sh /var/log/syslog* 352K /var/log/syslog 904K /var/log/syslog.1 116K /var/log/syslog.2.gz 112K /var/log/syslog.3.gz 112K /var/log/syslog.4.gz 108K /var/log/syslog.5.gz 112K /var/log/syslog.6.gz 108K /var/log/syslog.7.gz root@my:~# grep 'INSERT INTO' /var/log/syslog | wc -l 0 -
FWIW, our db is pretty big too.
@SansGuidon the command is just
sqlite3 ${p} ".dump"and it is redirected to a file. Do you have any ideas of why this will log sql commands to syslog? I can't reproduce this by running the command manually. -
@joseph I don't see any special setting in UptimeKuma being applied in my instance. Can you try to reproduce with those instructions below? Hope that makes sense
Ensure your default logdriver is journald:
systemctl show docker -p ExecStartShould show something like
ExecStart={ path=/usr/bin/dockerd ; argv[]=/usr/bin/dockerd -H fd:// --log-driver=journald --exec-opt native.cgroupdriver=cgroupfs --storage-driver=overlay2 --experimental --ip6tables --use>Then try to mimic what backupSqlite() does (no log driver; redirect only outside docker run):
docker run --rm alpine sh -lc 'for i in $(seq 1 3); do echo "INSERT INTO t VALUES($i);"; done' > /tmp/out.sqlObserve duplicates got logged to syslog anyway:
grep 'INSERT INTO t VALUES' /var/log/syslog | wc -l # > 0 cat /tmp/out.sql | wc -l # same 3 linesNow repeat with logging disabled (what the fix does):
docker run --rm --log-driver=none alpine sh -lc 'for i in $(seq 1 3); do echo "INSERT INTO t VALUES($i);"; done' > /tmp/out2.sql grep 'INSERT INTO t VALUES' /var/log/syslog | wc -l # unchanged
