Limit log file size?

Node Operators FAQ
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1

i used search and did not find anything helpful…

how can i limit the log file size? it was 7GB (on an old RPI 2 with 32GB SD Card)
for now i changed log level to fatal about same as no log but that is not optimal… also would be nice to write the log file to RAM

2

You can search the forum using keyword “log rotate” or click the tag under the title.

3

i think i know log rotate from rsyslog but that does not work for docker does it?

4

If you redirected logs to the file, the logrotate will work the same way, as for regular services.
If you didn’t - you may specify the internal log limits and rotation with options

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5

thanks just for info maybe it helps someone:
i did now use the 2 --log commands u told me and i made a ramdisk in /store/ram (with mount -t tmpfs -o size=1024m myramdisk /store/ram/)

in config.yaml i set the log path to log.output: "/app/config/ram/node.log"

looks like its working fine and if the “–log-opt max-size=10m” works with 5 files max the ram disk should never get more than ~50MB… maybe 1GB was too much but no problem, switched from RPI to old PC with 16GB RAM

6

too bad that is not working:

root@store:/store/ram# ll -h
total 12M
drwxrwxrwt 2 root root   60 May 22 12:53 ./
drwxr-xr-x 5 root root 4.0K May 22 14:53 ../
-rw-r--r-- 1 root root  12M May 22 15:01 node.log

log is 12 MB already and i did use --log-opt max-size=10m

7

you can create a /etc/docker/daemon.json

here are the options I got on mine

{
  "log-driver": "local",
  "log-opts": {
    "max-size": "10m",
    "max-file": "15"
  },
  "shutdown-timeout": 300,
  "live-restore": true
}
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8

thanks, in the meantime i made a cronjob that emptys the logfile once per day

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9

the docker’s options --log-opt working only if you do not redirect logs.
If you redirected logs - you need to use a logrotate or similar script to rotate them yourself. In case of RAM like you used it - it’s not possible at all.
If you want to reduce a verbosity you may set the log level to error instead of info.

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