[systemd-devel] Journal file is synced each minute into disk

[Andrei Borzenkov]

09.05.2016 18:21, Ricardo Fraile пишет:
> Hello,
> 
> 
> With the following configuration in "/etc/systemd/journald.conf":
> 
> [Journal]
> Seal=no
> SplitMode=none
> SyncIntervalSec=5m
> RateLimitInterval=0
> RateLimitBurst=0
> ForwardToSyslog=no
> 
> SystemMaxUse=5G
> SystemKeepFree=500M
> 
> RuntimeMaxUse=500M
> RuntimeKeepFree=250M
> 
> 
> 
> The file "system.journal" located under "/var/log/journal/[number]/" is
> synced each minute, for example:
> 
> # ls -al
> -rw-r----- 1 root root 8388608 May  9 17:05 system.journal
> 
> # ls -al
> -rw-r----- 1 root root 8388608 May  9 17:06 system.journal
> 
> 

It has nothing to do with sync to disk; it simply shows file
modification time which is kept in memory as well. Are there any new
messages in this minute?

> 
> But its extrange since the variable "SyncIntervalSec" have the "5m"
> value and the man page said:
> 
> SyncIntervalSec=
> The timeout before synchronizing journal files to disk. After syncing,
> journal files are placed in the OFFLINE state. Note that syncing is
> unconditionally done immediately after a log message of priority CRIT,
> ALERT or EMERG has been logged. This setting hence applies only to
> messages of the levels ERR, WARNING, NOTICE, INFO, DEBUG. The default
> timeout is 5 minutes.
> 
> 
> Ok, maybe any important error is generated, but is not the case, the
> journal didn't report anything:
> 
> # journalctl -p crit -p alert -p emerg
> -- Logs begin at Mon 2016-05-09 15:51:12 CEST, end at Mon 2016-05-09
> 17:12:54 CEST. --
> 
> 
> Is this the right behaviour?
> 
> How is possible to delay the sync of the persistent journal file?
> 
> 
> # systemd --version
> systemd 215
> +PAM +AUDIT +SELINUX +IMA +SYSVINIT +LIBCRYPTSETUP +GCRYPT +ACL +XZ
> -SECCOMP -APPARMOR
> ...runing in Debian Jessie 8.4
> 
> Thanks,
> 
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