Re: [systemd-devel] Append to logfile with year-month
On Do, 24.08.23 09:48, Cecil Westerhof (cldwester...@gmail.com) wrote: > In a service file I can use: > StandardOutput=append:/var/log/root/aptCacheUsage.log > > but I want to use something like: > StandardOutput=append:/var/log/root/aptCacheUsage_$(date +%%Y-%%m).log > > Did does not work, because this puts it in: > /var/log/root/aptCacheUsage_$(date +%Y-%m).log > > Is there a way I can put it in: > /var/log/root/aptCacheUsage_2023-08.log > > while it would automatically next month go into: >/var/log/root/aptCacheUsage_2023-09.log > > I could of-course put it into: > /var/log/root/aptCacheUsage.log > > and at the beginning of the month move it if it exists with a timed > service, but I really would not like that kind of solution. We do not support this. systemd supports evaluating some specifiers, but time/date is not one of them, in particular as we resolve specifiers at parse time of the unit only, not afterwards. or in other words: we'd resolve the specifiers early at boot, and that doesn't look like what you want. Also, for long-running services this wouldn#t work anyway, as we can't rotate files like that, because we cannot externally close the current stdout of a process and replace it with a new file. hence, what you are trying to do is not supported, and is unlikely to ever be supported for multiple reasons. sorry! Lennart -- Lennart Poettering, Berlin
Re: [systemd-devel] Append to logfile with year-month
Consider the ugly ExecStart=bash -c "whatever > /var/log/root/aptCacheUsage_$(date +%%Y-%%m).log 2>&1" or ExecStart=bash -c "whatever | cronolog /var/log/root/aptCacheUsage_%%Y-%%m.log 2>&1" Best Donald On 8/24/23 9:48 AM, Cecil Westerhof wrote: > In a service file I can use: > StandardOutput=append:/var/log/root/aptCacheUsage.log > > but I want to use something like: > StandardOutput=append:/var/log/root/aptCacheUsage_$(date +%%Y-%%m).log > > Did does not work, because this puts it in: > /var/log/root/aptCacheUsage_$(date +%Y-%m).log > > Is there a way I can put it in: > /var/log/root/aptCacheUsage_2023-08.log > > while it would automatically next month go into: > /var/log/root/aptCacheUsage_2023-09.log > > I could of-course put it into: > /var/log/root/aptCacheUsage.log > > and at the beginning of the month move it if it exists with a timed service, > but I really would not like that kind of solution. > > -- > Cecil Westerhof -- Donald Buczek buc...@molgen.mpg.de Tel: +49 30 8413 1433
Re: [systemd-devel] Append to logfile with year-month
On Thu, Aug 24, 2023 at 10:49 AM Cecil Westerhof wrote: > In a service file I can use: > StandardOutput=append:/var/log/root/aptCacheUsage.log > > but I want to use something like: > StandardOutput=append:/var/log/root/aptCacheUsage_$(date +%%Y-%%m).log > > Did does not work, because this puts it in: > /var/log/root/aptCacheUsage_$(date +%Y-%m).log > > Is there a way I can put it in: > /var/log/root/aptCacheUsage_2023-08.log > > while it would automatically next month go into: >/var/log/root/aptCacheUsage_2023-09.log > > Not with built-in systemd tools. If it's a periodic (not permanently running) service, best you can do is script a monthly cronjob that automatically edits the StandardOutput line in your .service unit. > I could of-course put it into: > /var/log/root/aptCacheUsage.log > > and at the beginning of the month move it if it exists with a timed > service, but I really would not like that kind of solution. > It's called /etc/logrotate.conf and it's what everyone else does. It's what Debian/Ubuntu itself uses for /var/log/apt*.log and such. -- Mantas Mikulėnas
[systemd-devel] Append to logfile with year-month
In a service file I can use: StandardOutput=append:/var/log/root/aptCacheUsage.log but I want to use something like: StandardOutput=append:/var/log/root/aptCacheUsage_$(date +%%Y-%%m).log Did does not work, because this puts it in: /var/log/root/aptCacheUsage_$(date +%Y-%m).log Is there a way I can put it in: /var/log/root/aptCacheUsage_2023-08.log while it would automatically next month go into: /var/log/root/aptCacheUsage_2023-09.log I could of-course put it into: /var/log/root/aptCacheUsage.log and at the beginning of the month move it if it exists with a timed service, but I really would not like that kind of solution. -- Cecil Westerhof
