I'm tailing logs of my own app and postgres.
tail -f /tmp/myapp.log /var/log/postgresql/postgresql.main.log
I need to include pgpool's logs. It used to be syslog but now it is in journalctl.
Is there a way to tie tail -f && journalctl -f together?
You could use:
journalctl -u service-name -f
-f, --follow
Show only the most recent journal entries, and continuously print new entries as they are appended to the journal.
Here I've added "service-name" to distinguish this answer from others; you substitute the actual service name instead of the text service-name.
You could forward your log entries to journal:
systemd-cat tail -f /tmp/myapp.log /var/log/postgresql.log
and then use journalctl -f... though as Mark mentioned, that will print all journal entries.
One way to filter only the messages from those logs and from that particular unit is to use a distinct SYSLOG_IDENTIFIER i.e. edit the unit file and under the [Service] section add e.g.
SyslogIdentifier=my_stuff
restart the unit then run systemd-cat with the same identifier
systemd-cat -t my_stuff tail -f /tmp/myapp.log /var/log/postgresql.log
and finally query the journal only for that particular identifier:
journalctl -f -t my_stuff
If you have bash available, you can use process substitution as one of the tail parameters:
tail -f /tmp/myapp.log /var/log/postgresql/postgresql.main.log <(journalctl -f)
try something like:
tail -f /tmp/myapp.log >> /tmp/tail.log &
journalctl -f >> /tmp/tail.log &
tail -f /tmp/tail.log
Using journaltail:
journaltail --unit pgpool.service /tmp/myapp.log /var/log/postgresql/postgresql.main.log
I just threw the script together an hour ago after looking for a solution at stackoverflow et al.
