I have a systemd service. No logs appear from it despite my best efforts. This is the service file:
[Unit]
Description=Load Balancer
[Service]
WorkingDirectory=/home/lb
ExecStart=/usr/lib/jvm/jdk-20/bin/java --enable-preview -jar /home/lb/app.jar
User=lb
Type=simple
Restart=on-failure
RestartSec=10
[Install]
WantedBy=multi-user.target
I've also tried adding
StandardOutput=journal
StandardError=journal
Which did nothing. There are also no messages in /var/log/messages.
The disk is not full:
# df -h
Filesystem Size Used Avail Use% Mounted on
udev 5.9G 0 5.9G 0% /dev
tmpfs 1.2G 624K 1.2G 1% /run
/dev/sda3 293G 3.3G 275G 2% /
tmpfs 5.9G 0 5.9G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
/dev/sda2 2.0G 84M 1.8G 5% /boot
tmpfs 1.2G 0 1.2G 0% /run/user/997
journactl shows nothings:
# journalctl --user -u lb
No journal files were found.
-- No entries --
# journalctl -u lb
-- Journal begins at Sat 2023-05-13 12:59:37 CEST, ends at Sat 2023-05-13 13:46:23 CEST. --
May 13 12:59:59 myserver systemd[1]: lb.service: Main process exited, code=exited, status=143/n/a
May 13 12:59:59 myserver systemd[1]: lb.service: Failed with result 'exit-code'.
May 13 12:59:59 myserver systemd[1]: lb.service: Consumed 3.067s CPU time.
Those failed messages are the only thing I see. They happen when I restart the service.
Just to be on the safe side I rewrote the code to do nothing other than printing some logs:
# /usr/lib/jvm/jdk-20/bin/java -jar app.jar
[LoadBalancer] [2023-05-13 13:51:22] [INFO] Hello, world!
[LoadBalancer] [2023-05-13 13:51:22] [ERROR] Second message is an error
I've run systemctl daemon-reload multiple times.
Stuff is running:
# ps auxf
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.0 167072 11868 ? Ss 2022 67:48 /lib/systemd/systemd --system --deserialize 22
root 3286623 0.0 0.0 220800 5252 ? Ssl Mar26 7:56 /usr/sbin/rsyslogd -n -iNONE
systemd+ 2751434 0.0 0.0 88440 6168 ? Ssl Apr30 0:04 /lib/systemd/systemd-timesyncd
root 2751463 0.0 0.0 21188 4824 ? Ss Apr30 0:02 /lib/systemd/systemd-udevd
root 2814177 0.0 0.0 48316 9240 ? Ss 12:57 0:00 /lib/systemd/systemd-journald
I need to see my logs. Thanks for any help.
EDIT: full output from service lb status (using real code as opposed to the logging statements. Real code prints a started message):
# service lb status
● lb.service - Load Balancer
Loaded: loaded (/etc/systemd/system/lb.service; enabled; vendor preset: enabled)
Active: active (running) since Sat 2023-05-13 17:13:03 CEST; 4s ago
Main PID: 19711 (java)
Tasks: 34 (limit: 14334)
Memory: 75.2M
CPU: 2.907s
CGroup: /system.slice/lb.service
└─19711 /usr/lib/jvm/jdk-20/bin/java --enable-preview -jar /home/lb/app.jar
