Mosquitto install not working ?

[mstormi]

@ecdye see https://community.openhab.org/t/openhabian-mosquitto-mqtt-failed-to-start/102951/86

I was able to reproduce by flashing an image, installing mosquitto from the menu and then reboot. See below for status after reboot. So the reason is /var/log/mosquitto is gone. Manually purged + installed mosquitto again via menu: /var/log/mosquitto is back. Rebooted again, /var/log/mosquitto is gone again.

There's a report this happens with openhab and homegear, too (although I don't trust that statement as it obviously isn't true for openhab) but it's sign of a common zram issue.

Note unlike some other packages we create the systemd config for, the mosquitto package comes with its own mosquitto.service so we would need to sed-edit or replace that OR use the override config as in my post #41 see there for my fix. That is not in our code though.

[14:43:31] root@smarthouse:/home/admin# systemctl start mosquitto
Job for mosquitto.service failed because the control process exited with error code.
See "systemctl status mosquitto.service" and "journalctl -xe" for details.
[13:13:10] root@smarthouse:/home/admin# zramctl
NAME       ALGORITHM DISKSIZE  DATA COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram3 zstd          450M 27.4M  1.2M  1.6M       4 /opt/zram/zram3
/dev/zram2 zstd          350M 16.3M  6.1K  100K       4 /opt/zram/zram2
/dev/zram1 zstd          350M 16.3M  3.7K   68K       4 /opt/zram/zram1
/dev/zram0 lzo-rle       450M    4K   86B   12K       4 [SWAP]

[13:13:01] root@smarthouse:/home/admin# cat /lib/systemd/system/mosquitto.service
[Unit]
Description=Mosquitto MQTT v3.1/v3.1.1 Broker
Documentation=man:mosquitto.conf(5) man:mosquitto(8)
After=network-online.target
Wants=network-online.target

[Service]
Type=notify
NotifyAccess=main
ExecStart=/usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf
Restart=on-failure

[Install]
WantedBy=multi-user.target

[13:13:19] root@smarthouse:/home/admin# /usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf
1623928413: Error: Unable to open log file /var/log/mosquitto/mosquitto.log for writing.
[13:13:33] root@smarthouse:/home/admin# ls -ld /var/log
drwxr-xr-x 1 root root 4096 Jun 17 12:13 /var/log
[13:13:55] root@smarthouse:/home/admin#

[mstormi]

This worked as a post-install fix:

mkdir -p /opt/zram/log.bind/mosquitto
chown mosquitto /opt/zram/log.bind/mosquitto

That's creating the directory on the lowerFS so it's there when zram starts. Do you think that is a proper fix ? Not sure why zram-config.service didn't sync back /var/log/mosquitto.

[mstormi]

I was able to reproduce this for grafana and homegear, too. Same fix applies.

[ecdye]

Sorry for the delayed response, I was out camping with my Family and just got back, I'll try to look at this and the other issues over the weekend and figure out the best solution.

[mstormi]

No worries, there's a life beyond the screen, too. Just returned from my son's vaccination.