Comment # 8 on bug 910933 from Christian Steinruecken

While the patch isn't available via YaST online update yet, the simplest
work-around is to manually edit /usr/lib/systemd/system/canna.service as
follows:

--------------------------------------------------------------
[Unit]
Description=Canna Japanese Conversion Engine

[Service]
Type=forking
ExecPre=/bin/rm -rf /tmp/.iroha_unix
ExecStart=/usr/sbin/cannaserver -s /var/lib/canna/dic
ExecStopPost=/bin/rm -rf /tmp/.iroha_unix

[Install]
WantedBy=multi-user.target
--------------------------------------------------------------

And then executing (as root) the following commands:
# systemctl daemon-reload
# systemctl restart canna.service