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mydns.jpのIPアドレス通知自動

1. service の作成

/etc/systemd/system/mydns_update.service

[Unit]
Description=mydns_update

[Service]
Type=simple
ExecStart=/usr/local/bin/mydns-update

2. timer の作成

/etc/systemd/system/mydns_update.timer

[Unit]
Description=mydns_update.Timer

[Timer]
# これは10分ごとに更新させるように設定したもの
OnCalendar=*:0/10
Unit=mydns_update.service

[Install]
WantedBy=timers.target

3. サービス起動と自動起動の設定

[root@server]# systemctl enable mydns_update.timer

[root@server]# systemctl start mydns_update.timer

4. 動作の確認

[root@server]# systemctl list-timers
NEXT                        LEFT        LAST                        PASSED        UNIT                         ACTIVATES
Tue 2020-11-17 16:50:00 JST 9min left   Tue 2020-11-17 16:40:02 JST 24s ago       mydns_update.timer           mydns_update.service
Tue 2020-11-17 16:54:47 JST 14min left  Tue 2020-11-17 14:56:13 JST 1h 44min ago  dnf-makecache.timer          dnf-makecache.service
Wed 2020-11-18 06:25:33 JST 13h left    Tue 2020-11-17 06:23:07 JST 10h ago       dnf-automatic.timer          dnf-automatic.service

			※ 途中省略

Pass --all to see loaded but inactive timers, too.