Linux/Info/Systemd の履歴(No.12)

CentOS7からサービスの管理ががらりと変わった。

timer†

crondの後継

https://rcmdnk.com/blog/2020/10/12/computer-raspberrypi-linux/

serviceファイルとtimerファイルを作成する

/etc/systemd/system/myjob.service

[Unit]
Description = My Job
[Service]
Type = oneshot
ExecStart = /path/to/myjob
[Install]
WantedBy = multi-user.target

/etc/systemd/system/myjob.timer

[Unit]
Description = My Job Timer
[Timer]
OnCalendar =Sun *-*-* 15:06:00
AccuracySec = 1s
[Install]
WantedBy = timers.target

タイマー有効化する

sudo systemctl daemon-reload
sudo systemctl enable myjob.timer
sudo systemctl start myjob.timer

↑

systemctlコマンド†

↑

NW関連†

一覧表示	nmcli d
dns 追加	nmcli connection modify eno16780032 ipv4.dns 192.168.11.1
NW再起動	systemctl restart NetworkManager

↑

主要サービスの再起動†

SSHD	systemctl restart sshd.service
httpd	systemctl restart httpd.service
postgres	systemctl start postgresql.service

↑

サービスの確認†

systemctl status httpd

↑

サービスの有効化†

有効	systemctl enable sshd.service
無効	systemctl disable sshd.service

↑

稼働中サービスの一覧†

systemctl list-units --type=service

↑

自動起動の有無†

systemctl list-unit-files --type=service

↑

firewall†

firewall-cmd --permanent --add-port=任意のポート/tcp

↑

設定の確認†

firewall-cmd --list-all

↑

サービスの追加†

↑

docker-composeをサービス化†

/etc/systemd/system/[email protected]

[Unit]
Description=%i managed by docker-compose
Requires=docker.service
After=docker.service

[Service]
Type=simple

Environment=COMPOSE_FILE=/root/infra/docker/%i/docker-compose.yml

ExecStartPre=-/usr/bin/docker-compose -f ${COMPOSE_FILE} down --volumes
ExecStart=/usr/bin/docker-compose -f ${COMPOSE_FILE} up
ExecStop=/usr/bin/docker-compose -f ${COMPOSE_FILE} down --volumes 

[Install]
WantedBy=multi-user.target

サービス有効化

sudo systemctl enable --now docker-compose-service@mariadb