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--- rh124_systemd [2026/10/20 16:15] – created rpjday
+++ rh124_systemd [2026/10/30 10:19] (current) – [More] rpjday
@@ Line 1: / Line 1: @@
-====== RH1245 systemd ======
+====== RH124 systemd ======
 ===== Links =====
-  * [[https://systemd.io/|System and Service Manager]]
+  * [[https://systemd.io/]]
-  * [[https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/10/html/using_systemd_unit_files_to_customize_and_optimize_your_system/index|Using systemd unit files to customize and optimize your system]]
+  * [[https://www.freedesktop.org/software/systemd/man/latest/systemd.html]]
+  * [[https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/10/html/using_systemd_unit_files_to_customize_and_optimize_your_system/index]]
+===== systemd packages =====
+<code>
+$ rpm -qa "*systemd*"
+systemd-libs-257-23.el10_2.1.alma.1.x86_64
+rpm-plugin-systemd-inhibit-4.19.1.1-23.el10.alma.1.x86_64
+systemd-pam-257-23.el10_2.1.alma.1.x86_64
+systemd-257-23.el10_2.1.alma.1.x86_64
+python3-systemd-235-11.el10.x86_64
+systemd-udev-257-23.el10_2.1.alma.1.x86_64
+$
+</code>
+===== Start, stop and status check =====
+<code>
+$ systemctl status sshd.service
+$ sudo systemctl stop sshd.service
+$ sudo systemctl start sshd.service
+</code>
+===== Enable and disable =====
+<code>
+$ systemctl disable sshd.service
+$ systemctl enable sshd.service
+</code>
+===== /usr/lib/systemd/system/sshd.service =====
+<code>
+[Unit]
+Description=OpenSSH server daemon
+Documentation=man:sshd(8) man:sshd_config(5)
+After=network.target sshd-keygen.target
+Wants=sshd-keygen.target
+# Migration for Fedora 38 change to remove group ownership for standard host keys
+# See https://fedoraproject.org/wiki/Changes/SSHKeySignSuidBit
+Wants=ssh-host-keys-migration.service
+[Service]
+Type=notify
+EnvironmentFile=-/etc/sysconfig/sshd
+ExecStart=/usr/sbin/sshd -D $OPTIONS
+ExecReload=/bin/kill -HUP $MAINPID
+KillMode=process
+Restart=on-failure
+RestartSec=42s
+[Install]
+WantedBy=multi-user.target
+</code>
+===== More =====
+<code>
+$ systemctl --type help
+$ systemctl list-units --type=target
+$ systemctl get-default
+</code>
+How to add a "drop-in" ''override.conf'':
+<code>
+$ systemctl edit sshd.service
+</code>