Basic of Systemd
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Systemd is a system and service manager that provides modular, asynchronous, and concurrent services. It allows administrators to create snapshots of unit configurations. Some key capabilities it provides include listing and controlling systemd units and services. A service file template is also provided that defines properties like the service description, execution commands, and installation targets. Systemd-nspawn can be used to create lightweight containers with their own isolated namespaces.
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![Lets Talk about systemd
Name: Praveen Kumar
Contact: kumarpraveen [AT] fedoraproject DOT org
Date: 2015-07-11
1](https://image.slidesharecdn.com/centosmeetup-150709092151-lva1-app6892/85/Basic-of-Systemd-1-320.jpg)
![Service file Template
[Unit]
Description=The Apache HTTP Server
After=network.target remote-fs.target nss-lookup.target
[Service]
Type=notify
Environment=LANG=C
ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND
ExecReload=/usr/sbin/httpd $OPTIONS -k graceful
Service file Template
9](https://image.slidesharecdn.com/centosmeetup-150709092151-lva1-app6892/85/Basic-of-Systemd-8-320.jpg)
![# Send SIGWINCH for graceful stop
KillSignal=SIGWINCH
KillMode=mixed
PrivateTmp=true
[Install]
WantedBy=multi-user.target
Service file Template
10](https://image.slidesharecdn.com/centosmeetup-150709092151-lva1-app6892/85/Basic-of-Systemd-9-320.jpg)
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Basic of Systemd
- 1. Lets Talk about systemd Name: Praveen Kumar Contact: kumarpraveen [AT] fedoraproject DOT org Date: 2015-07-11 1
- 2. Agenda What is systemd What capabilities it provides How to use systemd How a service file looks like Intro about systemd-nspawn Resources Agenda 2
- 3. What is systemd Modular Asynchronous and concurrent Create snapshot features a fully language-agnostic API ... Much more What is systemd 3
- 5. How to use systemd Default init system for CentOS List out units systemctl list-units List out services systemctl list-units --type service systemctl list-units --type service --all How to use systemd 5
- 6. systemctl list-unit-files --type=service ls /usr/lib/systemd/system/*.wants How to use systemd 6
- 7. How to use systemd cont... List out targets systemctl list-units --type targets Check CGroup tree systemd-cgls How to use systemd cont... 7
- 8. Service file Template [Unit] Description=The Apache HTTP Server After=network.target remote-fs.target nss-lookup.target [Service] Type=notify Environment=LANG=C ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND ExecReload=/usr/sbin/httpd $OPTIONS -k graceful Service file Template 9
- 9. # Send SIGWINCH for graceful stop KillSignal=SIGWINCH KillMode=mixed PrivateTmp=true [Install] WantedBy=multi-user.target Service file Template 10
- 10. systemd snapshot Crate a snapshot of existing unit config $ sudo systemctl snapshot test $ sudo systemctl -all list-units | grep test $ sudo systemctl show test $ sudo systemctl isolate test.snapshot $ sudo systemctl delete test systemd snapshot 11
- 11. sysemd-nspawn systemd-nspawn is a small utility which is use to create light weight containers Setup a container $ sudo yum -y --nogpg --releasever=7 --installroot=/srv/mycontaine install systemd passwd yum vim-minimal sysemd-nspawn 12
- 12. sysemd-nspawn cont... Setup container password $ sudo systemd-nspawn -D /srv/mycontainer Start a container $ sudo systemd-nspawn -jbD /srv/mycontainer sysemd-nspawn cont... 13