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https://github.com/AkihiroSuda/containerized-systemd
Dockerfile examples for containerized systemd (mainly for test environments)
https://github.com/AkihiroSuda/containerized-systemd
systemd
Last synced: 3 months ago
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Dockerfile examples for containerized systemd (mainly for test environments)
- Host: GitHub
- URL: https://github.com/AkihiroSuda/containerized-systemd
- Owner: AkihiroSuda
- License: apache-2.0
- Created: 2020-02-10T19:07:16.000Z (almost 5 years ago)
- Default Branch: master
- Last Pushed: 2021-05-21T07:16:51.000Z (over 3 years ago)
- Last Synced: 2024-06-30T14:52:23.065Z (5 months ago)
- Topics: systemd
- Language: Shell
- Homepage: https://github.com/moby/moby/pull/40493
- Size: 25.4 KB
- Stars: 116
- Watchers: 6
- Forks: 17
- Open Issues: 5
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# Dockerfile examples for containerized systemd (mainly for test environments)
* `Dockerfile.archlinux`: Arch Linux (systemd 247, as of Feb 2021)
* `Dockerfile.centos-8.3`: CentOS 8.3 (systemd 239)
* `Dockerfile.debian-10`: Debian GNU/Linux 10 (systemd 241)
* `Dockerfile.fedora-33`: Fedora 33 (systemd 246)
* `Dockerfile.opensuse-tumbleweed`: openSUSE Tumbleweed (systemd 246, as of Feb 2021)
* `Dockerfile.ubuntu-20.04`: Ubuntu 20.04 (systemd 245)
## Demo 1: interactive shell with `systemctl`
* The command (`/bin/bash`) specified as the argument of `docker run` is executed as the foreground job in the container.
* Workdir (`--workdir /usr`) is propagated
* Env vars (`-e FOO=hello`) are propagated
* The container shuts down when the command exits. The exit status code (`42`) is propagated.
```console
host$ docker build -t foo -f Dockerfile.debian-10 .
host$ docker run -it --rm --privileged --workdir /usr -e FOO=hello foo /bin/bash
Created symlink /etc/systemd/system/docker-entrypoint.target.wants/docker-entrypoint.service → /etc/systemd/system/docker-entrypoint.service.
Created symlink /etc/systemd/system/systemd-firstboot.service → /dev/null.
Created symlink /etc/systemd/system/systemd-udevd.service → /dev/null.
/docker-entrypoint.sh: starting /lib/systemd/systemd --show-status=false --unit=docker-entrypoint.target
systemd 241 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid)
Detected virtualization docker.
Detected architecture x86-64.
Set hostname to <4608072355e2>.
+ /bin/bash
root@4608072355e2:/usr# systemctl status
● 4608072355e2
State: running
Jobs: 0 queued
Failed: 0 units
Since: Mon 2020-02-10 21:41:37 UTC; 3s ago
CGroup: /system.slice/docker-4608072355e222fd25bdfa4b74e48c3f087f4d8128814a29d4035e7a8e42a364.scope
├─init.scope
│ └─1 /lib/systemd/systemd --show-status=false --unit=docker-entrypoint.target
└─system.slice
├─systemd-journald.service
│ └─26 /lib/systemd/systemd-journald
└─docker-entrypoint.service
├─38 /bin/sh -xec /bin/bash
├─39 /bin/bash
├─40 systemctl status
└─41 pager
root@4608072355e2:/usr# pwd
/usr
root@4608072355e2:/usr# echo $FOO
hello
root@4608072355e2:/usr# exit 42
exit
host$ echo $?
42
```
## Demo 2: `journalctl -f`
```console
host$ docker run -it --rm --privileged foo journalctl -f
Created symlink /etc/systemd/system/docker-entrypoint.target.wants/docker-entrypoint.service → /etc/systemd/system/docker-entrypoint.service.
Created symlink /etc/systemd/system/systemd-firstboot.service → /dev/null.
Created symlink /etc/systemd/system/systemd-udevd.service → /dev/null.
/docker-entrypoint.sh: starting /lib/systemd/systemd --show-status=false --unit=docker-entrypoint.target
systemd 241 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid)
Detected virtualization docker.
Detected architecture x86-64.
Set hostname to <827af95def7e>.
+ journalctl -f
-- Logs begin at Wed 2020-02-12 06:20:22 UTC. --
Feb 12 06:20:22 827af95def7e systemd[1]: Started Flush Journal to Persistent Storage.
Feb 12 06:20:22 827af95def7e systemd[1]: Starting Create Volatile Files and Directories...
Feb 12 06:20:22 827af95def7e systemd[1]: Started Create Volatile Files and Directories.
Feb 12 06:20:22 827af95def7e systemd[1]: Condition check resulted in Network Time Synchronization being skipped.
Feb 12 06:20:22 827af95def7e systemd[1]: Reached target System Time Synchronized.
Feb 12 06:20:22 827af95def7e systemd[1]: Starting Update UTMP about System Boot/Shutdown...
Feb 12 06:20:22 827af95def7e systemd[1]: Started Update UTMP about System Boot/Shutdown.
Feb 12 06:20:22 827af95def7e systemd[1]: Reached target System Initialization.
Feb 12 06:20:22 827af95def7e systemd[1]: Started docker-entrypoint.service (journalctl -f).
Feb 12 06:20:22 827af95def7e systemd[1]: Startup finished in 410ms.
^Cgot signal INT
host$ echo $?
130
```
## Bugs
* `docker run` needs `-t`