Create symlink during install
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Jip-Hop
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README.md
16
README.md
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@ -30,7 +30,7 @@ chmod +x jlmkr.py
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The `jlmkr.py` script (and the jails + config it creates) are now stored on the `jailmaker` dataset and will survive updates of TrueNAS SCALE.
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## Install Jailmaker Dependencies
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### Install Jailmaker Dependencies
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Unfortunately since version 22.12.3 TrueNAS SCALE no longer includes systemd-nspawn. In order to use jailmaker, we need to first install systemd-nspawn using the command below.
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@ -40,38 +40,40 @@ Unfortunately since version 22.12.3 TrueNAS SCALE no longer includes systemd-nsp
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We need to do this again after each update of TrueNAS SCALE. So it is recommended to schedule this command as Post Init Script (see [Autostart Jail on Boot](#autostart-jail-on-boot)).
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Additionally the install command will create a symlink from `/usr/bin/jlmkr` to `jlmkr.py`. Thanks this this you can now run the `jlmkr` command from anywhere (instead of having to run `./jlmkr.py` from inside the directory where you've placed it).
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## Create Jail
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Creating a jail is interactive. You'll be presented with questions which guide you through the process.
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```shell
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./jlmkr.py create myjail
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jlmkr create myjail
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```
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After answering a few questions you should have your first jail up and running!
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### Autostart Jail on Boot
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In order to start a jail automatically after TrueNAS boots, run `/mnt/mypool/jailmaker/jlmkr.py start myjail` as Post Init Script with Type `Command` from the TrueNAS web interface. If you want to automatically install systemd-nspawn if it's not already installed (recommended to keep working after a TrueNAS SCALE update) then you may use a command such as this instead: `/mnt/mypool/jailmaker/jlmkr.py install && /mnt/mypool/jailmaker/jlmkr.py start myjail`.
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In order to start a jail automatically after TrueNAS boots, run `jlmkr start myjail` as Post Init Script with Type `Command` from the TrueNAS web interface. If you want to automatically install systemd-nspawn if it's not already installed (recommended to keep working after a TrueNAS SCALE update) then you may use a command such as this instead: `/mnt/mypool/jailmaker/jlmkr.py install && jlmkr start myjail`.
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## Additional Commands
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### Start Jail
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```shell
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./jlmkr.py start myjail
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jlmkr start myjail
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```
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### List Jails
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```shell
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./jlmkr.py list
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jlmkr list
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```
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### Remove Jail
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```shell
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./jlmkr.py remove myjail
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jlmkr remove myjail
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```
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For additional commands we can use `machinectl`, `systemctl` and `journalctl` directly. The `jlmkr.py` script does not play a role here.
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@ -110,7 +112,7 @@ systemd-run --machine myjail --quiet --pipe --wait --collect --service-type=exec
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## Edit Jail Config
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Once you've created a jail, it will exist in a directory inside the `jails` dir next to `jlmkr.py`. For example `./jails/myjail` if you've named your jail `myjail`. You may edit the jail configuration file. You'll have to stop the jail and start it again with `jlmkr.py` for these changes to take effect.
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Once you've created a jail, it will exist in a directory inside the `jails` dir next to `jlmkr.py`. For example `/mnt/mypool/jailmaker/jails/myjail` if you've named your jail `myjail`. You may edit the jail configuration file. You'll have to stop the jail and start it again with `jlmkr` for these changes to take effect.
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## Networking
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59
jlmkr.py
59
jlmkr.py
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@ -35,7 +35,7 @@ IT COMES WITHOUT WARRANTY AND IS NOT SUPPORTED BY IXSYSTEMS.{NORMAL}"""
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DESCRIPTION = "Create persistent Linux 'jails' on TrueNAS SCALE, with full access to all files \
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via bind mounts, thanks to systemd-nspawn!"
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VERSION = '0.0.6'
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VERSION = '0.0.7'
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JAILS_DIR_PATH = 'jails'
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JAIL_CONFIG_NAME = 'config'
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@ -770,33 +770,44 @@ def list_jails():
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print("\nCurrently running:\n")
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subprocess.run(['machinectl', 'list'])
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def install_jailmaker_dependencies():
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def install_jailmaker():
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# Check if command exists in path
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if shutil.which('systemd-nspawn'):
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print("systemd-nspawn is already installed.")
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return
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else:
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print("Installing jailmaker dependencies...")
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original_permissions = {}
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print("Temporarily enable apt and dpkg (if not already enabled) to install systemd-nspawn.")
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# Make /bin/apt* and /bin/dpkg* files executable
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for file in (glob.glob('/bin/apt*') + (glob.glob('/bin/dpkg*'))):
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original_permissions[file] = os.stat(file).st_mode
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stat_chmod(file, 0o755)
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subprocess.run(['apt-get', 'update'], check=True)
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subprocess.run(['apt-get', 'install', '-y', 'systemd-container'], check=True)
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# Restore original permissions
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print("Restore permissions of apt and dpkg.")
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for file, original_permission in original_permissions.items():
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stat_chmod(file, original_permission)
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print("Installing jailmaker dependencies...")
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target = '/usr/bin/jlmkr'
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original_permissions = {}
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# Check if command exists in path
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if shutil.which('jlmkr'):
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print("The jlmkr command is available.")
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elif not os.path.lexists(target):
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print(f"Creating symlink {target} to {SCRIPT_PATH}.")
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os.symlink(SCRIPT_PATH, target)
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else:
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print(f"File {target} already exists... Maybe it's a broken symlink from a previous install attempt?")
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print(f"Skipped creating new symlink {target} to {SCRIPT_PATH}.")
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print("Temporarily enable apt and dpkg (if not already enabled) to install systemd-nspawn.")
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# Make /bin/apt* and /bin/dpkg* files executable
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for file in (glob.glob('/bin/apt*') + (glob.glob('/bin/dpkg*'))):
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original_permissions[file] = os.stat(file).st_mode
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stat_chmod(file, 0o755)
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subprocess.run(['apt-get', 'update'], check=True)
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subprocess.run(['apt-get', 'install', '-y', 'systemd-container'], check=True)
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# Restore original permissions
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print("Restore permissions of apt and dpkg.")
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for file, original_permission in original_permissions.items():
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stat_chmod(file, original_permission)
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print("Done installing jailmaker dependencies.")
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print("Done installing jailmaker.")
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def main():
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if os.stat(SCRIPT_PATH).st_uid != 0:
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@ -820,7 +831,7 @@ def main():
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subparsers.add_parser(name='list', epilog=DISCLAIMER)
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subparsers.add_parser(name='install', epilog=DISCLAIMER, help="Install jailmaker dependencies")
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subparsers.add_parser(name='install', epilog=DISCLAIMER, help="Install jailmaker dependencies and create symlink")
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if os.getuid() != 0:
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parser.print_usage()
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@ -848,7 +859,7 @@ def main():
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list_jails()
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elif args.subcommand == 'install':
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install_jailmaker_dependencies()
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install_jailmaker()
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elif args.subcommand:
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parser.print_usage()
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