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systemd.network(5) get a value from file, or environment?

systemd: default value for environment variableHow can I make my user services wait till the network is online?Set environment variable for all services running under systemdDynamic variables in systemd service unit filesPrevent a system service from starting of another specified unit is activePass an environment variable from current shell to a systemd unitHow does systemd stop services that don't have a unit filePassing environment variables around in systemdIs it possible to have a drop-in file for templates?How to protect an EnvironmentFile used by a systemd service?

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

1

I know that *.service units support Environment=key=val and EnvironmentFile=fname entries, but it appears that *.network files don't.

Is there any other way of getting, the value of an Address specifically, in from a different file or environment variable?

e.g. the result would be like:

# /etc/some/conf

192.0.2.3

# some.network

[Match]

Name=some



[Network]

# (! invalid !) example of desired effect

Address=$(cat /etc/some/conf)

systemd systemd-networkd

share|improve this question

edited 11 mins ago

OJFord

asked 42 mins ago

OJFordOJFord

66111 gold badge66 silver badges1616 bronze badges

add a comment | 

1

I know that *.service units support Environment=key=val and EnvironmentFile=fname entries, but it appears that *.network files don't.

Is there any other way of getting, the value of an Address specifically, in from a different file or environment variable?

e.g. the result would be like:

# /etc/some/conf

192.0.2.3

# some.network

[Match]

Name=some



[Network]

# (! invalid !) example of desired effect

Address=$(cat /etc/some/conf)

systemd systemd-networkd

share|improve this question

edited 11 mins ago

OJFord

asked 42 mins ago

OJFordOJFord

66111 gold badge66 silver badges1616 bronze badges

add a comment | 

I know that *.service units support Environment=key=val and EnvironmentFile=fname entries, but it appears that *.network files don't.

Is there any other way of getting, the value of an Address specifically, in from a different file or environment variable?

e.g. the result would be like:

# /etc/some/conf

192.0.2.3

# some.network

[Match]

Name=some



[Network]

# (! invalid !) example of desired effect

Address=$(cat /etc/some/conf)

systemd systemd-networkd

share|improve this question

edited 11 mins ago

OJFord

asked 42 mins ago

OJFordOJFord

66111 gold badge66 silver badges1616 bronze badges

# /etc/some/conf

192.0.2.3

# some.network

[Match]

Name=some



[Network]

# (! invalid !) example of desired effect

Address=$(cat /etc/some/conf)

share|improve this question

edited 11 mins ago

OJFord

asked 42 mins ago

OJFordOJFord

66111 gold badge66 silver badges1616 bronze badges

share|improve this question

edited 11 mins ago

OJFord

asked 42 mins ago

OJFordOJFord

66111 gold badge66 silver badges1616 bronze badges

asked 42 mins ago

OJFordOJFord

66111 gold badge66 silver badges1616 bronze badges

asked 42 mins ago

OJFordOJFord

66111 gold badge66 silver badges1616 bronze badges

1 Answer
1

active

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0

From systemd.network man:

The .network files are read from the files located in the system
network directories /usr/lib/systemd/network and
/usr/local/lib/systemd/network, the volatile runtime network directory
/run/systemd/network and the local administration network directory
/etc/systemd/network. All configuration files are collectively sorted
and processed in lexical order, regardless of the directories in which
they live. However, files with identical filenames replace each other.
Files in /etc have the highest priority, files in /run take precedence
over files with the same name under /usr. This can be used to override
a system-supplied configuration file with a local file if needed. As a
special case, an empty file (file size 0) or symlink with the same
name pointing to /dev/null disables the configuration file entirely
(it is "masked").

[...]

An "[Address]" section accepts the following keys. Specify several
"[Address]" sections to configure several addresses.

share|improve this answer

answered 31 mins ago

BartBart

52611 silver badge1414 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry, I think I might not have been clear: I know I can put several .network files in multiple locations, but I want just one, that loads its address from either a file that contains only an IP address (no knowledge that it's going into a systemd file), or an env var. I've edited OP to make that clearer.
  
  – OJFord
  15 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  what about the Address section I've mentioned? according to man, you can specify many IP addresses there..
  
  – Bart
  10 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @OJFord , an example of such configuration here: superuser.com/a/775900/1049376
  
  – Bart
  7 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm not looking to specify many, just to specify one that's defined elsewhere.
  
  – OJFord
  2 mins ago
  

  
  
  
  

add a comment | 

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0

From systemd.network man:

The .network files are read from the files located in the system
network directories /usr/lib/systemd/network and
/usr/local/lib/systemd/network, the volatile runtime network directory
/run/systemd/network and the local administration network directory
/etc/systemd/network. All configuration files are collectively sorted
and processed in lexical order, regardless of the directories in which
they live. However, files with identical filenames replace each other.
Files in /etc have the highest priority, files in /run take precedence
over files with the same name under /usr. This can be used to override
a system-supplied configuration file with a local file if needed. As a
special case, an empty file (file size 0) or symlink with the same
name pointing to /dev/null disables the configuration file entirely
(it is "masked").

[...]

An "[Address]" section accepts the following keys. Specify several
"[Address]" sections to configure several addresses.

share|improve this answer

answered 31 mins ago

BartBart

52611 silver badge1414 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry, I think I might not have been clear: I know I can put several .network files in multiple locations, but I want just one, that loads its address from either a file that contains only an IP address (no knowledge that it's going into a systemd file), or an env var. I've edited OP to make that clearer.
  
  – OJFord
  15 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  what about the Address section I've mentioned? according to man, you can specify many IP addresses there..
  
  – Bart
  10 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @OJFord , an example of such configuration here: superuser.com/a/775900/1049376
  
  – Bart
  7 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm not looking to specify many, just to specify one that's defined elsewhere.
  
  – OJFord
  2 mins ago
  

  
  
  
  

add a comment | 

0

From systemd.network man:

The .network files are read from the files located in the system
network directories /usr/lib/systemd/network and
/usr/local/lib/systemd/network, the volatile runtime network directory
/run/systemd/network and the local administration network directory
/etc/systemd/network. All configuration files are collectively sorted
and processed in lexical order, regardless of the directories in which
they live. However, files with identical filenames replace each other.
Files in /etc have the highest priority, files in /run take precedence
over files with the same name under /usr. This can be used to override
a system-supplied configuration file with a local file if needed. As a
special case, an empty file (file size 0) or symlink with the same
name pointing to /dev/null disables the configuration file entirely
(it is "masked").

[...]

An "[Address]" section accepts the following keys. Specify several
"[Address]" sections to configure several addresses.

share|improve this answer

answered 31 mins ago

BartBart

52611 silver badge1414 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Sorry, I think I might not have been clear: I know I can put several .network files in multiple locations, but I want just one, that loads its address from either a file that contains only an IP address (no knowledge that it's going into a systemd file), or an env var. I've edited OP to make that clearer.
  
  – OJFord
  15 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  what about the Address section I've mentioned? according to man, you can specify many IP addresses there..
  
  – Bart
  10 mins ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @OJFord , an example of such configuration here: superuser.com/a/775900/1049376
  
  – Bart
  7 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm not looking to specify many, just to specify one that's defined elsewhere.
  
  – OJFord
  2 mins ago
  

  
  
  
  

add a comment | 

From systemd.network man:

The .network files are read from the files located in the system
network directories /usr/lib/systemd/network and
/usr/local/lib/systemd/network, the volatile runtime network directory
/run/systemd/network and the local administration network directory
/etc/systemd/network. All configuration files are collectively sorted
and processed in lexical order, regardless of the directories in which
they live. However, files with identical filenames replace each other.
Files in /etc have the highest priority, files in /run take precedence
over files with the same name under /usr. This can be used to override
a system-supplied configuration file with a local file if needed. As a
special case, an empty file (file size 0) or symlink with the same
name pointing to /dev/null disables the configuration file entirely
(it is "masked").

[...]

An "[Address]" section accepts the following keys. Specify several
"[Address]" sections to configure several addresses.

share|improve this answer

answered 31 mins ago

BartBart

52611 silver badge1414 bronze badges

share|improve this answer

answered 31 mins ago

BartBart

52611 silver badge1414 bronze badges

answered 31 mins ago

BartBart

52611 silver badge1414 bronze badges

answered 31 mins ago

BartBart

52611 silver badge1414 bronze badges