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systemd: myservice.service vs myservice.target

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0

In a systemd service definition file, what is the difference between

[Unit]
Description=My service...
After=zookeeper.service

and

[Unit]
Description=My service...
After=zookeeper.target

zookeeper is another service defined in another service file, but what is the significance of the extension .service vs .target. Is there a difference?

systemd

share|improve this question

asked Apr 18 '18 at 18:20

clayclay

1085

add a comment | 

0

In a systemd service definition file, what is the difference between

[Unit]
Description=My service...
After=zookeeper.service

and

[Unit]
Description=My service...
After=zookeeper.target

zookeeper is another service defined in another service file, but what is the significance of the extension .service vs .target. Is there a difference?

systemd

share|improve this question

asked Apr 18 '18 at 18:20

clayclay

1085

add a comment | 

In a systemd service definition file, what is the difference between

[Unit]
Description=My service...
After=zookeeper.service

and

[Unit]
Description=My service...
After=zookeeper.target

zookeeper is another service defined in another service file, but what is the significance of the extension .service vs .target. Is there a difference?

systemd

share|improve this question

asked Apr 18 '18 at 18:20

clayclay

1085

[Unit]
Description=My service...
After=zookeeper.service

[Unit]
Description=My service...
After=zookeeper.target

share|improve this question

asked Apr 18 '18 at 18:20

clayclay

1085

share|improve this question

asked Apr 18 '18 at 18:20

clayclay

1085

asked Apr 18 '18 at 18:20

clayclay

1085

asked Apr 18 '18 at 18:20

clayclay

1085

2 Answers
2

active

oldest

votes

0

Yes. See man systemd.service and man systemd.target for the documentation for each type of systemd unit.

On your systemd, you can find the files and review what systemd directives they contain, assuming both exist:

 locate zookeeper.service
 locate zookeeper.target

share|improve this answer

answered Apr 18 '18 at 18:28

Mark StosbergMark Stosberg

2,8211324

add a comment | 

2

A service:

A unit configuration file whose name ends in .service encodes
information about a process controlled and supervised by systemd.

A target:

A unit configuration file whose name ends in ".target" encodes
information about a target unit of systemd, which is used for grouping
units and as well-known synchronization points during start-up.

These both refer to unit configuration files, which are:

A unit configuration file encodes information about a service, a
socket, a device, a mount point, an automount point, a swap file or
partition, a start-up target, a watched file system path, a timer
controlled and supervised by systemd(1), a resource management slice
or a group of externally created processes.

Reference: man pages for systemd.service, systemd.target, and systemd.unit, respectively.

Also, with respect to the configuration files themselves; services need:

Service files must include a "[Service]" section, which carries
information about the service and the process it supervises.

No such requirement exists for target configuration files. In fact, targets have no options specific to targets; items are configured in generic [Unit] and [Install] sections.

share|improve this answer

edited Apr 30 at 20:38

answered Apr 30 at 20:32

fbicknelfbicknel

1214

add a comment | 

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0

Yes. See man systemd.service and man systemd.target for the documentation for each type of systemd unit.

On your systemd, you can find the files and review what systemd directives they contain, assuming both exist:

 locate zookeeper.service
 locate zookeeper.target

share|improve this answer

answered Apr 18 '18 at 18:28

Mark StosbergMark Stosberg

2,8211324

add a comment | 

0

Yes. See man systemd.service and man systemd.target for the documentation for each type of systemd unit.

On your systemd, you can find the files and review what systemd directives they contain, assuming both exist:

 locate zookeeper.service
 locate zookeeper.target

share|improve this answer

answered Apr 18 '18 at 18:28

Mark StosbergMark Stosberg

2,8211324

add a comment | 

Yes. See man systemd.service and man systemd.target for the documentation for each type of systemd unit.

On your systemd, you can find the files and review what systemd directives they contain, assuming both exist:

 locate zookeeper.service
 locate zookeeper.target

share|improve this answer

answered Apr 18 '18 at 18:28

Mark StosbergMark Stosberg

2,8211324

 locate zookeeper.service
 locate zookeeper.target

share|improve this answer

answered Apr 18 '18 at 18:28

Mark StosbergMark Stosberg

2,8211324

answered Apr 18 '18 at 18:28

Mark StosbergMark Stosberg

2,8211324

answered Apr 18 '18 at 18:28

Mark StosbergMark Stosberg

2,8211324

2

A service:

A unit configuration file whose name ends in .service encodes
information about a process controlled and supervised by systemd.

A target:

A unit configuration file whose name ends in ".target" encodes
information about a target unit of systemd, which is used for grouping
units and as well-known synchronization points during start-up.

These both refer to unit configuration files, which are:

A unit configuration file encodes information about a service, a
socket, a device, a mount point, an automount point, a swap file or
partition, a start-up target, a watched file system path, a timer
controlled and supervised by systemd(1), a resource management slice
or a group of externally created processes.

Reference: man pages for systemd.service, systemd.target, and systemd.unit, respectively.

Also, with respect to the configuration files themselves; services need:

Service files must include a "[Service]" section, which carries
information about the service and the process it supervises.

No such requirement exists for target configuration files. In fact, targets have no options specific to targets; items are configured in generic [Unit] and [Install] sections.

share|improve this answer

edited Apr 30 at 20:38

answered Apr 30 at 20:32

fbicknelfbicknel

1214

add a comment | 

2

A service:

A unit configuration file whose name ends in .service encodes
information about a process controlled and supervised by systemd.

A target:

A unit configuration file whose name ends in ".target" encodes
information about a target unit of systemd, which is used for grouping
units and as well-known synchronization points during start-up.

These both refer to unit configuration files, which are:

A unit configuration file encodes information about a service, a
socket, a device, a mount point, an automount point, a swap file or
partition, a start-up target, a watched file system path, a timer
controlled and supervised by systemd(1), a resource management slice
or a group of externally created processes.

Reference: man pages for systemd.service, systemd.target, and systemd.unit, respectively.

Also, with respect to the configuration files themselves; services need:

Service files must include a "[Service]" section, which carries
information about the service and the process it supervises.

No such requirement exists for target configuration files. In fact, targets have no options specific to targets; items are configured in generic [Unit] and [Install] sections.

share|improve this answer

edited Apr 30 at 20:38

answered Apr 30 at 20:32

fbicknelfbicknel

1214

add a comment | 

A service:

A unit configuration file whose name ends in .service encodes
information about a process controlled and supervised by systemd.

A target:

A unit configuration file whose name ends in ".target" encodes
information about a target unit of systemd, which is used for grouping
units and as well-known synchronization points during start-up.

These both refer to unit configuration files, which are:

A unit configuration file encodes information about a service, a
socket, a device, a mount point, an automount point, a swap file or
partition, a start-up target, a watched file system path, a timer
controlled and supervised by systemd(1), a resource management slice
or a group of externally created processes.

Reference: man pages for systemd.service, systemd.target, and systemd.unit, respectively.

Also, with respect to the configuration files themselves; services need:

Service files must include a "[Service]" section, which carries
information about the service and the process it supervises.

No such requirement exists for target configuration files. In fact, targets have no options specific to targets; items are configured in generic [Unit] and [Install] sections.

share|improve this answer

edited Apr 30 at 20:38

answered Apr 30 at 20:32

fbicknelfbicknel

1214

share|improve this answer

edited Apr 30 at 20:38

answered Apr 30 at 20:32

fbicknelfbicknel

1214

answered Apr 30 at 20:32

fbicknelfbicknel

1214

answered Apr 30 at 20:32

fbicknelfbicknel

1214