Short answer:
bad : It shows Systemd Unit files enablement status - you will see this sort of message on systems which use
systemd
you can check the enablement status using command:
sudo systemctl is-enabled <unit-name>
if that unit file is a native systemd service then it will give output enabled, disabled, etc. If it is not a native systemd service then it will give report a message like.
sudo systemctl is-enabled apache2
apache2.service is not a native service, redirecting to systemd-sysv-install
Executing /lib/systemd/systemd-sysv-install is-enabled apache2
enabled
but with command :
systemctl status apache2
or
service apache2 status
it gives status bad. (maybe it is because it is not able to print a complete message or developer decided to print bad)
Long Answer:
what are system unit files ?
Units are the objects that systemd knows how to manage. These are basically a standardized representation of system resources that can be managed by the suite of daemons and manipulated by the provided utilities. It can be used to abstract services, network resources, devices, filesystem mounts, and isolated resource pools.
You can read in detail about systemd units here and here
example:
systemctl status apache2
* apache2.service - LSB: Apache2 web server
Loaded: loaded (/etc/init.d/apache2; bad; vendor preset: enabled)
Drop-In: /lib/systemd/system/apache2.service.d
`-apache2-systemd.conf
Active: active (running) since Wed 2016-10-12 14:29:42 UTC; 17s ago
Docs: man:systemd-sysv-generator(8)
Process: 1027 ExecStart=/etc/init.d/apache2 start (code=exited, status=0/SUCCESS)
systemctl will check if apache2 is a native unit or not. If not, then it
will ask systemd-sysv-generator to generate a file in unit format that provides support similar to native units. In the above example, the generated file is kept at
/lib/systemd/system/apache2.service.d/apache2-systemd.conf
Drop-In: /lib/systemd/system/apache2.service.d
`-apache2-systemd.conf
Note: you can find the generator at /lib/systemd/system-generators/systemd-sysv-generator and you can read more about that
man systemd-sysv-generator
Main point:
is-enabled NAME...
Checks whether any of the specified unit files are enabled (as with
enable). Returns an exit code of 0 if at least one is enabled,
non-zero otherwise. Prints the current enable status (see table).
To suppress this output, use --quiet.
Table 1. is-enabled output
+------------------+-------------------------+-----------+
|Name | Description | Exit Code |
+------------------+-------------------------+-----------+
|"enabled" | Enabled via | |
+------------------+ .wants/, .requires/ | |
|"enabled-runtime" | or alias symlinks | |
| | (permanently in | 0 |
| | /etc/systemd/system/, | |
| | or transiently in | |
| | /run/systemd/system/). | |
+------------------+-------------------------+-----------+
|"linked" | Made available through | |
+------------------+ one or more symlinks | |
|"linked-runtime" | to the unit file | |
| | (permanently in | |
| | /etc/systemd/system/ | |
| | or transiently in | > 0 |
| | /run/systemd/system/), | |
| | even though the unit | |
| | file might reside | |
| | outside of the unit | |
| | file search path. | |
+------------------+-------------------------+-----------+
|"masked" | Completely disabled, | |
+------------------+ so that any start | |
|"masked-runtime" | operation on it fails | |
| | (permanently in | > 0 |
| | /etc/systemd/system/ | |
| | or transiently in | |
| | /run/systemd/systemd/). | |
+------------------+-------------------------+-----------+
|"static" | The unit file is not | 0 |
| | enabled, and has no | |
| | provisions for enabling | |
| | in the "[Install]" | |
| | section. | |
+------------------+-------------------------+-----------+
|"indirect" | The unit file itself is | 0 |
| | not enabled, but it has | |
| | a non-empty Also= | |
| | setting in the | |
| | "[Install]" section, | |
| | listing other unit | |
| | files that might be | |
| | enabled. | |
+------------------+-------------------------+-----------+
|"disabled" | Unit file is not | > 0 |
| | enabled, but contains | |
| | an "[Install]" section | |
| | with installation | |
| | instructions. | |
+------------------+-------------------------+-----------+
|"bad" | Unit file is invalid or | > 0 |
| | another error occurred. | |
| | Note that is-enabled | |
| | will not actually | |
| | return this state, but | |
| | print an error message | |
| | instead. However the | |
| | unit file listing | |
| | printed by | |
| | list-unit-files might | |
| | show it. | |
+------------------+-------------------------+-----------+
if we run the command :
sudo systemctl is-enabled ssh
enabled
sudo systemctl is-enabled docker
enabled
sudo systemctl is-enabled apache2
apache2.service is not a native service, redirecting to systemd-sysv-install
Executing /lib/systemd/systemd-sysv-install is-enabled apache2
enabled
you can see if units are native to systemd like ssh and docker, in the above output it will show only enabled, and for units that are not native like apache2 but still enabled it gives messages with that rather than printing bad here because of this condition:
+------------------+-------------------------+-----------+
|"bad" | Unit file is invalid or | > 0 |
| | another error occurred. | |
| | Note that is-enabled | |
| | will not actually | |
| | return this state, but | |
| | print an error message | |
| | instead. However the | |
| | unit file listing | |
| | printed by | |
| | list-unit-files might | |
| | show it. | |
+------------------+-------------------------+-----------+
Solution:
status bad will not create problem (i am not sure it depends) but it will not provide all functionality of systemctl.
you can wait for next release of that package that will natively support systemd. or you can write unit file for your service or any other resource using given references.
You can read in detail about systemd , systemctl and units using below References :
Systemctl
Systemd units and Here
Systemd
Best Answer
The output of
service --status-alllists the state of services controlled bySystem V.The
+indicates the service is running,-indicates a stopped service. You can see this by runningservice SERVICENAME statusfor a+and-service.Some services are managed by
Upstart. You can check the status of allUpstartservices withsudo initctl list. Any service managed byUpstartwill also show in the list provided byservice --status-allbut will be marked with a?.Reference:
man service