Exec node fails with error:127 ... any ideas why?

[questuk]

Hi,

I am running Node-RED in Docker.
I am sending text to the Exec node to enable speech output.
Text is "Speaker_in_PC_Room" and the command is espeak -s 130 -k3
But I get the errors on the image below.

Is it that it doesn't know how to process bash or is it that it can't access Espeak software within Docker ?

I know it's a long shot on here but I am not certain which one is at fault.

Thanks

[Steve-Mcl]

@questuk

Is it that it doesn't know how to process bash or is it that it can't access Espeak software within Docker

It looks like bash cannot find espeak.

are you 100% certain it is installed inside the container?

perhaps you need to supply the full path to espeak e.g. /some/path/to/espeak -s 130 ... (of course only you will know where that is by looking inside the container)

[questuk]

Hi,

I don't think espeak is installed within Docker, I have tried to add it via a terminal but I get an error.
First i tried to update and got ... apk update ERROR: Unable to lock database: Permission denied

I have been unable to find out how to get permission as I have installed Node-RED from compose.yaml file.

I believe i am correct in accessing it via terminal as below ?
If I get past this I may be able to do apk add espeak

Thanks for your help.

[meeki007]

This will get you into the container as a root user

$ docker exec -it --user=root gb-node-red-1 /bin/sh 

Then try to install it

$ apk add espeak

[questuk]

I think I have installed it ... i used

docker exec -it --user root gb-node-red-1 sh
/usr/src/node-red # apk add espeak

Not sure if this is the correct place ?

Then i tried espeak "hello, world"

and then in the terminal i got line and lines and like this ...

ALSA lib confmisc.c:855:(parse_card) cannot find card '0'
ALSA lib conf.c:5181:(_snd_config_evaluate) function snd_func_card_inum returned error: No such file or directory
ALSA lib confmisc.c:422:(snd_func_concat) error evaluating strings
ALSA lib conf.c:5181:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory
ALSA lib confmisc.c:1334:(snd_func_refer) error evaluating name
ALSA lib conf.c:5181:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:5704:(snd_config_expand) Evaluate error: No such file or directory
ALSA lib pcm.c:2666:(snd_pcm_open_noupdate) Unknown PCM sysdefault
ALSA lib confmisc.c:855:(parse_card) cannot find card '0'

Perhaps Alpine linux does not have sound driver or does it need configuring ?

Thanks

[meeki007]

oh-boy ... I did not know what espeak was . I just know how to install things to a node-red docker image.

Ive added system devices to docker before. Look at this documentation:
https://docs.docker.com/engine/reference/commandline/container_run/#device

You need to add a sound device probably. Sound? so If it was me I would run my nodered docker container like this:

docker run -d \
...your options....
--device /dev/snd:/dev/snd \
gb-node-red-1

this is an example ... might work but you need to do more reading unless somone else has done espeak before...

also I dont use compose.yaml for my docker needs. I can read it. Then I make my own one liner for running command in terminal. You will need to add the --device option to your yaml file.

NOTE: this assumes your running docker on a unbuntu / debian based distro and not windows or mac.

[Colin]

Do you need to use docker? Often life is much easier without it.