Stop Docker Container via SSH and/or if other machine does not respond

[Renegade605]

I have two servers running Unraid. Server B runs a docker container that monitors the files on Server A via NFS remote mount. If Server A goes offline for a prolonged period of time, the container on Server B can't see the remote mount. This results in the container having to rescan all files on Server A once it comes back up, which can take several days.

 

What I'd like to do:

Server A should stop the container on Server B when the array is stopped, and start it again when the array is started.

 

I've tried configuring a user script on Server A to SSH into Server B and start/stop the container on array start/stop, but I can't figure out how to make SSH commands work in a user script.

 

Secondary use:

Server B should frequently ping Server A and, if it does not respond, stop the container.

 

The above script should be sufficient most of the time, but if Server A hangs or crashes, it won't be able to execute the array stop script, so this should serve as appropriate backup. I am not an experienced bash user, so I do not know how to accomplish this.

 

 

If you've done something similar, or otherwise know how it might be accomplished, please let me know. Cheers!

[okkies]

we can start an array  with:

#!/bin/bash emcmd cmdStart=Start
and stop an array with 
#!/bin/bash emcmd cmdStop=Stop

(source) https://forums.unraid.net/topic/79924-startstop-array-via-cli/

i dont know how you can see the current status. if you can figure out the current status of the array. 
perhaps it you can find it here. https://wiki.unraid.net/Console 

beside that, i done something remotely similair just now. 


 

ive made an node-red automation in home assistant that checks if a VM is active, and if its active using Virsh domstate it sets the state. (bottom part)
Or when i manually change the state the VM will turn itself on or off (top 2 smaller parts) 

Ive exported what i made, you can directly import this in Node-red, also install these pallets

"node-red-contrib-bigssh"

"node-red-contrib-bigline" 
then you can import this module to set it up. 

[{"id":"143dd69542798222","type":"tab","label":"Set state of VM workstation","disabled":false,"info":"","env":[]},{"id":"d3b7983c.c97908","type":"bigssh","z":"143dd69542798222","name":"virsh domstate 'Work Vm\"","commandLine":"virsh domstate 'Work Vm'","commandArgs":"","minError":1,"minWarning":1,"noStdin":false,"format":"","payloadIsArg":true,"myssh":"3a26c7d9be25c952","x":270,"y":1240,"wires":[["477828b0.0ecb68"],[],[]]},{"id":"7a7fdea4.2ec13","type":"inject","z":"143dd69542798222","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"120","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"checkedstatus","payloadType":"flow","x":200,"y":1120,"wires":[["d3b7983c.c97908"]]},{"id":"477828b0.0ecb68","type":"bigline","z":"143dd69542798222","name":"","filename":"","format":"utf8","keepEmptyLines":false,"x":480,"y":1240,"wires":[["57e4f6a28403bb1c"],[]]},{"id":"57d1bc03d78f8cc6","type":"debug","z":"143dd69542798222","name":"debug 1","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":1240,"y":1220,"wires":[]},{"id":"c0f2ca54619b43a6","type":"api-call-service","z":"143dd69542798222","name":"","server":"424d958a.550f6c","version":5,"debugenabled":false,"domain":"input_boolean","service":"turn_on","areaId":[],"deviceId":[],"entityId":["input_boolean.work_vm_unraid"],"data":"","dataType":"jsonata","mergeContext":"","mustacheAltTags":false,"outputProperties":[],"queue":"none","x":1040,"y":1220,"wires":[["57d1bc03d78f8cc6"]]},{"id":"69e280abb4bb2501","type":"api-call-service","z":"143dd69542798222","name":"","server":"424d958a.550f6c","version":5,"debugenabled":false,"domain":"input_boolean","service":"turn_off","areaId":[],"deviceId":[],"entityId":["input_boolean.work_vm_unraid"],"data":"","dataType":"jsonata","mergeContext":"","mustacheAltTags":false,"outputProperties":[],"queue":"none","x":1040,"y":1280,"wires":[["2918880847aead4b"]]},{"id":"2918880847aead4b","type":"debug","z":"143dd69542798222","name":"debug 2","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":1240,"y":1280,"wires":[]},{"id":"57e4f6a28403bb1c","type":"function","z":"143dd69542798222","name":"function 1","func":"var state = msg.payload.trim(); // trim the output to remove any extra whitespaces\nif (state === 'running') {\n    msg.payload = 'Running';\n} else if (state === 'shut off') {\n    msg.payload = 'Shut off';\n} else {\n    msg.payload = 'Unknown';\n}\nreturn msg;\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":660,"y":1240,"wires":[["074f53b1651d9286","a7a8ce0300c31706"]]},{"id":"074f53b1651d9286","type":"debug","z":"143dd69542798222","name":"debug 3","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":860,"y":1140,"wires":[]},{"id":"a7a8ce0300c31706","type":"switch","z":"143dd69542798222","name":"","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"Running","vt":"str"},{"t":"eq","v":"Shut off","vt":"str"}],"checkall":"true","repair":false,"outputs":2,"x":830,"y":1260,"wires":[["c0f2ca54619b43a6"],["69e280abb4bb2501"]]},{"id":"ed1f89c48c5cd42c","type":"bigssh","z":"143dd69542798222","name":"virsh start 'Work Vm'","commandLine":"virsh start 'Work Vm'","commandArgs":"","minError":1,"minWarning":1,"noStdin":false,"format":"","payloadIsArg":true,"myssh":"3a26c7d9be25c952","x":960,"y":800,"wires":[[],[],[]]},{"id":"aa22a57b149a4984","type":"bigssh","z":"143dd69542798222","name":"virsh shutdown 'Work Vm'","commandLine":"virsh shutdown 'Work Vm'","commandArgs":"","minError":1,"minWarning":1,"noStdin":false,"format":"","payloadIsArg":true,"myssh":"3a26c7d9be25c952","x":970,"y":920,"wires":[[],[],[]]},{"id":"ba95c1fa3e19dec9","type":"server-state-changed","z":"143dd69542798222","name":"","server":"424d958a.550f6c","version":4,"exposeToHomeAssistant":false,"haConfig":[{"property":"name","value":""},{"property":"icon","value":""}],"entityidfilter":"input_boolean.work_vm_unraid","entityidfiltertype":"exact","outputinitially":true,"state_type":"habool","haltifstate":"false","halt_if_type":"bool","halt_if_compare":"is","outputs":2,"output_only_on_state_change":true,"for":"0","forType":"num","forUnits":"minutes","ignorePrevStateNull":false,"ignorePrevStateUnknown":false,"ignorePrevStateUnavailable":false,"ignoreCurrentStateUnknown":true,"ignoreCurrentStateUnavailable":true,"outputProperties":[{"property":"payload","propertyType":"msg","value":"","valueType":"entityState"},{"property":"data","propertyType":"msg","value":"","valueType":"eventData"},{"property":"topic","propertyType":"msg","value":"","valueType":"triggerId"}],"x":520,"y":920,"wires":[["aa22a57b149a4984"],[]]},{"id":"42e9f73e317e6bbf","type":"server-state-changed","z":"143dd69542798222","name":"","server":"424d958a.550f6c","version":4,"exposeToHomeAssistant":false,"haConfig":[{"property":"name","value":""},{"property":"icon","value":""}],"entityidfilter":"input_boolean.work_vm_unraid","entityidfiltertype":"exact","outputinitially":true,"state_type":"habool","haltifstate":"true","halt_if_type":"bool","halt_if_compare":"is","outputs":2,"output_only_on_state_change":true,"for":"0","forType":"num","forUnits":"minutes","ignorePrevStateNull":false,"ignorePrevStateUnknown":false,"ignorePrevStateUnavailable":false,"ignoreCurrentStateUnknown":true,"ignoreCurrentStateUnavailable":true,"outputProperties":[{"property":"payload","propertyType":"msg","value":"","valueType":"entityState"},{"property":"data","propertyType":"msg","value":"","valueType":"eventData"},{"property":"topic","propertyType":"msg","value":"","valueType":"triggerId"}],"x":520,"y":800,"wires":[["ed1f89c48c5cd42c"],[]]},{"id":"663084b0f96e0085","type":"comment","z":"143dd69542798222","name":"Check every minute if the actual state is changed","info":"","x":480,"y":1080,"wires":[]},{"id":"948684c228ff774f","type":"comment","z":"143dd69542798222","name":"crrect the state if required","info":"","x":1070,"y":1140,"wires":[]},{"id":"f13982d83493ba22","type":"comment","z":"143dd69542798222","name":"turn on boolean","info":"","x":260,"y":800,"wires":[]},{"id":"983a68fed78f959e","type":"comment","z":"143dd69542798222","name":"turn off boolean","info":"","x":260,"y":920,"wires":[]},{"id":"3a26c7d9be25c952","type":"SSH_Credentials","host":"192.168.30.14","port":"22","userlabel":"[email protected]"},{"id":"424d958a.550f6c","type":"server","name":"Home Assistant","addon":true}]

 

 

[Renegade605]

Thanks for the ideas but I think you may have misunderstood. 

 

User Scripts is already capable of running a script on array start/stop, it's remotely stopping a container that I need to do. 

 

Using NR or any other software won't be an option as it will be stopped before the array stops. 

[okkies]

to find your docker container id

docker ps

to kill or stop the container

docker stop container <container number>
docker kill container <container number>

 

remotely run the script using SSH

ssh root@<remoteserverip> "docker stop container <containerID>"

Sause: https://www.cyberciti.biz/faq/linux-unix-osx-bsd-ssh-run-command-on-remote-machine-server/

you have to setup ssh to login without the password tough, forgot how to do that, but google/ chatgpt is your friend:
for windows:
 

ssh-keygen 
type C:\Users\username\.ssh\id_rsa.pub | ssh user@hostname 'mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys'

 

Edited February 27, 2023 by okkies