Im writing a tool and one of its commands allows you to start a new session
How can I make a golang program restart itself? If your solution is OS-Strict im on Linux.
I tried
// exec from os/exec
exec.Command(os.Args[0]).Run()
but it doesnt work. I get a blank input session which is hard to explain
My Program Input: session new
:(
:(
each of the :( represent a blank line where im able to type stuff and hit enter, there are 2 which means i hit enter twice
Im expecting
My Program Input: session new
My Program Input:
Edit: more accurately, i want to make a subprocess of the same program
You could use a separate process, like radovskyb/gobeat.
Example:
sudo gobeat -pid=1234 -cmd="go run sendemail.go"
Run with sudo so gobeat will restart the server in the same terminal tty that it originated in. (sudo)
Point gobeat to the process of the running server that you want gobeat to monitor. (gobeat -pid=1234)
Set the cmd flag to run a Go file that will send an email notifying you that the server was restarted. (-cmd="go run sendemail.go")
If you do not want a separate process, then consider implementing a graceful upgrade
You can use the library cloudflare/tableflip for instance.
Related
I’m trying to run a bash script in the background using Laravel. I’m currently using Symfony process to run it. However, there is a timeout and the user won’t be able to navigate the website until the script is done. The script doesn’t output anything. It simply runs other scripts and take the output and insert it into a database.
I have tried appending & at the end of the command as well as dev/null. No matter what I do the user can’t navigate away from the page until the script is done executing. If the user navigates away from the page, the script is stoped.
Regards,
Arron
You should use laravel queues, it is exactly what you want :
https://laravel.com/docs/5.8/queues
The easiest way is with a database, but if you are using it with redis, you can also use Laravel Horizon to monitor them : https://laravel.com/docs/5.8/horizon
Configure supervisord to run your script in the background. Google how to install and setup supervisor.
Until we can implement our new HEAT SM system i am needing to create some workflows to ease our currently manual user administration processes.
I intend to use Powershell to execute the actual tasks but need to use VBS to send an argument to PS from an app.
My main question on this project is, Can an argument be sent to an already running Powershell process?
Example:
We have a PS menu app that we will launch in the AM and leave running all day.
I would love for there to be a way to allow PS to listen for commands/args and take action on them as they come in.
The reason I am wanting to do it this way is because one of the tasks needs to disable exchange features and the script will need to establish a connection a remote PSsession which, in our environment, can take between 10-45 seconds. If i were to invoke the command directly from HEAT (call-logging software) it would lock up while also preventing the tech from moving on to another case until the script terminates.
I have searched all over for similar functionality but i fear that this is not possible with PS.
Any suggestions?
I had already setup a script to follow this recommendation but i was curious to see if there was a more seamless approach
As suggested by one of the comments by #Tony Hinkle
I would have the PS script watch for a file, and then have the VBScript script create a file with the arguments. You would either need to start it on another thread (since the menu is waiting for user input), or just use a separate script that in turn starts another instance of the existing PS script with a param used to specify the needed action
I'm trying to start a service via a script that I run through cron. Basically it just does this
/local/services/servicename status
/local/services/servicename stop
/local/services/servicename start
The service starts fine if I run the commands myself, but whenever I run it via the script, and I check for the service status manually, its response is always
Servicename Service is not running.
I am truly confuse right now. Any particular reason why a bash script wouldn't be able to start the services?
Not really an answer to your specific question, but definitely a useful tip for debugging cron behavior in general. Cron sends email messages to the user it runs as. If you run that in the root crontab, run the mail command in a terminal as root and you'll see the cron messages in your inbox. Check them by typing the message number (or man mail to learn how to use it).
I'm using Ubuntu. I have two bash script files. Both will run in parallel. Now I want to continuously monitor on another file that it is running or not.
So any way to find that the file is currently executing or not ?
Numerous possibilities, it is a question of creativity...
Some suggestions:
periodically poll the process list and filter it by name or process id
start the script with control sockets, as long as the sockets are open the script runs
use the usual locking strategy in file system.
have the script do a lifebeat on a regular base, then watch that lifebeat.
start the script in a series of commands, the moment the script exists the next command will be executed by the calling shell. That one could be a notification script or something.
have the script do some wiggling on your desktop and watch it yourself.
start it using nohup and watch the log file.
implement a deamon inside the script and connect periodically.
open a file from within the script and watch the file system using the fuser system call.
periodically write a token into a file by the monitoring script and have the monitored script remove that token, like a baton.
call the script using a blocking call. The script executes as long as that blocking call does not return.
create a singleton strategy on process level and simply try starting it periodically.
make the monitoring script act as a monitor deamon the executing script connects to. If the connection is terminated the scipt obviously has stopped executing.
...
Sorry, this starts getting boring...
So I've got dozens of servers I connect to and want a simple Ruby script that provides me with a list of those servers. Picking one will start up SSH with the proper connection details and let me start using it. That's it!
But, I don't want/need Ruby to keep running. If I did I could use Net::SSH and capture all output and send it back to the user, but this is an extra layer I don't need. I simply want to use Ruby as a "script starter" and then close itself.
Any ideas? I've thought about forking processes but I don't know how I'd attach the terminal to the new ssh one.
I have a simple bash script that does this already, but I want to add more functionality like being able to add to the list, remove servers, etc. all from the command line. I'm sure I could do this with bash as well but I'm much more comfortable with Ruby.
Maybe exec will do the trick
http://en.wikipedia.org/wiki/Exec_(operating_system)
http://ruby-doc.org/core/classes/Kernel.html#M005968