From a remote shell, using the Heroku toolbelt, it's pretty easy to trigger a db backup with:
heroku pg:backups:capture --app my-app
But how can I do that from a script running on the app itself? Something triggered from the heroku scheduler or manually like:
heroku run node myScript.js --app my-app
I have psql available so maybe that's an option although I don't know where to write to.
I don't see a way to do this via API here: https://devcenter.heroku.com/articles/platform-api-reference
Suppose I started a one-off process using this command:
heroku run:detached "node do-some-stuff.js" --app my-app
The output of the command is this:
/usr/local/heroku/lib/heroku/jsplugin.rb:108: warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777
Running `node do-some-stuff.js` detached... up, run.3728
Use `heroku logs -p run.3728 -a my-app` to view the output.
I can heroku logs -p run.3728 -a my-app while the process is being run, however, when process has exited it outputs nothing. How do i view the logs for process that has finished?
If you using a logging plugin, just search for run.3728. For a short period of time, the logs will also still be in the heroku logs if you do heroku logs | grep run.3728
I'm running a NodeJS app on heroku local, however all my console.log statements and error messages get trimmed.
For example:
forego | starting web.1 on port 5000
web.1 | module.js:339
I don't see the full error logs. How to avoid this trimming of error messages?
heroku local will run whatever processes you tell it to in the Procfile. If you'd like to stream your development log, simply add something like log: tail -f log/development.log to your Procfile. You'll also want to make sure that you create a second Procfile (I use Procfile.dev) for this. Replace the log file path with wherever your desired log file is located.
Cheers!
Did you try?
$ heroku help local
Source: https://devcenter.heroku.com/articles/heroku-local
Is this deployed already? If so:
On terminal/bash:
$ heroku logs
On your heroku account:
1) Go to you account and then apps and then the log for that app
I have some miniapp that use delayed_job. On my localhost everything works fine, but when I deploy my app to Heroku and click on the link that should be executed by delayed_job, so nothing happen, the "task" is just saved into the table delayed_job.
In this article on heroku blog is written, that the task from delayed_job table is executed, when is run this command rake jobs:work.
But how can I run this command? Where should be the command placed? In the code, or from terminal console?
If you are running the Cedar stack, run the following from the terminal console:
heroku run rake jobs:work
If you are running the older stacks (Bamboo, Aspen, etc.):
heroku rake jobs:work
see: https://devcenter.heroku.com/articles/rake
According to the delayed_job documentation, you can also start a worker programmatically:
#!/usr/bin/env ruby
require File.dirname(__FILE__) + '/../config/environment'
Delayed::Worker.new.start
You should use a Procfile to scpecify the commands for your dynos.
For example you would have something like this in your Procfile:
appDir/Procfile
web: bundle exec rails server -p $PORT
worker: bundle exec rake jobs:work
To use this on your development machine, you should use Foreman, it's all explained at the docs.
https://devcenter.heroku.com/articles/procfile
In our case we're only running a delayed job once a month, so didn't want to have a worker dyno running constantly.
To solve this we queue up the job (with .delayed) and then use the Heroku platform API to spawn rake jobs:workoff in a one-off worker. The API call returns relatively quickly.
PlatformAPI.connect_oauth(ENV["YOUR_HEROKU_KEY"]).dyno.create(ENV["YOUR_HEROKU_APP_NAME"],{command: 'rake jobs:workoff'})
I have a small app on heroku. Whenever I want to see the logs I go to the command line and do
heroku logs
That only shows me about 100 lines. Is there not a way to see complete logs for our application on heroku?
Update (thanks to dawmail333):
heroku logs -n 1500
or, to tail the logs live
heroku logs -t
Heroku log documentation
If you need more than a few thousand lines you can Use heroku's Syslog Drains
Alternatively (old method):
$ heroku run rails c
File.open('log/production.log', 'r').each_line { |line| puts line }
Logging has greatly improved in heroku!
$ heroku logs -n 500
Better!
$ heroku logs --tail
references: http://devcenter.heroku.com/articles/logging
UPDATED
These are no longer add-ons, but part of the default functionality :)
Heroku treats logs as time-ordered streams of events. Accessing *.log files on the filesystem is not recommended in such an environment for a variety of reasons.
First, if your app has more than one dyno then each log file only represents a partial view into the events of your app. You would have to manually aggregate all the files to get the full view.
Second, the filesystem on Heroku is ephemeral meaning whenever your dyno is restarted or moved (which happens about once a day)the log files are lost. So you only get at most a day's view into that single dyno's logs.
Finally, on the Cedar stack running heroku console or even heroku run bash does not connect you to a currently running dyno. It spawns a new one specifically for the bash command. This is called a one-off process. As such, you won't find the log files for your other dynos that are running the actual http processes on the one spawned for heroku run.
Logging, and visibility in general, is a first-class citizen on Heroku and there are several tools that address these issues. First, to see a real-time stream of application events across all dynos and all layers of the application/stack use the heroku logs -t command to tail output to your terminal.
$ heroku logs -t
2010-09-16T15:13:46-07:00 app[web.1]: Processing PostController#list (for 208.39.138.12 at 2010-09-16 15:13:46) [GET]
2010-09-16T15:13:46-07:00 app[web.1]: Rendering template within layouts/application
2010-09-16T15:13:46-07:00 heroku[router]: GET myapp.heroku.com/posts queue=0 wait=0ms service=1ms bytes=975
2010-09-16T15:13:47-07:00 app[worker.1]: 2 jobs processed at 16.6761 j/s, 0 failed ...
This works great for observing the behavior of your application right now. If you want to store the logs for longer periods of time you can use one of the many logging add-ons that provide log retention, alerting and triggers.
Lastly, if you want to store the log files yourself you can setup your own syslog drain to receive the stream of events from Heroku and post-process/analyze yourself.
Summary: Don't use heroku console or heroku run bash to view static log files. Pipe into Heroku's stream of log events for your app using heroku logs or a logging add-on.
Well, the above answers are very helpful it will help you to view from the command line. Whereas if you want to check from GUI so you have to log into your Heroku account and then select your application and finally click on view logs
Follow on Heroku logging
To view your logs we have:
logs command retrives 100 log lines by default.
heroku logs
show maximum 200 lines, --num (or -n) option.
heroku logs -n 200
Show logs in real time
heroku logs --tail
If you have many apps on heroku
heroku logs --app your_app_name
Also see individual streams/filters.
E.g tail only your application logs
heroku logs --source app -t
Or see only the router logs
heroku logs --ps router
Or chain them together
heroku logs --source app --ps worker
So good..
You can access your log files using Heroku's Command Line
Interface (CLI Usage).
If Heroku's CLI is installed and you know your application name (like https://myapp.herokuapp.com/), then you can run the following command:
heroku logs --tail --app=myapp
You can also access the logs in a real-time stream using:
heroku logs --source app --tail --app=myapp
If the logs tell you something like this:
npm ERR! A complete log of this run can be found in:
npm ERR! /app/.npm/_logs/2017-07-11T08_29_45_291Z-debug.log
Then you can also access them using the bash terminal via Heroku CLI:
heroku run bash --app=myapp
less ./.npm/_logs/2017-07-11T08_29_45_291Z-debug.log
heroku logs -t shows us the live logs.
Might be worth it to add something like the free Papertrail plan to your app. Zero configuration, and you get 7 days worth of logging data up to 10MB/day, and can search back through 2 days of logs.
My solution is to get complete log the first time the application start, like:
heroku logs -n 1500 > log
then add fgrep -vf to keep it up to date, like:
heroku logs -n 1500 > newlog ; fgrep -vf log newlog >> log
for continuous logging, just iterate it using watch for every x minutes (or seconds).
You need to use -t or --tail option and you need to define your heroku app name.
heroku logs -t --app app_name
for WAR files:
I did not use github, instead I uploaded directly, a WAR file ( which I found to be much easier and faster ).
So the following helped me:
heroku logs --app appname
Hope it will help someone.
You need to have some logs draining implemented and should be draining your logs there, to see all of the logs (manage historical logs as well):
First option - Splunk can be used: you can drain all your logs like:
heroku drains:add syslog+tls://splunk-server.com:514 -a app_name
And then login into your splunk server and search for any number of logs. I am using Splunk and this is working perfectly fine for me.
Second option - You can purchase add on to your App, like given below: (I haven't used these options, however these are the available ones).
Timber.io
Sumo Logic
LogEnteries
Log DNA
Papertrail
You can also have a look at below options: If you want to have your
logs in JSON format, as it will help if your are pushing your logs to
external system like Splunk/ELK, it would become easy (performance
wise also) to search in JSON.
https://github.com/goodeggs/heroku-log-normalizer
It is not having Readme.md, but some explanation is given at https://github.com/goodeggs/bites/issues/20
Lastly
And you can always use below command as mentioned by other users already:
The following command will tail the generating logs on heroku
heroku logs -t -a <app_name>
The following comand will show the 1000 number of lines of logs from heroku
heroku logs -n 1000 -a <app_name>
Note only 1500 latest lines of logs are available and rest of them gets deleted from heroku dyno.
To see the detailed log you need to put two lines in the production.rb file:
config.logger = Logger.new(STDOUT)
config.logger.level = Logger::DEBUG
and then by running
heroku logs -t
you can see the detailed logs.
I prefer to do it this way
heroku logs --tail | tee -a herokuLogs
You can leave the script running in background and you can simply filter the logs from the text file the way you want anytime.
heroku logs -t shows us the live logs.
heroku logs -n 1500 for specific number of logs
But still I would recommend to use paper trail add-on which have certain benefits and has free basic plan.
I suggest using an addon, I use Logentries. To use it, run in your command line:
heroku addons:create logentries:le_tryit
(that command creates the addon for a free account but clearly you can upgrade if you want)
Logentries allows you to save up to 5GB of log volume per month. That info is searchable by their command search within the last 7 days and it has real-time alerts.
So to answer your question, by using this addon you ensure that your logs aren't lost anymore when you reach the 1500 lines that Heroku saves by default.
Hope this helps! Have a great day!
You can use
heroku logs -n 1500
But this is not a recommended approach(in other word doesn't show you the real picture)
I would suggest you plug some logging tool. ( sumoLogic, paper trail n all ) as an add-on
They all have a free version( with few limitations, though enough for a small app or dev env, which will provide good insight and tool to analyze logs )
I was running into a situation where in my apps' dashboard, when I went to:
More > View logs
I wouldn't get an output, just hung...
So I did a google and found this:
Heroku CLI plugin to list and create builds for Heroku apps.
I installed it and ran:
heroku builds -a example-app /* Lists 10 most recently created builds for example-app, that's where you get the id for the next step*/
Then enter:
heroku builds:output your-app-id-number -a example-app
And that's it, you should get back what you normally see in the dashboard GUI or locally.
Hope this helps someone like it did me!
If your code is in python,
You can use the heroku3 pip library to access the logs for your Heroku app.
First, you'll need to install the library by running.
pip install heroku3
Then, you can use the following code to access your logs:
import heroku3
# Connect to the Heroku API
conn = heroku3.from_key('YOUR_API_KEY')
# Get the app you want to access logs for
app = conn.app('YOUR_APP_NAME')
# Access the logs
logs = app.logs().stream()
# Print the logs
for line in logs:
print(line)
Make sure to replace YOUR_API_KEY and YOUR_APP_NAME with the appropriate values for your app.
Additionally, you can use the heroku logs --tail
command in your command line to stream the logs for your Heroku app. Make sure you are logged in and you have the access to the app.
For cedar stack see:
https://devcenter.heroku.com/articles/oneoff-admin-ps
you need to run:
heroku run bash ...