When you start your phoenix server
I guess when creating the instance and running the instance-startup.sh
what IP is it binding to
Im not sure about this
hello_team@hello-instance:~$ netstat -lnpt | grep 8080
(No info could be read for "-p": geteuid()=1000 but you should be root.)
I’m sorry if I’m not helping. I’m still new at deployment. 
Then leave of the -p it is not that important. netstat -lnt | grep 8080 will be enough to see if something is listening on port 8080 and which IP it has bound to.
And also, please try to curl your application from the host running it. If its working there, we can put more energy in debugging the networking issue.
What do you guess with that file?
As I said, it should be in the logs.
netstat -lnt | grep 8080 not showing anything
netstat -lnt showing this
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:4369 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp6 0 0 :::4369 :::* LISTEN
tcp6 0 0 :::22 :::* LISTEN
curl is working on the server
instance-stratup.sh is the file that run PORT=8080 ./hello-release start
You can refer in the tutorial in section “Create a startup script”
Wait? there is nothing listening on port 8080, but a local curl works fine?
Yup. curl --help does show the list of curl options
hello_team@hello-instance:~$ curl -V
curl 7.52.1 (x86_64-pc-linux-gnu) libcurl/7.52.1 OpenSSL/1.0.2q zlib/1.2.8 libidn2/0.16 libpsl/0.17.0 (+libidn2/0.16) libssh2/1.7.0 nghttp2/1.18.1 librtmp/2.3
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtmp rtsp scp sftp smb smbs smtp smtps telnet tftp
Features: AsynchDNS IDN IPv6 Largefile GSS-API Kerberos SPNEGO NTLM NTLM_WB SSL libz TLS-SRP HTTP2 UnixSockets HTTPS-proxy PSL
I asked you to curl your application locally. curl localhost:8080 or something like that.
But I assume it wont work.
How exactly are you starting the application? Are you using foreground or start? If you do the former, do you close the connection/terminal or do you keep it open? You application will shut down as soon as the parent process dies. If though you use the latter, please check your logs for any error messages.
Let’s backup abit. Im starting to get confuse now.
So first, I run this command
PORT=8080 _build/prod/rel/hello/bin/hello.run foreground
Without stopping this command I run curl localhost:8080,
It will show the HTML file for the home page
The project runs perfectly when I, PORT=8080 _build/prod/rel/hello/bin/hello.run foreground
There were no errors, the logs from Phoenix does show normally without errors
And while it is still running, what does netstat tell you now? Are you able to access your site from external?
Muhammads-MacBook-Pro:hello Azim$ netstat -lnt | grep 8080
tcp4 0 0 192.168.0.116.49980 192.168.0.157.8080 TIME_WAIT
I can access the site using localhost:8080 not the remote server
The listener is bound to the IP 192.168.0.157, This does not look like its your external IP.
Try setting http: [ip: {0, 0, 0, 0}, port: …, …] in your config to accept connections on all IPs.
Wait? Why MacBook? Is GCE running on macbooks?
Wait. You want me to run the commands in GCE or my local machine?
Hahaha. Im confuse now 
Do you want to deploy to GCE or to your local laptop?
I want to deploy to GCE
Then run the commands on GCE.
I want to know on what IP the application binds to, I want to know if it works when you curl the application locally on the remote (yeah, confusing, I know)
hello_team@hello-instance:~$ netstat -lnt
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:4369 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp6 0 0 :::4369 :::* LISTEN
tcp6 0 0 :::22 :::* LISTEN
hello_team@hello-instance:~$ curl localhost:8080
curl: (7) Failed to connect to localhost port 8080: Connection refused
Is the application currently running?
Until we got that sorted, we need to make sure that you started it manually using … foreground and then not close that terminal, but use another one to do the curl and netstat.
I’m not sure. What I know from the tutorial in “Deploying your application to a single instance” section there’s a instance-startup.sh that I added in the root of my project and the last line in the instance-startup.sh is PORT=8080 ./hello-release start and I just create an instance in GCE by running
gcloud compute instances create hello-instance \
--image-family debian-9 \
--image-project debian-cloud \
--machine-type f1-micro \
--scopes "userinfo-email,cloud-platform" \
--metadata-from-file startup-script=instance-startup.sh \
--metadata release-url=gs://hello-releases/hello-release \
--zone asia-southeast1-a \
--tags http-server
In my bucket there’s hello-releases/hello-release
I do not mind the turial. We already have learnt that it for some reasons doesn’t do as we expect.
Please log in to the host, start your application in foreground mode, fire up a second SSH into that host and check curl and netstat, while you are doing this, please also observe the logs of the foreground instance. The curl should show up there.
I’m not sure how to start the application in foreground from the GCE.
hello_team@hello-instance:/$ ls
app bin boot dev etc home initrd.img initrd.img.old lib lib64 lost+found media mnt opt proc root run sbin srv startup-LfE2ig sys tmp usr var vmlinuz vmlinuz.old
hello_team@hello-instance:/$ cd app/
hello_team@hello-instance:/app$ ls
cloud_sql_proxy hello-release tmp
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