Adding possibility of passing the RELEASE_COOKIE via ENV VAR to allow…

… /bin/calori remote connections

README.md

@@ -202,10 +202,11 @@ Avoid the execute a hotupgrade in the following situations:
 
 #### 1. IEX shell Access to Deployex App
 
-Connecting the iex shell:
+To connect to the iex shell, you may need to export the cookie if AWS is configured with a value different from the default 'cookie', which is highly recommended to change.
 
 ```bash
 ubuntu@ip-10-0-1-56:~$ sudo su
+root@ip-10-0-1-56:/home/ubuntu$ export RELEASE_COOKIE=COOKIE12345678912345789
 root@ip-10-0-1-56:/home/ubuntu$ /opt/deployex/bin/deployex remote
 Erlang/OTP 26 [erts-14.2.1] [source] [64-bit] [smp:1:1] [ds:1:1:10] [async-threads:1] [jit:ns]
 
@@ -215,15 +216,16 @@ iex(deployex@ip-10-0-1-56)1>
 
 ##### 2. IEX shell Access to Calori App
 
-Connecting the iex shell:
+To connect to the iex shell, you may need to export the cookie if AWS is configured with a value different from the default 'cookie', which is highly recommended to change.
 
 ```bash
-root@ip-10-0-1-56:/home/ubuntu$ sudo -su deployex
-deployex@ip-10-0-1-56:$ /var/lib/deployex/service/calori/current/bin/calori remote
-Erlang/OTP 26 [erts-14.2.1] [source] [64-bit] [smp:1:1] [ds:1:1:10] [async-threads:1] [jit:ns]
+ubuntu@ip-10-0-1-56:~$ sudo su
+root@ip-10-0-1-56:/home/ubuntu$ export RELEASE_COOKIE=COOKIE12345678912345789
+root@ip-10-0-1-56:/home/ubuntu$ /var/lib/deployex/service/calori/current/bin/calori remote
+Erlang/OTP 26 [erts-14.1.1] [source] [64-bit] [smp:1:1] [ds:1:1:10] [async-threads:1] [jit:ns]
 
 Interactive Elixir (1.16.0) - press Ctrl+C to exit (type h() ENTER for help)
-iex(calori@ip-10-0-1-56)1>
+iex(calori@ip-10-0-1-174)1>
 ```
 
 ##### 3. Logs
@@ -262,7 +264,7 @@ root@ip-10-0-1-56:/home/ubuntu$ tail -f /var/log/calori-stdout.log
 
 ##### 4. Updating CALORI_PHX_HOST
 
-In case you need to update the *__CALORI_PHX_HOST__*, there are 2 files that need to be updated:  `/etc/systemd/system/deployex.service` and `/etc/nginx/sites-available/default` (you need to be `root`` user to update them).
+In case you need to update the *__CALORI_PHX_HOST__*, there are 2 files that need to be updated:  `/etc/systemd/system/deployex.service` and `/etc/nginx/sites-available/default` (you need to be `root` user to update them).
 
 ```bash
 ubuntu@ip-10-0-1-56:~$ sudo su

rel/env.sh.eex

@@ -44,6 +44,8 @@ export ELIXIR_ERL_OPTIONS="-proto_dist inet_tls -ssl_dist_optfile /tmp/inet_tls.
 # export RELEASE_DISTRIBUTION=name
 # export RELEASE_NODE=<%= @release.name %>
 
-export RELEASE_COOKIE="cookie"
+# The Erlang cookie value is expected to be sourced by AWS and the next line
+# defines it if not passed to allow ./bin/app remote to use RELEASE_COOKIE
+[ -z ${RELEASE_COOKIE} ] && export RELEASE_COOKIE="cookie"
 export RELEASE_DISTRIBUTION=sname
 export RELEASE_NODE=<%= @release.name %>