Unable to start observer locally

joaquinalcerro

Hi,

I am trying to start the observer in iex without success. This is my scenario:

Erlang/OTP 20 [erts-9.3] [source] [64-bit] [smp:4:4] [ds:4:4:10] [async-threads:10] [hipe] [kernel-poll:false]

[info] Running HcmWeb.Endpoint with Cowboy using http://0.0.0.0:4000
Interactive Elixir (1.6.4) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> 21:21:12 - info: compiling
21:21:13 - info: compiled 12 files into 2 files, copied 7 in 5.5 sec

Applications started:

iex(4)> Application.started_applications()
[
  {:hcm, 'hcm', '0.0.1'},
  {:phoenix_ecto, 'Integration between Phoenix & Ecto', '3.3.0'},
  {:postgrex, 'PostgreSQL driver for Elixir.', '0.13.5'},
  ........
  ........
  {:comeonin, 'Password hashing (bcrypt, pbkdf2_sha512) library for Elixir.\n',
   '3.2.0'},
  {:runtime_tools, 'RUNTIME_TOOLS', '1.12.5'},
  {:logger, 'logger', '1.6.4'},
  .........
  ]

Undefined:

iex(5)> :observer.start()
** (UndefinedFunctionError) function :observer.start/0 is undefined (module :observer is not available)
    :observer.start()
iex(5)>

My mix file

  def application do
    [
      mod: {Hcm.Application, []},
      extra_applications: [
        :logger,
        :runtime_tools,
        :coherence,
        :number,
        :hackney,
        :poison,
        :ssl
      ]
    ]
  end

Not really sure what is happening.

Thanks for the help.

5 comments

#erlang #observer

0 4279 5

2019-02-10 22:18:46 UTC

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idi527

You need to add :observer to the list of applications to start, probably.

Post #1

josevalim

Creator of Elixir

How did you install Erlang? Some distributions breaks Erlang in multiple packages, so you need to make sure you have the observer one installed in your system.

Post #2

joaquinalcerro

I am using OpenSuSe Tumbleweed and I installed Erlang adding the Erlang Repo to the package manager then installing it directly.

zypper repos                                                                                                                                                                           1 ↵
Repository priorities are without effect. All enabled repositories share the same priority.

# | Alias               | Name                        | Enabled | GPG Check | Refresh
--+---------------------+-----------------------------+---------+-----------+--------
1 | PostgreSQL          | PostgreSQL                  | Yes     | (r ) Yes  | No     
2 | erlang              | erlang                      | Yes     | (r ) Yes  | Yes    
3 | google              | google                      | Yes     | (r ) Yes  | No     
4 | openSUSE-20180308-0 | openSUSE-20180308-0         | No      | ----      | ----   
5 | repo-debug          | openSUSE-Tumbleweed-Debug   | No      | ----      | ----   
6 | repo-non-oss        | openSUSE-Tumbleweed-Non-Oss | Yes     | (r ) Yes  | Yes    
7 | repo-oss            | openSUSE-Tumbleweed-Oss     | Yes     | (r ) Yes  | Yes    
8 | repo-source         | openSUSE-Tumbleweed-Source  | No      | ----      | ----   
9 | repo-update         | openSUSE-Tumbleweed-Update  | Yes     | (r ) Yes  | Yes    
------------------------------------------------------------

To install:

sudo zypper install erlang

Based on your suggestion, I check the repo for the observer package and it was not installed:

~ » zypper info erlang-observer
Loading repository data...
Reading installed packages...

Information for package erlang-observer:
----------------------------------------
Repository     : openSUSE-Tumbleweed-Oss                  
Name           : erlang-observer                          
Version        : 20.3.2-1.2                               
Arch           : x86_64                                   
Vendor         : openSUSE                                 
Installed Size : 1.1 MiB                                  
Installed      : No                                       
Status         : not installed                            
Source package : erlang-20.3.2-1.2.src                    
Summary        : A GUI tool for observing an erlang system
Description    :                                          
    The observer is gui frontend containing various tools to inspect a system.
    It displays system information, application structures, process information,
    ets or mnesia tables and a frontend for tracing with ttb.

------------------------------------------------------------

So I finally installed it and everything works fine.