Why supervisord does not log my PHP CLI fwrite(STDOUT, "message")?

Question 1

Albert’s Question:

I have a PHP command line application ( zconsole awswebhookrunner ) run by supervisord.

Supervisord does not log on the files fwrite(STDOUT, "message") but it does log echo "message".

Supervisord config

[program:aws_webhook]
command=/home/(username)/bin/zconsole awswebhookrunner
process_name=%(program_name)s_%(process_num)02d
numprocs=1
directory=/tmp
priority=999
autostart=true
autorestart=true
startretries=100
stopwaitsecs=10
user=(username)
stdout_logfile=/home/(username)/logs/aws_webhook_runner.out.log
stderr_logfile=/home/(username)/logs/aws_webhook_runner.err.log
stdout_logfile_maxbytes=10MB

PHP Code

private function log($message, $type="info")
{
    $output=STDIN;
    switch ($type) {
        case "error":
            $output=STDERR;
            break;
        default:
            $output=STDIN;
    }
    $to_log=date("Y-m-d H:i:s")." ".$message;
    fwrite($output,$to_log.PHP_EOL) ;
    //echo $to_log.PHP_EOL;
    fflush($output);
    unset($to_log);
}

Software version

PHP version: 5.3.3
OS: CentOS 6.10
supervisord: 3.3.5

Questions

Is my supervisord setup correct?
Do I have a misunderstood the behavior of fwrite(STDOUT|STDERR, $message);?
Why echo $message; works if it is sent to STDOUT?

Answer

Starx

Configuration wise, I think it is fine. Command-wise, it’s a different question really.
You are trying to STDIN rather than STDOUT. STDIN is used for input supervisord does not deal with STDIN I think.
echo would print to STDOUT because it is its default behavior.

Question 2

Answer

Starx

Your second implementation

$nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);

Should work if you have the extension installed and properly configured. I would look into that if I were you.

You can check your PHP’s configuration using phpinfo() to check if the sodium is enabled.

And, If you haven’t installed, install using:

sudo pecl install -f libsodium

Question 3

Answer

Starx

No matter how the data table is rendered, it still is a markup that is added dynamically to the DOM.

So, a delegated event listener like the following will work.

$("table").on('click', 'tr', function() {
    // Get the id somehow
    let id = 1;
    showDetails(id);
});

Question 4

Answer

Starx

I encountered the same problem as well. I was installing a fixed version using chef and the problem was exactly as the OP has.

To solve it, I searched for the available packages

apt-cache madison docker-ce

It gave me an output like this

docker-ce | 18.06.1~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 18.06.0~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages
docker-ce | 18.03.1~ce~3-0~ubuntu | https://download.docker.com/linux/ubuntu bionic/stable amd64 Packages
W: Target Packages (stable/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/Docker.list:1 and /etc/apt/sources.list.d/docker-stable.list:1
…

And I picked most up-to-date version from the list and it worked.

Question 5

Answer

Starx

On the new version of Vagrant, answer by @Amos Shapira gets stuck in an infinite loop. The reason for that is each call to vagrant plugin install also processes the Vagrantfile and when processed executes the code relating to installing the plugin again and again and so on.

Here is my solution which avoids the loop.

# Plugins
#
# Check if the first argument to the vagrant
# command is plugin or not to avoid the loop
if ARGV[0] != 'plugin'

  # Define the plugins in an array format
  required_plugins = [
    'vagrant-vbguest', 'vagrant-hostmanager', 
    'vagrant-disksize'
  ]         
  plugins_to_install = required_plugins.select { |plugin| not Vagrant.has_plugin? plugin }
  if not plugins_to_install.empty?

    puts "Installing plugins: #{plugins_to_install.join(' ')}"
    if system "vagrant plugin install #{plugins_to_install.join(' ')}"
      exec "vagrant #{ARGV.join(' ')}"
    else
      abort "Installation of one or more plugins has failed. Aborting."
    end

  end
end

Question 6

Answer

Starx

You can stop the build at a certain stage and tag them as you want.

docker build --target test -t starx/test:latest .
docker build --target staging -t starx/staging:latest .
docker build --target prod -t starx/prod:latest .

This way, you have different images and you can push each image individually.

Question 7

Answer

Starx

You can split the string, like

String[] splits = stringToList.split(",");

And cast them to integer using something like Integer.parseInt(splits[0]); and store them in an ArrayList

Question 8

Answer

Starx

Ok, I manage to figure the problem out. The sass requires a home directory to operate correctly. If you are executing PHP as a system user, which in my case it was, it does not have a home directory, that is why it failed.

On Linux, you can use mkhomedir_helper [user] to create a home directory. Once you have created a home directory, sass will start to work.

Question 9

Answer

Starx

In MySQL 5.7, if you execute the query from Tom Mac’s answer, you will get the following error:

ERROR 3167 (HY000): The ‘INFORMATION_SCHEMA.SESSION_VARIABLES’ feature is disabled; see the documentation for ‘show_compatibility_56’

You should query performance_schema instead. Run the following:

SELECT variable_value FROM performance_schema.session_variables WHERE upper(variable_name) = 'BINLOG_FORMAT';

Question 10

Answer

Starx

$list = $tab_one['special_days']; // import list
$list = explode(PHP_EOL, $list); // split after new line

// At this point I will assume that you have a line like
// '06/28 > 5:00-23:00' in each list item 

$finalArray = []; // To store the array

foreach($list as $item) {
    $item = explode('>', $item); // split after ">"
    $finalArray[$item[0]] = explode(',', $item[1]);
}

var_dump($finalArray);

Note that the items exploded from $item[1] have not been trimmed so might have whitespaces.

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Why supervisord does not log my PHP CLI fwrite(STDOUT, "message")?

Albert’s Question:

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