Install and Configure PHPMyAdmin on Elastic Beanstalk

phpmyadmin.config

container_commands:
  01_install_pma:
    test: test -n "$PMA_VER" && test ! -f /tmp/phpmyadmin.tar.gz
    command: |
      cd /tmp
      wget https://files.phpmyadmin.net/phpMyAdmin/${PMA_VER}/phpMyAdmin-${PMA_VER}-all-languages.tar.gz
      wget https://files.phpmyadmin.net/phpMyAdmin/${PMA_VER}/phpMyAdmin-${PMA_VER}-all-languages.tar.gz.sha1
      cd /tmp && sha1sum --check phpMyAdmin-${PMA_VER}-all-languages.tar.gz.sha1
      if [[ $? == 0 ]]
      then
        cd /opt/ && tar xzf /tmp/phpMyAdmin-${PMA_VER}-all-languages.tar.gz && ln -s phpMyAdmin-${PMA_VER}-all-languages phpmyadmin
      else
        exit 1
      fi
      exit 0

  02_create_config_file:
    test: test ! -f /opt/phpmyadmin/config.inc.php
    command: cd /opt/phpmyadmin && cp config.sample.inc.php config.inc.php

  03_change_auth_type:
    test: test -f /opt/phpmyadmin/config.inc.php
    command: sed -i "s/'cookie'/\'config'/g" /opt/phpmyadmin/config.inc.php

  04_configure_db_host:
    test: test -f /opt/phpmyadmin/config.inc.php
    command: sed -i "s/'localhost'/\$_SERVER['RDS_HOSTNAME']/g" /opt/phpmyadmin/config.inc.php

  05_config_db_credentials:
     command: |
      grep -q "RDS_USERNAME" /opt/phpmyadmin/config.inc.php || sed -i "/RDS_HOSTNAME/i \
        \$cfg['Servers'][\$i]['user'] = \$_SERVER['RDS_USERNAME'];\n\$cfg['Servers'][\$i]['password'] = \$_SERVER['RDS_PASSWORD'];" /opt/phpmyadmin/config.inc.php

  06_configure_htauth:
    test: test -n "$PMA_USERNAME" && test -n "$PMA_PASSWORD"
    command: |
      if [[ -f /etc/httpd/htpasswd ]]
      then
        htpasswd -b /etc/httpd/htpasswd $PMA_USERNAME $PMA_PASSWORD
      else
        htpasswd -cb /etc/httpd/htpasswd $PMA_USERNAME $PMA_PASSWORD
      fi
      
files:
  "/etc/httpd/conf.d/pma.conf":
    mode: "000644"
    owner: root
    group: root
    content: |
      Alias /db_admin /opt/phpmyadmin
      <Directory /opt/phpmyadmin>
        AuthType Basic
        AuthName "Restricted Files"
        AuthBasicProvider file
        AuthUserFile "/etc/httpd/htpasswd"
        Require valid-user
        Options FollowSymLinks
      </Directory>
      <Directory /opt/phpmyadmin/libraries/>
        Require all denied
      </Directory>
      <Directory /opt/phpmyadmin/setup/lib/>
        Require all denied
      </Directory>
      <Directory /opt/phpmyadmin/setup/frames/>
        Require all denied
      </Directory>

You sir are a gentleman and a scholar! +1

Hi I'm able to get the phpmyadmin installed, but once I logged in, a warning

"The $cfg['TempDir'] (./tmp/) is not accessible. phpMyAdmin is not able to cache templates and will be slow because of this."

What am I missing?