arteurope

Datum 5.01.26

🔹 Troubleshooting

We proceeded step by step, as if we were investigating a crime scene 🕵️♂️:

1. Check installation & basic status

• dpkg -l | grep apache2 systemctl status apache2 apachectl configtest

  
  

  → Everything installed, config syntactically OK, but service inactive.

  
  



• Check logs

  
  



• journalctl -u apache2 -n 50 tail -n 50 /var/log/apache2/error.log

  
  

  → No entries → Indication of very early startup termination

  
  



• Check modules

  
  



• apachectl -M

  
  

  → Load all modules, no visible crash
  → Problem occurs after module load

  
  



• Direct foreground test

  
  



• sudo /usr/sbin/apachectl -e debug -DFOREGROUND

  
  

  → Start aborts after module load
  → No logs → Very typical for runtime dir / envvars problem

  
  



• Minimal start isolated

  
  



• sudo /usr/sbin/apache2 -X

  
  

  → Error message ${APACHE_RUN_DIR} is not defined → Runtime directory / envvars

  
  



• LDAP configuration analysis

  
  



• grep -R “ldap” /etc/apache2

  
  

  → Active LDAP modules that did not have a server, possible second startup problem

  
  



• Load envvars

  
  



• source /etc/apache2/envvars /usr/sbin/apache2 -DFOREGROUND

  
  

  → Now running without errors → envvars problem confirmed

  
  



• Deactivate LDAP modules

  
  



• sudo a2dismod ldap authnz_ldap ldap_userdir vhost_ldap

  
  

  → System startup possible, no further crashes

  
  



• Start Apache via systemd

  
  

1. sudo systemctl restart apache2 sudo systemctl status apache2

   
   

   → Stable service, port 80 occupied, everything running

   
   

🔹 Conclusion

• Main problem: envvars / runtime directory not set → startup aborted

  
  



• Secondary problem: LDAP modules active without LDAP → immediate crash

  
  



• Symptomatic consequences: No logs, no port binding, exit code 1

  
  



• Solution: Load envvars + deactivate LDAP modules → Apache runs stably again