Web Server Problem Detect Procedure

SolutionsLinux

When a new server is setup or when it restarted, we encounter the problems like can not access the website every now and then. Mostly, we should just check firewall and selinux.

Firewall

For webserver, mysql, httpd, ssh are mandatory. So, firewall should not block any port of these service. Issue the following command, to check if it is permanently allowed.

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[root@localhost zac]# firewall-cmd --permanent --list-all
public
  target: default
  icmp-block-inversion: no
  interfaces: 
  sources: 
  services: dhcpv6-client http https mysql rsyncd ssh
  ports: 
  protocols: 
  masquerade: no
  forward-ports: 
  source-ports: 
  icmp-blocks: 
  rich rules:

SELinux

Sometimes SELinux is the potential a pain in the neck, normally I would stop it before rush into a weird problem.

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sestatus

# Disable
sudo setenforce 0

Open the /etc/selinux/config file and set the SELinux mod to disabled.

sudo shutdown -r now to make it work.