# Centos allow connection between containers

When container was create with docker-compose, ping are allowed between container but http, sql and other ports connections are blocked.

For allow the connection:

```bash
sudo firewall-cmd --zone=public --add-masquerade --permanent
sudo firewall-cmd --permanent --zone=public --change-interface=docker0
sudo firewall-cmd --permanent --direct --add-rule ipv4 filter INPUT 4 -i docker0 -j ACCEPT
sudo firewall-cmd --permanent --zone=public --add-port=[YOURPORT]/tcp
```

Replace [YOURPORT] by the port to allow (80,3306...)

## Source

→ [Centos Forum - firewalld and docker](https://forums.centos.org/viewtopic.php?t=72558)