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+Set Up and Configure a Firewall with FirewallD on CentOS 7
+============================================================
+
+ ![](https://www.rosehosting.com/blog/wp-content/uploads/2017/02/set-up-and-configure-a-firewall-with-firewalld-on-centos-7.jpg) 
+
+FirewallD is a firewall management tool available by default on CentOS 7 servers. Basically, it is a wrapper around iptables and it comes with graphical configuration tool firewall-config and command line tool firewall-cmd. With the iptables service, every change requires flushing of the old rules and reading the new rules from the `/etc/sysconfig/iptables` file, while with firewalld only differences are applied.
+
+### FirewallD zones
+
+FirewallD uses services and zones instead of iptables rules and chains. By default the following zones are available:
+
+*   drop – Drop all incoming network packets with no reply, only outgoing network connections are available.
+*   block – Reject all incoming network packets with an icmp-host-prohibited message, only outgoing network connections are available.
+*   public – Only selected incoming connections are accepted, for use in public areas
+*   external For external networks with masquerading enabled, only selected incoming connections are accepted.
+*   dmz – DMZ demilitarized zone, publicly-accessible with limited access to the internal network, only selected incoming connections are accepted.
+*   work – For computers in your home area, only selected incoming connections are accepted.
+*   home – For computers in your home area, only selected incoming connections are accepted.
+*   internal -For computers in your internal network, only selected incoming connections are accepted.
+*   trusted – All network connections are accepted.
+
+To list all available zones run:
+
+```
+# firewall-cmd --get-zones
+work drop internal external trusted home dmz public block
+```
+
+To list the default zone:
+
+```
+# firewall-cmd --get-default-zone
+public
+```
+
+To change the default zone:
+
+```
+# firewall-cmd --set-default-zone=dmz
+# firewall-cmd --get-default-zone
+dmz
+```
+
+### FirewallD services
+
+FirewallD services are xml configuration files, with information of a service entry for firewalld. TO list all available services run:
+
+```
+# firewall-cmd --get-services
+amanda-client amanda-k5-client bacula bacula-client ceph ceph-mon dhcp dhcpv6 dhcpv6-client dns docker-registry dropbox-lansync freeipa-ldap freeipa-ldaps freeipa-replication ftp high-availability http https imap imaps ipp ipp-client ipsec iscsi-target kadmin kerberos kpasswd ldap ldaps libvirt libvirt-tls mdns mosh mountd ms-wbt mysql nfs ntp openvpn pmcd pmproxy pmwebapi pmwebapis pop3 pop3s postgresql privoxy proxy-dhcp ptp pulseaudio puppetmaster radius rpc-bind rsyncd samba samba-client sane smtp smtps snmp snmptrap squid ssh synergy syslog syslog-tls telnet tftp tftp-client tinc tor-socks transmission-client vdsm vnc-server wbem-https xmpp-bosh xmpp-client xmpp-local xmpp-server
+```
+
+xml configuration files are stored in the `/usr/lib/firewalld/services/` and `/etc/firewalld/services/`directories.
+
+### Configuring your firewall with FirewallD
+
+As an example, here is how you can configure your [RoseHosting VPS][6] firewall with FirewallD if you were running a web server, SSH on port 7022 and mail server.
+
+First we will set the default zone to dmz.
+
+```
+# firewall-cmd --set-default-zone=dmz
+# firewall-cmd --get-default-zone
+dmz
+```
+
+To add permanent service rules for HTTP and HTTPS to the dmz zone, run:
+
+```
+# firewall-cmd --zone=dmz --add-service=http --permanent
+# firewall-cmd --zone=dmz --add-service=https --permanent
+```
+
+Open port 25 (SMTP) and port 465 (SMTPS) :
+
+```
+firewall-cmd --zone=dmz --add-service=smtp --permanent
+firewall-cmd --zone=dmz --add-service=smtps --permanent
+```
+
+Open, IMAP, IMAPS, POP3 and POP3S ports:
+
+```
+firewall-cmd --zone=dmz --add-service=imap --permanent
+firewall-cmd --zone=dmz --add-service=imaps --permanent
+firewall-cmd --zone=dmz --add-service=pop3 --permanent
+firewall-cmd --zone=dmz --add-service=pop3s --permanent
+```
+
+Since the SSH port is changed to 7022, we will remove the ssh service (port 22) and open port 7022
+
+```
+firewall-cmd --remove-service=ssh --permanent 
+firewall-cmd --add-port=7022/tcp --permanent 
+```
+
+To implement the changes we need to reload the firewall with:
+
+```
+firewall-cmd --reload
+```
+
+Finally, you can list the rules with:
+
+### firewall-cmd –list-all
+
+```
+dmz
+target: default
+icmp-block-inversion: no
+interfaces:
+sources:
+services: http https imap imaps pop3 pop3s smtp smtps
+ports: 7022/tcp
+protocols:
+masquerade: no
+forward-ports:
+sourceports:
+icmp-blocks:
+rich rules:
+```
+
+* * *
+
+Of course, you don’t have to do any of this if you use one of our [CentOS VPS hosting][7] services, in which case you can simply ask our expert Linux admins to setup this for you. They are available 24×7 and will take care of your request immediately.
+
+PS. If you liked this post please share it with your friends on the social networks using the sharing buttons or simply leave a reply below. Thanks.
+
+--------------------------------------------------------------------------------
+
+via: https://www.rosehosting.com/blog/set-up-and-configure-a-firewall-with-firewalld-on-centos-7/
+
+作者：[rosehosting.com][a]
+译者：[译者ID](https://github.com/译者ID)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]:https://www.rosehosting.com/blog/set-up-and-configure-a-firewall-with-firewalld-on-centos-7/
+[1]:https://www.rosehosting.com/blog/set-up-and-configure-a-firewall-with-firewalld-on-centos-7/
+[2]:https://www.rosehosting.com/blog/set-up-and-configure-a-firewall-with-firewalld-on-centos-7/#comments
+[3]:https://www.rosehosting.com/blog/category/tips-and-tricks/
+[4]:https://plus.google.com/share?url=https://www.rosehosting.com/blog/set-up-and-configure-a-firewall-with-firewalld-on-centos-7/
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