How to Start / Stop / Enable / Disable firewalld on CentOS 7

Status of firewalld

sudo systemctl status firewalld

Stop firewalld

sudo systemctl stop firewalld

Start firewalld

sudo systemctl start firewalld

Disable firewalld

sudo systemctl disable firewalld

Enable firewalld

sudo systemctl enable firewalld

Unmask firewalld if you got "Failed to start firewalld.service: Unit is masked."

sudo systemctl unmask firewalld


Edit /usr/lib/firewalld/services/svnserve.xml for subversion (add port 3690)

<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>svnserve</short>
  <description>This option allows you to access subversion (svn, svnserve).</description>
  <port protocol="udp" port="3690"/>
  <port protocol="tcp" port="3690"/>
</service>

Refer to
  1. http://blog.xuite.net/tolarku/blog/363801991-CentOS+7+Firewalld+%E9%98%B2%E7%81%AB%E7%89%86%E8%AA%AA%E6%98%8E%E4%BB%8B%E7%B4%B9
  2. https://www.rootusers.com/how-to-open-a-port-in-centos-7-with-firewalld/
  3. https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-using-firewalld-on-centos-7