Opening the Firewall up for Salt¶
The Salt master communicates with the minions using an AES-encrypted ZeroMQ connection. These communications are done over ports 4505 and 4506, which need to be accessible on the master only. This document outlines suggested firewall rules for allowing these incoming connections to the master.
Note
No firewall configuration needs to be done on Salt minions. These changes refer to the master only.
RHEL 6 / CENTOS 6¶
The lokkit command packaged with some linux distributions makes opening iptables firewall ports very simple via the command line. Just be careful to not lock out access to the server by neglecting to open the ssh port.
lokkit example
lokkit -p 22:tcp -p 4505:tcp -p 4506:tcp
The system-config-firewall-tui command provides a text-based interface to modifying the firewall.
system-config-firewall-tui
system-config-firewall-tui
iptables¶
Different Linux distributions store their iptables rules in different places, which makes it difficult to standardize firewall documentation. Included are some of the more common locations, but your mileage may vary.
Fedora / RHEL / CentOS
/etc/sysconfig/iptables
Arch Linux
/etc/iptables/iptables.rules
Debian
Follow these instructions: http://wiki.debian.org/iptables
Once you've found your firewall rules, you'll need to add the two lines below to allow traffic on tcp/4505 and tcp/4506:
-A INPUT -m state --state new -m tcp -p tcp --dport 4505 -j ACCEPT
-A INPUT -m state --state new -m tcp -p tcp --dport 4506 -j ACCEPT
Ubuntu
Create a file named /etc/ufw/applications.d/salt-master
[Salt Master]
title=Salt master
description=Salt is a remote execution and configuration management tool.
ports=4505,4506/tcp
pf.conf¶
The BSD-family of operating systems uses packet filter (pf). The following example describes the additions to pf.conf needed to access the Salt master.
pass in on $int_if proto tcp from any to $int_if port 4505
pass in on $int_if proto tcp from any to $int_if port 4506
Once these additions have been made to the pf.conf the rules will need to be reloaded. This can be done using the pfctl command.
pfctl -vf /etc/pf.conf
