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PowerGSLB - PowerDNS Remote GSLB Backend

PowerGSLB is a simple DNS based Global Server Load Balancing (GSLB) solution.

Table of Contents

Main features

  • Quick installation and setup
  • Written in Python 2.7
  • Built as PowerDNS Authoritative Server Remote Backend
  • Web based administration interface using w2ui
  • HTTPS support for the web server
  • DNS GSLB configuration stored in a MySQL / MariaDB database
  • Master-Slave DNS GSLB using native MySQL / MariaDB replication
  • Multi-Master DNS GSLB using native MySQL / MariaDB Galera Cluster
  • Modular architecture
  • Multithreaded architecture
  • Systemd status and watchdog support
  • Extendable health checks:
    • ICMP ping
    • TCP connect
    • HTTP request
    • Arbitrary command execution
  • Fallback if all the checks failed
  • Weighted (priority) records
  • Per record client IP / subnet persistence
  • DNS GSLB views support
  • All-in-one Docker image

Database diagram

Class diagram

Web based administration interface

Status grid

Advanced search

Add new record

More images

Installation on CentOS 7

Setup PowerGSLB and PowerDNS

yum -y install epel-release
yum -y update
yum -y install python2-pip

pip install pyping

yum -y --setopt=tsflags= install \
    "$VERSION/powergslb-$VERSION-1.el7.noarch.rpm" \
    "$VERSION/powergslb-admin-$VERSION-1.el7.noarch.rpm" \

sed -i 's/^password = .*/password = your-database-password-here/g' /etc/powergslb/powergslb.conf

cp /etc/pdns/pdns.conf /etc/pdns/pdns.conf~
cp "/usr/share/doc/powergslb-pdns-$VERSION/pdns/pdns.conf" /etc/pdns/pdns.conf

Setup MariaDB

yum -y install mariadb-server

sed -i '/\[mysqld\]/a bind-address=\ncharacter_set_server=utf8' /etc/my.cnf.d/server.cnf

systemctl enable mariadb.service
systemctl start mariadb.service
systemctl status mariadb.service


mysql -p << EOF
GRANT ALL ON powergslb.* TO powergslb@localhost IDENTIFIED BY 'your-database-password-here';
USE powergslb;
source /usr/share/doc/powergslb-$VERSION/database/scheme.sql
source /usr/share/doc/powergslb-$VERSION/database/data.sql

Start services

systemctl enable powergslb.service pdns.service
systemctl start powergslb.service pdns.service
systemctl status powergslb.service pdns.service

Test PowerGSLB

yum -y install bind-utils

dig @ SOA
dig @ A
dig @ AAAA
dig @ ANY

Web based administration interface

Open URL https://SERVER/admin/.

  • Default username: admin
  • Default password: admin

Health checks

Health checks are configured in the "Monitors" sidebar section in JSON format.

Supported check types:

type description
exec arbitrary command execution
icmp ICMP ping
http HTTP request
tcp TCP connect

Mandatory parameters

General parameters for all checks:

parameter description
type check type
interval interval between checks
timeout check timeout
fall number of failed checks to disable record
rise number of successful checks to enable record

Exec parameters

parameter description
type exec
args command to execute and arguments


{"type": "exec", "args": ["/etc/powergslb/powergslb-check", "%(content)s"], "interval": 3, "timeout": 1, "fall": 3, "rise": 5}

ICMP parameters

parameter description
type icmp
ip endpoint IP address


{"type": "icmp", "ip": "%(content)s", "interval": 3, "timeout": 1, "fall": 3, "rise": 5}

HTTP parameters

parameter description
type http
url endpoint URL


{"type": "http", "url": "http://%(content)s/status", "interval": 3, "timeout": 1, "fall": 3, "rise": 5}

TCP parameters

parameter description
type tcp
ip endpoint IP address
port endpoint port number


{"type": "tcp", "ip": "%(content)s", "port": 80, "interval": 3, "timeout": 1, "fall": 3, "rise": 5}

Building PowerGSLB RPM packages

You should always create RPM packages in a clean environment and preferably on a separate machine!

Please read How to create an RPM package.

yum -y update
yum -y install @Development\ Tools

curl "$VERSION" -o "powergslb-$VERSION.tar.gz"
rpmbuild -tb --define "version $VERSION" "powergslb-$VERSION.tar.gz"

Upon successful completion you will have three packages


Using PowerGSLB Docker image

For quick setup, you can pull all-in-one Docker image from


docker pull"$VERSION"

docker run -it --name powergslb --hostname powergslb \
    -p 53:53/tcp -p 53:53/udp -p 443:443/tcp \
    --tmpfs /run --tmpfs /tmp -v /sys/fs/cgroup:/sys/fs/cgroup:ro \"$VERSION"

docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' powergslb

docker exec -it powergslb bash

docker stop powergslb

For systemd to run in Docker container the following SELinux boolean should be enabled.

semanage boolean --modify --on container_manage_cgroup

Building PowerGSLB Docker image

To create an all-in-one Docker image.


docker build -f docker/Dockerfile --build-arg VERSION="$VERSION" \
    --force-rm --no-cache -t powergslb:"$VERSION"