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#Configure forward and reverse lookup zones ubuntu 16.04 install
#Configure forward and reverse lookup zones ubuntu 16.04 series

A direct model is also available with HAProxy alone (without ELB or ALB), but it is more complex due to having to configure AWS Identity and Access Management policies, and it requires more in-depth knowledge of the AWS’ inner workings.

Both ELB and ALB variants will be described in this blog post. A similar alternative is available using Amazon Application Load Balancer (ALB). The HAProxy instances then listen to private IP addresses and reverse proxy the requests to the application servers.

The simplest method is to use the Amazon Elastic Load Balancing (ELB) and have it serve as a front-facing load balancer and a reverse proxy for multiple HAProxy instances.

There are several methods available for an Amazon high availability load balancer setup with HAProxy: Ubuntu images are based on the current Ubuntu LTS 16.04.3 Xenial release, while Red Hat Enterprise images are based on the official Red Hat Enterprise 7.4 GA.

HAProxy Enterprise – Red Hat Enterprise Linux 7 AMI.

The HAProxy Enterprise Amazon AMI options available are: BYOL versions are also going to be available very soon. This release contains all standard and additional HAProxy Enterprise features, it is optimized towards cloud usage, and it comes with Amazon CloudFormation integration tools and support for Amazon Enhanced Networking with a network interrupt tuning and pinning.

#Configure forward and reverse lookup zones ubuntu 16.04 install

For HAProxy Community, please use your favorite operating system’s Amazon AMI image and install a recent version of HAProxy on it.įor HAProxy Enterprise, we have recently released HAProxy Enterprise version 1.7r2 for Amazon Elastic Compute Cloud EC2. That high-availability setup can be implemented using HAProxy Community or HAProxy Enterprise. In this blog post, we are going to show the most straightforward method – HAProxy used in combination with Amazon Elastic Load Balancing (ELB) and Amazon Application Load Balancer (ALB).

#Configure forward and reverse lookup zones ubuntu 16.04 series

There are a few different approaches possible, and this is the first in a series of three blog posts to describe them. There has been a constant stream of interest in running high-availability HAProxy configurations on Amazon. Simply uncomment and edit /etc/bind/ blog post is part of our AWS Best Practices series. The default configuration acts as a caching server. All the while providing caching services for hosts on the local LAN. A server can be the Start of Authority (SOA) for one zone, while providing secondary service for another zone. It is possible to configure the same server to be a caching name server, primary, and secondary: it all depends on the zones it is serving. This is now provided instead by the /usr/share/dns/root.hints file shipped with the dns-root-data package, and is referenced in the -zones configuration file above. The root nameservers used to be described in the file /etc/bind/db.root.

/etc/bind/-zones: default zones such as localhost, its reverse, and the root hints.

The primary configuration file is /etc/bind/nf, which in the layout provided by the package just includes these files. The DNS configuration files are stored in the /etc/bind directory.

When configured as a caching nameserver BIND9 will find the answer to name queries and remember the answer when the domain is queried again.Īs a primary server, BIND9 reads the data for a zone from a file on its host and is authoritative for that zone.Īs a secondary server, BIND9 gets the zone data from another nameserver that is authoritative for the zone. Some of the most common configurations are a caching nameserver, primary server, and secondary server. Very often these tools will be installed already, but to check and/or install dnsutils enter the following: sudo apt install dnsutils InstallationĪt a terminal prompt, enter the following command to install dns: sudo apt install bind9Ī very useful package for testing and troubleshooting DNS issues is the dnsutils package. Ubuntu ships with BIND (Berkley Internet Naming Daemon), the most common program used for maintaining a name server on Linux.

Computers that run DNS are called name servers. In this way, DNS alleviates the need to remember IP addresses. Domain Name Service (DNS) is an Internet service that maps IP addresses and fully qualified domain names (FQDN) to one another.