This folder contains a Terraform module that can be used to deploy an Application Load
Balancer (ALB) in front of
your Couchbase and/or Sync Gateway cluster to:
Perform health checks on the servers in the cluster and automatically replace them when they fail.
Distribute traffic across Couchbase Server nodes. Note that you should ONLY use the load balancer for the Couchbase
Web Console and NOT any of the API paths (see the Couchbase FAQ
for more info).
Distribute traffic across multiple Sync Gateway nodes.
Note that this module solely deploys the Load Balancer, as you may want to share one load balancer across multiple
applications. To deploy Target Groups, health checks, and routing rules, use the
load-balancer-target-group
module.
This folder defines a Terraform module, which you can use in your
code by adding a module configuration and setting its source parameter to URL of this folder:
module"load_balancer" {
# TODO: replace <VERSION> with the latest version from the releases page: https://github.com/gruntwork-io/terraform-aws-couchbase/releases
source = "github.com/gruntwork/terraform-aws-couchbase//modules/load-balancer?ref=<VERSION>"
name = "couchbase-load-balancer"
vpc_id = "vpc-abcd1234"
subnet_ids = ["subnet-abcd1234", "subnet-efgh5678"]
http_listener_ports = [80]
https_listener_ports_and_certs = [
{
port = 443
certificate_arn = "arn:aws:acm:us-east-1:123456789012:certificate/12345678-1234-1234-1234-123456789012"
}
]
inbound_from_cidr_blocks = ["0.0.0.0/0"]
# ... See variables.tf for the other parameters you must define for this module
}
The above code will create a Load Balancer.
Note the following:
source: Use this parameter in the module to specify the URL of the load-balancer module. The double slash (//)
is intentional and required. Terraform uses it to specify subfolders within a Git repo (see module
sources). The ref parameter specifies a specific Git tag in
this repo. That way, instead of using the latest version of this module from the master branch, which
will change every time you run Terraform, you're using a fixed version of the repo.
http_listener_ports: Which ports the load balancer should listen on for HTTP requests.
https_listener_ports_and_certs: Whic ports the load balancer should listen on for HTTPS requests and which TLS
certs to use with those ports.
allow_inbound_from_cidr_blocks: Use this variable to specify which IP address ranges can connect to the Load
Balancer. You can also use allow_inbound_from_security_groups to allow specific security groups to connect.
How is the ALB configured?
The ALB in this module is configured as follows:
Listeners: The Load Balancer will create a listener for each port specified in http_listener_ports and
https_listener_ports_and_certs.
TLS certificates: Each port you specify via the https_listener_ports_and_certs should also include a
certificate_arn parameter to specify the ARN of a TLS certificate. This must be the ARN of a certificate in
ACM or
IAM.
DNS: You can use the route53_records variable to create one more more DNS A Records in Route
53 that point to the Load Balancer. This allows you to use custom domain names to
access the Load Balancer. Note that the TLS certificate you use with the HTTPS listener must be issued for the
same domain name(s)!
Questions? Ask away.
We're here to talk about our services, answer any questions, give advice, or just to chat.
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class=\"preview__body--title\" id=\"load-balancer\">Load Balancer</h1><div class=\"preview__body--border\"></div><p>This folder contains a <a href=\"https://www.terraform.io/\" class=\"preview__body--description--blue\" target=\"_blank\">Terraform</a> module that can be used to deploy an <a href=\"https://docs.aws.amazon.com/elasticloadbalancing/latest/application/introduction.html\" class=\"preview__body--description--blue\" target=\"_blank\">Application Load\nBalancer (ALB)</a> in front of\nyour Couchbase and/or Sync Gateway cluster to:</p>\n<ol>\n<li>Perform health checks on the servers in the cluster and automatically replace them when they fail.</li>\n<li>Distribute traffic across Couchbase Server nodes. Note that you should ONLY use the load balancer for the Couchbase\nWeb Console and NOT any of the API paths (see <a href=\"https://blog.couchbase.com/couchbase-101-q-and-a/\" class=\"preview__body--description--blue\" target=\"_blank\">the Couchbase FAQ</a>\nfor more info).</li>\n<li>Distribute traffic across multiple Sync Gateway nodes.</li>\n</ol>\n<p>Note that this module solely deploys the Load Balancer, as you may want to share one load balancer across multiple\napplications. To deploy Target Groups, health checks, and routing rules, use the\n<a href=\"/repos/v0.6.0/terraform-aws-couchbase/modules/load-balancer-target-group\" class=\"preview__body--description--blue\">load-balancer-target-group</a>\nmodule.</p>\n<p>See the <a href=\"/repos/v0.6.0/terraform-aws-couchbase/examples\" class=\"preview__body--description--blue\">examples folder</a> for fully\nworking sample code.</p>\n<h2 class=\"preview__body--subtitle\" id=\"how-do-you-use-this-module\">How do you use this module?</h2>\n<p>This folder defines a <a href=\"https://www.terraform.io/docs/modules/usage.html\" class=\"preview__body--description--blue\" target=\"_blank\">Terraform module</a>, which you can use in your\ncode by adding a <code>module</code> configuration and setting its <code>source</code> parameter to URL of this folder:</p>\n<pre><span class=\"hljs-keyword\">module</span> <span class=\"hljs-string\">\"load_balancer\"</span> {\n <span class=\"hljs-comment\"># <span class=\"hljs-doctag\">TODO:</span> replace <VERSION> with the latest version from the releases page: https://github.com/gruntwork-io/terraform-aws-couchbase/releases</span>\n source = <span class=\"hljs-string\">\"github.com/gruntwork/terraform-aws-couchbase//modules/load-balancer?ref=<VERSION>\"</span>\n \n name = <span class=\"hljs-string\">\"couchbase-load-balancer\"</span>\n vpc_id = <span class=\"hljs-string\">\"vpc-abcd1234\"</span>\n subnet_ids = [<span class=\"hljs-string\">\"subnet-abcd1234\"</span>, <span class=\"hljs-string\">\"subnet-efgh5678\"</span>]\n\n http_listener_ports = [<span class=\"hljs-number\">80</span>]\n\n https_listener_ports_and_certs = [\n {\n port = <span class=\"hljs-number\">443</span>\n certificate_arn = <span class=\"hljs-string\">\"arn:aws:acm:us-east-1:123456789012:certificate/12345678-1234-1234-1234-123456789012\"</span>\n }\n ]\n \n inbound_from_cidr_blocks = [<span class=\"hljs-string\">\"0.0.0.0/0\"</span>]\n\n <span class=\"hljs-comment\"># ... See variables.tf for the other parameters you must define for this module</span>\n}\n</pre>\n<p>The above code will create a Load Balancer.</p>\n<p>Note the following:</p>\n<ul>\n<li>\n<p><code>source</code>: Use this parameter in the <code>module</code> to specify the URL of the load-balancer module. The double slash (<code>//</code>)\nis intentional and required. Terraform uses it to specify subfolders within a Git repo (see <a href=\"https://www.terraform.io/docs/modules/sources.html\" class=\"preview__body--description--blue\" target=\"_blank\">module\nsources</a>). The <code>ref</code> parameter specifies a specific Git tag in\nthis repo. That way, instead of using the latest version of this module from the <code>master</code> branch, which\nwill change every time you run Terraform, you're using a fixed version of the repo.</p>\n</li>\n<li>\n<p><code>http_listener_ports</code>: Which ports the load balancer should listen on for HTTP requests.</p>\n</li>\n<li>\n<p><code>https_listener_ports_and_certs</code>: Whic ports the load balancer should listen on for HTTPS requests and which TLS\ncerts to use with those ports.</p>\n</li>\n<li>\n<p><code>allow_inbound_from_cidr_blocks</code>: Use this variable to specify which IP address ranges can connect to the Load\nBalancer. You can also use <code>allow_inbound_from_security_groups</code> to allow specific security groups to connect.</p>\n</li>\n</ul>\n<h2 class=\"preview__body--subtitle\" id=\"how-is-the-alb-configured\">How is the ALB configured?</h2>\n<p>The ALB in this module is configured as follows:</p>\n<ol>\n<li>\n<p><strong>Listeners</strong>: The Load Balancer will create a listener for each port specified in <code>http_listener_ports</code> and\n<code>https_listener_ports_and_certs</code>.</p>\n</li>\n<li>\n<p><strong>TLS certificates</strong>: Each port you specify via the <code>https_listener_ports_and_certs</code> should also include a\n<code>certificate_arn</code> parameter to specify the ARN of a TLS certificate. This must be the ARN of a certificate in\n<a href=\"https://aws.amazon.com/certificate-manager/\" class=\"preview__body--description--blue\" target=\"_blank\">ACM</a> or\n<a href=\"https://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_server-certs.html\" class=\"preview__body--description--blue\" target=\"_blank\">IAM</a>.</p>\n</li>\n<li>\n<p><strong>DNS</strong>: You can use the <code>route53_records</code> variable to create one more more DNS A Records in <a href=\"https://aws.amazon.com/route53/\" class=\"preview__body--description--blue\" target=\"_blank\">Route\n53</a> that point to the Load Balancer. This allows you to use custom domain names to\naccess the Load Balancer. Note that the TLS certificate you use with the HTTPS listener must be issued for the\nsame domain name(s)!</p>\n</li>\n</ol>\n","repoName":"terraform-aws-couchbase","repoRef":"v0.2.2","serviceDescriptor":{"serviceName":"Couchbase","serviceRepoName":"terraform-aws-couchbase","serviceRepoOrg":"gruntwork-io","cloudProviders":["aws"],"description":"Deploy a Couchbase cluster. Supports automatic bootstrapping, Sync Gateway, Web Console UI, cross-region replication, and auto healing.","imageUrl":"couchbase.png","licenseType":"open-source","technologies":["Terraform","Bash"],"compliance":[],"tags":[""]},"serviceCategoryName":"NoSQL","fileName":"README.md","filePath":"/modules/load-balancer","title":"Repo Browser: Couchbase","description":"Browse the repos in the Gruntwork Infrastructure as Code Library."}
.circleci
main.tf
