Etcd terraform by Alex Somesan
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Alex Somesan his presentation at the Berlin Terraform User Group about setting up ETCD with Terraform.
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Node.js is a server-side JavaScript platform for building scalable network applications. It uses non-blocking I/O and event-driven architecture, which makes it very efficient for data-intensive real-time applications that run across distributed devices. Some key features of Node.js include CommonJS modules, child processes, HTTP servers, TCP servers, DNS lookups, file watching and a package management system. Popular applications built with Node.js include web frameworks, real-time applications, crawlers and streaming.
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Similar to Etcd terraform by Alex Somesan
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Fullstack conf 2017 - Basic dev pipeline end-to-end
## Tools
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Declarative & workflow based infrastructure with Terraform
Terraform allows users to define infrastructure as code to provision resources across multiple cloud platforms. It aims to describe infrastructure in a configuration file, provision resources efficiently by leveraging APIs, and manage the full lifecycle from creation to deletion. Key features include supporting composability across different infrastructure tiers, using a graph-based approach to parallelize operations for efficiency, and managing state to track resource unique IDs and allow recreating resources. Providers enable connectivity to different cloud APIs while resources define the specific infrastructure components and their properties.
Infrastructure as Code with Terraform
Session talk presented at Innosoft 2022.11.11 University of Sevilla.
Presented the concept of Infrastructure as Core and its practical approach using Hashicorp Terraform a a tool to provision in the cloud. Examples with AWS are provided in a Guthub repository.
Cassandra Summit 2014: Down with Tweaking! Removing Tunable Complexity for Ca...
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The need for performance tuning of the JVM and OS is making administrators the bottleneck for Cassandra deployments--especially in virtual environments. Over the past two years, the OSv project has profiled tuning-sensitive applications with a special focus on Cassandra. Today, many of the important bottlenecks for NoSQL applications are tunable on a conventional OS, but do not require tuning in the OSv environment. OSv gives Cassandra a simpler environment, set up to run one application in a single address space. This talk will cover how to use OSv to improve performance in key areas such as JVM memory allocation and network throughput--without loading up your to-do list with difficult tuning tasks.
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Etcd terraform by Alex Somesan
- 1. ETCD CLUSTERS ON AWS Terraform + CoreOS for 1
- 2. TEXT ABOUT ME ▸ Software engineer, Dev-Ops by chance ▸ Currently at reBuy.de, helping with migration to AWS ▸ Previously - 4 years at Amazon (AWS) 2
- 3. THE PREMISE WHAT IS ETCD? ▸ Distributed key-value store ▸ Based on Raft consensus algorithm ▸ Similar to Consul and ZooKeeper ▸ Used for storing state of distributed applications (Kubernetes, Fleet, CoreUpdate) ▸ Should be treated like a database ▸ Comes bundled with CoreOS 3
- 4. THE ENVIRONMENT TYPICAL ETCD DEPLOYMENT ▸ Odd number of instances ▸ Evenly distributed across AZs ▸ Low-latency connectivity between nodes ▸ Persistent storage (EBS) ▸ A way to determine the list of nodes 4
- 5. THE PROCESS BOOTSTRAPPING ETCD ▸ Nodes need prior knowledge about all other nodes ▸ The bootstrap phase is a one-off scenario ▸ Has support for discovering nodes (DNS SRV records) ▸ Can use discovery for clients 5
- 6. THE PROCESS …ON AWS ▸ Prepare CoreOS configuration (cloud-config) ▸ Launch node instances ▸ Create discovery DNS records ▸ Profit! 6
- 7. TERRAFORM + CoreOS FINDING THE NODES ▸ Through DNS SRV records ▸ Route53 private DNS inside VPC ▸ Nodes get a stable hostname (not ip-172-31-2-219.eu-west-1.compute.internal) 7
- 8. TERRAFORM + CoreOS resource "aws_route53_record" "etcd_srv_discover" { name = "_etcd-server._tcp" type = "SRV" records = ["${formatlist("0 0 2380 %s", aws_route53_record.etc_a_nodes.*.fqdn)}"] ttl = “300" zone_id = "${aws_route53_zone.etcd_zone.id}" } resource "aws_route53_record" "etc_a_nodes" { count = "${var.node_count}" type = "A" name = "node-${count.index}" records = ["${aws_instance.etcd_node.*.private_ip[count.index]}"] ttl = 300 zone_id = "${aws_route53_zone.etcd_zone.id}" } STABLE HOST NAMES 8 $ dig _etcd-server._tcp.cluster.etcd SRV _etcd-server._tcp.cluster.etcd. 183 IN SRV 0 0 2380 node-0.cluster.etcd. _etcd-server._tcp.cluster.etcd. 183 IN SRV 0 0 2380 node-1.cluster.etcd. _etcd-server._tcp.cluster.etcd. 183 IN SRV 0 0 2380 node-2.cluster.etcd.
- 9. TERRAFORM + COREOS CONFIGURING CoreOS ▸ Uses own version of cloud-init (subset of cloud-config) ▸ Config as EC2 user-data ▸ Template data-source for user-data ▸ Has to include hostname and DNS domain for discovery 9
- 10. TERRAFORM + CoreOS CoreOS CONFIG AS USERDATA #cloud-config hostname: ${node_name} coreos: update: reboot-strategy: "etcd-lock" etcd2: name: ${node_name} discovery-srv: ${cluster_domain} listen-peer-urls: "http://$private_ipv4:2380" listen-client-urls: "http://0.0.0.0:2379" initial-advertise-peer-urls: "http://${node_name}:2380" advertise-client-urls: "http://${node_name}:2379" units: - name: "etcd2.service" enable: false command: start 10 data "template_file" "userdata" { count = "${var.node_count}" template = "${file("${path.root}/../resources/userdata.yaml")}" vars { node_name = "node-${count.index}.${var.cluster_domain}" cluster_domain = "${var.cluster_domain}" } }
- 11. TERRAFORM + CoreOS LAUNCH NODES 11 resource "aws_instance" "etcd_node" { count = "${var.node_count}" ami = "${data.aws_ami.coreos_ami.id}" instance_type = "t2.medium" subnet_id = "${aws_subnet.az_subnet.*.id[count.index]}" key_name = "${aws_key_pair.ssh-key.id}" user_data = "${data.template_file.userdata.*.rendered[count.index]}" } $ terraform apply core@node-1 ~ $ etcdctl cluster-health member 5bea3befcd2b527d is healthy: got healthy result from http://node-2.cluster.etcd:2379 member bfc4d7d3459cc4cb is healthy: got healthy result from http://node-1.cluster.etcd:2379 member d1b3f464b49063ac is healthy: got healthy result from http://node-0.cluster.etcd:2379 cluster is healthy
- 12. DEMO ?! honourable crowd TERRAFORM + CoreOS 12
- 13. TERRAFORM + CoreOS THAT'S IT! Take-aways: ▸ etcd operations are deliberately “manual” ▸ etcd requires a source-of-truth for member list (Terraform) ▸ auto-scaling possible, but discouraged ▸ Route53 useful for service discovery 13
- 14. TERRAFORM + CoreOS QUESTIONS? Terraform module at: https://github.com/alexsomesan/tf-simple-etcd Get in touch! alex.somesan@gmail.com @ASomesan 14