From development environments to production deployments with Docker, Compose, Machine, Swarm, and ECS CLI - Comment
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In this session, we will learn how to define and run multi-container applications with Docker Compose. Then, we will show how to deploy and scale them seamlessly to a cluster with Docker Swarm; and how Amazon EC2 Container Service (ECS) eliminates the need to install,operate, and scale your own cluster management infrastructure. We will also walk through some best practice patterns used by customers for running their microservices platforms or batch jobs. Sample code and Compose templates will be provided on GitHub afterwards. Topics covered in this presentation slides: 1. © 2015, Amazon Web Services, Inc. or its Affiliates. All rights reserved. Jérôme Petazzoni Docker Inc. From Local Docker Development to Production Deployments 2. What to Expect from the Session We will talk about ... ● Docker Compose for development environments ● taking those environments to production – Docker cluster provisioning – container image building and deployment – service discovery ● Compose, Machine, Swarm, ECS We expect that you are familiar with Docker fundamentals! 3. Introductions ● Jérôme Petazzoni (@jpetazzo) ● Since 2010: putting things in containers at dotCloud – polyglot PAAS – microservices – provisioning, metrics, scaling ... – massive deployment of LXC ● Since 2013: putting things in containers at Docker (reminder: dotCloud became Docker in 2013...) ● 5 years of experience on a 2 years old technology! 4. Introductions, take 2 ● Hi, I'm Jérôme ● I'm a Software Engineer about to start a new gig! ● Tomorrow for my first day I will work on DockerCoins* ● (It's a cryptocurrency-blockchain-something system) ● My coworkers are using Docker all over the place ● My task will be to deploy their stack at scale *Fictious project name; you can't buy pizzas or coffee with DockerCoins (yet). 5. Getting ready 6. Preparing for my first day ● I just received my new laptop! ● The only instructions where: “Install the Docker Toolbox.” ● ~180 MB download for Windows and OS X 7. Video: https://www.youtube.com/watch?v=g-g94H_AiOE 8. Developing with Compose 9. The Compose on-boarding workflow ● Three simple steps: 1) git clone 2) docker-compose up 3) open app in browser 10. DEMO Video: https://www.youtube.com/watch?v=sk3yYh1MgE0 11. How does this work? ● “docker-compose up” tells Compose to start the app ● If needed, the app is built first ● How does Compose know what to do? ● It reads the “Compose file” (docker-compose.yml) 12. docker-compose.yml — simple application web: build: . ports: - "80:5000" links: - redis redis: image: redis 13. docker-compose.yml — complex application rng: build: rng ports: - "8001:80" hasher: build: hasher ports: - "8002:80" redis: image: redis worker: build: worker links: - rng - hasher - redis webui: build: webui links: - redis ports: - "8000:80" volumes: - "./webui/files/:/files/" 14. How does this work? ● Application is broken down into services ● Each service is mapped to a container ● Each container can come from: – a pre-built image in a library called “registry” – a build recipe called “Dockerfile” ● The Compose file defines all those services (and their parameters: storage, network, env vars...) 15. DEMO ● show docker-compose.yml file and highlight services ● show a couple of services 16. Our sample application ● Microservices architecture ● Different languages and frameworks – Ruby + Sinatra – Python + Flask – Node.js + Express ● Different kinds of services – background workers – web services with REST API – stateful data stores – web front-ends 17. Mandatory plug on microservices ● Advantages of microservices: – enables small teams (Jeff Bezos two-pizza rule) – enables “right tool for the right job” – services can be deployed/scaled independently – look for e.g. “Adrian Cockroft Microservices” talks ● Drawbacks to microservices: – distributed systems are hard (cf. aphyr.com if you have doubts) – load balancing, service discovery become essential – look for e.g. “Microservices Not A Free Lunch” article 18. Deploying on a Cloud Instance ● Same workflow: 1) ssh into remote Docker Host 2) git clone 3) docker-compose up 4) open app in browser ● Let's see a real demo! 19. DEMO ● ssh and repeat 20. DEMO ● git clone git://github.com/jpetazzo/dockercoins ● cd dockercoins ● docker-compose up ● open app (instance address, port 8000) ● ^C 21. The Compose development workflow ● Four simple steps: 1) edit code 2) docker-compose build 3) docker-compose up 4) reload app in browser 22. DEMO ● edit webui/files/index.html ● change css ● docker-compose build ● docker-compose up ● reload app ● ^C Video: https://www.youtube.com/watch?v=O3Bps01THBQ 23. Compose take-aways ● Docker abstracts the environment for us ● Any Docker host is a valid deployment target: – local environment (with the Docker Toolbox) – on-demand cloud instances (with Docker Machine) – bring-Your-Own-Server (for on-prem and hybrid strategies) ● Frictionless on-boarding (and context-switching) ● But how do we deploy to production, at scale? 24. What's missing ● Cluster provisioning ● Building and deploying code ● Service discovery (Non-exhaustive list.) Let's see how to address those points. We will dive into details — and give more live demos! 25. Provisioning a cluster 26. Provisioning ● Manual instance creation (CLI or Console) ● AWS CLI scripting ● Auto Scaling Groups ● CloudFormation templates ● Docker Machine ● ECS CLI 27. Docker Machine ● Docker Machine comes with the Docker Toolbox ● Can create Docker hosts on: – EC2 and other clouds – local environments (VirtualBox, OpenStack…) ● Can create clusters using Docker Swarm ● Current limitations (but expect this to improve): – one machine at a time – centralized credentials 28. DEMO export TOKEN=$(docker run swarm create) echo $TOKEN docker-machine create -d amazonec2 --swarm --swarm-master --swarm-discovery token://$TOKEN node00 & for N in $(seq 1 4); do sleep 3 docker-machine create -d amazonec2 --swarm --swarm-discovery token://$TOKEN node0$N & done wait Video: https://www.youtube.com/watch?v=LFjwusorazs 29. ECS CLI ● Sneak peek! ● State-of-the-art cluster creation ● Following AWS best practices: – CloudFormation template – Auto Scaling Group – IAM integration 30. DEMO ● ecs-cli configure ● ecs-cli up --keypair jpetazzo --capability-iam --size 10 ● (add elastic load balancer) ● (associate load balancer with auto scaling group) ● (add DNS entry) ● (configure security groups for ELB and ASG) Video: https://www.youtube.com/watch?v=KqEpIDFxjNc 31. Building and deploying code 32. Building and deploying with Docker ● Let's continue to use Compose to build our app images ● And store those images in a Docker Registry – Docker Hub (SAAS à la GitHub, free for public images) – Docker Trusted Registry (commercial offering; available e.g. through AWS marketplace) – self-hosted, community version 33. The plan ● Each time we need to deploy: 1) build all containers with Compose 2) tag all images with a unique version number 3) push all images to our Registry 4) generate a new docker-compose.yml file, referencing the images that we just built and pushed ● This will be done by a script 34. You get a script! And you get a script! Everybody gets a script! ● All the scripts that we will use here are on GitHub ● Feel free to use them, copy them, adapt them, etc. URL: https://github.com/jpetazzo/orchestration-workshop (Don't panic, URL will be shown again at the end of the presentation) 35. DEMO ● build-tag-push.py ● inspect the resulting YAML file Those images are now frozen. They'll stay around “forever” if we need them again. (e.g. to do a version rollback) See: https://hub.docker.com/r/jpetazzo/dockercoins_webui/tags/ 36. Service discovery 37. Why do we need service discovery? ● Service A needs to talk to service B ● How does A know how to talk to B? – service A needs: address, port, credentials ● What if there are multiple instances of B? – examples: load balancing, replication ● What if B location changes over time? – examples: scaling, fail-over ● Service discovery addresses those concerns 38. Service discovery, seen by devs 39. Hard-coded service discovery ● Development setup: $db = mysql_connect(“localhost”); cache = Redis.new(:host => "localhost", :port => 16379) conn, err := net.Dial("tcp", "localhost:8000”) 40. Hard-coded service discovery ● Other development setup: $db = mysql_connect(“192.168.1.2”); cache = Redis.new(:host => "192.168.1.3", :port => 6380) conn, err := net.Dial("tcp", "192.168.1.4:8080”) 41. Hard-coded service discovery ● Production setup: $db = mysql_connect( “foo.rds.amazonaws.com”, “produser”, “sesame”); cache = Redis.new( :url => "redis://:p4ssw0rd@redis-as-a-service.io/15”) conn, err := net.Dial( "tcp", "api-42.elb.amazonaws.com:80”) 42. Hard-coded service discovery ● Requires many code edits to change environment ● Error-prone ● Big, repetitive configuration files often land in the repo ● Adding a new service requires editing all those configs ● Maintenance is expensive (S services × E environments) ● � 43. Twelve-factor App ● Environment variables $db = mysql_connect( $_ENV[“DB_HOST”], $_ENV[“DB_USER”], $_ENV[“DB_PASS”]) cache = Redis.new( :url => "redis://:#{ENV[“REDIS_PASS”]}@” + “#{ENV[“REDIS_HOST]}:#{ENV[“REDIS_PORT]}/” + “#{ENV[“REDIS_DB”]}”) conn, err := net.Dial( "tcp", os.ExpandEnv("${API_HOST}:${API_PORT}”)) 44. Twelve-factor App ● Separates cleanly code and environment variables (environment is literally defined by environment variables) ● Still requires to maintain configuration files (containing lists of environment variables) ● Production parameters are easier to keep out of the repo ● Dramatic errors are less likely to happen ● � 45. Configuration database ● Dynamic lookups (here with Zookeeper) $zk = new Zookeeper('127.0.0.1:2181'); mysql_connect( $zk→get('/apps/foo/prod/db/host') $zk→get('/apps/foo/prod/db/user') $zk→get('/apps/foo/prod/db/pass')) zk = Zookeeper.new('127.0.0.1:2181') redis_pass = zk.get(:path => '/apps/foo/prod/redis/pass') redis_host = zk.get(:path => '/apps/foo/prod/redis/host') redis_port = zk.get(:path => '/apps/foo/prod/redis/port') redis_db = zk.get(:path => '/apps/foo/prod/redis/db') cache = Redis.new( :url => "redis://:#{redis_pass}@#{redis_host}:#{redis_port}/#{redis_db}”) c, _, err := zk.Connect([]string{"127.0.0.1"}, time.Second) api_host, _, err := c.get(“/apps/foo/prod/api/host”) api_port, _, err := c.get(“/apps/foo/prod/api/port”) conn, err := net.Dial(“tcp”', fmt.Sprintf(“%s:%s”, api_host, api_port)) 46. Configuration database ● If you want the same code in dev and prod, you need to deploy your config DB in dev too ● Instead of maintaining config files, you maintain Zookeeper* clusters and fixtures ● … or have different lookup logic for dev and prod ● � *Or your other favorite config DB, e.g. etcd, Consul... 47. Local load balancing / routing ● Connect to well-known location $db = mysql_connect(“localhost”); cache = Redis.new(:host => "localhost") conn, err := net.Dial("tcp", "localhost:8001”) ● In dev: all components run locally ● In prod: local load balancer routes the traffic (example: AirBNB's SmartStack) 48. Local load balancing / routing ● Code can be identical in dev and prod ● Deployment will differ: – direct connection in dev – proxies, routers, load balancers in prod ● “Configuration” is merely a static port allocation map (indicating which service listens on which port) ● Way easier for devs; however ops still have work to do ● � 49. The ambassador pattern 50. Our code base with ambassadors ● Use well-known DNS names $db = mysql_connect(“db”); cache = Redis.new(:host => "redis") conn, err := net.Dial("tcp", "api:80”) 51. Running in dev worker 172.17.0.4 worker 172.17.0.4 rng 172.17.0.2 rng 172.17.0.2 hasher 172.17.0.1 hasher 172.17.0.1 webui 172.17.0.5 webui 172.17.0.5 redis 172.17.0.3 redis 172.17.0.3 Let's populate a custom /etc/hosts file in each container, referencing the services that it needs to connect to. e.g. on “worker”: 172.17.0.1 hasher 172.17.0.2 rng 172.17.0.3 redis ContainerContainerHostHost 52. Another dev environment worker 10.0.0.20 worker 10.0.0.20 rng 10.0.0.15 rng 10.0.0.15 hasher 10.0.0.10 hasher 10.0.0.10 webui 10.0.0.4 webui 10.0.0.4 redis 10.0.0.12 redis 10.0.0.12 The addressing is different, but the code remains the same. /etc/hosts on “worker”: 10.0.0.10 hasher 10.0.0.15 rng 10.0.0.12 redis ContainerContainerHostHost 53. Some good news worker 172.17.0.4 worker 172.17.0.4 rng 172.17.0.2 rng 172.17.0.2 hasher 172.17.0.1 hasher 172.17.0.1 webui 172.17.0.5 webui 172.17.0.5 redis 172.17.0.3 redis 172.17.0.3 Compose automatically does this for us, using Docker “links.” Links populate /etc/hosts. Our dev environment is already taken care of! But what about our production setup on multiple hosts? ContainerContainerHostHost 54. Running in prod worker 172.17.0.4 worker 172.17.0.4 rng 172.17.0.2 rng 172.17.0.2 hasher 172.17.0.1 hasher 172.17.0.1 redis 172.17.0.3 redis 172.17.0.3 Worker doesn't talk to actual instances of redis, hasher, and rng, but to ambassadors. Ambassadors will route* the traffic to the destination. *Or forward, load-balance, proxy... ContainerContainerHostHost AmbassadorAmbassador 55. Running in prod worker 172.17.0.4 worker 172.17.0.4 rng 172.17.0.2 rng 172.17.0.2 hasher 172.17.0.1 hasher 172.17.0.1 redis 172.17.0.3 redis 172.17.0.3 redis 172.17.0.6 redis 172.17.0.6 hasher 172.17.0.8 hasher 172.17.0.8 rng 172.17.0.5 rng 172.17.0.5 rng 172.17.0.4 rng 172.17.0.4 webui 172.17.0.8 webui 172.17.0.8 redis 172.17.0.7 redis 172.17.0.7 ContainerContainerHostHost AmbassadorAmbassador 56. Using ambassadors ● Code remains readable and clean ● Plumbing (service discovery, routing, load balancing, etc.) is abstracted away (somebody still has to do it, though!) ● Plumbing doesn't encumber our dev environment ● Changes in plumbing won't impact the code base ● � 57. Service discovery, seen by ops 58. How fast are we moving? 59. Moving slowly ● Code deployment is infrequent: – every week, on a regular schedule – a bit of downtime is OK (a few minutes, maybe one hour) ● Failures are rare (less than 1/year) and/or don't have critical impact ● Reconfigurations are not urgent: – we bake them in the deployment process – it's OK if they disrupt service or cause downtime 60. Strategy for apps moving slowly ● Bake configuration and parameters with the deployment (reconfiguration = rebuild, repush, redeploy) ● Or configure manually after deployment (!) ● In case of emergency: SSH+vi (!) 61. Results ● Advantages – zero cost upfront – easy to understand* ● Drawbacks – each deployment, each change = risk – expensive in the long run *Except for your boss when your app is down and it takes a while to bring it back up 62. Moving mildly ● Code deployment: – happens every day – downtime is not OK (except maybe very short glitches) ● Failures happen regularly; they must be resolved quickly ● Reconfigurations are frequent: – scaling up/down; moving workloads; changing databases – altering application parameters for A/B testing 63. Strategy for apps moving mildly ● Inject configuration after the deployment ● When you just want to change a parameter: reconfigure (without redeploying everything) ● Automate the process with a “push button” script 64. Results ● Advantages – easy to understand and to implement – no extra moving part (just this extra “push button” script/process) ● Drawbacks – services must allow reconfiguration – reconfiguration has to be triggered after each change – risk of meta-failure (bug in the deployment system) 65. Moving wildly* ● Code deployment: – happens continuously (10, 100, 1000+ times a day) – downtime is not OK, even if it's just a few sporadic failed requests ● Failures happen all the time; repair actions must be fully automated ● Reconfigurations are part of the app lifecycle: – automatic scaling, following planned and unplanned patterns – generalized blue/green deployment, canary testing, etc. *a.k.a “move fast and break things” 66. Strategy for apps moving wildly ● Requirement: detect changes as they happen ● Use a combination of: – monitoring – live stream of events that we can subscribe to – services that register themselves – fast polling ● After deployment, scaling, outage, metric threshold…: automatic reconfiguration 67. Results ● Advantages – everything happens automatically – no extra step to run when you deploy – more modular (different processes can take care of different service types) ● Drawbacks – extra moving parts and services to maintain – meta-failures are even more dangerous 68. Recap table How fast should we move? How much work is it for ... How do we handle ... Slowly Mildly Wildly Devs Ops Scaling Failures Hard-coded 12-Factor Config Database Local LB/routers Ambassadors 69. Recap table (subtitles) How fast should we move? How much work is it for ... How do we handle ... Slowly Mildly Wildly Devs Ops Scaling Failures Hard-coded OK NO NO easy easy painfully horribly 12-Factor OK OK WITH RESTARTS NO easy easy meh meh Config Database OK OK OK hard hard cool cool Local LB/routers OK OK OK medium medium /hard cool cool Ambassadors OK OK OK easy medium /hard cool cool 70. Ambassadors in action 71. The plan ● Deploy a simple application (trainingwheels) – on ECS – on Swarm ● Deploy a complex application (dockercoins) – on ECS – on Swarm 72. Our simple application, “trainingwheels” ● Two service: – web server – redis data store ● Tells you which web server served your request ● Counts how many requests were served ● Keeps separate counters for each server 73. DEMO ● cd ~ ● git clone git://github.com/jpetazzo/trainingwheels ● cd trainingwheels ● docker-compose up ● open app ● ^C 74. Deploying on ECS ● On ECS, a container is created as a member of a task ● Tasks are created from task definitions ● Task definitions are conceptually similar to Compose files (but in a different format) ● ECS CLI to the rescue! 75. Deploying on ECS ● ECS CLI will: – create a task definition from our Compose file – register that task definition with ECS – run a task instance from that task definition ● ECS CLI will not: – work if your Compose file has a “build” section (it only accepts “image” sections) ● Let's use the “build-tag-push” script shown earlier! 76. DEMO ● build-tag-push.py ● set COMPOSE_FILE ● fixup-yaml.sh 77. Scaling “trainingwheels” on ECS At this point, if we deploy and scale, we will end up with multiple copies of the app, each with its own Redis. To avoid this, we need to deploy our first ambassador! Here is the plan: ● Create a new Compose file for our Redis service ● Use ECS CLI to run redis, and note its location ● Update the main Compose file so that the “redis” service is now an ambassador pointing to the actual Redis 78. Introducting jpetazzo/hamba ● Easy ambassadoring for the masses! ● In a shell: docker run jpetazzo/hamba [backend1-addr] [backend1-port] [backend2-addr] [backend2-port] … ● In a Compose file: redis: image: jpetazzo/hamba command: [backend-addr] [backend-port] ... 79. DEMO (1/2) ● mkdir ~/myredis ● cp $COMPOSE_FILE ~/myredis ● cd ~/myredis ● edit $COMPOSE_FILE – expose port 6379 – remove www service ● ecs-cli compose up ● ecs-cli compose ps ● note host+port 80. DEMO (2/2) ● cd ~/trainingwheels ● edit $COMPOSE_FILE – replace redis image with jpetazzo/hamba – add “command: 6379 ” ● ecs-cli compose up ● ecs-cli compose scale 4 ● watch ecs-cli compose ps ● open a couple of apps ● open the load balancer 81. CLEANUP ● ecs-cli compose down ● Let redis running (we'll re-use it later) 82. Scaling “trainingwheels” on Swarm ● Slightly different idea! ● We keep a single Compose file for our app ● We replace links with ambassadors: – using a local address (127.X.Y.Z) – sharing the client container's namespace ● Each container that needs to connect to another service, gets its own private load balancer for this exact service ● That's a lot of load balancers, but don't worry, they're cheap 83. Network namespace ambassadors www 172.17.0.4 www 172.17.0.4 “redis” and “www” containers are created by Compose, and placed by Swarm, potentially on different hosts. In “www”, /etc/hosts has the following entry: 127.127.0.2 redis ContainerContainerHostHost AmbassadorAmbassador redis 172.17.2.5 redis 172.17.2.5 84. Network namespace ambassadors www 172.17.0.4 www 172.17.0.4 At this stage, connection attempts from “www” to “redis” fail with “connection refused.” ContainerContainerHostHost AmbassadorAmbassador redis 172.17.2.5 redis 172.17.2.5 85. Network namespace ambassadors www 172.17.0.4 www 172.17.0.4 ambassador 127.127.0.2 ambassador 127.127.0.2 The ambassador is created. It's sharing the network namespace of the “www” container, meaning that they have the same loopback interface (they can talk over localhost). ContainerContainerHostHost AmbassadorAmbassador redis 172.17.2.5 redis 172.17.2.5 86. Network namespace ambassadors www 172.17.0.4 www 172.17.0.4 ambassador 127.127.0.2 ambassador 127.127.0.2 At this stage, connections are still failing (with either “connection refused” or a timeout, depending on the load balancer settings.) The application has to handle this gracefully. (Crashing and being restarted is graceful enough.) ContainerContainerHostHost AmbassadorAmbassador redis 172.17.2.5 redis 172.17.2.5 87. Network namespace ambassadors www 172.17.0.4 www 172.17.0.4 ambassador 127.127.0.2 ambassador 127.127.0.2 The ambassador receives its configuration, containing the public address of the “redis” container. ContainerContainerHostHost AmbassadorAmbassador redis 172.17.2.5 redis 172.17.2.5 88. Network namespace ambassadors www 172.17.0.4 www 172.17.0.4 ambassador 127.127.0.2 ambassador 127.127.0.2 Traffic can now flow normally from “www” to “redis”. ContainerContainerHostHost AmbassadorAmbassador redis 172.17.2.5 redis 172.17.2.5 89. DEMO (1/2) ● eval $(docker-machine env node00 --swarm) ● edit $COMPOSE_FILE – revert “redis” to use “image: redis” – remove “command:” ● link-to-ambassadors.py ● docker-compose up -d ● docker-compose ps ● open app ● (It doesn't work — yet) 90. DEMO (2/2) ● create-ambassadors.py ● configure-ambassadors.py ● open app ● docker-compose scale www=4 ● create-ambassadors.py ● configure-ambassadors.py ● open app 91. Scaling with ambassadors Before scaling our app, we have one single “www” instance, coupled with its ambassador. (In this example, we have placed the first “www” and “redis” together for clarity.) ContainerContainerHostHost AmbassadorAmbassador wwwwww redisredis ambaamba 92. Scaling with ambassadors “docker-compose scale www=4” We now have 4 instances of “www” but 3 of them can't communicate with “redis” yet. ContainerContainerHostHost AmbassadorAmbassador wwwwww wwwwww wwwwww wwwwww redisredis ambaamba 93. Scaling with ambassadors “create-ambassadors.py” Each “www” instance now has its own ambassador, but 3 of them are still unconfigured. ContainerContainerHostHost AmbassadorAmbassador wwwwww wwwwww ambaamba wwwwww ambaamba redisredis ambaamba wwwwww ambaamba 94. Scaling with ambassadors “configure-ambassadors.py” The 3 new ambassadors receive their configuration and can now route traffic to the “redis” service. ContainerContainerHostHost AmbassadorAmbassador wwwwww wwwwww ambaamba wwwwww ambaamba redisredis ambaamba wwwwww ambaamba 95. CLEANUP ● docker-compose kill ● docker-compose rm -f 96. Scaling “dockercoins” on ECS ● Let's apply the same technique as before ● Separate the Redis service ● Replace “redis” with an ambassador in the Compose file ● Let ECS do the rest! 97. DEMO (1/2) ● Get our Redis host+port again: – cd ~/myredis – ecs-cli compose ps ● cd ~/dockercoins ● set COMPOSE_FILE ● edit $COMPOSE_FILE – change “image: redis” to “image: jpetazzo/hamba” – add “command: 6379 – add “mem_limit: 100000000” everywhere – remove volumes ● fixup-yaml.sh 98. DEMO (2/2) ● ecs-cli compose up ● watch ecs-cli compose ps ● open webui ● ecs-cli compose scale 4 ● watch ecs-cli compose ps ● open webui ● repeat! 99. Scaling “dockercoins” on ECS ● We started with our “redis” service... ContainerContainerHostHost AmbassadorAmbassador redisredis 100. Scaling “dockercoins” on ECS ● Created one instance of the stack with an ambassador... ContainerContainerHostHost AmbassadorAmbassador workerworker rngrnghasherhasher webuiwebui redisredis redisredis 101. Scaling “dockercoins” on ECS workerworker rngrnghasherhasher webuiwebui ● Added a second instance of the full stack... ContainerContainerHostHost redisredis AmbassadorAmbassador workerworker rngrnghasherhasher webuiwebui redisredis redisredis 102. Scaling “dockercoins” on ECS workerworker rngrnghasherhasher webuiwebui ● And another one… etc. ContainerContainerHostHost redisredis AmbassadorAmbassador workerworker rngrnghasherhasher webuiwebui redisredis workerworker rngrnghasherhasher webuiwebui redisredis redisredis 103. Scaling “dockercoins” on Swarm ● Let's apply the same technique as before ● Replace links with ambassadors ● Start containers ● Add ambassadors ● Inject ambassador configuration 104. DEMO (1/2) ● edit COMPOSE_FILE – restore “image: redis” – remove “command:” from the redis section ● link-to-ambassadors.py ● docker-compose up -d ● create-ambassadors.py ● configure-ambassadors.py ● docker-compose ps webui ● open webui 105. DEMO (2/2) ● docker-compose scale webui=2 worker=10 rng=20 hasher=5 ● create-ambassadors.py ● configure-ambassadors.py 106. Scaling “dockercoins” on Swarm ● Two (for simplicity) empty Docker hosts ContainerContainerHostHost AmbassadorAmbassador 107. Scaling “dockercoins” on Swarm ● “docker-compose up” — containers are unwired ContainerContainerHostHost AmbassadorAmbassador workerworker webuiwebui redisredis hasherhasher rngrng 108. Scaling “dockercoins” on Swarm ● Create ambassadors for all containers needing them ContainerContainerHostHost AmbassadorAmbassador workerworker webuiwebui redisredis redisredis hasherhasher rngrng redisredis hasherhasher rngrng 109. Scaling “dockercoins” on Swarm ● Configure ambassadors: the app is up and running ContainerContainerHostHost AmbassadorAmbassador workerworker webuiwebui redisredis redisredis hasherhasher rngrng redisredis hasherhasher rngrng 110. Scaling “dockercoins” on Swarm ● “docker-compose scale” ContainerContainerHostHost AmbassadorAmbassador workerworker webuiwebui redisredis redisredis hasherhasher rngrng redisredis workerworker hasherhasher rngrng workerworker hasherhasher rngrng rngrng hasherhasher rngrng rngrng 111. Scaling “dockercoins” on Swarm ● Creation of new ambassadors ContainerContainerHostHost AmbassadorAmbassador workerworker webuiwebui redisredis redisredis hasherhasher rngrng redisredis workerworker redisredis hasherhasher rngrng hasherhasher rngrng workerworker redisredis hasherhasher rngrng hasherhasher rngrng rngrng hasherhasher rngrng rngrng 112. Scaling “dockercoins” on Swarm ● Configuration of new ambassadors ContainerContainerHostHost AmbassadorAmbassador workerworker webuiwebui redisredis redisredis hasherhasher rngrng redisredis workerworker redisredis hasherhasher rngrng hasherhasher rngrng workerworker redisredis hasherhasher rngrng hasherhasher rngrng rngrng hasherhasher rngrng rngrng 113. Remarks ● Yes, that's a lot of ambassadors ● They are very lightweight, though (~1 MB) docker stats $(docker ps | grep hamba | awk '{print $1}') ● Ambassadors do not add an extra hop – they are local to their client (virtually zero latency) – better efficiency than external load balancer – if the ambassador is down, the client is probably down as well 114. Recap 115. The Docker Compose workflow ● Application portability between: – Docker Compose + Docker Toolbox – Docker Compose + Docker Swarm – ECS CLI + ECS ● Interface points: – Compose file – Docker Registry 116. ECS and Swarm highlights ● Both offer easy provisioning tools ● ECS = AWS ecosystem – integrates with offerings like IAM, ELB… – provides health-checks and self-healing ● Swarm = Docker ecosystem – offers parity with local development environments – exposes real-time events stream through Docker API ● Both require additional tooling for builds (Swarm has preliminary build support) ● Both require extra work for plumbing / service discovery 117. Future directions, ideas ... ● We would love your feedback! ● App-specific ambassadors (SQL bouncers, credential injectors...) ● Automatically replace services using official images: – redis, memcached → elasticache – mysql, postgresql → RDS – etc. 118. Other improvements ● Listen to Docker API events stream, detect containers start/stop events – automatically configure load balancers (ehazlett/interlock) – insert containers into a config database (gliderlabs/registrator) ● Overlay networks (offers direct container-to-container communication) – 3rd party: weave, flannel, pipework – Docker network plugins (experimental.docker.com) 119. Thank you! Questions? 120. Remember to complete your evaluations! 121. Thank you! Related sessions ● CMP302 - Amazon EC2 Container Service: Distributed Applications at Scale ● CMP406 - Amazon ECS at Coursera: Powering a general-purpose near-line execution microservice, while defending against untrusted code ● DVO305 - Turbocharge Your Continuous Deployment Pipeline with Containers ● DVO308 - Docker & ECS in Production: How We Migrated Our Infrastructure from Heroku to AWS (Remind) ● DVO313 - Building Next-Generation Applications with Amazon ECS (Meteor) 122. Thank you! Code repositories: https://github.com/aws/amazon-ecs-cli https://github.com/jpetazzo/dockercoins https://github.com/jpetazzo/trainingwheels https://github.com/jpetazzo/orchestration-workshop Videos: https://www.youtube.com/watch?v=g-g94H_AiOE https://www.youtube.com/watch?v=sk3yYh1MgE0 https://www.youtube.com/watch?v=O3Bps01THBQ https://www.youtube.com/watch?v=LFjwusorazs https://www.youtube.com/watch?v=KqEpIDFxjNc Note: videos just include the installation and deployment processes. I'll make videos of the other demos if there's enough demand for it! Follow us on Twitter: @docker @jpetazzo |
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| Posted by : peter88 | Post date : 2020-01-06 15:31 | ||
| Category : Technology | Views : 415 | ||
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