Pumba change; support network emulation. Updated on 28-July-2016: cli Introduction The best defense against unexpected failures is to build resilient services. Testing for resiliency enables teams to discover these failures before the customer notices. By intentionally causing failures as part of resiliency testing, you can enforce your policy for building resilient systems. Resilience of the system can be defined as its ability to continue functioning even if some components of the system are failing — . The growing popularity of distributed and microservice architecture makes resilience testing critical for applications that now require 24x7x365 operation. Resilience testing is an approach where you intentionally inject different types of failures at the infrastructure level (VM, network, containers, and processes) and let the system try to recover from these unexpected failures that can happen in production. Simulating realistic failures at any time is the best way to enforce highly available and resilient systems. ephemerality What is Pumba? First of all, (or Pumbaa) is a supporting character from Disney’s animated film . In Swahili, means “to be foolish, silly, weakminded, careless, negligent”. And this actually reflects the desired behavior of application, I’ve tried to build :-) Pumba The Lion King pumbaa Pumba is inspired by highly popular resilience testing tool for cloud. Pumba takes a similar approach, but applies it to container level. It connects to the daemon running on some machine (local or remote) and brings some level of chaos to it: “randomly” killing, stopping and removing running containers. Netfix Chaos Monkey AWS Docker If your system is designed to be resilient, it should be able to recover from such failures. “Failed” services should be restarted and lost connections should be recovered. This is not as trivial as it sounds. You need to design your services differently. Be aware that a service can fail (for whatever reason) or service it depends on can disappear at any point of time (but can reappear later). Expect the unexpected! Why to run Pumba? Failures happen and they inevitably happen when least desired. If your application cannot recover from system failures, you are going to face angry customers and maybe even lose them. If you want to be sure that your system is able to recover from unexpected failures, it would be better to take charge of them and inject failures yourself instead of waiting till they happen. This is not a one time effort. At age of Continuous Delivery, you need to be sure that every change to any one of system services, does not compromise system availability. That’s why you should practice . With Docker gaining popularity as people are deploying and running clusters of containers in production. Using a container orchestration network (e.g. Kubernetes, Swarm, CoreOS fleet), it’s possible to restart a “failed” container automatically. How can you be sure that restarted services and other system services can properly recover from failures? If you are not using container orchestration frameworks, life is even harder: you will need to handle container restarts by yourself. continuous resilience testing This is where Pumba shines. You can run it on every Docker host, in your cluster, and Pumba will “randomly” stop running containers — matching specified name/s or name patterns. You can even specify the signal that will be sent to “kill” the container. What Pumba can do? Pumba can create different failures for your running Docker containers. Pumba can kill, stop or remove running containers. It can also pause all processes within running container for a specified period of time. Pumba can also do network emulation, simulating different network failures, like: delay, packet loss/corruption/reorder, bandwidth limits and more. Disclaimer: netem command is under development and only command is supported in Pumba . delay v0.2.0 You can pass a list of containers to Pumba or just write a regular expression to select matching containers. If you will not specify containers, Pumba will try to disturb all running containers. Use option, to randomly select only one target container from the provided list. --random How to run Pumba? There are two ways to run Pumba. First, you can download Pumba application (single binary file) for your OS from the project and run to see a list of supported commands and options. release page pumba --help $ pumba help Pumba version v0.2.0NAME:Pumba - Pumba is a resilience testing tool, that helps applications tolerate random Docker container failures: process, network and performance. USAGE:pumba [global options] command [command options] containers (name, list of names, RE2 regex) VERSION:v0.2.0 COMMANDS:kill     kill specified containersnetem    emulate the properties of wide area networkspause    pause all processesstop     stop containersrm       remove containershelp, h  Shows a list of commands or help for one command GLOBAL OPTIONS:--host value, -H value      daemon socket to connect to (default: "unix:///var/run/docker.sock") [$DOCKER_HOST]--tls                       use TLS; implied by --tlsverify--tlsverify                 use TLS and verify the remote [$DOCKER_TLS_VERIFY]--tlscacert value           trust certs signed only by this CA (default: "/etc/ssl/docker/ca.pem")--tlscert value             client certificate for TLS authentication (default: "/etc/ssl/docker/cert.pem")--tlskey value              client key for TLS authentication (default: "/etc/ssl/docker/key.pem")--debug                     enable debug mode with verbose logging--json                      produce log in JSON format: Logstash and Splunk friendly--slackhook value           web hook url; send Pumba log events to Slack--slackchannel value        Slack channel (default #pumba) (default: "#pumba")--interval value, -i value  recurrent interval for chaos command; use with optional unit suffix: 'ms/s/m/h'--random, -r                randomly select single matching container from list of target containers--dry                       dry runl does not create chaos, only logs planned chaos commands--help, -h                  show help--version, -v               print the version Examples # stop random container once in a 10 minutes$ ./pumba --random --interval 10m kill --signal SIGSTOP # every 15 minutes kill `mysql` container and# every hour remove containers starting with "hp"$ ./pumba --interval 15m kill --signal SIGTERM mysql &$ ./pumba --interval 1h rm re2:^hp & # every 30 seconds kill "worker1" and "worker2" containers# and every 3 minutes stop "queue" container$ ./pumba --interval 30s kill --signal SIGKILL worker1 worker2 &$ ./pumba --interval 3m stop queue & # Once in 5 minutes, Pumba will delay for 2 seconds (2000ms)# egress traffic for some (randomly chosen) container,# named `result...` (matching `^result` regexp) on `eth2`# network interface.# Pumba will restore normal connectivity after 2 minutes.# Print debug trace to STDOUT too.$ ./pumba --debug --interval 5m --random netem --duration 2m --interface eth2 delay --amount 2000 re2:^result Running Pumba in Docker Container The second approach to run it in a Docker container. In order to give Pumba access to the Docker daemon on the host machine, you will need to mount unix socket. var/run/docker.sock # run latest stable Pumba docker image (from master repository)$ docker run -d \-v /var/run/docker.sock:/var/run/docker.sock \gaiaadm/pumba:master pumba \kill --interval 10s --signal SIGTERM ^hp Pumba will not kill its own container. Next I’ve just created the Pumba project and will gladly accept any ideas, Pull Requests, issues and other contributions to the project. Pumba GitHub Repository Originally published at blog.terranillius.com .

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