![]() It is used to regulate heartbeats, and timeouts. The length of a single tick, which is the basic time unit used by ZooKeeper, as measured in milliseconds. $ docker run -e "ZOO_INIT_LIMIT=10" -name some-zookeeper -restart always -d zookeeper ZOO_TICK_TIME They can be overridden using the following environment variables. ![]() ![]() ZooKeeper recommended defaults are used if zoo.cfg file is not provided. One way to change it is mounting your config file as a volume: $ docker run -name some-zookeeper -restart always -d -v $(pwd)/zoo.cfg:/conf/zoo.cfg zookeeper Environment variables Zookeeper configuration is located in /conf. Multiple virtual machines on the same physical host are still vulnerable to the complete failure of that host.Ĭonsider using Docker Swarm when running Zookeeper in replicated mode. It must be a completely separate physical server. Full redundancy requires that each server have its own machine. If something were to happen which caused the machine to die, all of the zookeeper servers would be offline. Please be aware that setting up multiple servers on a single machine will not create any redundancy. Run docker stack deploy -c stack.yml zookeeper (or docker-compose -f stack.yml up) and wait for it to initialize completely. Please note, that Zookeeper 3.4 has slightly different ZOO_SERVERS format. This will start Zookeeper 3.5 in replicated mode. via docker stack deploy or docker-composeĮxample stack.yml for zookeeper: version: '3.1' Connect to Zookeeper from an application in another Docker container $ docker run -name some-app -link some-zookeeper:zookeeper -d application-that-uses-zookeeper Connect to Zookeeper from the Zookeeper command line client $ docker run -it -rm -link some-zookeeper:zookeeper zookeeper zkCli.sh -server zookeeper. Since the Zookeeper "fails fast" it's better to always restart it. This image includes EXPOSE 2181 2888 3888 8080 (the zookeeper client port, follower port, election port, AdminServer port respectively), so standard container linking will make it automatically available to the linked containers. How to use this image Start a Zookeeper server instance $ docker run -name some-zookeeper -restart always -d zookeeper ZooKeeper was a sub-project of Hadoop but is now a top-level project in its own right. Official-images repo's library/zookeeper file ( history)ĭocs repo's zookeeper/ directory ( history)Īpache ZooKeeper is a software project of the Apache Software Foundation, providing an open source distributed configuration service, synchronization service, and naming registry for large distributed systems. Official-images PRs with label library/zookeeper Repo-info repo's repos/zookeeper/ directory ( history) Supported tags and respective Dockerfile links The Docker Community Forums, the Docker Community Slack, or Stack Overflow
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