kubernetes - Bootstrapping docker deamon -

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in official kubernetes multinode docker guide , mentioned need docker instance:

a bootstrap docker instance used start etcd , flanneld, on kubernetes components depend

so bootstrap instance , how make sure keeps running on restarts ?

the documentation gives detailed explanation purpose of bootstrap instance of docker:

this guide uses pattern of running 2 instances of docker daemon: 1) bootstrap docker instance used start etcd , flanneld, on kubernetes components depend 2) main docker instance used kubernetes infrastructure , user’s scheduled containers

this pattern necessary because flannel daemon responsible setting , managing network interconnects of docker containers created kubernetes. achieve this, must run outside of main docker daemon. however, still useful use containers deployment , management, create simpler bootstrap daemon achieve this.

in summary special bootstrap docker daemon runs bits kubernetes depends on, freeing the normal docker daemon managed kubernetes. trick leverages fact both etcd , flanneld can run containers. alternatively 1 have set them locally services.

as ensuring bootstrapping docker daemon survives restart, answer lies within code. here's it's being called when running master.sh script.

so code attempts setup service docker daemon process.


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