Debugging Docker in production

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1、RunningAground:DebuggingDockerinproductionBryanCantrill(@bcantrill),CTO,JoyentTheDockerrevolution•WhileOScontainershavebeenaroundforoveradecade,Dockerhasbroughttheconcepttoamuchbroaderaudience•Dockerhasusedtherapidprovisioningandsharedfilesystemofcontainerstoallowdevelopersto

2、thinkoperationally-Deploymentprocedurescanbeencodedviaanimage-Imagescanbereliablyandreproduciblydeployedascontainers•DockerisdoingtoaptwhataptdidtotarDockeratJoyent•AtJoyent,wehaverunSmartOS-basedcontainersonthemetalandinmulti-tenantproductionsince~2006•Wewantedtocreateabest-

3、of-all-worldsplatform:thedevelopereaseofDockerontheproduction-gradesubstrateofSmartOS-WedevelopedaLinuxsystemcallinterfaceforSmartOS,allowingSmartOStorunLinuxbinariesatbare-metalspeed-InMarch2015,weintroducedTriton,our(opensource!)stackthatdeploysDockercontainersdirectlyonthe

4、metal-TritonvirtualizesthenotionofaDockerhost(i.e.,“dockerps”showsallofone’scontainersdatacenter-wide)Docker+microservices•Dockerisparticularaptatdeployingmicroservices:small,well-definedservicesthatdoonethinganddoitwell•Whilethetermprovokessomedegreeofnerdrage,itismerelyanew

5、embodimentofanoldidea:theUnixPhilosophy•Whatdoesthecontainer+microservicesrevolutionmeanforhowwedebugprogramsandsystems?Debugging:AnevenolderideaDebugging:AnevenolderideaSirMauriceWilkes,1913-2010Debugging:AnevenolderideaAssoonaswestartedprogramming,wefoundtooursurprisethatit

6、wasn’taseasytogetprogramsrightaswehadthought.Debugginghadtobediscovered.IcanremembertheexactinstantwhenIrealizedthatalargepartofmylifefromthenonwasgoingtobespentinfindingmistakesinmyownprograms.—SirMauriceWilkes,1913-2010DebuggingDocker•WhendeployingDocker+microservices,there

7、isanunstatedtruth:youaredevelopingadistributedsystem•Whilemoreresilienttocertainclassesofforcemajeurefailure,distributedsystemsremainvulnerabletosoftwaredefects•Worse,distributedsystemsarehardertodebug—andaremorelikelytoexhibitbehaviornon-reproducibleindevelopment•Dockerforce

8、sustochangethewaywedebugsystems:wemustdebugnotintermsofsickpetsbutra