Hi, I have now successfully created a docker for RHEL75 as follows:
[root@rhes75 ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 816f07de15b1 zookeeper "/docker-entrypoint.…" 2 hours ago Up 2 hours 2181/tcp, 2888/tcp, 3888/tcp dockerZooKeeper 8dd84a174834 ubuntu "bash" 6 hours ago Up 6 hours dockerZooKeeperKafka The first container is ready made for ZooKeeper that exposes the zookeeper client port etc. The second container is an ubuntu shell which I installed both zookeeper and Kafka on it. They are both running in container dockerZooKeeperKafka hduser@8dd84a174834: /home/hduser/dba/bin> jps 5715 Kafka 5647 QuorumPeerMain hduser@8dd84a174834: /home/hduser/dba/bin> netstat -plten (Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.) Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State User Inode PID/Program name tcp 0 0 0.0.0.0:9999 0.0.0.0:* LISTEN 1005 2865148 5715/java tcp 0 0 0.0.0.0:35312 0.0.0.0:* LISTEN 1005 2865147 5715/java tcp 0 0 0.0.0.0:34193 0.0.0.0:* LISTEN 1005 2865151 5715/java tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 0 2757032 - tcp 0 0 0.0.0.0:40803 0.0.0.0:* LISTEN 1005 2852821 5647/java *tcp 0 0 0.0.0.0:9092 <http://0.0.0.0:9092> 0.0.0.0:* LISTEN 1005 2873507 5715/javatcp 0 0 0.0.0.0:2181 <http://0.0.0.0:2181> 0.0.0.0:* LISTEN 1005 2852829 5647/java*tcp6 0 0 :::22 :::* LISTEN 0 2757034 - I have a gateway node that is connected to the host running the container. >From within the container I can ssh to the gateway host *as both the gateway host and host running the container are on the same VLAN.* However, I cannot connect from gateway to the container. The container has this IP address root@8dd84a174834:~# ifconfig -a eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 *inet 172.17.0.2 netmask 255.255.0.0 broadcast 172.17.255.255* ether 02:42:ac:11:00:02 txqueuelen 0 (Ethernet) RX packets 173015 bytes 3263068025 (3.2 GB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 189400 bytes 13557709 (13.5 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 loop txqueuelen 1000 (Local Loopback) RX packets 8450 bytes 534805 (534.8 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 8450 bytes 534805 (534.8 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 The interesting thing is that in order to publish streaming test data I need to be able to do something like below cat ${PRICES} | ${KAFKA_HOME}/bin/kafka-console-producer.sh --broker-list rhes75:9092,rhes564:9092,rhes75:9093,rhes564:9093,rhes75:9094,rhes564:9094 --topic md That Kafka broker list --broker-list rhes75:9092,rhes564:9092,rhes75:9093,rhes564:9093,rhes75:9094,rhes564:9094 needs to be replaced by <container hostname>:9092! So at this juncture I am wondering what type of network needs to be created as the container is running within another host. Thanks Dr Mich Talebzadeh LinkedIn * https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw <https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw>* http://talebzadehmich.wordpress.com *Disclaimer:* Use it at your own risk. Any and all responsibility for any loss, damage or destruction of data or any other property which may arise from relying on this email's technical content is explicitly disclaimed. The author will in no case be liable for any monetary damages arising from such loss, damage or destruction. On Sun, 8 Jul 2018 at 20:00, Martin Gainty <mgai...@hotmail.com> wrote: > > > ________________________________ > From: Mich Talebzadeh <mich.talebza...@gmail.com> > Sent: Sunday, July 8, 2018 1:01 PM > To: users@kafka.apache.org > Subject: Re: Real time streaming as a microservice > > Thanks Martin. > > From an implementation point of view do we need to introduce docker for > each microservice? In other words does it have to be artefact --> contain > --> docker for this to be true microservice and all these microservices > communicate through Service Registry. > MG>for deployment deploying thru docker container would be the easiest > means to test > MG>but first we would need to concentrate > MG>on your developing a micro-service first > MG>your development of a service registry > MG>your development of a micro-services container which can lookup > necessary endpoints > MG>since you pre-pordained Docker to be your deploy container I would > suggest implementing OpenShift > https://www.openshift.org/ > OpenShift Origin - Open Source Container Application Platform< > https://www.openshift.org/> > www.openshift.org > The next generation open source app hosting platform by Red Hat > > > > > Also if we wanted to move from a monolithic classic design with Streaming > Ingestion (ZooKeeper, Kafka) --> Processing engine (Spark Streaming, Flink) > --> Real time dashboard (anything built on something like D3) to > microservices how would that entail. > MG>the simpler the function the better ...something like > MG>simple input...user enters 'foo' > MG>simple processing....process does spark stream to determine what result > responds to 'foo' > MG>simple output...output will be text 'bar' formatting to be decided > (text/html/pdf?) > > One option would be to have three > principal microservices (each with sub-services) providing three > components? > MG>concentrate on the simplest function which would be_______________? > MG>shoehorn simple function into a viable microservice > MG>the following inventory microservice from redhat example shows how your > ______? service > MG>can be incorporated into a openshift container > MG>and be readily deployable in docker container > MG> > https://developers.redhat.com/blog/2017/05/16/openshift-and-devops-the-coolstore-microservices-example/ > [ > https://developers.redhat.com/blog/wp-content/uploads/2017/05/img_5912da9d19c3c.png > ]< > https://developers.redhat.com/blog/2017/05/16/openshift-and-devops-the-coolstore-microservices-example/ > > > > OpenShift and DevOps: The CoolStore Microservices Example< > https://developers.redhat.com/blog/2017/05/16/openshift-and-devops-the-coolstore-microservices-example/ > > > developers.redhat.com > Today I want to talk about the demo we presented @ OpenShift Container > Platform Roadshow in Milan & Rome last week. The demo was based on JBoss > team’s great work available on this repo: In the next few paragraphs, I’ll > describe in deep detail the microservices CoolStore example and how we used > ... > > > MG>the first step would involve knowing which simple function you need to > deploy as microservice ? > > Regards, > > Dr Mich Talebzadeh > > > > LinkedIn * > https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw > < > https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw > >* > > > > http://talebzadehmich.wordpress.com > > > *Disclaimer:* Use it at your own risk. Any and all responsibility for any > loss, damage or destruction of data or any other property which may arise > from relying on this email's technical content is explicitly disclaimed. > The author will in no case be liable for any monetary damages arising from > such loss, damage or destruction. > > > > > On Sun, 8 Jul 2018 at 13:58, Martin Gainty <mgai...@hotmail.com> wrote: > > > > > > > initial work under using Zookeeper as a Microservices container is here > > > > > http://planet.jboss.org/post/zookeeper_for_microservice_registration_and_discovery > > > > ZooKeeper for Microservice Registration and Discovery ...< > > > http://planet.jboss.org/post/zookeeper_for_microservice_registration_and_discovery > > > > > planet.jboss.org > > In a microservice world, multiple services are typically distributed in a > > PaaS environment. Immutable infrastructure, such as those provided by > > containers or immutable VM images. Services may scale up and down based > > upon certain pre-defined metrics. Exact address of the service may not be > > known ... > > > > once your Zookeeper Microservices container is operational > > > > you would need to 'tweak' kafka to extend and implement > classes/interfaces > > to become > > a true microservices component..this may help > > > > > > > http://blog.arungupta.me/monolithic-microservices-refactoring-javaee-applications/ > > [ > http://blog.arungupta.me/wp-content/uploads/2015/06/javaee-monolithic.png > > ]< > > > http://blog.arungupta.me/monolithic-microservices-refactoring-javaee-applications/ > > > > > > > Monolithic to Microservices Refactoring for Java EE ...< > > > http://blog.arungupta.me/monolithic-microservices-refactoring-javaee-applications/ > > > > > blog.arungupta.me > > Have you ever wondered what does it take to refactor an existing Java EE > > monolithic application to a microservices-based one? This blog explains > how > > a trivial shopping cart example was converted to microservices-based > > application, and what are some of the concerns around it. > > > > > > > > let me know if i can help out > > Martin > > > > > > ________________________________ > > From: Jörn Franke <jornfra...@gmail.com> > > Sent: Sunday, July 8, 2018 6:18 AM > > To: users@kafka.apache.org > > Cc: u...@flink.apache.org > > Subject: Re: Real time streaming as a microservice > > > > Yes or Kafka will need it ... > > As soon as your orchestrate different microservices this will happen. > > > > > > > > > On 8. Jul 2018, at 11:33, Mich Talebzadeh <mich.talebza...@gmail.com> > > wrote: > > > > > > Thanks Jorn. > > > > > > So I gather as you correctly suggested, microservices do provide value > in > > > terms of modularisation. However, there will always "inevitably" be > > > scenarios where the receiving artefact say Flink needs communication > > > protocol changes? > > > > > > thanks > > > > > > Dr Mich Talebzadeh > > > > > > > > > > > > LinkedIn * > > > https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw > > > < > > > https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw > > >* > > > > > > > > > > > > http://talebzadehmich.wordpress.com > > > > > > > > > *Disclaimer:* Use it at your own risk. Any and all responsibility for > any > > > loss, damage or destruction of data or any other property which may > arise > > > from relying on this email's technical content is explicitly > disclaimed. > > > The author will in no case be liable for any monetary damages arising > > from > > > such loss, damage or destruction. > > > > > > > > > > > > > > >> On Sun, 8 Jul 2018 at 10:25, Jörn Franke <jornfra...@gmail.com> > wrote: > > >> > > >> That they are loosely coupled does not mean they are independent. For > > >> instance, you would not be able to replace Kafka with zeromq in your > > >> scenario. Unfortunately also Kafka sometimes needs to introduce > breaking > > >> changes and the dependent application needs to upgrade. > > >> You will not be able to avoid these scenarios in the future (this is > > only > > >> possible if micro services don’t communicate with each other or if > they > > >> would never need to change their communication protocol - pretty > > impossible > > >> ). However there are ways of course to reduce it, eg kafka could > reduce > > the > > >> number of breaking changes or you can develop a very lightweight > > >> microservice that is very easy to change and that only deals with the > > >> broker integration and your application etc. > > >> > > >>> On 8. Jul 2018, at 10:59, Mich Talebzadeh <mich.talebza...@gmail.com > > > > >> wrote: > > >>> > > >>> Hi, > > >>> > > >>> I have created the Kafka messaging architecture as a microservice > that > > >>> feeds both Spark streaming and Flink. Spark streaming uses > > micro-batches > > >>> meaning "collect and process data" and flink as an event driven > > >>> architecture (a stateful application that reacts to incoming events > by > > >>> triggering computations etc. > > >>> > > >>> According to Wikipedia, A Microservice is a technique that > structures > > an > > >>> application as a collection of loosely coupled services. In a > > >> microservices > > >>> architecture, services are fine-grained and the protocols are > > >> lightweight. > > >>> > > >>> Ok for streaming data among other things I have to create and > configure > > >>> topic (or topics), design a robust zookeeper ensemble and create > Kafka > > >>> brokers with scalability and resiliency. Then I can offer the > streaming > > >> as > > >>> a microservice to subscribers among them Spark and Flink. I can > upgrade > > >>> this microservice component in isolation without impacting either > Spark > > >> or > > >>> Flink. > > >>> > > >>> The problem I face here is the dependency on Flink etc on the jar > files > > >>> specific for the version of Kafka deployed. For example > > kafka_2.12-1.1.0 > > >> is > > >>> built on Scala 2.12 and Kafka version 1.1.0. To make this work in > Flink > > >> 1.5 > > >>> application, I need to use the correct dependency in sbt build. For > > >>> example: > > >>> libraryDependencies += "org.apache.flink" %% > > >> "flink-connector-kafka-0.11" % > > >>> "1.5.0" > > >>> libraryDependencies += "org.apache.flink" %% > > >> "flink-connector-kafka-base" % > > >>> "1.5.0" > > >>> libraryDependencies += "org.apache.flink" %% "flink-scala" % "1.5.0" > > >>> libraryDependencies += "org.apache.kafka" % "kafka-clients" % > > "0.11.0.0" > > >>> libraryDependencies += "org.apache.flink" %% "flink-streaming-scala" > % > > >>> "1.5.0" > > >>> libraryDependencies += "org.apache.kafka" %% "kafka" % "0.11.0.0" > > >>> > > >>> and the Scala code needs to change: > > >>> > > >>> import > > org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer011 > > >>> … > > >>> val stream = env > > >>> .addSource(new FlinkKafkaConsumer011[String]("md", new > > >>> SimpleStringSchema(), properties)) > > >>> > > >>> So in summary some changes need to be made to Flink to be able to > > >> interact > > >>> with the new version of Kafka. And more importantly if one can use an > > >>> abstract notion of microservice here? > > >>> > > >>> Dr Mich Talebzadeh > > >>> > > >>> > > >>> > > >>> LinkedIn * > > >> > > > https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw > > >>> < > > >> > > > https://www.linkedin.com/profile/view?id=AAEAAAAWh2gBxianrbJd6zP6AcPCCdOABUrV8Pw > > >>> * > > >>> > > >>> > > >>> > > >>> http://talebzadehmich.wordpress.com > > >>> > > >>> > > >>> *Disclaimer:* Use it at your own risk. Any and all responsibility for > > any > > >>> loss, damage or destruction of data or any other property which may > > arise > > >>> from relying on this email's technical content is explicitly > > disclaimed. > > >>> The author will in no case be liable for any monetary damages arising > > >> from > > >>> such loss, damage or destruction. > > >> > > >
