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‎content/post/minikube-hadoop-cluster.md‎

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---
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title: "Deploy a Hadoop Cluster by Minikube"
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date: 2025-05-05T17:48:50+08:00
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draft: false
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summary: A guide to deploy a Hadoop cluster by minikube.
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tags: ["Hadoop", "Kubernetes", "Minikube", "Helm"]
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categories: ["English"]
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---
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This post is a guide to deploy a Hadoop cluster by minikube.
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# macOS
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## Prerequisite
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```shell
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$ brew install qemu socket_vmnet helm kubectl
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```
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## Start Minikube
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```shell
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$ minikube start --driver qemu --network socket_vmnet \
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--cpus "$(($(nproc) / 2))" --memory "$(nproc)g"
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```
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# Ubuntu 24.04
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## Prerequisite
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- [Helm](https://github.com/helm/helm/releases/latest)
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- [kubectl](https://kubernetes.io/releases/download/)
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- [Docker](https://docs.docker.com/engine/install/ubuntu/)
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```shell
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# https://docs.docker.com/engine/install/linux-postinstall/#manage-docker-as-a-non-root-user
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$ sudo groupadd docker
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$ sudo usermod -aG docker $USER
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$ newgrp docker
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```
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## Start Minikube
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```shell
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$ minikube start --driver docker \
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--cpus "$(($(nproc) / 2))" --memory "$(nproc)g"
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```
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# Install Hadoop Cluster by Helm
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```shell
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$ git clone https://github.com/adonis0147/helm-hadoop
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$ cd helm-hadoop
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$ bash docker/build_image.sh
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$ helm install --name-template hadoop .
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```
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# Check the Status of Hadoop Cluster
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```shell
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$ kubectl get pods
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NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
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dn-0 1/1 Running 0 5m14s 10.244.0.21 minikube <none> <none>
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dn-1 1/1 Running 0 5m9s 10.244.0.27 minikube <none> <none>
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dn-2 1/1 Running 0 5m5s 10.244.0.30 minikube <none> <none>
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hs-0 1/1 Running 0 5m13s 10.244.0.22 minikube <none> <none>
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jn-0 1/1 Running 0 5m14s 10.244.0.24 minikube <none> <none>
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jn-1 1/1 Running 0 5m7s 10.244.0.29 minikube <none> <none>
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jn-2 1/1 Running 0 5m1s 10.244.0.31 minikube <none> <none>
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nm-0 1/1 Running 0 5m14s 10.244.0.20 minikube <none> <none>
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nm-1 1/1 Running 0 5m9s 10.244.0.25 minikube <none> <none>
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nm-2 1/1 Running 0 5m6s 10.244.0.28 minikube <none> <none>
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nn-0 1/1 Running 0 5m14s 10.244.0.19 minikube <none> <none>
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nn-1 1/1 Running 1 (4m38s ago) 5m9s 10.244.0.26 minikube <none> <none>
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rm-0 1/1 Running 0 5m14s 10.244.0.23 minikube <none> <none>
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```
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**Hadoop Cluster**
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- `Namenode`: 2
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- `Journalnode`: 3
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- `Datanode`: 3
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- `Resourcemanager`: 1
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- `Nodemanager`: 3
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- `Historyserver`: 1
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# Access the services
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## macOS
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```shell
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# Set route up
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$ sudo route -n delete 10.244.0.0/16
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$ sudo route -n add 10.244.0.0/16 "$(minikube ip)"
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# Don't kill this process
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$ minikube tunnel
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```
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## Ubuntu 24.04
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```shell
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# Set DNS up
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$ interface="$(netstat -nr | grep "$(minikube ip | sed -n 's/\(.*\)\..*/\1.0/p')" |
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awk '{print $NF}')"
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$ sudo resolvectl dns "${interface}" \
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"$(kubectl get -n kube-system service --no-headers | awk '{print $3}')"
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$ sudo resolvectl domain "${interface}" cluster.local
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# Set route up
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$ sudo route del -net 10.244.0.0 netmask 255.255.0.0
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$ sudo route add -net 10.244.0.0 netmask 255.255.0.0 gw "$(minikube ip)"
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# Don't kill this process
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$ minikube tunnel
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```
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# Test
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## Ping
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```shell
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$ ping nn-0.namenode.default.svc.cluster.local
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PING nn-0.namenode.default.svc.cluster.local (10.244.0.19) 56(84) bytes of data.
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64 bytes from nn-0.namenode.default.svc.cluster.local (10.244.0.19): icmp_seq=1 ttl=63 time=0.069 ms
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64 bytes from nn-0.namenode.default.svc.cluster.local (10.244.0.19): icmp_seq=2 ttl=63 time=0.079 ms
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```
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## Access HDFS
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```shell
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$ kubectl exec -it nn-0 -- hadoop fs -ls /
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Found 1 items
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drwxrwx--- - root supergroup 0 2025-05-05 11:10 /tmp
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```
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## MapReduce Wordcount
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```shell
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$ kubectl exec -it rm-0 -- bash -c 'for i in {0..999}; do echo ${i} >>numbers; done'
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$ kubectl exec -it rm-0 -- hadoop fs -put numbers /numbers
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$ kubectl exec -it rm-0 -- hadoop jar \
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hadoop-current/share/hadoop/mapreduce/hadoop-mapreduce-examples-3.4.0.jar wordcount \
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/numbers /output
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2025-05-05 11:29:30,858 INFO client.DefaultNoHARMFailoverProxyProvider: Connecting to ResourceManager at rm-0.resourcemanager.default.svc.cluster.local/10.244.0.23:8032
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2025-05-05 11:29:31,682 INFO mapreduce.JobResourceUploader: Disabling Erasure Coding for path: /tmp/hadoop-yarn/staging/root/.staging/job_1746443418771_0001
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2025-05-05 11:29:32,242 INFO input.FileInputFormat: Total input files to process : 1
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2025-05-05 11:29:32,492 INFO mapreduce.JobSubmitter: number of splits:1
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2025-05-05 11:29:32,711 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1746443418771_0001
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2025-05-05 11:29:32,712 INFO mapreduce.JobSubmitter: Executing with tokens: []
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2025-05-05 11:29:33,054 INFO conf.Configuration: resource-types.xml not found
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2025-05-05 11:29:33,055 INFO resource.ResourceUtils: Unable to find 'resource-types.xml'.
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2025-05-05 11:29:33,723 INFO impl.YarnClientImpl: Submitted application application_1746443418771_0001
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2025-05-05 11:29:33,854 INFO mapreduce.Job: The url to track the job: http://rm-0.resourcemanager.default.svc.cluster.local:8088/proxy/application_1746443418771_0001/
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2025-05-05 11:29:33,856 INFO mapreduce.Job: Running job: job_1746443418771_0001
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2025-05-05 11:29:45,261 INFO mapreduce.Job: Job job_1746443418771_0001 running in uber mode : false
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2025-05-05 11:29:45,263 INFO mapreduce.Job: map 0% reduce 0%
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2025-05-05 11:29:51,384 INFO mapreduce.Job: map 100% reduce 0%
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2025-05-05 11:30:00,470 INFO mapreduce.Job: map 100% reduce 100%
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2025-05-05 11:30:00,494 INFO mapreduce.Job: Job job_1746443418771_0001 completed successfully
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2025-05-05 11:30:00,638 INFO mapreduce.Job: Counters: 54
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...
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$ kubectl exec -it rm-0 -- hadoop fs -ls /output
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Found 2 items
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-rw-r--r-- 3 root supergroup 0 2025-05-05 11:29 /output/_SUCCESS
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-rw-r--r-- 3 root supergroup 5890 2025-05-05 11:29 /output/part-r-00000
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```
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# Reference
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- [Accessing services in minikube via DNS](https://www.andreasgerstmayr.at/2022/11/23/accessing-services-in-minikube-via-dns.html)
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‎content/post/portable-gcc-toolchain.md‎

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title: "Build a Portable GCC Toolchain"
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date: 2024-05-09T16:49:12+08:00
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draft: false
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summary: A guide to build a portable GCC toolchain
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summary: A guide to build a portable GCC toolchain.
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tags: ["GCC", "x86-64", "aarch64"]
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categories: ["English"]
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---

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