Nexus是一個強大的Maven倉庫管理器，通過 nexus 可以搭建 Maven倉庫。它極大地簡化了自己內部倉庫的維護和外部倉庫的訪問，利用Nexus你可以只在一個地方就能夠完全控制訪問和部署在你所維護倉庫中的每個Artifact。Nexus是一套“開箱即用”的系統不需要數據庫，並且還提供強大的倉庫管理、構建、搜索等功能。它使用文件系統加Lucene來組織數據。Nexus使用ExtJS來開發界面，利用Restlet來提供完整的REST APIs，通過m2eclipse與Eclipse集成使用。Nexus支持WebDAV與LDAP安全身份認證。
1、環境介紹
1.1、kubernetes集群環境
# kubectl version
Client Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.0", GitCommit:"e8462b5b5dc2584fdcd18e6bcfe9f1e4d970a529", GitTreeState:"clean", BuildDate:"2019-06-19T16:40:16Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.0", GitCommit:"e8462b5b5dc2584fdcd18e6bcfe9f1e4d970a529", GitTreeState:"clean", BuildDate:"2019-06-19T16:32:14Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"linux/amd64"}
# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master-01 Ready,SchedulingDisabled master 198d v1.15.0
k8s-master-02 Ready,SchedulingDisabled master 198d v1.15.0
k8s-node-01 Ready node 198d v1.15.0
k8s-node-02 Ready node 155d v1.15.0
k8s-node-03 Ready node 133d v1.15.0
k8s-node-04 Ready node 198d v1.15.0
1.2、存儲環境
本集群中kubernetes底層存儲使用的是nfs，並且以nfs作為存儲創建了storageclass便於動態創建pv
# kubectl get sc
NAME PROVISIONER AGE
managed-nfs-storage (default) fuseim.pri/ifs 198d
1.3、nexus版本
nexus版本：3.20.1
2、部署nexus
部署nexus使用官方的docker鏡像，並且這里先對官方的dockerfile進行了分析，官方的dockerfile在github上，
dockerfile中指定運行容器進程的用戶是nexus，聲明了nexus的數據目錄是/nexus-data，聲明了jvm的參數是INSTALL4J_ADD_VM_PARAMS，容器暴露8081端口。內容如下：
FROM registry.access.redhat.com/ubi8/ubi
LABEL vendor=Sonatype \
maintainer="Sonatype <cloud-ops@sonatype.com>" \
com.sonatype.license="Apache License, Version 2.0" \
com.sonatype.name="Nexus Repository Manager base image"
ARG NEXUS_VERSION=3.20.1-01
ARG NEXUS_DOWNLOAD_URL=https://download.sonatype.com/nexus/3/nexus-${NEXUS_VERSION}-unix.tar.gz
ARG NEXUS_DOWNLOAD_SHA256_HASH=fba9953e70e2d53262d2bd953e5fbab3e44cf2965467df14a665b0752de30e51
# configure nexus runtime
ENV SONATYPE_DIR=/opt/sonatype
ENV NEXUS_HOME=${SONATYPE_DIR}/nexus \
NEXUS_DATA=/nexus-data \
NEXUS_CONTEXT='' \
SONATYPE_WORK=${SONATYPE_DIR}/sonatype-work \
DOCKER_TYPE='rh-docker'
ARG NEXUS_REPOSITORY_MANAGER_COOKBOOK_VERSION="release-0.5.20190212-155606.d1afdfe"
ARG NEXUS_REPOSITORY_MANAGER_COOKBOOK_URL="https://github.com/sonatype/chef-nexus-repository-manager/releases/download/${NEXUS_REPOSITORY_MANAGER_COOKBOOK_VERSION}/chef-nexus-repository-manager.tar.gz"
ADD solo.json.erb /var/chef/solo.json.erb
# Install using chef-solo
# Chef version locked to avoid needing to accept the EULA on behalf of whomever builds the image
RUN yum install -y --disableplugin=subscription-manager hostname procps \
&& curl -L https://www.getchef.com/chef/install.sh | bash -s -- -v 14.12.9 \
&& /opt/chef/embedded/bin/erb /var/chef/solo.json.erb > /var/chef/solo.json \
&& chef-solo \
--recipe-url ${NEXUS_REPOSITORY_MANAGER_COOKBOOK_URL} \
--json-attributes /var/chef/solo.json \
&& rpm -qa *chef* | xargs rpm -e \
&& rm -rf /etc/chef \
&& rm -rf /opt/chefdk \
&& rm -rf /var/cache/yum \
&& rm -rf /var/chef \
&& yum clean all
VOLUME ${NEXUS_DATA}
EXPOSE 8081
USER nexus
ENV INSTALL4J_ADD_VM_PARAMS="-Xms1200m -Xmx1200m -XX:MaxDirectMemorySize=2g -Djava.util.prefs.userRoot=${NEXUS_DATA}/javaprefs"
CMD ["sh", "-c", "${SONATYPE_DIR}/start-nexus-repository-manager.sh"]
根據上面的dockerfile文件，編寫部署在k8s集群中的資源清單，通過nfs的storageclass來動態提供pv，將nexus的數據做持久化存儲，並且以NodePort方式暴露服務。
# cat nexus3/nexus3.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
k8s-app: nexus3
name: nexus3
namespace: kube-system
spec:
replicas: 1
selector:
matchLabels:
k8s-app: nexus3
template:
metadata:
labels:
k8s-app: nexus3
name: nexus3
namespace: kube-system
spec:
containers:
- name: nexus3
image: sonatype/nexus3:3.20.1
imagePullPolicy: IfNotPresent
ports:
- containerPort: 8081
name: web
protocol: TCP
livenessProbe:
httpGet:
path: /
port: 8081
initialDelaySeconds: 540
periodSeconds: 30
failureThreshold: 6
readinessProbe:
httpGet:
path: /
port: 8081
initialDelaySeconds: 540
periodSeconds: 30
failureThreshold: 6
resources:
limits:
cpu: 1000m
memory: 2Gi
requests:
cpu: 500m
memory: 512Mi
volumeMounts:
- name: nexus-data
mountPath: /nexus-data
volumes:
- name: nexus-data
persistentVolumeClaim:
claimName: nexus-data-pvc
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: nexus-data-pvc
namespace: kube-system
spec:
accessModes:
- ReadWriteMany
storageClassName: "managed-nfs-storage"
resources:
requests:
storage: 10Gi
---
apiVersion: v1
kind: Service
metadata:
name: nexus3
namespace: kube-system
labels:
k8s-app: nexus3
spec:
selector:
k8s-app: nexus3
type: NodePort
ports:
- name: web
protocol: TCP
port: 8081
targetPort: 8081
nodePort: 30005
執行kubectl apply創建資源，並檢查對應的pv，pvc以及日志
# kubectl apply -f nexus3.yaml
deployment.apps/nexus3 created
persistentvolumeclaim/nexus-data-pvc created
service/nexus3 created
# kubectl -n kube-system get pv,pvc|grep nexus
persistentvolume/pvc-70f810b4-824a-4c4c-8582-6253afe1a350 10Gi RWX Delete Bound kube-system/nexus-data-pvc managed-nfs-storage 1m
persistentvolumeclaim/nexus-data-pvc Bound pvc-70f810b4-824a-4c4c-8582-6253afe1a350 10Gi RWX managed-nfs-storage 1m
# kubectl -n kube-system get pods|grep nexus
nexus3-59c8f8759-sktfv 0/1 Running 0 2m
第一次部署nexus時需要初始化數據等，消耗的時間比較長，直到在日志中能看到如下字樣表示nexus容器啟動完成了，因此上面的部署yaml文件中的健康檢查時間設置為經過測試的540s
2020-02-06 10:41:52,109+0000 INFO [jetty-main-1] *SYSTEM org.eclipse.jetty.server.Server - Started @437947ms
2020-02-06 10:41:52,110+0000 INFO [jetty-main-1] *SYSTEM org.sonatype.nexus.bootstrap.jetty.JettyServer -
-------------------------------------------------
Started Sonatype Nexus OSS 3.20.1-01
-------------------------------------------------
3、訪問檢查
當pod通過健康檢查之后，可以通過NodePort方式訪問到nexus
第一次點擊登錄會提示修改密碼，且默認的初始密碼在服務器的/nexus-data/admin.password文件中
# kubectl -n kube-system exec nexus3-59c8f8759-sktfv -it cat /nexus-data/admin.password
fe8da3fb-b35b-4a8b-95f4-e39ccdc7f760
登錄后進入到頁面
至此，在k8s中部署nexus完成，使用文章后續會發布