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  • Jenkins在Pod中实现Docker in Docker并用kubectl进行部署

    Jenkins在Pod中实现Docker in Docker并用kubectl进行部署

    准备工作

    说明

    Jenkins的kubernetes-plugin在执行构建时会在kubernetes集群中自动创建一个Pod,并在Pod内部创建一个名为jnlp的容器,该容器会连接Jenkins并运行Agent程序,形成一个Jenkins的Master和Slave架构,然后Slave会执行构建脚本进行构建,但如果构建内容是要创建Docker Image就要实现Docker In Docker方案(在Docker里运行Docker),如果要在集群集群内部进行部署操作可以使用kubectl执行命令,要解决kubectl的安装和权限分配问题。

    因为默认的jnlp容器可以执行的命令比较少,所以要实现Docker In Docker和执行kubectl命令,就要自定义构建Docker Image,因为一个Pod内部可以运行多个容器,所以可以用自定义的Docker容器实现上述目的。

    实现Docker In Docker

    构建自定义镜像:

    FROM scratch
    ADD centos-7-x86_64-docker.tar.xz /
    
    LABEL 
        org.label-schema.schema-version="1.0" 
        org.label-schema.name="CentOS Base Image" 
        org.label-schema.vendor="CentOS" 
        org.label-schema.license="GPLv2" 
        org.label-schema.build-date="20200504" 
        org.opencontainers.image.title="CentOS Base Image" 
        org.opencontainers.image.vendor="CentOS" 
        org.opencontainers.image.licenses="GPL-2.0-only" 
        org.opencontainers.image.created="2020-05-04 00:00:00+01:00"
    
    USER root
    
    COPY docker-ce.repo /etc/yum.repos.d/docker-ce.repo
    COPY kubernetes.repo /etc/yum.repos.d/kubernetes.repo
    
    RUN yum install -y docker-ce kubectl
    
    RUN systemctl enable docker
    
    CMD ["/bin/bash"]
    

    需要的文件下载

    更多镜像

    # 构建命令
    docker build -t bluersw/centos-7-docker-kubectl:2.0 .
    
    # 试运行命令
    docker run -v /var/run/docker.sock:/var/run/docker.sock -it bluersw/centos-7-docker-kubectl:2.0 /bin/bash
    
    # Pull命令
    docker pull bluersw/centos-7-docker-kubectl:2.0
    

    运行容器时需要将宿主机的/var/run/docker.sock挂载到容器中去,因为容器内运行不了Docker Daemon,但这样有安全隐患因为可以通过docker.sock提权进而获得宿主机root权限,所以只能运行安全可靠的镜像。

    配置Pod Templates

    为了方便配置一个Pod Templates,在配置kubernetes连接内容的下面,这里的模板只是模板(与类一样使用时还要实例化过程),名称和标签列表不要以为是Pod的name和label,这里的名称和标签列表只是Jenkins查找选择模板时使用的,Jenkins自动创建Pod的name是项目名称+随机字母的组合,所以我们填写jenkins-slave-temp,命名空间填写jenkins-ops(创建命令:kubectl create namespace jenkins-ops),Pod内添加一个容器名称是jnlp-docker(默认的jnlp容器会自动创建),Docker镜像填写:repo.bluersw.com:8083/bluersw/centos-7-docker-kubectl:2.0,repo.bluersw.com:8083是家里的Docker私有仓库(搭建Docker私有仓库),下面增加两个Host Path Volume:/var/run/docker.sock、/etc/docker/daemon.json,保存回到系统管理页面。

    Alt text
    Alt text

    测试运行

    修改构建脚本

    podTemplate (inheritFrom: "jenkins-slave-temp"){
        node(POD_LABEL) {
            container('jnlp'){
                stage('Run shell') {
                    sh 'echo hello world'
                }
            }
            container('jnlp-docker'){
                stage("Run docker"){
                    sh 'docker info'
                }
            }
        }
    }
    
    • podTemplate:用Pod模版示例化一个Pod配置并在kubernetes内自动创建
    • inheritFrom:意思是创建的Pod配置继承自jenkins-slave-temp模版
    • POD_LABEL:自动创建Pod的label
    • container:选择哪个容器执行脚本

    执行构建结果:

    Running on jenkins-test-10-dp8sp-8zxtg-m4x35 in /home/jenkins/agent/workspace/Jenkins-Test
    [Pipeline] {
    [Pipeline] container
    [Pipeline] {
    [Pipeline] stage
    [Pipeline] { (Run shell)
    [Pipeline] sh
    + echo hello world
    hello world
    [Pipeline] }
    [Pipeline] // stage
    [Pipeline] }
    [Pipeline] // container
    [Pipeline] container
    [Pipeline] {
    [Pipeline] stage
    [Pipeline] { (Run docker)
    [Pipeline] sh
    + docker info
    Client:
     Debug Mode: false
    
    Server:
     Containers: 32
      Running: 19
      Paused: 0
      Stopped: 13
     Images: 11
     Server Version: 19.03.9
     Storage Driver: overlay2
      Backing Filesystem: xfs
      Supports d_type: true
      Native Overlay Diff: true
     Logging Driver: json-file
     Cgroup Driver: cgroupfs
     Plugins:
      Volume: local
      Network: bridge host ipvlan macvlan null overlay
      Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
     Swarm: inactive
     Runtimes: runc
     Default Runtime: runc
     Init Binary: docker-init
     containerd version: 7ad184331fa3e55e52b890ea95e65ba581ae3429
     runc version: dc9208a3303feef5b3839f4323d9beb36df0a9dd
     init version: fec3683
     Security Options:
      seccomp
       Profile: default
     Kernel Version: 4.4.224-1.el7.elrepo.x86_64
     Operating System: CentOS Linux 7 (Core)
     OSType: linux
     Architecture: x86_64
     CPUs: 4
     Total Memory: 3.858GiB
     Name: centos7-k8s-node1
     ID: 3R5I:DJGZ:YRZY:ESCH:VW7H:VGAD:5SCC:GYZV:QZZS:EX5M:MV3N:246K
     Docker Root Dir: /var/lib/docker
     Debug Mode: false
     Registry: https://index.docker.io/v1/
     Labels:
     Experimental: false
     Insecure Registries:
      repo.bluersw.com:8083
      repo.bluersw.com:8082
      127.0.0.0/8
     Live Restore Enabled: false
    
    [Pipeline] }
    [Pipeline] // stage
    [Pipeline] }
    [Pipeline] // container
    [Pipeline] }
    [Pipeline] // node
    [Pipeline] }
    [Pipeline] // podTemplate
    [Pipeline] End of Pipeline
    Finished: SUCCESS
    

    注意:我K8S集群使用root运行的所以权限很高,你如果使用其他账号运行的K8S集群,会遇到/var/run/docker.sock没有访问权限的问题,因为Docker必须是root权限运行,解决办法是:

    # Docker 服务重启要重新执行
    chmod 777 /var/run/docker.sock
    

    Pod内使用Kubectl命令

    在所有Node节点上执行:

    mkdir -p $HOME/.kube
    cp -i /etc/kubernetes/kubelet.conf  $HOME/.kube/config
    chown $(id -u):$(id -g) $HOME/.kube/config
    
    # 测试一下
    kubectl get pod -A
    

    修改Pod Templates配置

    在Pod Templates配置中增加两个Host Path Volume:/root/.kube、/var/lib/kubelet/pki/

    Alt text

    测试运行kubectl

    修改构建脚本:

    podTemplate (inheritFrom: "jenkins-slave-temp"){
        node(POD_LABEL) {
            container('jnlp'){
                stage('Run shell') {
                    sh 'echo hello world'
                }
            }
            container('jnlp-docker'){
                stage("Run docker"){
                    sh 'kubectl get pods -A'
                }
            }
        }
    }
    

    运行结果:

    Running on jenkins-test-11-7m94s-nxrj4-j2z0g in /home/jenkins/agent/workspace/Jenkins-Test
    [Pipeline] {
    [Pipeline] container
    [Pipeline] {
    [Pipeline] stage
    [Pipeline] { (Run shell)
    [Pipeline] sh
    + echo hello world
    hello world
    [Pipeline] }
    [Pipeline] // stage
    [Pipeline] }
    [Pipeline] // container
    [Pipeline] container
    [Pipeline] {
    [Pipeline] stage
    [Pipeline] { (Run docker)
    [Pipeline] sh
    + kubectl get pods -A
    NAMESPACE              NAME                                         READY   STATUS    RESTARTS   AGE
    jenkins-ops            jenkins-test-11-7m94s-nxrj4-j2z0g            2/2     Running   0          15s
    kube-system            coredns-7ff77c879f-ck49p                     1/1     Running   9          5d2h
    kube-system            coredns-7ff77c879f-d2xfc                     1/1     Running   10         5d2h
    kube-system            dnsutils                                     1/1     Running   16         5d1h
    kube-system            etcd-centos7-k8s-master                      1/1     Running   11         5d2h
    kube-system            kube-apiserver-centos7-k8s-master            1/1     Running   6          4d
    kube-system            kube-controller-manager-centos7-k8s-master   1/1     Running   12         5d2h
    kube-system            kube-flannel-ds-amd64-52vcn                  1/1     Running   9          5d1h
    kube-system            kube-flannel-ds-amd64-vtw58                  1/1     Running   12         5d1h
    kube-system            kube-flannel-ds-amd64-xm8d5                  1/1     Running   10         5d1h
    kube-system            kube-proxy-l8875                             1/1     Running   18         5d1h
    kube-system            kube-proxy-p5fdr                             1/1     Running   9          5d1h
    kube-system            kube-proxy-pdvz2                             1/1     Running   16         5d1h
    kube-system            kube-scheduler-centos7-k8s-master            1/1     Running   10         5d2h
    kube-system            metrics-server-7f6d95d688-vjsbj              1/1     Running   7          4d
    kubernetes-dashboard   dashboard-metrics-scraper-6b4884c9d5-8hblg   1/1     Running   7          4d
    kubernetes-dashboard   kubernetes-dashboard-7b544877d5-tz4xj        1/1     Running   7          4d
    nginx-ingress          coffee-5f56ff9788-2745d                      1/1     Running   6          3d23h
    nginx-ingress          coffee-5f56ff9788-c8jlx                      1/1     Running   6          3d23h
    nginx-ingress          nginx-ingress-hjqzc                          1/1     Running   6          3d23h
    nginx-ingress          nginx-ingress-jfh6h                          1/1     Running   6          3d23h
    nginx-ingress          tea-69c99ff568-cpp2k                         1/1     Running   6          3d23h
    nginx-ingress          tea-69c99ff568-rmnr2                         1/1     Running   6          3d23h
    [Pipeline] }
    [Pipeline] // stage
    [Pipeline] }
    [Pipeline] // container
    [Pipeline] }
    [Pipeline] // node
    [Pipeline] }
    [Pipeline] // podTemplate
    [Pipeline] End of Pipeline
    Finished: SUCCESS
    

    虽然运行成功了,但目前kubectl使用的账号权限只能用于查询,如果项目进行部署是不行的,所以要创建新的账号供Jenkins使用,权限在某个命名空间内可以管理Pod资源即可。

    为Jenkins创建kubernetes集群账号和证书

    在Master上执行:

    # 进入集群CA证书所在目录
    cd /etc/kubernetes/pki
    
    # 执行创建证书命令
    (umask 077;openssl genrsa -out jenkins.key 2048)
    
    # O=组织信息,CN=用户名
    openssl req -new -key jenkins.key -out jenkins.csr -subj "/O=kubernetes/CN=jenkins"
    
    # 签署证书
    openssl  x509 -req -in jenkins.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out jenkins.crt -days 3650
    

    将jenkins.crt和jenkins.key两个文件复制到所有Node节点上的/etc/kubernetes/pki目录内:

    # jenkins.crt
    cat jenkins.crt
    
    -----BEGIN CERTIFICATE-----
    MIICuDCCAaACCQD6pvA8Ecor7zANBgkqhkiG9w0BAQsFADAVMRMwEQYDVQQDEwpr
    dWJlcm5ldGVzMB4XDTIwMDUyOTE2MDE0OFoXDTMwMDUyNzE2MDE0OFowJzETMBEG
    A1UECgwKa3ViZXJuZXRlczEQMA4GA1UEAwwHamVua2luczCCASIwDQYJKoZIhvcN
    AQEBBQADggEPADCCAQoCggEBALQS8ft94y2inZF7rWgc3xfkUP+4RUgab4FGBE7r
    iQ5eSqQ5Hxwgx0mbYqh12xs/IhGp4YY/NUqU5hXchQ7urEKdefmQjD3CcPPWgIsJ
    8MA1uAdc6wG4d9eo0qcUcisPk6giPmXOtqw4EukH0VZLTPrRp/zle5SQHUSpSyuP
    CciuFSoWnm6xMo2fvTeH3WWM7MCFyCn7+OJkIaWlFWmp/qUGtsYI8lq2D4BVk0lf
    jw51KmYznj1izKxyEm8Kn/qpJ+myFHdc0GdxjLUCpFXpeHLxCEFAhJBnpUtuOA4O
    2uBIDxp2j7f4BnLzQvPifnMPb5o6WF7Q/2fYOKcMvC1MWtECAwEAATANBgkqhkiG
    9w0BAQsFAAOCAQEAaLpkGaFhpjLe6zO4vvDJXvGWhaY0XZKv8HrFQq6+Vqv+yf7f
    LCMwDaO2sLPZNVY8ruSYgbbG+Qbj8KNsDwKrMyf++fmxcpyo9XXkfnsh209hbL9C
    oMImnRRiw5bVX5nto2EEgpjPoI1EW79dfMUN8+KLj4IKe910vJ1rK3PsaNmh7T7m
    3bVrfZFwz8yamHn629gxxvxZZfoN4f0kc2PqGSFsLxwYuRGGueZjNK9z5ixis/S3
    yEaGnjXBPZuoTC78X+avJhxBKLczVNLIiet+HWAcUsic9Ot49QfYZj4ovIrR+Uqg
    HJeI+VavIrgYd9T42XeWGBKTnEhfcniKwEZxog==
    -----END CERTIFICATE-----
    
    # jenkins.key
    cat jenkins.key
    
    -----BEGIN RSA PRIVATE KEY-----
    MIIEowIBAAKCAQEAtBLx+33jLaKdkXutaBzfF+RQ/7hFSBpvgUYETuuJDl5KpDkf
    HCDHSZtiqHXbGz8iEanhhj81SpTmFdyFDu6sQp15+ZCMPcJw89aAiwnwwDW4B1zr
    Abh316jSpxRyKw+TqCI+Zc62rDgS6QfRVktM+tGn/OV7lJAdRKlLK48JyK4VKhae
    brEyjZ+9N4fdZYzswIXIKfv44mQhpaUVaan+pQa2xgjyWrYPgFWTSV+PDnUqZjOe
    PWLMrHISbwqf+qkn6bIUd1zQZ3GMtQKkVel4cvEIQUCEkGelS244Dg7a4EgPGnaP
    t/gGcvNC8+J+cw9vmjpYXtD/Z9g4pwy8LUxa0QIDAQABAoIBAHajjL4u4H/uhXWW
    UFcpvmoVSLBSDYNFt3UqVihQ0gmfYfn0kGSNy/7Y2xU2INdArweIL0etWUT7+OMq
    WJfP87on2nbsHxmJg7WC+0mfkPhx6/8d3s9RY9O4LKFbvSRVrOi3NvkISh4JC5xw
    RCFglyUhAFaEMvlcQYw9JYNbSAzoWRLAdDIZJ5bOsedOtcJkpxQczr3ngYvJ2nXC
    0sLCY6/Je9BDl01K4IHXIpKVrEmhJNj+KV9L8Umrkwr87RGr4jb25aHURW2abRY4
    16qU8YUrdTG8eQqT/xMZtea1QcERyRr3y29FK8pO1ID+tyoNc/KEG3oEGbJPKzHj
    WB9CxukCgYEA5RLulHqyEAb2vEwaIRnbA5KPqDS0nfbe5L87FYO3J6KcJBokMlBm
    aNqlCiTThu5H4SOMaYJO4u9yxMPGYDNbPKdwt27trgqYoCso1tWcDv3DQsgi/M0q
    vip/ciH37vK3f+AlaQeSrtJi4TH7xTJYwgsN3X9TuToq958+F5qqTe8CgYEAyT2O
    GBinOOn349IDeHxYbzFgjmLtW2YEGp8FnpU/sziluPNCA9muTUUiBm9VUHN7YSEm
    DDQmohhee4IeseIrMBnHGuKkwpBDl+235tVCtCNXeTIx/hAGALw1BnNMVrHKspt2
    nqMch0+VMPypZ9HyA81I+Xqd5Zr3QA1IR/J8oz8CgYBjzIO0nF/HK8GC94TKtwD7
    5XZAyfWGfG9PKSEMln3M/sMX12u9n9l+BQOyD6k4N8eJBnu928+Sfs95efGLJ9Sv
    8CLjR6i1Eli8LxFzx0xeG6BeD+NuT9Q3VTyA9NuXdpcLVxP1Vh9Jms8JXUVa/Dw/
    DaHUxgwrvnPJvc7HadKYcQKBgCYR3QW19DySFnEk079BVsGCR8/n6xs1S2V12+xK
    M8jF2KQKcNylm5HGmE87VJppnlebm8UHQJ+9mHIpBYGFVcI9virZ4W1lOUROllG2
    2m2VmgC1fDuh8GDHOgjEWxazf7MWMfSEyurWJVUlFy8qymvps/puNdyv2kJlwNzL
    hMSlAoGBAI/OWcteFYjPsYQM6d6FL9HMeuksN75nVqaZYOA59e+BUnt0e9r7D4cG
    4wupqWA66IHo89t/JkkZ7Utxw/MO7kuyXy1tnxO6/Of1p6XWn3ckPQkGMADXfP/u
    1osgYu8jLmVDMJ4nTTAZ3i/O6T3pqnl3TDbIgL9FRLxyggp5ZwRN
    -----END RSA PRIVATE KEY-----
    

    复制文件完成后在所有Node节点上执行:

    # 创建jenkins用户信息
    kubectl config set-credentials jenkins --client-certificate=jenkins.crt --client-key=jenkins.key --embed-certs=true
    
    # 设置上下文信息,jenkins用户与集群建立关系
    kubectl config set-context jenkins@default-cluster --cluster=default-cluster --user=jenkins
    
    # 查看结果
    kubectl config view
    
    apiVersion: v1
    clusters:
    - cluster:
        certificate-authority-data: DATA+OMITTED
        server: https://192.168.122.3:6443
      name: default-cluster
    contexts:
    - context:
        cluster: default-cluster
        namespace: default
        user: default-auth
      name: default-context
    - context:
        cluster: default-cluster
        user: jenkins
      name: jenkins@default-cluster
    current-context: default-context
    kind: Config
    preferences: {}
    users:
    - name: default-auth
      user:
        client-certificate: /var/lib/kubelet/pki/kubelet-client-current.pem
        client-key: /var/lib/kubelet/pki/kubelet-client-current.pem
    - name: jenkins
      user:
        client-certificate-data: REDACTED
        client-key-data: REDACTED
    

    切换刚创建的上下文(切换用户)

    # 切换用户
    kubectl config use-context jenkins@default-cluster
    
    # 测试
    kubectl get pod
    
    # 没有权限
    Error from server (Forbidden): pods is forbidden: User "jenkins" cannot list resource "pods" in API group "" in the namespace "default"
    

    目前新账号没有分配权限无法使用,创建dev-test命名空间,并创建管理该命名空间下pod资源的角色,然后绑定到jenkins账户:

    # 创建yaml内容但不执行,查看资源yaml可以加--dry-run -o yaml参数
    kubectl create namespace dev-test
    

    创建角色:

    kind: Role
    apiVersion: rbac.authorization.k8s.io/v1beta1
    metadata:
      name: jenkins-role
    rules:
    - apiGroups: [""]
      resources: ["pods"]
      verbs: ["create","delete","get","list","patch","update","watch"]
    - apiGroups: [""]
      resources: ["pods/exec"]
      verbs: ["create","delete","get","list","patch","update","watch"]
    - apiGroups: [""]
      resources: ["pods/log"]
      verbs: ["get","list","watch"]
    - apiGroups: [""]
      resources: ["events"]
      verbs: ["watch"]
    - apiGroups: [""]
      resources: ["secrets"]
      verbs: ["get"]
    
    # 创建
    kubectl apply -f jenkins-role.yaml -n dev-test
    

    绑定账号与角色:

    apiVersion: rbac.authorization.k8s.io/v1
    kind: RoleBinding
    metadata:
      name: jenkins-role-bind
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: Role
      name: jenkins-role
    subjects:
    - apiGroup: rbac.authorization.k8s.io
      kind: User
      name: jenkins
    
    # 创建
    kubectl apply -f jenkins-role-bind.yaml -n dev-test
    

    注意:Role和RoleBinding的命名空间都是dev-test权限才生效,否则是不会生效的,账号jenkins此时拥有对dev-test命名空间pod的管理权限。

    测试权限:

    # 在Node节点执行
    [root@centos7-k8s-node1 ~]# kubectl apply -f ndsutils.yaml -n dev-test
    pod/dnsutils created
    [root@centos7-k8s-node1 ~]# kubectl get pod -n dev-test
    NAME       READY   STATUS    RESTARTS   AGE
    dnsutils   1/1     Running   0          11s
    [root@centos7-k8s-node1 ~]# kubectl get pod -n default
    Error from server (Forbidden): pods is forbidden: User "jenkins" cannot list resource "pods" in API group "" in the namespace "default"
    

    测试kubectl删除和创建Pod

    在PodTemplate中增加Host Path Volume:/root/yaml,里面放入一个pod资源的yaml文件

    修改构建脚本:

    podTemplate (inheritFrom: "jenkins-slave-temp"){
        node(POD_LABEL) {
            container('jnlp'){
                stage('Run shell') {
                    sh 'echo hello world'
                }
            }
            container('jnlp-docker'){
                stage("Run docker"){
                    sh 'kubectl config use-context jenkins@default-cluster'
                    sh 'kubectl delete -f /root/yaml/ndsutils.yaml -n dev-test'
                    sh 'kubectl get pod -n dev-test'
                    sh 'kubectl apply -f /root/yaml/ndsutils.yaml -n dev-test'
                    sh 'kubectl get pod -n dev-test'
                }
            }
        }
    }
    

    构建运行结果:

    Running on jenkins-test-13-lpcwk-fjw2j-4rzxf in /home/jenkins/agent/workspace/Jenkins-Test
    [Pipeline] {
    [Pipeline] container
    [Pipeline] {
    [Pipeline] stage
    [Pipeline] { (Run shell)
    [Pipeline] sh
    + echo hello world
    hello world
    [Pipeline] }
    [Pipeline] // stage
    [Pipeline] }
    [Pipeline] // container
    [Pipeline] container
    [Pipeline] {
    [Pipeline] stage
    [Pipeline] { (Run docker)
    [Pipeline] sh
    + kubectl config use-context jenkins@default-cluster
    Switched to context "jenkins@default-cluster".
    [Pipeline] sh
    + kubectl delete -f /root/yaml/ndsutils.yaml -n dev-test
    pod "dnsutils" deleted
    [Pipeline] sh
    + kubectl get pod -n dev-test
    No resources found in dev-test namespace.
    [Pipeline] sh
    + kubectl apply -f /root/yaml/ndsutils.yaml -n dev-test
    pod/dnsutils created
    [Pipeline] sh
    + kubectl get pod -n dev-test
    NAME       READY   STATUS              RESTARTS   AGE
    dnsutils   0/1     ContainerCreating   0          1s
    [Pipeline] }
    [Pipeline] // stage
    [Pipeline] }
    [Pipeline] // container
    [Pipeline] }
    [Pipeline] // node
    [Pipeline] }
    [Pipeline] // podTemplate
    [Pipeline] End of Pipeline
    Finished: SUCCESS
    

    为jenkins账号赋予集群角色

    创建集群角色,此集群角色只有查看Pod的权限:

    apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRole
    metadata:
      name: cluster-reader
    rules:
    - apiGroups: [""]
      resources: ["pods"]
      verbs: ["get","list","watch"]
    

    绑定账号和集群角色:

    apiVersion: rbac.authorization.k8s.io/v1beta1
    kind: ClusterRoleBinding
    metadata:
      name: cluster-reader-jenkins
    roleRef:
      apiGroup: rbac.authorization.k8s.io
      kind: ClusterRole
      name: cluster-reader
    subjects:
    - apiGroup: rbac.authorization.k8s.io
      kind: User
      name: jenkins
    

    集群角色没有命名空间的概念,集群角色是在所有命名空间有效。

    # 创建
    kubectl apply -f cluster-reader.yaml
    
    # 绑定
    kubectl apply -f cluster-reader-jenkins.yaml
    

    在Node节点上执行:

    [root@centos7-k8s-node1 yaml]# kubectl get pod -A
    NAMESPACE              NAME                                         READY   STATUS    RESTARTS   AGE
    dev-test               dnsutils                                     1/1     Running   0          7m17s
    kube-system            coredns-7ff77c879f-ck49p                     1/1     Running   9          5d3h
    kube-system            coredns-7ff77c879f-d2xfc                     1/1     Running   10         5d3h
    kube-system            etcd-centos7-k8s-master                      1/1     Running   11         5d3h
    kube-system            kube-apiserver-centos7-k8s-master            1/1     Running   6          4d1h
    kube-system            kube-controller-manager-centos7-k8s-master   1/1     Running   12         5d3h
    kube-system            kube-flannel-ds-amd64-52vcn                  1/1     Running   9          5d3h
    kube-system            kube-flannel-ds-amd64-vtw58                  1/1     Running   12         5d3h
    kube-system            kube-flannel-ds-amd64-xm8d5                  1/1     Running   10         5d3h
    kube-system            kube-proxy-l8875                             1/1     Running   18         5d3h
    kube-system            kube-proxy-p5fdr                             1/1     Running   9          5d3h
    kube-system            kube-proxy-pdvz2                             1/1     Running   16         5d3h
    kube-system            kube-scheduler-centos7-k8s-master            1/1     Running   10         5d3h
    kube-system            metrics-server-7f6d95d688-vjsbj              1/1     Running   7          4d1h
    kubernetes-dashboard   dashboard-metrics-scraper-6b4884c9d5-8hblg   1/1     Running   7          4d1h
    kubernetes-dashboard   kubernetes-dashboard-7b544877d5-tz4xj        1/1     Running   7          4d1h
    nginx-ingress          coffee-5f56ff9788-2745d                      1/1     Running   6          4d1h
    nginx-ingress          coffee-5f56ff9788-c8jlx                      1/1     Running   6          4d1h
    nginx-ingress          nginx-ingress-hjqzc                          1/1     Running   6          4d1h
    nginx-ingress          nginx-ingress-jfh6h                          1/1     Running   6          4d1h
    nginx-ingress          tea-69c99ff568-cpp2k                         1/1     Running   6          4d1h
    nginx-ingress          tea-69c99ff568-rmnr2                         1/1     Running   6          4d1h
    
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  • 原文地址:https://www.cnblogs.com/bluersw/p/12990771.html
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