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k8s使用ceph实现动态持久化存储 https://juejin.im/post/5b766b5bf265da27e36efdfa
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2018.08.17 14:37* 字数 435 阅读 3432评论 1喜欢 3
简介
本文章介绍如何使用ceph为k8s提供动态申请pv的功能。ceph提供底层存储功能,cephfs方式支持k8s的pv的3种访问模式ReadWriteOnce,ReadOnlyMany ,ReadWriteMany ,RBD支持ReadWriteOnce,ReadOnlyMany两种模式
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访问模式只是能力描述,并不是强制执行的,对于没有按pvc声明的方式使用pv,存储提供者应该负责访问时的运行错误。例如如果设置pvc的访问模式为ReadOnlyMany ,pod挂载后依然可写,如果需要真正的不可写,申请pvc是需要指定 readOnly: true 参数
部署
部署k8s
centos7使用kubeadm安装k8s-1.11版本
部署ceph
centos7安装ceph分布式存储集群
在k8s集群中配置使用ceph
使用Ceph RBD
使用kubeadm安装集群的额外配置
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: rbd-provisioner
rules:
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: rbd-provisioner
subjects:
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: rbd-provisioner
namespace: kube-system
rules:
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: rbd-provisioner
namespace: kube-system
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: rbd-provisioner
subjects:
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: rbd-provisioner
namespace: kube-system
spec:
replicas: 1
strategy:
type: Recreate
template:
metadata:
labels:
app: rbd-provisioner
spec:
containers:
kubectl get pod -n kube-system
配置 storageclass
yum install -y ceph-common
ceph osd pool create kube 4096
ceph osd pool ls
ceph auth get-or-create client.kube mon 'allow r' osd 'allow class-read object_prefix rbd_children, allow rwx pool=kube' -o ceph.client.kube.keyring
ceph auth get-key client.admin
ceph auth get-key client.kube
export CEPH_ADMIN_SECRET='AQBBAnRbSiSOFxAAEZXNMzYV6hsceccYLhzdWw=='
kubectl create secret generic ceph-secret --type="kubernetes.io/rbd" \
--from-literal=key=$CEPH_ADMIN_SECRET \
--namespace=kube-system
export CEPH_KUBE_SECRET='AQBZK3VbTN/QOBAAIYi6CRLQcVevW5HM8lunOg=='
kubectl create secret generic ceph-user-secret --type="kubernetes.io/rbd" \
--from-literal=key=$CEPH_KUBE_SECRET \
--namespace=default
kubectl get secret ceph-user-secret -o yaml
kubectl get secret ceph-secret -n kube-system -o yaml
cat >storageclass-ceph-rdb.yaml<
apiVersion: storage.k8s.io/v1
metadata:
name: dynamic-ceph-rdb
provisioner: ceph.com/rbd
parameters:
monitors: 11.11.11.111:6789,11.11.11.112:6789,11.11.11.113:6789
adminId: admin
adminSecretName: ceph-secret
adminSecretNamespace: kube-system
pool: kube
userId: kube
userSecretName: ceph-user-secret
fsType: ext4
imageFormat: "2"
imageFeatures: "layering"
EOF
kubectl apply -f storageclass-ceph-rdb.yaml
kubectl get sc
测试使用
cat >ceph-rdb-pvc-test.yaml<
apiVersion: v1
metadata:
name: ceph-rdb-claim
spec:
accessModes:
kubectl get pvc
kubectl get pv
cat >nginx-pod.yaml<
kind: Pod
metadata:
name: nginx-pod1
labels:
name: nginx-pod1
spec:
containers:
kubectl get pods -o wide
kubectl exec -ti nginx-pod1 -- /bin/sh -c 'echo Hello World from Ceph RBD!!! > /usr/share/nginx/html/index.html'
POD_ID=$(kubectl get pods -o wide | grep nginx-pod1 | awk '{print $(NF-1)}')
curl http://$POD_ID
kubectl delete -f nginx-pod.yaml
kubectl delete -f ceph-rdb-pvc-test.yaml
使用 CephFS
linux内核需要4.10+,否则会出现无法正常使用的问题,详细issue信息 https://github.com/kubernetes-incubator/external-storage/issues/345
centos7升级内核
在ceph集群创建CephFS
ceph osd pool create fs_data 128
ceph osd pool create fs_metadata 128
ceph osd lspools
ceph fs new cephfs fs_metadata fs_data
ceph fs ls
部署cephfs-provisioner
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: cephfs-provisioner
rules:
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: cephfs-provisioner
subjects:
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
name: cephfs-provisioner
namespace: kube-system
rules:
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
name: cephfs-provisioner
namespace: kube-system
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: cephfs-provisioner
subjects:
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: cephfs-provisioner
namespace: kube-system
spec:
replicas: 1
strategy:
type: Recreate
template:
metadata:
labels:
app: cephfs-provisioner
spec:
containers:
kubectl get pod -n kube-system
配置 storageclass
ceph auth get-key client.admin
export CEPH_ADMIN_SECRET='AQBBAnRbSiSOFxAAEZXNMzYV6hsceccYLhzdWw=='
kubectl create secret generic ceph-secret --type="kubernetes.io/rbd" \
--from-literal=key=$CEPH_ADMIN_SECRET \
--namespace=kube-system
kubectl get secret ceph-secret -n kube-system -o yaml
cat >storageclass-cephfs.yaml<
apiVersion: storage.k8s.io/v1
metadata:
name: dynamic-cephfs
provisioner: ceph.com/cephfs
parameters:
monitors: 11.11.11.111:6789,11.11.11.112:6789,11.11.11.113:6789
adminId: admin
adminSecretName: ceph-secret
adminSecretNamespace: "kube-system"
claimRoot: /volumes/kubernetes
EOF
kubectl apply -f storageclass-cephfs.yaml
kubectl get sc
测试使用
cat >cephfs-pvc-test.yaml<
apiVersion: v1
metadata:
name: cephfs-claim
spec:
accessModes:
kubectl get pvc
kubectl get pv
cat >nginx-pod.yaml<
kind: Pod
metadata:
name: nginx-pod1
labels:
name: nginx-pod1
spec:
containers:
kubectl get pods -o wide
kubectl exec -ti nginx-pod1 -- /bin/sh -c 'echo Hello World from CephFS!!! > /usr/share/nginx/html/index.html'
POD_ID=$(kubectl get pods -o wide | grep nginx-pod1 | awk '{print $(NF-1)}')
curl http://$POD_ID
kubectl delete -f nginx-pod.yaml
kubectl delete -f cephfs-pvc-test.yaml
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