kubernetes集群中ceph集群使用

一:CephFS 创建和使用

CephFS 允许用户挂载一个兼容posix的共享目录到多个主机，该存储和NFS共享存储以及CIFS共享目录相似

1.filesystem 配置

[root@master ~]#  cd /tmp/rook/cluster/examples/kubernetes/ceph
[root@master ceph]# sed -i 's/failureDomain: host/failureDomain: osd/g' filesystem.yaml
[root@master ceph]# kubectl apply -f filesystem.yaml
cephfilesystem.ceph.rook.io/myfs created
[root@master cephfs]# kubectl -n rook-ceph get pod -l app=rook-ceph-mds
NAME      READY   STATUS    RESTARTS   AGE
rook-ceph-mds-myfs-a-5bd6895d9-mbbm6    1/1 Running   0 7m21s
rook-ceph-mds-myfs-b-7d7b55684b-j5f5x   1/1 Running   0  7m4s

2.查看资源配置

[root@master ceph]# NAME=$(kubectl -n rook-ceph get pod -l "app=rook-ceph-tools" -o jsonpath='{.items[0].metadata.name}')
[root@master ceph]# kubectl -n rook-ceph exec -it ${NAME} sh
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
sh-4.2# ceph status
  cluster:
    id:     fb3cdbc2-8fea-4346-b752-131fd1eb2baf
    health: HEALTH_ERR
            1 filesystem is offline
            1 filesystem is online with fewer MDS than max_mds
            1/3 mons down, quorum a,b

  services:
    mon: 3 daemons, quorum  (age 2h), out of quorum: a, b, c
    mgr: a(active, since 136y)
    mds: myfs:0
    osd: 4 osds: 3 up (since 136y), 3 in (since 136y)

  data:
    pools:   2 pools, 64 pgs
    objects: 0 objects, 0 B
    usage:   3.0 GiB used, 21 GiB / 24 GiB avail
    pgs:     64 active+clean

sh-4.2# ceph osd lspools
1 myfs-metadata
2 myfs-data0
sh-4.2# ceph mds stat
myfs:1 {0=myfs-b=up:active} 1 up:standby-replay
sh-4.2# ceph fs ls
name: myfs, metadata pool: myfs-metadata, data pools: [myfs-data0 ]

3.创建相对应的storageclass

如果想使用CephFS,必须创建storageclass

[root@master ceph]# cd /tmp/rook/cluster/examples/kubernetes/ceph/csi/cephfs/
[root@master cephfs]# kubectl apply -f storageclass.yaml
storageclass.storage.k8s.io/csi-cephfs created

4.kubernetes-dashboard查看结果

5.cpch-cephFS测试
案例一:多容器共享同一个数据目录,部署多个私有仓库共享同一个数据目录进行测试

[root@master cephfs]# ls
kube-registry.yaml  pod.yaml  pvc.yaml  storageclass.yaml
[root@master cephfs]# docker pull registry:2   
2: Pulling from library/registry
0a6724ff3fcd: Pull complete 
d550a247d74f: Pull complete 
1a938458ca36: Pull complete 
acd758c36fc9: Pull complete 
9af6d68b484a: Pull complete 
Digest: sha256:d5459fcb27aecc752520df4b492b08358a1912fcdfa454f7d2101d4b09991daa
Status: Downloaded newer image for registry:2
docker.io/library/registry:2
[root@master cephfs]# kubectl create -f kube-registry.yaml
persistentvolumeclaim/cephfs-pvc created
deployment.apps/kube-registry created

6.创建数据验证共享性

创建数据验证共享性
在kube-system下创建了一个deployment作为私有仓库
将目录/var/lib/registry挂接到CephFS，并且是3个副本共享挂载的

[root@k8s-master01 cephfs]# kubectl get pod -n kube-system -l k8s-app=kube-registry -o wide
[root@k8s-master01 cephfs]# kubectl -n kube-system exec -it kube-registry-65df7d789d-9bwzn sh
sh-4.2# df -hP|grep '/var/lib/registry'
sh-4.2# cd /var/lib/registry
sh-4.2# touch abc
sh-4.2# exit
[root@k8s-master01 cephfs]# kubectl -n kube-system exec -it kube-registry-65df7d789d-sf55j 
sh-4.2# ls /var/lib/registry
sh-4.2# abc

二:kubenetes 部署 Prometheus 监控

1.下载 kube-prometheus

[root@master opt]# cd /opt
[root@master opt]# git clone https://github.com/coreos/kube-prometheus.git

2.过滤所需镜像

需要搂出来所有的镜像信息，使用阿里云镜像服务做中转加速，镜像信息简单搂取脚本如下：

[root@master kube-prometheus]# find . -name "*.yaml" -exec grep 'quay.io' {} \;|awk '{print $NF}'|sort|uniq
--prometheus-config-reloader=quay.io/prometheus-operator/prometheus-config-reloader:v0.44.1
quay.io/brancz/kube-rbac-proxy:v0.8.0
quay.io/coreos/kube-state-metrics:v1.9.7
quay.io/fabxc/prometheus_demo_service
quay.io/prometheus/alertmanager:v0.21.0
quay.io/prometheus/blackbox-exporter:v0.18.0
quay.io/prometheus/node-exporter:v1.0.1
quay.io/prometheus-operator/prometheus-operator:v0.44.1
quay.io/prometheus/prometheus:v2.22.1
[root@master kube-prometheus]# find . -name "*.yaml" -exec grep 'image: ' {} \;|awk '{print $NF}'|sort|uniq
}}
directxman12/k8s-prometheus-adapter:v0.8.2
gcr.io/google_containers/metrics-server-amd64:v0.2.0
grafana/grafana:7.3.5
jimmidyson/configmap-reload:v0.4.0
quay.io/brancz/kube-rbac-proxy:v0.8.0
quay.io/coreos/kube-state-metrics:v1.9.7
quay.io/fabxc/prometheus_demo_service
quay.io/prometheus/alertmanager:v0.21.0
quay.io/prometheus/blackbox-exporter:v0.18.0
quay.io/prometheus/node-exporter:v1.0.1
quay.io/prometheus-operator/prometheus-operator:v0.44.1
quay.io/prometheus/prometheus:v2.22.1

3.配置文件中替换为阿里镜像

[root@master kube-prometheus]# cat a.sh 
find . -name "*.yaml" -exec sed -i 's|gcr.io/google_containers/metrics-server-amd64:v0.2.0|registry.cn-hangzhou.aliyuncs.com/vinc-auto/metrics-server-amd64:v0.2.0|g' {} \;
find . -name "*.yaml" -exec sed -i 's|grafana/grafana:6.6.0|registry.cn-hangzhou.aliyuncs.com/vinc-auto/grafana:6.6.0|g' {} \;
find . -name "*.yaml" -exec sed -i 's|jimmidyson/configmap-reload:v0.3.0|registry.cn-hangzhou.aliyuncs.com/vinc-auto/configmap-reload:v0.3.0|g' {} \;
find . -name "*.yaml" -exec sed -i 's|luxas/autoscale-demo:v0.1.2|registry.cn-hangzhou.aliyuncs.com/vinc-auto/autoscale-demo:v0.1.2|g' {} \;
find . -name "*.yaml" -exec sed -i 's|quay.io/coreos/k8s-prometheus-adapter-amd64:v0.5.0|registry.cn-hangzhou.aliyuncs.com/vinc-auto/k8s-prometheus-adapter-amd64:v0.5.0|g' {} \;
find . -name "*.yaml" -exec sed -i 's|quay.io/coreos/kube-rbac-proxy:v0.4.1|registry.cn-hangzhou.aliyuncs.com/vinc-auto/kube-rbac-proxy:v0.4.1|g' {} \;
find . -name "*.yaml" -exec sed -i 's|quay.io/coreos/kube-state-metrics:v1.9.5|registry.cn-hangzhou.aliyuncs.com/vinc-auto/kube-state-metrics:v1.9.5|g' {} \;
find . -name "*.yaml" -exec sed -i 's|quay.io/coreos/prometheus-config-reloader:v0.38.0|registry.cn-hangzhou.aliyuncs.com/vinc-auto/prometheus-config-reloader:v0.38.0|g' {} \;
find . -name "*.yaml" -exec sed -i 's|quay.io/coreos/prometheus-operator:v0.38.0|registry.cn-hangzhou.aliyuncs.com/vinc-auto/prometheus-operator:v0.38.0|g' {} \;
find . -name "*.yaml" -exec sed -i 's|quay.io/fabxc/prometheus_demo_service|registry.cn-hangzhou.aliyuncs.com/vinc-auto/prometheus_demo_service:latest|g' {} \;
find . -name "*.yaml" -exec sed -i 's|quay.io/prometheus/alertmanager:v0.20.0|registry.cn-hangzhou.aliyuncs.com/vinc-auto/alertmanager:v0.20.0|g' {} \;
find . -name "*.yaml" -exec sed -i 's|quay.io/prometheus/node-exporter:v0.18.1|registry.cn-hangzhou.aliyuncs.com/vinc-auto/node-exporter:v0.18.1|g' {} \;
find . -name "*.yaml" -exec sed -i 's|quay.io/prometheus/prometheus:v2.15.2|registry.cn-hangzhou.aliyuncs.com/vinc-auto/prometheus:v2.15.2|g' {} \;
[root@master kube-prometheus]# bash a.sh

4.安装 prometheus-operator

[root@master kube-prometheus]# kubectl apply -f manifests/setup

5.安装 promethes metric adapter

[root@master kube-prometheus]# kubectl apply -f manifests/

6.查看运行状态

[root@master kube-prometheus]# kubectl get pods -n monitoring
[root@master kube-prometheus]# kubectl top pods -n monitoring

7.暴露 prometheus 服务

修改 ClusterIP 为 NodePort
[root@master kube-prometheus]# kubectl edit svc prometheus-k8s -n monitoring

8.浏览器访问测试 prometheus

9.暴露 grafana 服务

修改 ClusterIP 为 NodePort
[root@master kube-prometheus]# kubectl edit svc grafana -n monitoring

10.浏览器访问测试 grafana

用户名密码均为 admin