longhorn安装与使用

一、longhorn介绍

1.1 配置介绍

longhorn默认存储目录是/var/lib/longhorn，使用yaml文件安装的也是在节点的这个目录下

二、安装

2.1 k8s方式安装longhorn

longhorn会创建自己命名空间和存储类

2.1.1 节点安装依赖

每个节点都需要安装iscsi-initiator-utils，ubuntu需要安装open-iscsi
yum -y install iscsi-initiator-utils

2.1.2 安装

（1）下载longhorn.yaml文件

可以指定版本下载。也可以直接安装，这里下载是为了修改配置
#kubectl apply -f https://raw.githubusercontent.com/longhorn/longhorn/v1.1.0/deploy/longhorn.yaml
wget https://raw.githubusercontent.com/longhorn/longhorn/v1.1.0/deploy/longhorn.yaml

（2）修改配置

1. 修改pv保留策略

修改pv为保留策略，否则删除pvc的时候pv就会被删除
#找到文件中的StorageClass.data.reclaimPolicy字段,修改为Retain
reclaimPolicy: Retain

2. 修改longhorn-frontend端口，便于访问

修改longhorn-frontend端口
#类型也需要修改为NodePort
type: NodePort
#找到longhorn-frontend的nodePort字段
nodePort: 30179

3. 修改存储路径

#找到DaemonSet资源下的spec.template.containers.volumeMounts字段
将/var/lib/longhorn/修改为想要变更的存储路径，记得需要把文件中的所有/var/lib/longhorn/这个路径替换为变更的存储路径

（3）部署

1. 部署

[[email protected] volumes]# kubectl apply -f longhorn.yaml 
namespace/longhorn-system created
serviceaccount/longhorn-service-account created
clusterrole.rbac.authorization.k8s.io/longhorn-role created
clusterrolebinding.rbac.authorization.k8s.io/longhorn-bind created
customresourcedefinition.apiextensions.k8s.io/engines.longhorn.io created
customresourcedefinition.apiextensions.k8s.io/replicas.longhorn.io created
customresourcedefinition.apiextensions.k8s.io/settings.longhorn.io created
customresourcedefinition.apiextensions.k8s.io/volumes.longhorn.io created
customresourcedefinition.apiextensions.k8s.io/engineimages.longhorn.io created
customresourcedefinition.apiextensions.k8s.io/nodes.longhorn.io created
customresourcedefinition.apiextensions.k8s.io/instancemanagers.longhorn.io created
customresourcedefinition.apiextensions.k8s.io/sharemanagers.longhorn.io created
configmap/longhorn-default-setting created
podsecuritypolicy.policy/longhorn-psp created
role.rbac.authorization.k8s.io/longhorn-psp-role created
rolebinding.rbac.authorization.k8s.io/longhorn-psp-binding created
configmap/longhorn-storageclass created
daemonset.apps/longhorn-manager created
service/longhorn-backend created
deployment.apps/longhorn-ui created
service/longhorn-frontend created
deployment.apps/longhorn-driver-deployer created

2. 查看部署结果

[[email protected] volumes]# kubectl get ns
NAME              STATUS   AGE
default           Active   105d
dev               Active   10d
kube-node-lease   Active   105d
kube-public       Active   105d
kube-system       Active   105d
longhorn-system   Active   3m8s

[[email protected] volumes]# kubectl get pod -n longhorn-system
NAME                                       READY   STATUS    RESTARTS   AGE
csi-attacher-5dcdcd5984-cvk6k              1/1     Running   0          2m38s
csi-attacher-5dcdcd5984-fp8q4              1/1     Running   0          2m38s
csi-attacher-5dcdcd5984-kjjg9              1/1     Running   0          2m38s
csi-provisioner-5c9dfb6446-df4qw           1/1     Running   0          2m38s
csi-provisioner-5c9dfb6446-dhjhn           1/1     Running   0          2m38s
csi-provisioner-5c9dfb6446-szcml           1/1     Running   0          2m38s
csi-resizer-54d484bf8-ggjxg                1/1     Running   0          2m38s
csi-resizer-54d484bf8-jg9p9                1/1     Running   0          2m38s
csi-resizer-54d484bf8-k74gp                1/1     Running   0          2m38s
csi-snapshotter-96bfff7c9-555kp            1/1     Running   0          2m37s
csi-snapshotter-96bfff7c9-dcc96            1/1     Running   0          2m37s
csi-snapshotter-96bfff7c9-pd8hb            1/1     Running   0          2m37s
engine-image-ei-cf743f9c-fkgx8             1/1     Running   0          3m2s
engine-image-ei-cf743f9c-rtgml             1/1     Running   0          3m2s
engine-image-ei-cf743f9c-zhdtv             1/1     Running   0          3m2s
instance-manager-e-206640f3                1/1     Running   0          2m58s
instance-manager-e-d25b6c2c                1/1     Running   0          2m54s
instance-manager-e-e04840b1                1/1     Running   0          3m1s
instance-manager-r-2e491629                1/1     Running   0          3m1s
instance-manager-r-384e572d                1/1     Running   0          2m57s
instance-manager-r-70cc0617                1/1     Running   0          2m53s
longhorn-csi-plugin-bb2bw                  2/2     Running   0          2m37s
longhorn-csi-plugin-mmchb                  2/2     Running   0          2m37s
longhorn-csi-plugin-vrpq6                  2/2     Running   0          2m37s
longhorn-driver-deployer-cdb7464c6-cwt98   1/1     Running   0          3m17s
longhorn-manager-52gn6                     1/1     Running   2          3m18s
longhorn-manager-597xc                     1/1     Running   2          3m18s
longhorn-manager-zltr8                     1/1     Running   1          3m18s
longhorn-ui-849c455d79-x9265               1/1     Running   0          3m17s

查看存储类
[[email protected] volumes]# kubectl get sc
NAME       PROVISIONER          RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
longhorn   driver.longhorn.io   Retain          Immediate           true                   3m44s

2.2.3 web访问

直接访问集群中任何一个节点加端口就可以了
http://192.168.8.10:30179/#/dashboard
可以手动创建pv，部署好这个服务之后，之后在longhorn存储类中创建的pvc如果没有匹配的pv，都会自动创建pv，与pvc想匹配的。所以不需要咱们手动创建