hostpath宿主机文件系统
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卷通过将宿主机文件系统上的路径挂载到 Pod 中，使得 Pod 内的容器可以访问该路径
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可以实现在宿主节点和 Pod 之间共享数据
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可以实现pod访问宿主机上特定的日志文件或数据目录
1.创建一个pod，然后在 pod调度到的节点创建目录：/hostpath-test
bash
[root@master23107-volumes]# cat 02-hostpath.yaml
apiVersion: v1
kind: Pod
metadata:
name: hostpath-pod
spec:
containers:
- name: nginx
image: registry.cn-hangzhou.aliyuncs.com/yinzhengjie-k8s/apps:v1
volumeMounts:
- mountPath: /data
name: hostpath-volume
volumes:
- name: hostpath-volume
hostPath:
path: /hostpath-test
type: Directory2.进入pod写入数据，然后删除pod。
/ # touch /data/hostpath-test.txt
3.查看worker233节点数据被保留了
bash
[root@worker233~]# ls /hostpath-test/
hostpath-test.txt使用NFS作为volumes
nfs跨节点不同pod共享
bash
1.K8S各节点部署nfs工具
[root@master231 ~]# apt -y install nfs-kernel-server
[root@worker232 ~]# apt -y install nfs-kernel-server
[root@worker233 ~]# apt -y install nfs-kernel-server
2.配置nfs服务端
[root@master231 ~]# mkdir -pv /oldboyedu/data/nfs-server
mkdir: created directory '/oldboyedu/data'
mkdir: created directory '/oldboyedu/data/nfs-server'
[root@master231 ~]#
[root@master231 ~]# tail -1 /etc/exports
/oldboyedu/data/nfs-server *(rw,no_root_squash)
[root@master231 ~]#
[root@master231 ~]# systemctl restart nfs-server
[root@master231 ~]#
[root@master231 ~]# exportfs
/oldboyedu/data/nfs-server
<world>
[root@master231 ~]#
3.编写资源清单
[root@master231 pods]# cat 09-pods-volumes-nfs.yaml
apiVersion: v1
kind: pod
metadata:
name: xiuxian-nfs-001
spec:
nodeName: worker232
volumes:
- name: data
# 配置后端存储是nfs
nfs:
# 指定nfs server的地址，可以是主机名，前提是hosts文件有解析。
server: master231
# 指定nfs的共享目录
path: /oldboyedu/data/nfs-server
containers:
- image: harbor.oldboyedu.com/oldboyedu-web/xiuxian:v2
name: xiuxian
volumeMounts:
- name: data
mountPath: /xixi
---
apiVersion: v1
kind: pod
metadata:
name: xiuxian-nfs-002
spec:
nodeName: worker233
volumes:
- name: data
nfs:
server: master231
path: /oldboyedu/data/nfs-server
containers:
- image: harbor.oldboyedu.com/oldboyedu-linux/alpine:3.20.2
name: alpine
stdin: true
volumeMounts:
- name: data
mountPath: /haha
[root@master231 pods]#
4.测试验证
[root@master231rc]# kubectl exec -it xiuxian-nfs-001 -- sh
/ # ls /xixi/
/ # touch /xixi/nfs-0010-xixi.txt
/ #
[root@master231k8s-config]# kubectl exec -it xiuxian-nfs-002 -- sh
/ # ls /haha/
nfs-0010-xixi.txt
/ #
[root@master231k8s-config]# ls /oldboyedu/data/nfs-server/
nfs-0010-xixi.txtnfs持久存储mysql
bash
0.创建nfs的存储目录
[root@master231 ~]# mkdir -pv /zhiyong18/data/nfs-server/mysql80/
mkdir: created directory '/zhiyong18/data/nfs-server/mysql80/'
[root@master231 ~]#
[root@master231 ~]# chmod +777 /zhiyong18/data/nfs-server/mysql80/
[root@master231 ~]#
1.编写资源清单
[root@master231 pods]# cat 10-pods-volume-nfs-env-mysql.yaml
apiVersion: v1
kind: pod
metadata:
name: mysql-002
labels:
apps: mysql80
spec:
nodeName: worker232
volumes:
- name: db
nfs:
server: 10.0.0.231
path: /zhiyong18/data/nfs-server/mysql80
containers:
- image: harbor.zhiyong18.com/zhiyong18-db/mysql:8.3.0-oracle
name: mysql
env:
- name: MYSQL_ROOT_PASSWORD
value: zhiyong18
- name: MYSQL_DATABASE
value: wordpress
- name: MYSQL_USER
value: zhiyong
- name: MYSQL_PASSWORD
value: "123"
volumeMounts:
- name: db
mountPath: /var/lib/mysql
[root@master231 pods]#
[root@master231 pods]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
mysql-002 1/1 Running 1 (26s ago) 42s 10.100.1.39 worker232 <none> <none>
[root@master231 pods]#
[root@master231 pods]# kubectl exec mysql-002 -- env
...
MYSQL_ROOT_PASSWORD=zhiyong18
MYSQL_DATABASE=wordpress
MYSQL_USER=zhiyong
MYSQL_PASSWORD=123
...
[root@master231 pods]#
2.测试数据验证
[root@master231 pods]# kubectl exec -it mysql-002 -- mysql -pzhiyong18
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 8.3.0 MySQL Community Server - GPL
Copyright (c) 2000, 2024, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| wordpress |
+--------------------+
5 rows in set (0.00 sec)
mysql>
mysql>
mysql> SELECT user,host FROM mysql.user;
+------------------+-----------+
| user | host |
+------------------+-----------+
| zhiyong | % |
| root | % |
| mysql.infoschema | localhost |
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
+------------------+-----------+
6 rows in set (0.00 sec)
mysql>
mysql>
mysql> use wordpress;
Database changed
mysql>
mysql> SHOW TABLES;
Empty set (0.00 sec)
mysql>
mysql>
mysql> CREATE TABLE student(id INT PRIMARY KEY AUTO_INCREMENT,name VARCHAR(255) NOT NULL,hobby VARCHAR(255) NOT NULL);
Query OK, 0 rows affected (0.03 sec)
mysql>
mysql>
mysql> DESC student;
+-------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------+--------------+------+-----+---------+----------------+
| id | int | NO | PRI | NULL | auto_increment |
| name | varchar(255) | NO | | NULL | |
| hobby | varchar(255) | NO | | NULL | |
+-------+--------------+------+-----+---------+----------------+
3 rows in set (0.00 sec)
mysql> INSERT INTO student(name,hobby) VALUE ('HanWenTong','Sleep 10');
Query OK, 1 row affected (0.01 sec)
mysql>
mysql> SELECT * FROM student;
+----+------------+----------+
| id | name | hobby |
+----+------------+----------+
| 1 | HanWenTong | Sleep 10 |
+----+------------+----------+
1 row in set (0.00 sec)
mysql>
3.删除pod调度到另外一个worker节点
[root@master231 pods]# vim 10-pods-volume-nfs-env-mysql.yaml
[root@master231 pods]#
[root@master231 pods]# kubectl apply -f 10-pods-volume-nfs-env-mysql.yaml
pod/mysql-002 created
[root@master231 pods]#
[root@master231 pods]#
[root@master231 pods]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
mysql-002 1/1 Running 0 7s 10.100.2.9 worker233 <none> <none>
[root@master231 pods]#
[root@master231 pods]# kubectl exec -it mysql-002 -- mysql -pzhiyong18
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 8.3.0 MySQL Community Server - GPL
Copyright (c) 2000, 2024, Oracle and/or its affiliates.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| wordpress |
+--------------------+
5 rows in set (0.00 sec)
mysql> SHOW TABLES FROM wordpress;
+---------------------+
| Tables_in_wordpress |
+---------------------+
| student |
+---------------------+
1 row in set (0.00 sec)
mysql>
mysql> SELECT * FROM wordpress.student;
+----+------------+----------+
| id | name | hobby |
+----+------------+----------+
| 1 | HanWenTong | Sleep 10 |
+----+------------+----------+
1 row in set (0.00 sec)
mysql>