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使用Heketi作为Kubernetes的持久存储GlusterFS的external provisioner
已经通过Helm 部署的一个mysql2 实例,使用存储2G,信息查看如下:
# helm list
NAME REVISION UPDATED STATUS CHART NAMESPACE
mysql2 1 Thu Apr 12 15:27:11 2018 DEPLOYED mysql-0.3.7 default
查看PVC和PV,大小2G,mysql2-mysql
# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
mysql2-mysql Bound pvc-ea4ae3e0-3e22-11e8-8bb6-08002795cb26 2Gi RWO slow 19h
# kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
pvc-ea4ae3e0-3e22-11e8-8bb6-08002795cb26 2Gi RWO Delete Bound default/mysql2-mysql slow 19h
查看mysql的pod
# kubectl get pod|grep mysql2
mysql2-mysql-56d64f5b77-j2v84 1/1 Running 2 19h
进入mysql所在容器
# kubectl exec -it mysql2-mysql-56d64f5b77-j2v84 /bin/bash
查看挂载路径,查看挂载信息
[email protected]:/#cd /var/lib/mysql
[email protected]:/var/lib/mysql#
[email protected]:/var/lib/mysql# df -h
Filesystem Size Used Avail Use% Mounted on
none 48G 9.2G 37G 21% /
tmpfs 1.5G 0 1.5G 0% /dev
tmpfs 1.5G 0 1.5G 0% /sys/fs/cgroup
/dev/mapper/ubuntu--1--vg-root 48G 9.2G 37G 21% /etc/hosts
shm 64M 0 64M 0% /dev/shm
192.168.5.191:vol_2c2227ee65b64a0225aa9bce848a9925 2.0G 264M 1.8G 13% /var/lib/mysql
tmpfs 1.5G 12K 1.5G 1% /run/secrets/kubernetes.io/serviceaccount
tmpfs 1.5G 0 1.5G 0% /sys/firmware
使用dd写入数据,写入一段时间以后,空间满了,会报错(报错信息有bug,不是报空间满了,而是报文件系统只读,应该是glusterfs和docker配合的问题)
[email protected]:/var/lib/mysql# dd if=/dev/zero of=test.img bs=8M count=300
dd: error writing 'test.img': Read-only file system
dd: closing output file 'test.img': Input/output error
查看写满以后的文件大小
[email protected]:/var/lib/mysql# ls -l
total 2024662
-rw-r----- 1 mysql mysql 56 Apr 12 07:27 auto.cnf
-rw-r----- 1 mysql mysql 1329 Apr 12 07:27 ib_buffer_pool
-rw-r----- 1 mysql mysql 50331648 Apr 12 12:05 ib_logfile0
-rw-r----- 1 mysql mysql 50331648 Apr 12 07:27 ib_logfile1
-rw-r----- 1 mysql mysql 79691776 Apr 12 12:05 ibdata1
-rw-r----- 1 mysql mysql 12582912 Apr 12 12:05 ibtmp1
drwxr-s--- 2 mysql mysql 8192 Apr 12 07:27 mysql
drwxr-s--- 2 mysql mysql 8192 Apr 12 07:27 performance_schema
drwxr-s--- 2 mysql mysql 8192 Apr 12 07:27 sys
-rw-r--r-- 1 root mysql 1880887296 Apr 13 02:47 test.img
查看挂载信息(挂载信息显示bug,应该是glusterfs的bug)
[email protected]:/var/lib/mysql# df -h
Filesystem Size Used Avail Use% Mounted on
none 48G 9.2G 37G 21% /
tmpfs 1.5G 0 1.5G 0% /dev
tmpfs 1.5G 0 1.5G 0% /sys/fs/cgroup
/dev/mapper/ubuntu--1--vg-root 48G 9.2G 37G 21% /etc/hosts
shm 64M 0 64M 0% /dev/shm
192.168.5.191:vol_2c2227ee65b64a0225aa9bce848a9925 2.0G -16E 0 100% /var/lib/mysql
tmpfs 1.5G 12K 1.5G 1% /run/secrets/kubernetes.io/serviceaccount
tmpfs 1.5G 0 1.5G 0% /sys/firmware
查看文件夹大小,为2G
# du -h
25M ./mysql
825K ./performance_schema
496K ./sys
2.0G .
如上说明glusterfs的限额作用是起效的,限制在2G的空间大小。