一般情况下，使用zabbix镜像直接导入使用时，随着监控项越来越多，mysql目录空间会出现不足的情况，在zabbix页面有如下提示：
查看系统分区，可知/var/lib/mysql分区只有5G不到，急需扩容
如下为测试扩容步骤：
1.停止zabbix和mysql服务，卸载分区
[root@appliance ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 2.0G 0 2.0G 0% /dev/shm
tmpfs 2.0G 17M 1.9G 1% /run
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
/dev/sda2 4.0G 1.2G 2.9G 29% /
/dev/sda1 488M 50M 403M 11% /boot
/dev/sda5 4.5G 1.6G 3.0G 36% /var/lib/mysql
/dev/sda3 1014M 40M 975M 4% /tmp
tmpfs 393M 0 393M 0% /run/user/0
[root@appliance ~]# systemctl stop zabbix-server
[root@appliance ~]# systemctl stop mysqld
[root@appliance ~]# umount /var/lib/mysql2.删除并重新创建分区
（注意新创建分区起始编号要和原来的分区一致且不要删除原数据）
#删除4-5分区，重新创建4-5分区
[root@appliance ~]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.32.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): p
Disk /dev/sda: 30 GiB, 32212254720 bytes, 62914560 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xa1aaed50
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 1050623 1048576 512M 83 Linux
/dev/sda2 1050624 9439231 8388608 4G 83 Linux
/dev/sda3 9439232 11536383 2097152 1G 83 Linux
/dev/sda4 11536384 20971519 9435136 4.5G 5 Extended
/dev/sda5 11538432 20971519 9433088 4.5G 83 Linux
Command (m for help): d
Partition number (1-5, default 5): 5
Partition 5 has been deleted.
Command (m for help): d
Partition number (1-4, default 4): 4
Partition 4 has been deleted.
Command (m for help): n
Partition type
p primary (3 primary, 0 extended, 1 free)
e extended (container for logical partitions)
Select (default e): e
Selected partition 4
First sector (11536384-62914559, default 11536384):
Last sector, +sectors or +size{K,M,G,T,P} (11536384-62914559, default 62914559): +10G
Created a new partition 4 of type 'Extended' and of size 10 GiB.
Command (m for help): n
All primary partitions are in use.
Adding logical partition 5
First sector (11538432-32507903, default 11538432):
Last sector, +sectors or +size{K,M,G,T,P} (11538432-32507903, default 32507903): +9G
Created a new partition 5 of type 'Linux' and of size 9 GiB.
Partition #5 contains a xfs signature.
Do you want to remove the signature? [Y]es/[N]o: N
Command (m for help): p
Disk /dev/sda: 30 GiB, 32212254720 bytes, 62914560 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xa1aaed50
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 1050623 1048576 512M 83 Linux
/dev/sda2 1050624 9439231 8388608 4G 83 Linux
/dev/sda3 9439232 11536383 2097152 1G 83 Linux
/dev/sda4 11536384 32507903 20971520 10G 5 Extended
/dev/sda5 11538432 30412799 18874368 9G 83 Linux
Command (m for help): wq
The partition table has been altered.
Failed to update system information about partition 4: Device or resource busy
The kernel still uses the old partitions. The new table will be used at the next reboot.
Syncing disks.
[root@appliance ~]# fdisk -l
Disk /dev/sda: 30 GiB, 32212254720 bytes, 62914560 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xa1aaed50
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 1050623 1048576 512M 83 Linux
/dev/sda2 1050624 9439231 8388608 4G 83 Linux
/dev/sda3 9439232 11536383 2097152 1G 83 Linux
/dev/sda4 11536384 32507903 20971520 10G 5 Extended
/dev/sda5 11538432 30412799 18874368 9G 83 Linux3.重启（下一步失败时可先重启）
[root@appliance ~]# reboot4.扩大文件系统分区
[root@appliance ~]# xfs_growfs /dev/sda5
meta-data=/dev/sda5 isize=512 agcount=4, agsize=294784 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=1, rmapbt=0
= reflink=1 bigtime=0 inobtcount=0
data = bsize=4096 blocks=1179136, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0, ftype=1
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 1179136 to 2359296
[root@appliance ~]#
5.挂载目录
#手动挂载目录，或者重启下会自动挂载
[root@appliance ~]# umount /dev/sda5 /var/lib/mysql
[root@appliance ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 1.9G 0 1.9G 0% /dev
tmpfs 2.0G 0 2.0G 0% /dev/shm
tmpfs 2.0G 17M 1.9G 1% /run
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
/dev/sda2 4.0G 1.2G 2.9G 29% /
/dev/sda1 488M 50M 403M 11% /boot
/dev/sda5 9.0G 1.7G 7.4G 19% /var/lib/mysql
/dev/sda3 1014M 40M 975M 4% /tmp
tmpfs 393M 0 393M 0% /run/user/0
[root@appliance ~]#5.最后别忘了重新启用mysql和zabbix服务
[root@appliance ~]# systemctl start mysqld
[root@appliance ~]# systemctl start zabbix-server
