"lack of free swap space"告警处理，自动挂载swap

[root@zabbix ~]# free -h
              total        used        free      shared  buff/cache   available
Mem:           991M        636M        199M         47M        155M        174M
Swap:            0B          0B          0B

[root@zabbix ~]# dd if=/dev/zero of=/tmp/vmfile bs=2M count=1024
1024+0 records in
1024+0 records out
2147483648 bytes (2.1 GB) copied, 39.5264 s, 54.3 MB/s