swap 分区扩容

文件扩容

扩容前

[root@bm-test-mysql-master ~]# free -mh
              total        used        free      shared  buff/cache   available
Mem:           3.7G        3.4G        139M        1.8M        151M         96M
Swap:          3.9G        923M        3.0G

[root@bm-test-mysql-master ~]# swapon  -s
Filename                                Type            Size    Used    Priority
/dev/dm-1                               partition       4063228 946120  -2

扩容

[root@bm-test-mysql-master ~]# dd if=/dev/zero of=/mnt/swap bs=1M count=8192
8192+0 records in
8192+0 records out
8589934592 bytes (8.6 GB) copied, 108.998 s, 78.8 MB/s

[root@bm-test-mysql-master ~]# mkswap /mnt/swap
Setting up swapspace version 1, size = 8191996 KiB
no label, UUID=2098e338-ba6f-458b-950e-2f2db08f87ad

[root@bm-test-mysql-master ~]# swapon /mnt/swap
swapon: /mnt/swap: insecure permissions 0644, 0600 suggested.

[root@bm-test-mysql-master ~]# chmod 0600  /mnt/swap

[root@bm-test-mysql-master ~]# free -hm
              total        used        free      shared  buff/cache   available
Mem:           3.7G        2.5G        204M        1.9M        989M        962M
Swap:           11G        1.7G          9G