Amazon Linux Cannot allocate memory

今天在编译HHVM的时候 Virtual memory exhausted: Cannot allocate memory，而这我重新启动Nginx的时候，也提示内容错误。后来一查发现是Memory不够的原因,创建instance的时候没选好？。

以及Nginx启动出错

2014/09/21 12:11:04 [alert] 1656#0: mmap(MAP_ANON|MAP_SHARED, 1048576000) failed (12: Cannot allocate memory)
2014/09/21 12:11:09 [alert] 1690#0: mmap(MAP_ANON|MAP_SHARED, 1048576000) failed (12: Cannot allocate memory)
2014/09/21 12:11:33 [alert] 1739#0: mmap(MAP_ANON|MAP_SHARED, 1048576000) failed (12: Cannot allocate memory)
2014/09/21 12:14:19 [alert] 1878#0: mmap(MAP_ANON|MAP_SHARED, 1048576000) failed (12: Cannot allocate memory)

Amazon添加swap到EC2 instance?

大致分三步进行

1.创建swapfile文件

下面的代码是创建一个1G的swapfile，如果想要512，将bs将为1024

sudo dd if=/dev/zero of=/swapfile bs=2048 count=524288

.

524288+0 records in
524288+0 records out
1073741824 bytes (1.1 GB) copied, 16.3176 s, 65.8 MB/s

查看是否创建成功

ls -lh /swapfile

.

-rw-r--r-- 1 root root 1.0G Sep 22 13:22 /swapfile

2.设置交换区

sudo mkswap /swapfile

.

Setting up swapspace version 1, size = 1048572 KiB
no label, UUID=14c49315-c69b-4269-a2fe-4716e81ece9e

3.启动系统交换区

sudo swapon /swapfile

4.添加到分区表中(可选)

vim /etc/fstab

.

/dev/xvda2      /mnt    auto    defaults,nobootwait,comment=cloudconfig 0   2
/swapfile swap swap defaults 0 0