[Linux] Ubuntu increases the size of the swap area

Cause: The swap area is too small and the system freezes.
Solution: Increase the size of the swap area

1. Solution

1. Check the size of the swap area:
free -m
2. Enter the root user (very important, it will be troublesome not to continue)

sudo su - root 

3. Create a directory:

mkdir /swap

4. Enter the catalog

cd /swqp

5. Enter the following command:

dd if=/dev/zero of=swapfile bs=1024 count=10290000

			a.可以看到如下内容:
   					记录了1029000+0 的读入
   					记录了1029000+0 的写出
  					 1053696000字节(1.1 GB)已复制，69.0168 秒，15.3 MB/秒
			b.可以用 < ls -lh > 可以看到一个文件。
  					 -rw-r--r-- 1 root root 1005M 2010-01-02 14:35 swapfile

6. Configuration

mkswap swapfile

7. Mount the swap area:

swapon swapfile

8. Check the size of the swap area

free -m

Possible errors

1. Insecure permissions 0644, 0600 is recommended (modify permissions)

chmod 0600 /swap/swapfile   

2. The device or resource is busy (activate the swap file)

swapoff /swap/swapfile
swapon /swap/swapfile

3. The swap area restores to the default after booting

命令：sudo vim /etc/fstab
添加： /swap/swapfile /swap swap defaults 0 0
保存：:wq